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

SUPPORTING DATA MANAGEMENT

Effective PLiM of HWR NPPs implies more effective use of plant data trends using instrumentation and monitors that often already exist at the plants. Also the integrity of ageing related plant data is a significant concern in the nuclear industry. With the passage of time, retention, integrity, and accessibility of data histories within the plant culture and organization can become […]

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LARGE SCALE FUEL CHANNEL REPLACEMENT (LSFCR)

The cost and duration of a LSFCR outage can vary substantially. Shorter LSFCR outages can be achieved but with increased up-front development cost and labour premium costs during execution. Typical pre-planning activities for an LSFCR have found that the facilities provided in the existing HWR designs for undertaking LSFCR may be limited and access constrained. These limitations should be addressed […]

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PRESSURIZED HEAVY WATER REACTOR PLiM PROGRAMME OF INDIA NUCLEAR POWER STATION

A. I.1. INTRODUCTION This section covers plant life management in general at Indian PHWRs. Plant life management of PHWRs in India generally follows the practices identical to CANDU reactors as given in Chapter 3. Nuclear Power Corporation of India Ltd (NPCIL) conducts PLiM exercise at its plants as per requirements specified in NPCIL HQI-7005 and Atomic Energy Regulatory Board safety […]

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IMPLEMENTATION PLiM PROGRAMME

The design and application of a plant life management (PLiM) programme has been a concern for both Comision Nacional de Energia Atomica (CNEA) and Central Nuclear Embalse (CNE). Recently, the utility (CNE) and the research and development institution (CNEA) have signed an agreement in order to enface together the problem as a whole. Plant operation experience provided by CNE and […]

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

The time is right to address nuclear power plant life management and ageing management issues in terms of processes and refurbishments for long term operation and license renewal aspects of heavy water reactors (HWRs) because some HWRs are close to the design life. In general, HWR nuclear power plant (NPP) owners would like to keep their NPPs in service as […]

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LEARNING FROM EXPERIENCE

3.6.1. Operating experience feedback Sharing of experience and learning from operating experience (including errors), from R&D programmes and the assessment of performance trends should be used as input to an effective PLiM programme. However, relying solely on a “learning by mistake” strategy is not advisable, because it involves reliance on “unanticipated ageing” and unanticipated ageing is costly. It generally requires […]

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CONTAINMENT

The integrity of the reactor building for the additional operational life period is an important PLiM consideration for LTO decisions. Extensive analysis and studies of CANDU6 concrete containment structures have already been completed, including an IAEA TECDOC that covers some CANDU containment considerations [I.4]. Typically, a comprehensive PLiM Life Assessment (LA) specific to the individual plant is completed and then […]

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PLiM of MAPS units consequent to failure of moderator inlet manifolds

During 1989, failure of inlet manifolds in both the units MAPS was noticed. The failure was to an extent that the zircaloy inlet manifold got ruptured and its broken pieces were found in the moderator circuit. On internal inspection of calandria, extensive damage to the manifolds was discovered. Under these conditions, it was not possible to operate the reactors. Hence, […]

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Periodic safety review application

In many countries, the safety performance of the NPPs is periodically followed and characterized via the periodic safety review (PSR) approach [24]. The regulatory review and acceptance of the PSR gives the licensee the permission to operate the plant for up to the end of the next PSR cycle (usually 10 years). The regulatory system does not limit the number […]

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COMPONENT SPECIFIC TECHNOLOGY CONSIDERATIONS FOR AGEING

I.1. PLANNING FOR LONG TERM OPERATION Design life for the plant and major components is targeted to be a certain value at the design stage (say 30 Years). Service life, during which components operate safely and reliably, may exceed the design life. This is because the actual operation in terms of say fatigue cycles, corrosion etc., for most of the […]

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