05000327/FIN-2008003-03
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Finding | |
|---|---|
| Title | Licensee-Identified Violation |
| Description | 10 CFR 50.65(a)(4) requires the licensee to assess and manage increases in risk resulting from maintenance. Procedure SPP-7.2, Outage Management, Revision 10, implemented risk management reviews during outage periods and required that a risk assessment should be reperformed when emergent conditions exist which could change the conditions of a previously performed risk assessment. Contrary to this, on May 8, 2008, a shear pin failed on the fuel transfer tube wafer valve 2-VLV-78- 610, which prevented achieving containment closure had it been required. This emergent condition resulted in an escalation in risk from a Yellow threshold to an Orange threshold; however, a risk assessment was not reperformed. The risk condition change was not recognized prior to the licensee performing maintenance, specifically detensioning the reactor vessel head and entering Mode 6. The licensee replaced the failed shear pin and reestablished containment closure capability. Following repairs, the licensee realized that an elevated risk condition resulted from the shear pin failure, and this had not been reevaluated as required. The issue was entered into the corrective action program as PER 144542. This finding was determined to be of very low safety significance (Green) because of the short duration of the condition and the number and nature of risk management actions already in place |
| Site: | Sequoyah  |
|---|---|
| Report | IR 05000327/2008003 Section 4OA7 |
| Date counted | Jun 30, 2008 (2008Q2) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | Licensee-identified |
| Inspection Procedure: | |
| Inspectors (proximate) | E Michel W Loo E Guthrie C Young S Freeman M Speck L Suggs |
| INPO aspect | |
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Finding - Sequoyah - IR 05000327/2008003 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Sequoyah) @ 2008Q2
Self-Identified List (Sequoyah)
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