05000482/FIN-2011002-14
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Finding | |
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Title | Licensee-Identified Violation |
Description | Technical Specification Table 3.3.2.1, function 8.a, requires two trains of the P-4 interlock to be operable in Modes 1, 2, and 3. Function 8.a does not provide a required action for both trains of engineered safety features actuation system interlocks inoperable. Wolf Creek Technical Specification 3.0.3 requires the plant to be in Mode 4 within 13 hours1.50463e-4 days <br />0.00361 hours <br />2.149471e-5 weeks <br />4.9465e-6 months <br /> when there is no required action specified for a limiting condition of operation that cannot be met. Contrary to the above, with both channels of the P-4 input to the Turbine Trip function defeated in Mode 3, Wolf Creek did not take action to place the unit in Mode 4 on November 6-8, 2006, May 10, 2008, April 30, 2009, and November 18, 2009. 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 could not be performed using the Risk Informed Inspection Notebook for Wolf Creek Generating Station since the pre-solved worksheet did not address the P-4 interlock. Using a Phase 3 analysis, a senior reactor analyst calculated the core damage probability to be less than 1E-7 per year, or of very low safety significance (Green). This issue was entered in the licensees corrective action program as Condition Report 23108. |
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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