05000482/FIN-2009004-05
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Finding | |
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| Title | Use of Nonsafety-Related Power to Ensure Operability of Safety-Related Boric Acid System |
| Description | The inspectors identified a noncited violation of 10 CFR 50 Appendix B, Criterion III, Design Control, for failing to translate the boric acid design basis into procedures that ensure time sensitive operator actions are completed to achieve the core shutdown margin specified in the core operating limits report. Performance Improvement Request 2005-3461 identified that if the room coolers were started while lake temperature was low, the boric acid solution temperature may decrease below the solubility limit. Corrective actions for heat tracing and room temperature logging took approximately 3 years to implement and stopped short of addressing boric acid system operation when nonsafety power is lost to the heat tracing and the plant must be taken to cold shutdown in accordance with technical specifications. The licensee entered this issue in their corrective action program as Condition Report 20717. The failure to translate the design bases into procedures that ensure the function of the safety-related boric acid system upon loss of nonsafety-related heat tracing is a performance deficiency. The inspectors determined that this finding was more than minor because this issue aligned with Inspection Manual Chapter 0612, Appendix E, example 2.f, because the pipe temperature was required to stay above the boric acid solubility limit and the loss of the heat tracing and or room temperature decrease will block the boric acid system. This issue was associated with the equipment performance attribute of the mitigating systems cornerstone and affected the cornerstone objective to ensure the availability, reliability, and capability of systems that respond to initiating events. The inspectors evaluated the significance of this finding using Phase 1 of Inspection Manual Chapter 0609, Appendix A, Significance Determination of Reactor Inspection Findings for At Power Situations, and determined that the finding screened to phase 2 because the issue was a design or qualification deficiency confirmed to result in loss of operability or functionality The inspectors evaluated the significance of this finding using Phase 2 of Inspection Manual Chapter 0609, Risk Informed Inspection Notebook for Wolf Creek Generating Station, and determined that the finding was of very low safety significance because loss of the boric acid system in Table 3.9 for one year resulted in a 1E-7 CDF when giving recovery credit for the refueling water storage tank. The inspectors determined that this finding has a crosscutting aspect in the area of problem identification and resolution associated with the corrective action program component because Wolf Creek did not take appropriate corrective actions to resolve known deficiencies in the design and operation of the boric acid system for approximately 4 years. The issue was re-evaluated in 2009, and the licensee failed to correct the deficiencies identified in 2005. P.1.d] (Section 1R18) |
| Site: | Wolf Creek  |
|---|---|
| Report | IR 05000482/2009004 Section 1R18 |
| Date counted | Sep 30, 2009 (2009Q3) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71111.18 |
| Inspectors (proximate) | C Long C Peabody C Ryan G Apger G Miller G Tutak J Adams P Jayroe S Alferinkc Longc Peabody G Miller G Werner M Shannon N O'Keefe P Jayroe R Kellar S Garchow |
| CCA | P.3, Resolution |
| INPO aspect | PI.3 |
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Finding - Wolf Creek - IR 05000482/2009004 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Wolf Creek) @ 2009Q3
Self-Identified List (Wolf Creek)
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