05000482/FIN-2012003-03
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Finding | |
|---|---|
| Title | Licensee-Identified Violation |
| Description | On January 31, 2012, Wolf Creek identified that in-service inspection for the second 10-year period were missed for two valves. Valves BB8379A and BB8379B are chemical and volume control system alternate charging check valves to reactor coolant system loop four. Both are ASME Code Class 1 valves. In 1987, valve BB8379B had a leak at the body-to-bonnet joint and its studs were re-torqued. The valve continued to leak a small amount. Subsequently, valves BB8379A and BB8379B each had a seal cap, or leakage control device, installed on December 9, and 28, 1987, respectively.0 Title 10 CFR 50.55a(g)(4) requires licensees to follow the pressure test requirements of the ASME Code Section XI. ASME Code,Section XI, IWA-5240, requires visual examinations as part of system pressure tests. ASME Code Section XI, IWA-5242, 1998 Edition through 2000 addenda, requires pressure retaining bolted connections for VT-2 visual examinations in borated water systems. Contrary to the above, from September 3, 1995, to the present, Wolf Creek did not perform a visual inspection of the valve body-to-bonnet studs. This finding was more than minor because it impacted the Initiating Events Cornerstone and its attribute of equipment performance. Specifically, it affected the objective to limit the likelihood of those events that upset plant stability and challenge critical safety functions during shutdown as well as power operations. Using Inspection Manual Chapter 0609, Appendix A, The Significance Determination Process (SDP) for Findings At-Power, this finding was determined to be of very low safety significance because an evaluation was able to demonstrate structural integrity. Specifically, stud stress was not sufficiently close to the yield stress to cause a loss of integrity. Therefore, the finding does not contribute to both the likelihood of a reactor trip and the likelihood that mitigation equipment will not be available. The licensee has entered this issue into their corrective action program as condition reports 48493 and 48494. Wolf Creek planned to remove the seal caps and perform the inspection in the next refueling outage. |
| Site: | Wolf Creek  |
|---|---|
| Report | IR 05000482/2012003 Section 4OA7 |
| Date counted | Jun 30, 2012 (2012Q2) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | Licensee-identified |
| Inspection Procedure: | |
| Inspectors (proximate) | C Long C Peabody C Alldredge N Greene N Makris A O'Donnell L Ricketson L Carson N O'Keefe |
| INPO aspect | |
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Finding - Wolf Creek - IR 05000482/2012003 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Wolf Creek) @ 2012Q2
Self-Identified List (Wolf Creek)
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