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

Combined approach with PSR and LRA

As there is no legal or administrative limitation as regards the establishment of the operating life of NPPs, with consequently no fixed operation period established, the NPP operating licenses/permits are renewed periodically through on-going assessments and PSRs. The PSRs provide a global evaluation of the plant safety (including the analysis of aspects such as compliance with the standards in force, […]

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PRESSURE TUBES

Extensive analysis and studies of fuel channels have already been completed, including a TECDOC on HWR pressure tubes [I.1]. Comprehensive PLiM for pressure tubes are established for inspection and maintenance to ensure plant life attainment. These plans are updated periodically (typically every 3-4 years) as part of the plant life management programme for this component.

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SSC operation/use

NPP operation has a significant influence on the rate of degradation of SSCs. Exposure of a SSC to operating conditions (e. g. temperature, pressure, water chemistry) outside prescribed operational limits could lead to accelerated ageing and premature SSC degradation affecting plant safety and availability. In particular, it is prudent to attempt to control the operating environment of inaccessible SSCs where […]

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EARLY INITIATION OF PLANT LIFE MANAGEMENT PROGRAMME. EXPERIENCE AT CERNAVODA UNTIT 1

Cernavoda Unit 1 which is a newer plant having been in operation only since December 1996, started recently the development of Plant Life Management (PLiM) Programme. Due to its complexity, the programme plan has been divided in several subprogrammes and pilot projects and integrated with other initiatives for improvement in the long term strategy of Cernavoda NPP (2004-2008), and managed […]

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Training and re-training — Knowledge management

Training and retraining based on knowledge management is necessary to ensure that NPP personnel remain highly qualified to do their tasks. Programmes for initial and upgrades in training, including the use of simulators should be in place. These should also include the following aspects: Training in safety culture, particularly for management staff, the adoption of a questioning attitude, etc.

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TYPICAL PROACTIVE STEAM GENERATOR AGE MANAGEMENT STRATEGY FOR LONG TERM OPERATION

Despite the excellent record at CANDU6 NPPs, it is well known that steam generators provide challenges for the assurance of continued good health, through to design life and particularly for a significant period of extended operation. This includes components other than the tube bundle, which typically has been the most-inspected component to date. Many important secondary side internal components are […]

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IMPLEMENTATION OF LIFE MANAGEMENT PROGRAMME

The Periodic Safety Review normally sets the implementation schedule of recommended improvements. The safety significance, PSA, techno-economic considerations govern the implementation plan. However, the older plants up to KAPS 1 had used Zircaloy2 pressure tubes in the original design. The en-masse pressure tube replacement period is being used in a big way to implement major retrofitting jobs. RAPS 2, MAPS […]

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DEFINITION OF TERMINOLOGY

The following IAEA terminology and definitions have been adopted throughout the TECDOC: • Ageing is defined as the continuous time dependent degradation of SSC-materials due to normal service conditions, which include normal operation and transient conditions; postulated accident and post-accident conditions are excluded. It is emphasized here that ageing is a wide term, and may even be extended to include […]

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