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Also the implied “residual” risk of not including other SSCs will be identified. The rigour of the ageing assessment, in terms of resources required and depth of evaluation will be determined by the SSC priority. In situations where parts of a PLiM programme are already underway without undertaking the up-front SSC screening, a systematic procedure for SSC screening should be used to verify that there are no gaps in identification of the remaining SSC assessments to be performed. The SSC prioritisation also assists utilities in identifying less critical SSCs.

In order to complete an additional 25 to 30 years of life, some action is needed to replace this equipment in view of the potential for declining reliability and difficulty in getting spare parts. • Programmable digital comparators (PDCs) — The PDCs are used in the reactor shutdown systems. The issue here is quite similar to the control computers and replacement will be required to complete the refurbished life. • Main generator — The windings of the generator have a limited life insufficient to last throughout the refurbished plant life.

INTERNATIONAL ATOMIC ENERGY AGENCY, Cost Drivers for the Assessment of Nuclear Power Plant Life Extension, IAEA-TECDOC-1309, IAEA, Vienna (2002). INTERNATIONAL ATOMIC ENERGY AGENCY, Assessment and Management of Ageing of Major Nuclear Power Plant Components Important to Safety: Primary Piping in PWRs, IAEA-TECDOC-1361, IAEA, Vienna (2003). INTERNATIONAL ATOMIC ENERGY AGENCY, Pilot Study on the Management of Ageing of Instrumentation and Control Cables, IAEA-TECDOC-932, IAEA, Vienna (2000). PLEX 93 Zurich NEA report NEA/SEN/NDC, Status Report on Nuclear Power Plant Life Management, Country report from Canada (2000) INTERNATIONAL ATOMIC ENERGY AGENCY, Periodic Safety Review of Nuclear Power Plants, Safety Guide No.

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