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This guidance should be sufficiently general in nature so that all reactor types can use the methodology, and detailed enough to ensure that all relevant initiating events are identified. , decay heat should not change significantly during the POS and neither should plant equipment availabilities). To this end, a standardized methodology for defining plant operational states should be adopted. This standard should be developed to minimize differences in results for plants that are similar. However, the method should be flexible enough to allow the identification of plant unique operational differences.

The recent safety studies also indicate that shutdown safety is to a large extent a configuration control issue. Among the countries and plants that discussed their activities on the topic at the recent meeting, there are different approaches to administrative limitations during shutdown. These depend both on the reactor type and on the overall safety culture in a given country. 1. Limits and conditions Most of the plants have considered some review relevant to shutdown operations and/or additions to their limits and conditions.

This team should co-ordinate daily activities, with a focus on safety requirements and safety systems availability. The team should be headed by an expert with shift supervisor experience and/or license. 4. Administrative measures The shutdown mode was traditionally considered a safe reactor state. As a result, very little administrative control was implemented for shutdown operations. Moreover, outage scheduling was in most cases centered on maintenance activities with less regard for available redundancies, work authorization, systems testing and housekeeping.

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Safety Anal of Nucl Powerplants - Low-Pwr and Shutdown Cond (IAEA TECDOC-1042)

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