05000336/FIN-2009002-02
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Finding | |
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Title | Containment Penetration Not Fully Closed During Fuel Movement |
Description | The inspectors reviewed the LER and Dominions apparent cause evaluation of the event. The inspectors determined that the failure to completely close valve 3FWS*V861 was not within Dominions ability to foresee and correct and was not a performance deficiency. Valve 3FWS*V861 does not have position indication. The operator who closed the valve and the operator who performed the independent verification did not have an alternate means to verify that the valve was completely closed. Additionally, when the valve was identified to be leaking while filling the SG, it was only able to be completely closed when mechanical leverage was applied. A review of previous work orders (WOs) revealed that the valve was replaced like for like in 2007 due to seat leakage. A different packing was used which required more force to consolidate. Also, the packing gland was torqued per procedure when, previously, the packing was tightened using good mechanical practices. Because of these changes, more force would be required to operate the valve; however, there was no indication in the 2007 WO that the valve was difficult to operate. A review of the CRs associated with this valve did not indicate any previous problems in operating the valve. Because of these details, the inspectors concluded that the inability to fully close valve 3FWS*V861 could not have reasonably been avoided or detected by Dominions quality assurance program or other related control measures. The inspectors also performed a Phase1 SDP analysis and determined the violation to be of very low safety significance (Green). Dominions corrective actions included closing the valve, entering the issue into their corrective action process (CR 117527), changing the position verification procedure to specify physical verification versus visual, and plans to modify the valve during the next refueling outage to improve the stroking function. Therefore, in accordance with Section VII.B.6 of the Enforcement Policy, the NRC has chosen to exercise enforcement discretion and not issue a violation for this issue. |
Site: | Millstone ![]() |
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Report | IR 05000336/2009002 Section 4OA3 |
Date counted | Mar 31, 2009 (2009Q1) |
Type: | Violation: Green |
cornerstone | Mitigating Systems |
Identified by: | NRC identified |
Inspection Procedure: | IP 71153 |
Inspectors (proximate) | J Krafty S Shaffer T Moslak B Haagensen D Lew |
INPO aspect | |
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Finding - Millstone - IR 05000336/2009002 | |||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Millstone) @ 2009Q1
Self-Identified List (Millstone)
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