05000482/FIN-2011002-12
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Finding | |
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Title | Licensee-Identified Violation |
Description | Technical Specification 3.3.2, Table 1, Engineered Safety Feature Actuation System Instrumentation, function 6.g., requires, in part, two operable channels of auxiliary feedwater actuation upon trip of all main feedwater pumps in modes 1 and 2. There is no specified required action for two inoperable channels, so limiting condition for operation 3.0.3 is applicable. Limiting condition for operation 3.0.3 requires action to be initiated within 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> to place the plant in mode 3 in 7 hours8.101852e-5 days <br />0.00194 hours <br />1.157407e-5 weeks <br />2.6635e-6 months <br />. Contrary to the above, on January 20, 2010, Wolf Creek identified that at various times, the actuation logic function 6.g. for auxiliary feedwater had been inoperable and that the licensee had failed to initiate action within 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> to place the unit in mode 3 in 7 hours8.101852e-5 days <br />0.00194 hours <br />1.157407e-5 weeks <br />2.6635e-6 months <br />. Specifically, the actuation logic could not be made up with one main feedwater pump operating and the second main feedwater pump secured and reset. This condition occurred during unit startups and shutdowns. This finding was entered in the licensees corrective action program as Condition Report 23008. Using Inspection Manual Chapter 0609.04, Phase 1 Initial Screening and Characterization of Findings, the issue screened to a Phase 2 significance determination because it involved an actual loss of safety function. A Phase 2 significance determination using the pre-solved worksheet from the Risk Informed Inspection Notebook for Wolf Creek Generating Station, determined the finding was of very low safety significance (Green) because this feature was not credited in the plants safety analysis and the auxiliary feedwater safety function was still available. |
Site: | Wolf Creek |
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Report | IR 05000482/2011002 Section 4OA7 |
Date counted | Mar 31, 2011 (2011Q1) |
Type: | NCV: Green |
cornerstone | Mitigating Systems |
Identified by: | Licensee-identified |
Inspection Procedure: | |
Inspectors (proximate) | G Guerra C Smith L Carson G Miller B Tindell C Long C Peabody A Fairbanks D Reinert C Alldredge |
INPO aspect | |
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Finding - Wolf Creek - IR 05000482/2011002 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Wolf Creek) @ 2011Q1
Self-Identified List (Wolf Creek)
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