RADCON TECHNICIAN TRAINING

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RADCON TECHNICIAN TRAINING

• Welcome-You may click the left mouse button or
  use the Enter key to advance.

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Foreign Material Exclusion
Computer Based Training
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About This Course

• You may use the P key to go to the previous
  screen.

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About This Course

• This Computer Based learning activity has been
  developed from the material in the lesson plan on
  Foreign Material Exclusion (HPT001.113).

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Foreign Material Exclusion OBJECTIVES

• Terminal Objective
• Upon completion of this lesson the student will
  demonstrate satisfactory knowledge of the TVAN
  Foreign Material Control Program by scoring at
  least 80 on an examination. SPP-6.5 is allowed
  as reference material for the exam.

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Foreign Material Exclusion OBJECTIVES

• The examination for this CBT will be provided on
  the computer.
• A proctor must allow you access to the
  examination.
• The software will score each question as you
  answer it.

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Foreign Material ExclusionOBJECTIVES

• Enabling Objectives
• 1. Define terms outlined in the FME procedure
  and this course.
• 2. State the purpose of Foreign Material
  Exclusion.
• 3. Identify responsibilities of various
  personnel for work preparation through job
  closure to include recovery from loss of FME
  controls.
• 4. Identify the most common causes of Foreign
  Material Intrusion (FMI).
• 5. Identify potential radiological hazards and
  other concerns resulting from FMI or loss of FME
  controls
• 6. Identify FME requirements for special
  activities and specific areas.
• 7. Identify points from industry events
  concerning FME, including SOER 95-1.
• 8. Correlate error prevention tools used to
  prevent foreign material intrusion.

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Foreign Material Exclusion REFERENCES

• A. SPP-6.5, Foreign Material Control, Revision 7,
  effective date 07/11/2003.
• B. HPT001.113, Foreign Material Exclusion, RADCON
  Technician Training Program, Revision 0.
• C. INPO SOER 95-1, Reducing Events Resulting from
  Foreign Material Intrusion.
• D. BFN PERs
• E. NRC Inspection Report No. 50-390/97-11

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Foreign Material Exclusion Training Materials
and Aids

• Access and/or print the following documents you
  will need for the course by clicking on the icon
• SPP 6.5, Foreign Material Control, latest
  revision.
• Student Notebook

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Foreign Material ExclusionIntroduction

• Foreign material introduced into plant
  systems can cause equipment degradation,
  inoperability of components, or even fuel damage
  which may lead to higher radiation and
  contamination levels.

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Foreign Material ExclusionIntroduction

• Intrusion of foreign material into primary
  systems can also create activated products which
  cause more radiation dose to personnel.

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TVAN has had its share of FME events. Just a few
are included here.
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Foreign Material ExclusionIntroduction - BFN
Events

• 1998 - A hose was floating in the Unit 3 spent
  fuel storage pool. The hose broke and part fell
  to the bottom of the pool.
• 1998 - Foreign material was found in steam trap
  2-TRP-073-005 at BFN and appeared to be welding
  slag and grinding dust. The trap had been
  replaced during U2C9 outage.

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Foreign Material ExclusionIntroduction - BFN
Events

• 1997 - Clear cellophane wrap was used to support
  RADCON activities on the refuel floor. This is
  contrary to FME control requirements.
• 1995 - Plastic type material was wrapped around
  the lower suction portion of the BFN 3A core
  spray pump impeller.

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Foreign Material ExclusionIntroduction

• Significant industry events continue to occur due
  to inadequate control of Foreign Material.

• INPO SOER 95-1 provides insights into the most
  prevalent causes of foreign material intrusion
  events and identifies some effective industry
  practices for preventing foreign material
  intrusion.

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Foreign Material ExclusionIntroduction

• Several other events and SOER 95-1 concerning
  foreign material intrusion will be reviewed later
  in this course.

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Foreign Material ExclusionIntroduction

• For these reasons, nuclear plants have a Foreign
  Material Control program in place.

FME Control Program
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Foreign Material ExclusionIntroduction

• SPP 6.5, Foreign Material Controls, provides
  requirements for maintaining nuclear plant
  cleanliness by preventing the uncontrolled
  introduction of foreign material such as
  maintenance residue, dirt, debris, or tools into
  open systems or components, and recovery from
  intrusion of foreign material.

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Foreign Material Exclusion

• SPP-6.5, Foreign Material Control, emphasizes an
  attitude of
• focus on prevention .

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Foreign Material ExclusionIntroduction

• In addition to programs and procedural direction,
  our work practices and habits have a great impact
  on the end result of all that we do.

The success of TVANs FMI Program depends on YOU!
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Foreign Material ExclusionProcedure

• SPP 6.5 requirements apply to all maintenance,
  modification, operations and testing activities
  which involve open systems or components.

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Foreign Material ExclusionProcedure

• The methods used to control foreign materials
  within areas will depend on the configuration and
  safety significance of the system, the activity
  being performed, and the probability of foreign
  material intrusion.

Procedure Adherence is an error prevention tool!!!
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Foreign Material ExclusionProcedure

• Several activities such as valve packing and pump
  repacking are NOT considered as opening of a
  component or system.
• Also, some activities are exempt from the FME
  requirements under certain conditions.
• Review SPP 6.5, Section 2.0 for more examples of
  the above.

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Foreign Material Exclusion TERMS AND DEFINITIONS

• The following definitions from SPP 6.5 are
  important and are found in Section 5.0

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Foreign Material Exclusion TERMS AND DEFINITIONS

• Foreign Material Exclusion - Preventing the
  inadvertent introduction of foreign material,
  such as dirt, debris, maintenance residue, tools
  and equipment into open plant systems or
  components.

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Foreign Material Exclusion TERMS AND DEFINITIONS

• FME Area - A work area where specific controls
  are implemented to prevent the introduction of
  foreign material into systems or components
  during the performance of maintenance,
  modifications, test or inspection activities.

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Foreign Material Exclusion TERMS AND DEFINITIONS

• Maintenance Residue - Any by-product of a
  maintenance activity, such as chemical deposits
  from solvents, particles and filings from
  cutting, grinding or lapping dust, wood chips
  from scaffolding, tape adhesive, and welding or
  soldering residue.

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Foreign Material Exclusion TERMS AND DEFINITIONS

• Source Term - The quantity of radioactive
  materials (corrosion products and fission
  products) contained in the Reactor Coolant System
  (RCS).

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Foreign Material Exclusion TERMS AND DEFINITIONS

• Fail-Safe - Describes an item which is too large
  to fit through the sensitive openings in systems,
  components, or equipment.

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Foreign Material Exclusion TERMS AND DEFINITIONS

• Fail Safe (cont.) - Component parts of the item
  must be secured to prevent loss and the item must
  be easily retrieved from the system or component.

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Foreign Material Exclusion TERMS AND DEFINITIONS

• Fail Safe (cont.) - During refueling activities,
  in the area of open pools of water, an item may
  be considered fail-safe if the configuration of
  the item makes it readily retrievable, even
  though it is small enough to fit through
  available system openings.

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Foreign Material Exclusion TERMS AND DEFINITIONS

• Qualified FME Monitor (FMEM) - A person who has
  had training concerning FME procedures and
  controls, duties of FMEM, and actions to be taken
  should loss or suspected loss of FME control
  occur.

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Foreign Material Exclusion TERMS AND DEFINITIONS

• The FMEM must be knowledgeable of
• FME requirements,
• use of accountability logs,
• their responsibility to remain at or near the
  entrance to FME control area,
• the logging in and out of items and/or personnel,
  
• and verification (accountability) for all items
  before closure or removal of boundaries/barriers.

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Foreign Material Exclusion TERMS AND DEFINITIONS

• FME Accountability Log - A chronological listing
  used to account for items and personnel that
  enter and exit FMEAs.

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Foreign Material Exclusion TERMS AND DEFINITIONS

• Temporary Cover - A method to cover and protect a
  system or component from the introduction of
  foreign material when the system or component is
  left unattended.
• SPP 6.5 has several specific requirements for
  temporary covers.

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Foreign Material Exclusion TERMS AND DEFINITIONS

• Lanyard - A line, rope or cord used to secure or
  restrict an object from movement or loss.
  Lanyards should be made of nylon or corrosion
  resistant steel wire. The shortest length should
  be such that it minimizes dropping distance and
  limits the object from hitting and damaging
  surrounding equipment.
• In no case shall a personnel hazard be caused to
  exist by the use of lanyards!

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Foreign Material Exclusion TERMS AND DEFINITIONS

• Non-fail-Safe - Describes an item which could be
  introduced into sensitive openings of systems or
  components.

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Foreign Material Exclusion TERMS AND DEFINITIONS

• Non-fail-Safe (cont.)- This introduction could
  occur by the item itself falling into or part of
  the item falling into the openings.
• Can you think of a Non-fail-safe item where part
  of the item could fall into openings???

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Foreign Material Exclusion TERMS AND DEFINITIONS

• For example a lens holder comes off a
  flashlight, allowing batteries, lens and holder
  to fall into an open system or component.
• This type of item is considered nonfail-safe, and
  shall require additional methods, such as
  lanyards, taping, and bagging to prevent loss.

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Foreign Material ExclusionWork Steps
Work Planning
Work Preparation
Work Performance
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Work Planning
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Foreign Material Exclusion Work Planning

• A FME evaluation for controls should be performed
  whenever a system or component is to be opened.
  This evaluation is typically performed by the
  work planner.
• For standard, recurrent activities in which FME
  is required, a mandatory FME list and standing
  instructions concerning FME controls
  (requirements) should be developed.
• An example is SPP 6.5, Appendix F, BFN Spent Fuel
  Pool, Vessel Cavity, and Equipment Pit - Level 3
• Appendices B - G contain other BFN requirements.

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Foreign Material Exclusion Work Planning

• More stringent FME requirements may be mandated
  for any work activity than is listed in the
  Appendices of the SPP.
• Especially important for work on valves which
  have stellite hard-facings and where particles
  could come in contact with reactor coolant.

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Foreign Material Exclusion Work Planning

• Less stringent controls must be approved by the
  FME Program Coordinator or designee.

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Work Preparation
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Foreign Material Exclusion Work Preparation

• Work Supervisor Responsibilities
• Brief the work crew(s)
• Assign qualified FME monitor
• Define FME area boundaries to be established
• Worker Responsibilities
• Establish boundaries and markers
• Remove nonessential material from the
  FMEA/adjacent areas
• Clean the FMEA (including overhead and
  components) of dirt and debris
• Erect a clean enclosure or barrier around the
  FMEA
• Make all items fail-safe
• Remove unsecured personal items (jewelry, wallet,
  coins, etc.)

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Foreign Material Exclusion Work Preparation

• FME areas must be bounded and marked.

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Foreign Material Exclusion Work Preparation
FOREIGN MATERIAL EXCLUSION AREA AUTHORIZED
PERSONNEL ONLY

• The STOP sign and these FMEA boundary postings
  (or similar ones) are used.

FOREIGN MATERIAL EXCLUSION AREA AUTHORIZED
PERSONNEL ONLY FME MONITOR APPROVAL REQUIRED BEFOR
E ENTRY
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Foreign Material Exclusion Work Preparation

• FME Monitor Responsibilities
• Perform and document an initial inventory of all
  non-permanent items that are not fail-safe within
  the FMEA using an approved FME Accountability
  Log.
• Concurrence must be obtained from the job
  supervisor.

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Work Performance
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Foreign Material Exclusion Work Performance

• Work Supervisor Responsibilities
• Ensure work preparation steps are complete
• Authorize system or component opening
• Monitor work area
• Ensure logs are reconciled and approved
• Ensure FMEA cleanliness
• Designate an individual to witness closure of the
  system

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Foreign Material Exclusion Work Performance

• FME Monitor Responsibilities
• Maintain required access controls to FMEA and
  records for material accountability
• Ensure personnel understand requirements and
  comply with FME controls
• SPP 6.5, Sections 3.3.5, and 3.3.6, contain many
  more specific requirements for both the above
  responsibilities.

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Foreign Material Exclusion Work Performance

• Some examples are
• Log all missing items or parts from tools and
  equipment entering the FMEA. Video taping or
  photographing items is an option.
• Log all tools, equipment, and material that enter
  and exit the FMEA
• Inspect tools, etc., exiting the FMEA for missing
  parts that might have been lost in the FMEA.

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Foreign Material Exclusion Work Performance

• Control of Materials Entering FMEAs
• Tape shall be placed over all pocket openings
  containing items/material.
• Pens and pencils shall be attached to a lanyard.

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Foreign Material Exclusion Work Performance

• Control of Materials Entering FMEAs (cont.)
• Loose objects such as badges and dosimetry shall
  be worn under protective clothing or placed in a
  pocket and taped, even if attached to a lanyard.
• Electronic dosimeters are considered secured if
  placed inside the pocket with the retaining clip
  over the pocket and taped.

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Foreign Material Exclusion Work Performance

• Control of Materials Entering FMEAs (cont.)
• Items of jewelry, such as earrings, wrist
  watches, rings and necklaces shall be removed or
  placed in taped pockets. However, rings which
  cannot be removed, and rings and watches covered
  by gloves shall be considered fail-safe.
• Eyeglasses shall be fastened to the wearer with
  tape, nylon cord, or eyeglass retainer straps

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Foreign Material Exclusion Work Performance

• Worker Responsibilities
• Examine all items before entry and before removal
  to identify and correct any loose or missing
  parts
• Use good work practices to minimize maintenance
  residue generated during the activity.
• Ensure parts/particles, especially valve stellite
  hard-facing, are removed before closure.

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Foreign Material Exclusion Work Performance

• Examples of Good Work Practices
• Ensure that the external surface of the component
  to be worked is free of foreign material that
  could enter the system when opened.
• Inspect and clean the work area if required
  before starting work including the area above the
  work area and ensure no loose items exist which
  could fall in the system while open. Remove or
  secure items that could fall in the system.
• Clean any new components or parts of protective
  coating or dirt before installation.
• Use only approved chemicals.
• Ensure all tools or components entering the FMEA
  that have loose or missing parts are identified
  on the accountability log.

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Foreign Material Exclusion Work Performance

• Examples of Good Work Practices (cont.)
• Visually inspect system internals for foreign
  material immediately after opening. If foreign
  material is found, notify job supervisor and FMEM
  if applicable.
• As work progresses, inspect system internals that
  will be inaccessible after further assembly.
• Ensure system cleanliness before final closure.
• Be responsible for items taken into FME areas,
  ensuring items being carried in are logged in and
  out on exit when required.
• Clean up as work progresses, rather than rely on
  large clean-up when the work is completed.

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Foreign Material Exclusion Work Performance

• FME areas are classified as
• Level 1 - FME General Housekeeping
• Level 2 - Systems/Components in which the opening
  is small, or all areas can be visually inspected
  and foreign material removed.
• Level 3 - Systems/Components in which all areas
  cannot be visually inspected and foreign material
  removed.

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Foreign Material Exclusion Work Performance

• SPP 6.5, Appendices contain requirements for
  specific activities for Levels 1, 2, and 3 and
  are listed by system for BFN and PWRs.
• Appendix G gives guidance for BFN Refuel Floor
  FME controls.
• Appendix H gives requirements for BFN Torus and
  Drywell activities.

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Foreign Material Exclusion Work Performance

• Appendix I gives guidance at PWRs, Reactor
  Equipment Pit with Head in Place.
• Appendix J gives guidance at PWRs, around Spent
  Fuel Pit, Cask Loading Area, Transfer Canal and
  Refueling Cavities when flooded.
• Appendix K gives guidance at PWRs, Control of
  Loose Debris in Ice Condenser, Modes 5, 6 and No
  Mode.

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Foreign Material Exclusion Suspension of the Job

• Often plant conditions change which requires work
  within a FMEA to be suspended. If work in a FMEA
  is stopped during a shift, between shifts, or for
  a period of time certain actions are required.

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Foreign Material Exclusion Suspension of the Job

• If work on a job will be interrupted for normal
  breaks, meals, shift turnovers, or work related
  activities, the Lead Work Performer or Job
  Supervisor shall ensure the following conditions
  are met
• Work location must be secured with appropriate
  temporary covers, plugs, or other barriers.
• To extent practical, unneeded tools, equipment,
  supplies, material, and debris are removed and
  general housekeeping requirements are met.

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Foreign Material Exclusion Suspension of the Job

• The Job Supervisor may relax the FME requirements
  when work is interrupted for longer than one
  shift, provided the following conditions are met

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Foreign Material Exclusion Suspension of the Job

• Ensure all personnel are out of the area.
• A Stop sign should be posted at the entrance to
  require all individuals who enter the area to
  contact the job supervisor before entering the
  area. FME boundaries may be removed if Stop
  signs are placed on the temporary covers.
• When FME boundaries remain ensure temporary signs
  are maintained to clearly identify the FME area
  and the responsible supervisor to be contacted
  for entry into the area.

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Foreign Material Exclusion Suspension of the Job

• Temporary plugs, covers or seals should be
  substantial and compatible with the application.
  Examples
• metal or plastic disks.
• pipe plugs,
• blind flanges,
• heavy gasket material
• herculite
• Covers should be fire resistant or fire retardant
  to the extent possible.

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Foreign Material Exclusion Suspension of the Job

• Paper products or rags inserted into openings are
  unacceptable for use as temporary plugs or covers.

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Foreign Material ExclusionRecovering from Loss
of FME Controls - Worker Responsibilities

• If a known or suspected instance of entry of
  foreign material into an open system or component
  should occur, the worker(s) shall immediately
  take action.

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Foreign Material ExclusionRecovering from Loss
of FME Controls - Worker Responsibilities

• work

• Notify

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Foreign Material ExclusionRecovering from Loss
of FME Controls - Worker Responsibilities

• If an item can not be accounted for on the
  inventory log, the worker shall notify his job
  supervisor.

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Foreign Material ExclusionRecovering from Loss
of FME Controls - Worker Responsibilities

• If the material can be easily retrieved (without
  further disassembly of the system or component)
  then the retrieval may be performed and
  documented on existing work initiating document.

Caution Radioactive Material
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Foreign Material ExclusionRecovering from Loss
of FME Controls

• Caution Radioactive Material!

• Do not remove foreign material without first
  having the material surveyed by RADCON!
• Unplanned radiation dose events have occurred
  because workers handled foreign material that was
  highly radioactive.

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Foreign Material ExclusionRecovering from Loss
of FME Controls - Work Supervisor Responsibilities

• If the missing items cannot be accounted for, the
  job supervisor shall determine if work should be
  stopped and the item retrieved or if the search
  and retrieval will be performed just before
  closure.

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Foreign Material ExclusionRecovering from Loss
of FME Controls - Supervisor Responsibilities

• A PER will be initiated for items which cannot be
  retrieved immediately.
• Safety and technical evaluations will be
  performed as appropriate.

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Foreign Material ExclusionCompleting Job Closeout

• Before a system opening is closed
• All PERs identifying FME must be evaluated
• The system determined acceptable for closure
• Closeout inspection performed and documented
• Any FME concerns resolved, documented on PER
• Workers remove all materials, debris, tools, and
  equipment.
• Initiate corrective actions for inadequate FME
  controls
• Provide feedback to work planner on problems or
  good practices

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Foreign Material ExclusionTraining Requirements

• General and specific training shall be conducted
  for
• All personnel with access to plant work areas for
  a general knowledge of FME.
• Engineers, supervisors, technicians, operators,
  planners.
• FME monitors, foremen, craftsmen, contractors.
• A list of qualified FME monitors will be
  maintained by Site Training.

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Foreign Material ExclusionPeriodic Assessment

• The Site FME Coordinator should periodically
  perform an assessment of how well the FME program
  is working.

• This would involve review of such items as work
  documents and PERs concerning loss of/or
  suspected loss of FME controls.

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Foreign Material ExclusionPeriodic Assessment

• Trends will be reviewed and any corrective
  measures should be implemented.

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Foreign Material ExclusionCommon Causes of FMI
Identified by INPO

• Insufficiently established and communicated
  management expectations for the implementation of
  FME controls.
• Limited supervisory emphasis on FME
  considerations and practices during pre-job
  briefings and monitoring of work.
• Insufficient training for workers in basic FME
  practices and a lack of specific training for
  work activities involving specialized activities
  of key plant systems.

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Foreign Material ExclusionINPO Recommendations

• Provide clearly established management
  expectations for foreign material exclusion
  controls and practices.
• Verify the work control process reinforces FME
  controls.
• Ensure initial, continuing and job-specific
  training programs provide the knowledge and
  skills needed to implement effective FME
  practices.

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Foreign Material ExclusionSOER 95-01

• On August 29, 1994, at Pilgrim, a main generator
  fault caused a load rejection that resulted in a
  reactor scram from 100 power. The fault
  resulted from overheating of stator bar
  insulation. The overheating has been attributed
  to foreign material restricting flow of the
  stator cooling water outlet header. Imprints in
  one piece of the gasket material indicate that
  the material may have covered as much as 80 of
  the outlet flow area from the most severely
  damaged stator bar.
• The unit was shutdown for 14 weeks.

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Foreign Material ExclusionSOER 95-01

• At Biblis A, 1994, during preparations for plant
  restart following a refueling outage, a fire
  occurred in the motor of a reactor coolant pump
  as a result of a short circuit in the motor
  windings. When the motor was inspected, a
  chisel, left in the motor during a previous motor
  inspection, was found to have caused the short
  circuit.
• Plant restart was delayed for approximately one
  month.

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Foreign Material ExclusionSOER 95-01

• Robinson 2
• On October 10, 1992, parts from a refueling tool
  came loose and lodged in the control rod guide
  tube of a fuel bundle. The next day, contractors
  who performed the work noticed parts were
  missing, but they did not report this to their
  supervisor or to station personnel. 18 hours
  later, the contract personnel informed their
  supervisor that the missing parts were at the
  bottom of the spent fuel pool. Their supervisor
  thought this was of limited significance and did
  not report it to station personnel. One hour
  later, a control rod would not fully insert into
  a fuel bundle, station personnel were informed
  that missing tool parts might be the cause.
  Visual inspection of the control rod revealed one
  of the missing parts stuck to the end of the
  control rod. The other parts remained in the
  guide tube of the affected fuel bundle.

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Foreign Material ExclusionSOER 95-01

• Milhama 1, 1993 - A turbine overspeed trip test
  was performed on the main turbine. During this
  test which followed a refueling outage, bearing
  lube oil pressure was 14 psig instead of the
  normal 24 psig at rated turbine speed. The
  reactor was shut down and investigation revealed
  that the bearing oil pump ejector nozzle was
  found clogged with paper towels that had been
  used to wipe the main oil pump flanges.
• The plant was off-line for an additional 6 days.

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Foreign Material ExclusionSOER 95-01

• Perry 1, 1992/93 - During a refueling outage
  debris was found on the suppression pool floor
  and on the suction strainers for 2 RHR pumps.
  The strainers were replaced in a future outage
  due to deformation from excessive differential
  pressure caused by debris on the strainers.
• Additionally, filter media for 3 large air
  filters in the drywell air coolers, used to
  provide filtered air in the drywell during plant
  outages, was determined to be the source of
  fibrous material found coating the suction
  strainer during another outage.

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Foreign Material ExclusionSOER 95-01

• Dresden 3, 1993 - A reactor scram occurred due to
  flow restriction in the high-pressure section of
  the main turbine. A bolt, slugging wrench, and
  key stack that fit together to form a tool had
  been left in the main steam piping during a
  previous outage.
• These parts caused extensive damage to the
  first-stage turbine rotor and stationary
  diaphragm blades. The blading deformation
  partially blocked the steam flow.
• A two-month forced outage was required to repair
  the HP turbine.

88
Foreign Material ExclusionSOER 95-01

• Hatch 2, 1992 - Fuel sipping identified failed
  fuel bundles. Inspection revealed debris in 102
  of the bundles. Some of the bundles were damaged
  from ferrous metal chips from machining
  activities performed on primary system piping
  during the previous refueling outage.

89
Foreign Material ExclusionSOER 95-01

• Point Beach 2, 1992 - A foam rubber plug was
  found blocking a containment spray pump. The
  plug had been installed in the piping for
  cleanliness control during modification work that
  installed full flow test lines in the containment
  spray, RHR, and safety injection systems during a
  previous outage.

90
Foreign Material ExclusionSOER 95-1

• Many of these events caused delays in restart of
  a unit, or forced outages to repair damage to the
  plant.

91
Foreign Material ExclusionWBN Event NRC
Inspection Report No. 50-390/97-11

• On September 20-21, 1997, with the reactor
  defueled, a rad-worker noted four, small foreign
  objects lying on the reactor vessel flange.
  Because of his concern for FME (Error Precursor
  Can-do attitude), the rad-worker placed three
  pieces of the material in a plastic bag without
  having the appropriate radiation survey conducted
  and subsequently removed the bag from the reactor
  vessel cavity area.

92
Foreign Material ExclusionWBN Event NRC
Inspection Report No. 50-390/97-11 (contd)

• One piece of foreign material was later
  determined to have a contact reading of 56
  Rem/hour.
• Calculations indicate that the worker received
  3.645 Rem to his hand or about 7 of the NRC
  annual extremity limit of 50 Rem.

93
Foreign Material ExclusionOE 9543

• While preparing to install a new Low Pressure
  Stop Valve on the 2B Reactor Feed Pump, workers
  disassembled a NEW valve to inspect for foreign
  material and found a handfull of metal shavings
  and grease inside the valve near the plug and
  seat area.
• This foreign material was not visible prior to
  disassembly of the valve. The workers removed
  all foreign material from the valve and then
  installed the valve successfully.
• If the workers had not removed this foreign
  material, it could have been introduced into
  primary plant systems resulting in possible fuel
  and component damage.

94
Foreign Material Exclusion OE 9543

• The root cause of this incident is
• Less than adequate foreign material intrusion
  controls by the equipment supplier.
• The equipment supplier has since instituted final
  inspection requirements to prevent a future
  incident of this type.

95
SUMMARY

• During past years, foreign material intrusion
  events have occurred with an increasing frequency
  resulting in the following
• nuclear fuel cladding damage
• major equipment damage
• heat transfer capability degradation
• increased radiation levels
• increased presence of discrete radioactive
  particles
• increased radwaste generation
• system flow characteristics degradation
• unscheduled plant outages and outage extensions

96
Summary

• All employees must maintain an awareness of
  Foreign Material Exclusion during maintenance
  activities and especially during an outage.

97

• Examination Instructions-
• Your examination must be proctored.
• You may review the course as much as you wish
  before taking the test.

98
Exam Ground Rules

• No communication, except between student and
  proctor.
• No reference material other than SPP-6.5 is
  permitted during testing.
• All answers given are to be your own, and you are
  not to receive assistance on the exam, nor are
  you to provide assistance to another student on
  the exam.
• Violations of exam integrity will result in
  disciplinary action.
• By entering the exam and requesting a proctor
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99
FOREIGN MATERIAL EXCLUSION

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100
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