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Extra info for Generic Safety Issues for Nuclear Power Plants with PHWR's - IAEA TECDOC-1554

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ATOMIC ENERGY REGULATORY BOARD, safety guide, “Consenting Process for NPPs and Research Reactor” AERB/NPP/SG/G-1. 2 Reactor Core (RC) ISSUE TITLE: Inadvertent dilution or precipitation of poison under low power and shutdown conditions (RC 1) ISSUE CLARIFICATION: Description of issue This issue is also applicable to NPPs with LWR. In some units, during shut down conditions, poison is added to the moderator system to maintain the necessary sub-criticality. During extended shut downs it is required to have purification through ionexchangers.

Many reliability parameters are checked before to be used on PSA, such as: Test frequency, restoration time, average test duration, maintenance unavailability, failure rate and demand failure. Embalse NPP has also a large failure rate data bank recorded during the operating experience (17 years). Canada Recording reliability data is a requirement for special safety systems. Reliability data must be reported as a part of the Annual Reliability Report required by regulatory standard S-99. Realistic and reliable data are among the criteria which would make a PSA suitable for regulatory decision-making.

Improve LOCA handling v. Improving training viz-a-viz the loss of instrument air initiating event vi. Increasing the charging tank capacity of the coolant vii. Installing a third Diesel generator with capability to provide redundancy on running failures of existing two diesels As part of PSA application project, KANUPP plans to carry out improvement based on the above recommendations in two phases: • First phase, including items (i) to (iii), (v) & (vi), has been completed in the year 2003. After Phase-II, it is expected that the CDF will reduce to 5E-4 per year.

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Generic Safety Issues for Nuclear Power Plants with PHWR's - IAEA TECDOC-1554

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