4Q/2011 ROP Performance Indicators Summary
Crystal River has been shut down since October 2009, and Fort Calhoun has been shutdown since April 2011. Because the Unplanned Scrams with Complications (USwC) and Mitigating Systems Performance Index (MSPI) performance indicators (PIs) are heavily influenced by the operational status of the reactor, NRC staff has evaluated the validity of these PIs. Because the Crystal River and Fort Calhoun reactors have not been critical for at least six months, there have been no recent opportunities for a scram that would count in the USwC indicator. Similarly, the MSPI values can become skewed because of the very low number of critical hours. For these reasons, the staff has determined that these PIs no longer provide valid indications of performance. The shutdown conditions are also causing other indicators at these sites to be invalid, in accordance with NEI 99-02. The NRC and NEI are discussing generic PI validity criteria during the public ROP working group meetings.
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Last modified : February 02, 2012