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Operational Safety Performance Indicators for Nuclear

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The team reviewed each indicator and prepared a plant specific definition. The monitoring durations were also established. After the team reviewed the indicators in a given attribute, the draft was discussed by the team members and the project co-ordinator. The definitions were modified where required, and a final draft was prepared. It was foreseen that these definitions could undergo a change during the indicator evaluation phase. This task was one of the most challenging, as it had to be ensured that the indicators would be meaningful for the plant.

Internal initiating events are hardware failures in the plant or faulty operations of plant hardware through human error or computer software deficiencies. Internal hazards include internal flooding, fire and missile impact (IAEA Safety Series No. 50-P-4). 29 0RQLWRULQJ DQG UHSRUWLQJ LQFUHDVHV LQ LQLWLDWLQJ HYHQW IUHTXHQFLHV WRJHWKHU ZLWK GDLO\ JOREDO FKDQJHV LQ FRUH GDPDJH IUHTXHQF\ SURYLGH D PRUH FRPSOHWH XQGHUVWDQGLQJ RI SODQW ULVN ,,±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¶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± +2: 72 2%7$,1 5,6.

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