05000461/FIN-2016003-06
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Finding | |
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| Title | Licensee-Identified Violation |
| Description | The following violation of very low significance (Green) was identified by the licensee and is a violation of NRC requirements which meets the criteria of the NRC Enforcement policy for being dispositioned as an NCV. Clinton Technical Specification 3.3.2.1, Control Rod Block Instrumentation requires the control rod block instrumentation for each Function in Table 3.3.2.11 shall be operable. If one or more rod withdrawal limiter (RWL) channels is inoperable, the required action is to suspend control rod withdrawal. The completion time for the action is immediately. Contrary to the above, on April 13, 2016, both RWL channels became inoperable and the required action to immediately suspend control rod withdrawal was not completed. Specifically, on April 13, 2016, operations lowered reactor power below the control rod withdrawal limiter high power set point to remove the B turbine driven reactor feed pump from service for repairs. Technical Specification Surveillance Requirement 3.3.2.1.2 requires a functional test of the 4-notch control rod withdrawal limit of the RWL within one hour of resetting the high power set point during power reduction if it has not been completed within the previous 92 days. The surveillance was last performed on April 25, 2015, making the RWL channels inoperable below the high power set point. The licensee subsequently withdrew control rods to restore reactor power above the high power set point with the RWL channels inoperable. The licensee discovered the missed surveillance on April 21, 2016, in preparations for lowering reactor power to place the B turbine driven reactor feed pump into service after repairs. The surveillance was successfully performed after lowering power below the RWL high power set point. The licensee entered the issue into the CAP as AR 02659195. The issue was determined to be more than minor because the performance deficiency affected equipment performance attribute of the mitigating systems cornerstone objective to ensure the availability, reliability and capability of systems that respond to initiating events to prevent undesirable consequences. The finding was screened using IMC 0609, Attachment 4, Initial Characterization of Findings, and Appendix A, The Significance Determination Process for Findings at Power, issued June 19, 2012, the finding was screened against the Mitigating Systems cornerstone and determined to be of very low safety significance (Green) because the finding did not affect a single reactor protection system trip signal to initiate a reactor scram, did not involve control manipulations that unintentionally added positive reactivity or result in a mismanagement of reactivity by operators. |
| Site: | Clinton  |
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| Report | IR 05000461/2016003 Section 4OA7 |
| Date counted | Sep 30, 2016 (2016Q3) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | Licensee-identified |
| Inspection Procedure: | |
| Inspectors (proximate) | C Phillips G Edwards G Roach J Bozga J Wojewoda K Stoedter N Fields S Mischke W Schaup |
| Violation of: | Technical Specification |
| INPO aspect | |
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Finding - Clinton - IR 05000461/2016003 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Clinton) @ 2016Q3
Self-Identified List (Clinton)
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