05000321/FIN-2012002-03
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Finding | |
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| Title | Licensee-Identified Violation |
| Description | A licensee-identified violation was discovered on April 16, 2011, for Unit 2 TS 3.6.1.1 which states that primary containment shall be operable during Modes 1, 2 and 3. TS 5.5.12 requires primary containment overall leakage rate acceptance criteria be less than or equal to La (allowable leakage). Contrary to this requirement, on April 16, 2011, the licensee discovered during the Unit 2 refueling outage that primary containment isolation valves 2T48-F309 and 2T48-F324 exceeded the as-found local leak rate requirements and resulted in an overall leak rate through penetration 2T23X205 greater than La. The inspectors screened the significance of this violation using IMC 0609 Appendix H. The Appendix H Phase 2 screening results required a more detailed analysis by an NRC senior risk analyst (SRA). A regional SRA reviewed the Appendix H Phase 2, and requested that NRC headquarters risk analysts perform an analysis to determine the impact of the finding given the potential for scrubbing of the fission products prior to release. The analysts used NUREG-1765, and concluded that this was a Type B LERF finding which involves leakage through the torus and not a drywell bypass. Section 3.2.1 of NUREG-1765 states that for such cases, fission product scrubbing through the suppression pool can be credited and that this type of finding does not contribute significantly to LERF. Therefore, the finding is GREEN. Corrective actions taken by the licensee included repairs to valves 2T48-F309 and 2T48-F324 and satisfactory post-maintenance testing to verify leakage was within limits prior to plant restart. This issue was captured in the licensees corrective action program as CR 2011105213 and was documented in LER 05000366/2011-001. |
| Site: | Hatch  |
|---|---|
| Report | IR 05000321/2012002 Section 4OA7 |
| Date counted | Mar 31, 2012 (2012Q1) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | Licensee-identified |
| Inspection Procedure: | |
| Inspectors (proximate) | E Morris M Coursey C Dykes D Hardage F Ehrhardt |
| INPO aspect | |
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Finding - Hatch - IR 05000321/2012002 | |||||||||||||||||||||||||||||||||||||
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Finding List (Hatch) @ 2012Q1
Self-Identified List (Hatch)
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