Category Archives: Nuclear power plant life management processes: Guidelines and practices for heavy water reactors

COORDINATION OF SSC AGEING MANAGEMENT PROGRAMME

A root cause of premature ageing degradation can be traced often to a lack of communication, documentation, and coordination between design, operation, and maintenance organizations. This results from the general situation that, except for major SSCs (such as fuel channels), there is not explicit responsibility on one plant person to achieve a specific SSC lifetime.

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RECOMMENDATIONS

After assessing remaining life of a component, recommendations are to be developed for more detailed life evaluations and in-depth analyses of fuel channel for identified degradation areas, then the recommendations to be performed as a part of Phase II PLiM programme. The followings can be issued for the recommendations of life management of fuel channels: stress analysis for nip-up condition […]

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HUMAN ISSUES RELATED WITH HUMAN AGEING MANAGEMENT

1.1.2. Availability of qualified NPP personnel Availability of qualified NPP personnel is an important issue for PLiM; this includes validated staff selection methods and organizational issues. Even if NPPs are technologically at a high level they still require to be operated in a manner that conforms to safety prescriptions, technical specifications (TS), and good practices, which includes avoidance of transients, […]

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STEAM GENERATORS

Extensive analysis and studies of HWR steam generators have already been completed, including an IAEA TECDOC that covers CANDU steam generators [I.2]. Typically, a comprehensive PLiM Life Assessment or a Life Cycle Management plan specific to the individual plant’s steam generators is completed and factored into the in-service inspection and maintenance to ensure plant life attainment. These plans are updated […]

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Category 3 — Important SSCs

For these components preventive maintenance, ISI, and condition monitoring/assessment are possible to mitigate Ageing and are replaced in a planned basis during operating phase. For examples: end shield cooling system equipments, Calandria vault cooling system components, PHT feed pumps, turbine generator system, process water systems piping and equipments, feedwater system piping and equipments, heat exchangers, diesel generators, UPSs, batteries.

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AGEING MANAGEMENT PROGRAMME

This activity has as purpose to arrive at the end of the design life with a safe operation. The SECs that are not in the pilot plan, they are includes because at the end of the design life they will be replaced, they are the pressure tubes, calandria tubes, feeders. Secondary side piping is not included also. For these components […]

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INTRODUCTION

1.1. BACKGROUND The design life of a nuclear power plant (NPP) does not necessarily equate with the physical or technological end-of-life (EOL) in terms of its ability to fulfill safety and electricity production requirements. Operating equipment, generically called systems, structures and components (SSCs) in a NPP is subjected to a variety of chemical, mechanical and physical conditions during operation. Such […]

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