AREA D – AGEING MANAGEMENT OF ELECTRICAL AND I&C SSCs

Use C-1.

D-2 - AMPs of electrical and I&C SSCs Use C-2.

D-3 - Equipment qualification programme for all SSCs References

SSR-2/1 (Rev. 1): Req. 30, 5.48–5.50; SSR-2/2 (Rev. 1): Req. 13, 4.48–4.49, Req. 16, 4.54;

SSG-48: 3.12, 3.16–3.17, 3.21, 3.33–3.35, 4.16–4.18, 4.23–4.31, 5.67–5.69, 7.26–7.27, 7.28;

NS-G-2.13: 2.21, 3.1, 3.9, 3.11, 3.20

Expectations

SSR-2/1 (Rev. 1) – Requirement 30: Qualification of items important to safety [8]

“A qualification programme for items important to safety shall be implemented to verify that items important to safety at a nuclear power plant are capable of performing their intended functions when necessary, and in the prevailing environmental conditions, throughout their design life, with due account taken of plant conditions during maintenance and testing.”

“5.48. The environmental conditions considered in the qualification programme for items important to safety at a nuclear power plant shall include the variations in ambient environmental conditions that are anticipated in the design basis for the plant.”

“5.49. The qualification programme for items important to safety shall include the consideration of ageing effects caused by environmental factors (such as conditions of vibration, irradiation, humidity or temperature) over the expected service life of the items important to safety. When the items important to safety are subject to natural external events and are required to perform a safety function during or following such an event, the qualification programme shall replicate as far as is practicable the conditions imposed on the items important to safety by the natural external event, either by test or analysis, or by a combination of both.”

“5.50. Any environmental conditions that could reasonably be anticipated and that could arise in specific operational states, such as in periodic testing of the containment leak rate, shall be included in the qualification programme.”

SSR-2/2 (Rev. 1) – Requirement 13: Equipment qualification [1]

“The operating organization shall ensure that a systematic assessment is carried out to provide reliable confirmation that safety related items are capable of the required performance for all operational states and for accident conditions.”

“4.48. Appropriate concepts and the scope and process of equipment qualification shall be established, and effective and practicable methods shall be used to upgrade and preserve equipment qualification. A programme to establish, to confirm and to maintain required equipment qualification shall be launched from the initial phases of design, supply and installation of the equipment. The effectiveness of equipment qualification programmes shall be periodically reviewed.”

“4.49. The scope and details of the equipment qualification process, in terms of the required inspection area(s), method(s) of non-destructive testing, possible defects inspected for and required effectiveness of inspection, shall be documented and submitted to the regulatory body for review and approval. Relevant national and international experience shall be taken into account in accordance with national regulations.”

SSR-2/2 (Rev. 1) – Requirement 16: Programme for long term operation [1]

“4.54. The comprehensive programme for long term operation shall address:

(a) Preconditions (including the current licensing basis, safety upgrading and verification, and operational programmes);

(b) Setting the scope for all structures, systems and components important to safety;

(c) Categorization of structures, systems and components with regard to degradation and ageing processes;

(d) Revalidation of safety analyses made on the basis of time limited assumptions;

(e) Review of ageing management programmes in accordance with national regulations;

(f) The implementation programme for long term operation.”

Evaluations

SALTO Working Notes Outlines for NPPs, Section D-3 (available on IAEA website https://www.iaea.org/services/review-missions/safety-aspects-of-long-term-operation-salto)

Examples of documents for the review

— Design supporting documents;

— Equipment master list for equipment qualification;

— Equipment qualification files for qualified equipment;

— Programme for monitoring the environmental conditions;

— Programme for monitoring and maintaining the equipment conditions;

— Requalification programme;

— Scheduled equipment replacement programme;

— Report on PSR;

— SAR.

D-4 - Technological obsolescence management for all SSCs References

SSR-2/2 (Rev. 1): Req. 10, 4.38, Req. 16, 4.54; SSG-48: 3.20–3.21, 3.27–3.28, 3.33, 6.1–6.12

Expectations

SSR-2/2 (Rev. 1) – Requirement 10: Control of plant configuration [1]

“The operating organization shall establish and implement a system for plant configuration management to ensure consistency between design requirements, physical configuration and plant documentation.”

“4.38. Controls on plant configuration shall ensure that changes to the plant and its safety related systems are properly identified, screened, designed, evaluated, implemented and recorded. Proper controls shall be implemented to handle changes in plant configuration

that result: from maintenance work, testing, repair, operational limits and conditions, and plant refurbishment; and from modifications due to ageing of components, obsolescence of technology, operating experience, technical developments and results of safety research.”

SSR-2/2 (Rev. 1) – Requirement 16: Programme for long term operation [1]

“4.54. The comprehensive programme for long term operation shall address:

(a) Preconditions (including the current licensing basis, safety upgrading and verification, and operational programmes);

(b) Setting the scope for all structures, systems and components important to safety;

(c) Categorization of structures, systems and components with regard to degradation and ageing processes;

(d) Revalidation of safety analyses made on the basis of time limited assumptions;

(e) Review of ageing management programmes in accordance with national regulations;

(f) The implementation programme for long term operation.”

SSG-48 [2]

“3.20. A systematic approach should be applied to managing the ageing and obsolescence of SSCs to ensure that required intended functions are maintained at all times during the operation stage of the nuclear power plant.”

“3.27. The availability of spare parts or replacement parts and the shelf life of spare parts or consumables should be continuously monitored and controlled (see paras 6.6 and 6.7).”

“3.28. Where spare parts or consumables could be vulnerable to degradation mechanisms owing to their storage environment (e.g. high or low temperatures, moisture, chemical attack and dust accumulation), measures should be taken to ensure that they are stored in an appropriately controlled environment.”

“6.1. Technological obsolescence of the SSCs in the plant should be managed through a dedicated plant programme with foresight and anticipation and should be resolved before any associated decrease in reliability and availability occur.”

Evaluations

SALTO Working Notes Outlines for NPPs, Section D-4 (available on IAEA website https://www.iaea.org/services/review-missions/safety-aspects-of-long-term-operation-salto)

Examples of documents for the review

— Procedures for the management of technological obsolescence;

— Documentation to support SSC obsolescence and replacement;

— List of spare parts;

— Maintenance records;

— Long term investment programme for classified equipment and systems.

D-5 - Verification of scope setting results for electrical and I&C SSCs Use C-4.

D-6 - Data collection and record keeping for electrical and I&C SSCs Use C-5.

D-7 - Documentation of ageing management and documentation in support of LTO for electrical and I&C SSCs

Use C-6.

4.5. AREA E – AGEING MANAGEMENT OF CIVIL SSCs