Leonti Chaloyan

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MODERNIZATION PROJECTS OF ANPP IC SYSTEMS, 22
LICENSING APPROACH
Leonti Chaloyan Deputy Chief Engineer
Armenian NPP
Regional Workshop Portoroz,
Slovenia 14 -18 April 2008
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GENERAL INFORMATION
ANPP is located in the western part of Ararat
valley 30 km west of Yerevan close to Metsamor
town
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BACKGROUND

• The ANPP consists of two WWER-440 power units.
• Unit 1 was commissioned in 1976 and Unit 2 in
  1980, respectively.
• Units 1 and 2 were shutdown in February and
  March, correspondingly of 1989.
• In 1993 the Government of Armenia made a decision
  on restart of ANPP Unit 2.
• Following the completion of repair and safety
  upgrading activities Unit 2 was connected into
  power grid in 1995.
• Unit 1 remains in long-term shutdown.
• The design lifetime of Unit 2 expires in 2016.

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MAIN GOALS

• Elimination of non-compliances with current
  safety standards regarding first of all safety
  related issues, and/or reduction of the impact of
  these non-compliances on safety by means of
  corrective actions
• Enhancement of reliability of safety important
  systems, equipment and elements
• Reduction of common cause failure probability
• Implementation of IAEA recommendations related to
  WWER NPPs safety improvement.

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Improvement of IC and Automatic Control Systems.

• Replacement of non-seismic relays in emergency
  process protections logics with those having
  seismic resistance.
• Replacement of non-seismic sensors and secondary
  instruments involved in protections and
  interlocks logics with those having seismic
  resistance.
• Installation of main steam isolation valves on
  main steam lines.
• Installation of primary to secondary circuit leak
  detection system.

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Improvement of IC and Automatic Control Systems.

• Commissioning of Safety Parameters Display
  System.
• Replacement of IV500 computer with an up-to-date
  computer.
• Implementation of automatic primary and secondary
  water chemistry monitoring system.
• Improvement of plant dose control system.

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Improvement of IC and Automatic Control Systems.

• Improvement of Iney source range system for
  automatic neutron flux monitoring.
• Installation of reactor vessel level detection
  system.
• Improvement of SG level automatic control system.
• Reconstruction of automatic reactor power
  controller.

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IQ PROGRAMM

• The qualification programme has been developed
  under UK DTI project in 2006.
• Document Evaluation of environment conditions in
  safety system rooms with new design basis
  accidents has been developed in 2006 (in the
  framework of completion of integrated activities
  related to extension of design basis accidents
  spectra to include Dcon 100mm breaks).

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22 LICENSING APPROACH
ANRA
Design Manufacturing Safety and/or Reliability
analysis Installation Personnel
Training Commissioning/Testing Documentation
Updating
ANPP

• source range neutron flux monitoring system
• water chemistry control system
• reactor gas removal system
• radiation monitoring system

Improvement of the IC system at ANPP
OSA
RISKAUDIT
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DMD Source Range Monitoring System
Project A1.01/00B
Scope of the Project Upgrading of the existing
SRMS to overcome obsolescence of components, to
improve reliability and maintainability, to
increase the man-machine interface. Main System
Implementation Six new flux fission Chambers
with higher sensitivity, six new Measurement
Instrumentation chambers and related Power Supply
Systems, a Reactivity Processing Unit,
Instrumentation (analog and digital). Safety
Justification Improvement of SRMS reliability
through higher sensitivity of new detectors.
Enhance of correctness of sensor signals, Enhance
of ANPP signal Interfacing with the availability
of a Reactivity Processing Unit and digital
technology. Enhance SPMS maintainability with the
replacement of a decade-old products with a
state-of-the-art technology.
IC
Sub.B3
SRMS
DMD
?
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LICENSING PROCESS MAIN STAGES

• Stage 1
• DMDs

ANRA Agreement
Stage 2 Technical Requirements
ANRA Agreement
ANRA Agreement
Stage 3 Equipment Manufacturing and Testing
ANRA Agreement
Stage 4 Engineering Documentation
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LICENSING PROCESS MAIN STAGES (cont)

• Stage 5
• Equipment Installation and Commissioning Tests

ANRA Witness
ANRA Approval
Stage 6 Permit to Operate
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LICENSING REPORT CONTENT

• Introduction
• Summary
• Project description
• Design basis
• Classification criteria
• Modification. Technical specification
• Manufacturing specification
• Safety analysis report
• Reliability analysis report

• Equipment installation specification
• IC system
• Man-machine interface
• Personnel training
• Power supply
• Acceptance tests
• Station documentation updating
• Project performance schedule

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OUR PLANS

• Modernization of diesel-generators
  instrumentation and control systems in 2009.
• Installation of leak detection diagnostics in
  2008.
• Implementation of activities aimed at improvement
  of separation and independence of trains and
  reactor protection actuation logic including
  adjustment capability to the extent possible in
  2009.
• Installation of boron solution concentration
  continuous automatic devices in 2009.

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THANK YOU FOR YOUR ATTENTION!