Russian regulatory approach to extension of nuclear power plants

operational life.Vasilieva E.V., Karpunin N.I.

Federal State Institution «Scientific and Engineering Centre for Nuclear and Radiation Safety» (SEC NRS)

Second International Symposium on Nuclear Power Plant Life Management, Shanghai, China, 15-18 October 2007

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Contents• General system of regulatory legislative acts and regulatory documents in the field of nuclear energy in Russia for PLEX.

• Contents of the Federal Norms and Rules “The main Requirements for Extension of the Operational Life of NPP Unit” (NP-017-2000).

• Two main stages of NPP unit preparation for its operational life extension.

• PLEX of operating NPP units.• Conclusions.

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Long term operation (LTO) strategy1. “RF Nuclear power development program for the

period 2007-2010 and for the period up to 2015”,approved by Government act № 605, 06.10.20062006 year became very important in development of nuclearenergy in Russia . The President of RF decreed a task of accelerating development of nuclear industry in hisspeech to Federal Meeting of RF.

2. «Strategy of Development of Nuclear Power Industry in the 1st Half of XXI Century».

This document envisages provisions for :– Extension of operational life of NPPs in operation .– Adding new capacity by completion of units under

construction and building new units.

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ΙV Normative Documents of the State Regulator(Rostechnadzor), Authorities

General system of regulatory legislative acts and regulatory documents in the field

of nuclear energy in Russia

ΙΙ Regulatory and Legislative Acts of the President and Government

ΙΙΙ Federal Norms and Rules in Nuclear Energy

Ι. International Agreements and legislative Acts

V Normative Documents of the Management (Rosenergoatom), Authorities of Nuclear Energy, Standards , Codes and Practices

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Federal laws and regulatorylegislative acts of the President of RF and the Government of RF for PLEX

Ι. Federal laws :• “On the Use of Nuclear Energy“ (article 9).

ΙΙ. Regulatory legislative acts of the President of RF and the Government of RF• “Program of Nuclear Power Engineering Development of Russia for the Period of 2007-2010 and up to 2015“, approved by the Decree of the Government of RF of 06.10.06.• “Regulations on Licensing Activity in the Field of Nuclear Energy Use”, approved by the Decree of the Government of the RF of 14.07.1997.

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ΙΙΙ. Federal rules and regulations for PLEX

• “General Regulations on Ensuring of Nuclear Power Plants Safety”, OPB-88/97, NP-001-97 (p.5.1.14).

• “Rules on Design and Safe Operation of Components and Pipelines of Nuclear Power Installations”, PNAE G-7-008-89, (p.2.1.11).

• “The Main Requirements for Extension of the Operational Life of NPP Unit”, NP-017-2000.

• State standard «Reliability of Nuclear Power Plants and their Equipment».

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ΙV. Regulatory documents of Rostechnadzor for PLEX

• Regulatory Guidelines (RD): – «Requirements to the Set and Contents of the Documents Justifying Safety during Additional Operating Lifetime of the NPP Unit» (RD-04-02-2006).

• Safety guidelines (RB were developed within the frames of IAEA project RUS/9/003):– “Guidelines to the Contents of the Report on In-Depth Safety Assessment of Operating NPP Units» (OUOB AS), RB-001-05.– “Contents and Composition of the Report on NPP Unit Comprehensive Survey for Extension of its Operational Life”, RB-027-04.

– “Discrepancy Analysis of NPP Unit with regard to Requirements of Actual Regulations “, RB-028-04.– “Contents and Composition of Documentation on Justifying Residual Lifetime of NPP Unit Components for the Purpose of the Operational Life Extension”, RB-029-04.

– «Operational Experience Analysis for the Purpose of NPP Unit Operational Life Extension”, RB-030-04.

• Documents on certification of equipment, products andtechnologies (on PLEX of different NPP components).

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V. Regulatory documents of the concern “Rosenergoatom” for PLEX

• Regulatory Guideline “Standard Program of Comprehensive Survey of NPP Unit for Extension of the Operational Life”, RD-EO-0283-01.

• Regulatory Guideline “Provision on Management of Resource Characteristics of NPP Units Components”, RD-ЕО-0281-03.

• Regulatory Guideline “Program of Quality Assurance of Activities on Extension of the First Generation NPP Units Operational Life (standard)”, RD-ЕО-0291-01.

• “General Provisions on Extension of the Second Generation NPP Units Operational Life”, RD-ЕО-0327-01.

• Standard “The Procedure of Organization and Modernization of NPP Systems and Equipment”, ST-EО-0542-2004.

• Methodological documents and guidelines on the problems of residual life-time assessment of different types of equipment (more than 50 documents).

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Contents of the Federal Norms and Rules“The main Requirements for Extension of the Operational Life of NPP Unit” (NP-017-2000)

• General provisions.• Criteria of the possibility of the NPP unit operation during additional operational lifetime.

• Requirements for the unit preparation for additional operational lifetime.

• General provisions on comprehensive examination of the NPP unit.

Decision on PLEX or decommissioning shall be made 5years before the design operational life is expired.

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Technical and economic factors for definition of duration of NPP unit operating lifetime above design operating lifetime

• Possibility of ensuring and maintenance of safety during NPP unit operation.• Presence of necessary residual life of non-recoverable NPP unit equipment.• Possibility of provisional storage of additional amount of spent nuclear fuel or its removal from the NPP site. • Possibility of safety ensuring during management with radioactive wastes formed during additional operational term.• Possibility of NPP unit safety assurance during its decommissioning.

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Necessary arrangements for PLEX• To fulfill comprehensive examination.

• To develop a program of NPP unit preparation for extension of its operational life.

• To carry out preparation of NPP unit for extension of its operational life including justification of safety and residual life of the components, replacement of overage equipment and modernization and reconstruction of NPP unit if necessary.

• To carry out necessary tests.

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Criteria of the possibility of the NPP unit operation during additional operating lifetime

• Operation of NPP Unit is possible if necessary measures aimed at bringing it in compliance with the requirements of the valid regulatory documents are implemented.

• Technical condition of NPP Unit should meet the requirements of the relevant technical documentation.

• Within the period of additional operational time the activities on safety improvement should continue.• Residual Lifetime of non-replaceable safety-related equipment must be justified and sufficient for extended

operational time.• Management of reliability of equipment, buildings and structures must be implemented (Aging Management Program

must be elaborated and executed).• Efficiency of methods and measures for safety-related equipment, buildings and structures should be sufficient for detection and prevention of initialing events.

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During comprehensive examination it is necessary to define

• Components important for safety with expired operational lifetime that are to be replaced.

• Components important for safety with expired operational lifetime, but having possibility of its extension at the expenseof periodical maintenance and repair.

• Components important for safety which have residual lifetime and their operation may be extended for a definite period of time.

• Non-recoverable (irreplaceable) components and preliminary assessment of their residual lifetime.

• Possibility of storage of spent nuclear fuel and radioactive wastes formed during additional operational lifetime.

• Possibility of safe radwaste management.

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Two main stages of NPP unitpreparation for its operational life extension

1. The first stage:• (a) comprehensive examination of the unit;• (b) estimation of technical possibility of the operational life

extension for unit components or their replacement;• (c) safety assessment of the NPP unit;• (d) preparation of investment project. 2. The second stage:• (a) justification of operational life extension for

non-recoverable and irreplaceable elements;• (b) implementation of complex program for unit modernization;• (c) justification of NPP unit safety during additional operational

lifetime (In-depth Safety Assessment of the NPP unit);• (d) receiving of Rostechnadzor license for operation during

additional operational lifetime.

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General procedure of PLEX (according to NP-017-2000 )

Obtaining a longObtaining a long--term license for operation term license for operation beyond design operational lifebeyond design operational life

Comprehensive examination of the NPP unit

Justification of residual lifetime of non-replaceable and non-repairable components of the NPP unit

Modernization of the NPP unit in order to enhance its safety

In-depth Safety Assessment of the NPP unit

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In-depth safety assessment (DSAR)• The second stage is finished with implementation of a more

profound NPP unit safety analysis and development of the report on in-depth safety assessment (DSAR).

• DSAR is developed in accordance with recommendations from Rostechnadzor (RB-001-05) taking into account all the modifications implemented at the unit. DSAR consists of the summary book and four appendices.

• Four appendices are developed to the summary:• Appendix 1 “Materials on technical safety justification (TSJ)”;• Appendix 2 “Materials on additional safety justification”;• Appendix 3 “Probabilistic safety analysis”;• Appendix 4 “Analysis of beyond design basis accidents”.

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Unit safety concept in Summary of DSAR• presents design criteria and safety principles.• shows how nuclear and radiation safety requirements are met.• defines and describes safety systems.• gives the value of safe operation limits and design limits for

design basis accidents.• carries information on fire safety.• gives the list of expected levels of extreme natural and man-

induced impacts with recurrence more than 10-2/year.• presents conditions of normal operation at design modes.• expounds general principles and criteria of physical safety.• gives arrangements plans in case of accidents.

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Location of Nuclear Power Plants in Russia.10 NPPs, 31 Units, N=23,2Gwt

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The license has been obtained for first generation NPP units (duration of additional

operation term-15 years)

– Unit 1,2,3,4,Bilibino NPP (EGP-6)– Unit 3, Novovoronezh NPP (WWR-440)– Unit 4, Novovoronezh NPP (WWR-440)– Unit 1, Kola NPP (WWR-440)– Unit 2, Kola NPP (WWR-440)– Unit 1 and 2 of Leningrad NPP (RBMK-1000)– Unit 1, Kursk NPP (RBMK-1000)

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Second generation units of Russian NPP, which design operating lifetime expires in the

period 2009- 2013

– Unit 3 Beloyarsk NPP(BN-600), 15 years

– Unit 5, Novovoronezh NPP(RBMK-1000), 25-30 years

– Unit 1, Smolensk NPP, (RBMK-1000), 15-20 years– Unit 3, Kola NPP (WWR-440), 25-30 years– Unit 2, Kursk NPP (RBMK-1000), 15 years– Unit 3, Kursk NPP (RBMK-1000), 15-20 years – Unit 3 of Leningrad NPP (RBMK-1000), 15-20 years– Unit 4 of Leningrad NPP (RBMK-1000), 15-20 years

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Conclusions• Full set of regulatory documents on operation life extension of different types NPP units was developed In Russian Federation. • There’re activities on modernization of regulatory documents of different levels in accordance:- with scientific and engineering achievements in thefield of nuclear energy use;- with process of harmonization of regulatory RFand IAEA documents.

• Practical experience in PLEX is available( 11 units are operated beyond design life).

• Wide Russian experience in the field of development of regulatory documents for PLEX may be used in international cooperation.