05000482/FIN-2012004-07
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Finding | |
|---|---|
| Title | Licensee-Identified Violation |
| Description | On April 30, 2011, Wolf Creek identified a non-cited violation of Technical Specifications 3.0.4 and 3.9.3 for entry into Mode 6 with an inoperable source range neutron detector. On April 30, 2011, operators channel checked the nuclear instrumentation source range detectors SEN0031 and SEN0032 count rate using procedure STS CR-002. On April 30, 2011, Mode 6 was entered from defueled condition. At that time operators believed that both source range detectors were operable. When a bundle of fuel was brought in close proximity to source range detector SEN0031, the operators did not observe the expected response from the detector. Refueling operations were suspended, the detector declared inoperable and the problem investigated. A pulse shaper circuit card was found failed and replaced. Failure to maintain two operable source range detectors prior to entering Mode 6 from a defueled condition was a performance deficiency. Wolf Creek has since changed its procedures to use the plant computer to trend source range indications for channel checks prior to entering Mode 6. The performance deficiency was more than minor because it impacted the Mitigating Systems Cornerstone objective to ensure availability, reliability, and capability of systems that respond to initiating events to prevent undesirable consequences. The significance of the finding was determined using Inspection Manual Chapter 0609, Significance Determination Process, Appendix G, checklist 3, and determined to be of very low safety significance (Green), because it did not cause the loss of mitigating capability of core heat removal, inventory control, power availability, containment control, or reactivity control. Wolf Creek Generating Stations Technical Specification 3.0.4 requires, in part, entry into a Mode shall only be made when the limiting conditions of operation be met prior to changing modes. Technical Specification 3.9.3 requires, in part, that both source range nuclear instruments be operable in Mode 6. Contrary to the above, on April 30, 2011, Wolf Creek entered Mode 6 with one source range instrument inoperable. Since the finding is of very low safety significance, was identified by Wolf Creek, and has been entered into the licensees corrective action program as condition report 38465, this violation is being treated as a non-cited violation consistent with Section 2.3.2 of the NRC Enforcement Policy. |
| Site: | Wolf Creek  |
|---|---|
| Report | IR 05000482/2012004 Section 4OA7 |
| Date counted | Sep 30, 2012 (2012Q3) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | Licensee-identified |
| Inspection Procedure: | |
| Inspectors (proximate) | C Long C Peabody C Speer G Guerra J Laughlin J Watkins L Ricketson N Greene N Makris N O'Keefe R Kopriva S Hedger |
| INPO aspect | |
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Finding - Wolf Creek - IR 05000482/2012004 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Wolf Creek) @ 2012Q3
Self-Identified List (Wolf Creek)
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