IAEA Training Course on Safety Assessment of NPPs to Assist Decision Making

Workshop InformationWorkshop InformationIAEA Workshop IAEA Workshop

Safety Assessment Process. Plant Safety Assessment Process. Plant Modification. Regulatory point of viewModification. Regulatory point of view

LecturerLesson II 2_3

City , CountryXX - XX Month, Year

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Basis Principles of Safety AssessmentBasis Principles of Safety Assessment(1/4)(1/4)– Safety Assessment is a basic task of designer, operator and

regulator.– It is connected to:

• Design and licensing of a new facility.• Periodic safety review.• Modification of an older plant.• Continuous evaluation of safety performance of an operating

plant.

– Reference material: “Safety Assessment and Verification for Nuclear Power Plants” (IAEA, Safety Guide, No. NS-G-1.2, Vienna, Nov. 2001).

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Basis Principles of Safety Assessment Basis Principles of Safety Assessment (2/4)(2/4)

– This presentation concentrates to regulatory safety assessment activities.

– Tools applied vary from engineering judgement to use of complicated computer codes depending of the nature of issue and of capabilities of the Regulatory Body.

(1) Regulatory Body may employ experts or expertorganisations for the evaluation of safety matters arising during its regulatory activities.

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Basis Principles of Safety Assessment Basis Principles of Safety Assessment (3/4)(3/4)– Role of TSOs in the assessment:

• Independency in tools and manpower (e.g. Alternative codes, not “contaminated” manpower)

• Competency - regulatory R&D programme.– International co-operation and information exchange:

• Use TSOs from abroad.• Assistance projects of:

IAEA - methodology (Guidelines)- missions (e.g. IPERS for seismic and PSA)- workshops- training courses- scientific visits

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Basis Principles of Safety Assessment Basis Principles of Safety Assessment (4/4)(4/4)

• Participation in work of different groups and committees.

EC - TACIS, PHARE-projects (RAM, TSO)

OECD-NEA (CNRA, CSNI and subgroups)NERS - Network Countries with Small Nuclear programmesEC - CONCERT, ENIS-G, NRWGVVER Regulators Forum

• Bilateral contacts

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The basic process for modification(*: including regulatory inspection (if necessary)).

The basic process for modification(*: including regulatory inspection (if necessary)).

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Reference material; “Modifications to Nuclear Power Plants” (IAEA, Safety Guide, No. NS-G-2.3, Vienna, October 2001).

As example: Hungarian approach to NPP modification.

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Legal Basis of ModificationLegal Basis of Modification (1/3)(1/3)– Act CXVI of 1996 on Atomic Energy, Section 17.

(excerpts).• “The following activities fall into the scope of HAEA:

a) Nuclear safety licensing required for the siting, construction, enlargement, commissioning, operation, modification, putting out of operation, decommissioning of nuclear facilities;”……

b) “With regard to nuclear equipment, nuclear safety and technical radiation protection licensing and inspection of activities related to the design, manufacture, installation (fitting in) commissioning, operation, modification (repair), imports form abroad, putting out of operation and decommissioning;”

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Legal Basis of ModificationLegal Basis of Modification (2/3)(2/3)– Government Decree 108/1997 (VI.25) Korm. on the Procedures

of HAEA in Nuclear Safety Regulatory Matters, and its Attachments Nuclear Safety Regulations, Volumes 1.-5.)• Vol.1. Regulatory Procedures for NPPs. Chapter 4. Licensing of

Modifications:Reason and scope of modifications.Licensing process and its requirements.Requirements for contents of submission of license (e.g. Reason and objective of modification, design basis, changes in FSAR, description of equipment/system to be modified, etc.)

– Safety Guidelines issued by DG of HAEA (relevant to the subject)• Nr.1.5 Licensing Documentation for Modification of Nuclear

Power Plant Systems and Components

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Legal Basis of ModificationLegal Basis of Modification (3/3)(3/3)

Nr. 1.13 Regulatory Procedure for Regulatory Evaluation (review and assessment) of Licensee Request (draft).

Nr. 1.24 Periodic Reporting Obligations of NPPs.Nr. 3.10 Methodologies for Analysis of Safety Effects of

Modifications (draft).– Position/declaration of the Head of the HAEA/NSD on the licensing

process of temporary modifications.

• Additional condition for the case of abnormal (accident or emergency) situation when immediate modification action without regulatory approval is allowed to be taken for the sake of accident prevention or management. (After getting experience enough in its application it will become part of guideline Nr. 1.5).

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Licensing of ModificationLicensing of Modification (1/3)(1/3)– Multistep Process:

• Modification license of principle or conceptual modification license (analysis for safety effects of modification - technical design).

• Manufacturing (domestic product) or import (foreign product9 license (features and technical specification of equipment and its components, harmonisation of data, parameters and conditions quantification, QA, etc).

• Assembly/erection license (execution of the modification on the site without connection to any other (not modified) system, structures and components).

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Licensing of ModificationLicensing of Modification (2/3)(2/3)

– Steps can be drawn together if the issue is simple– Different requirements according to safety significance:

Modified SSC is classified by safetyActivity is relevant to safety

• Modification license (on basis of construction plants, test programme, operational limits and conditions, changes (if any) in conception, commissioning process, (QA).

• Operational license (for long term operation).

• Regulatory license is needed only if:

• Independent expert assessment is required to attach only in safety classes No. 1. And 2.

• Manufacturing/import license as well as assembly/erection license is not required from Regulatory Body but from Safety Division of the plant in safety class No. 3.

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Initiation of Modification Initiation of Modification (3/3)(3/3)Sources of initiations

Regulatory Body– New Requirements

• Regulations• Safety concerns

– Findings of Events• Root causes• Lessons learned

– Results of Regulatory R&D Projects

Utility/Licensee – On-Compliences of (new)

Regulations– Safety Upgrading Measures of

Periodic Safety Review– Feedback of Operational

Experiences• Failure statistics• Repair & maintenance reports

– Efficiency Improvements• Refurbishments• Organisational structure• Fuel cycle