05000443/FIN-2011004-02
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Finding | |
|---|---|
| Title | Licensee-Identified Violation |
| Description | TS LCO 3.4.6.1, RCS Leakage Detection Systems, requires three leakage detection systems be operable, including a containment sump level monitoring system, a containment atmosphere particulate radiation monitoring system and a containment atmosphere gaseous radiation monitoring system. The TS allow plant operation for up to thirty days with one leakage detection system inoperable, and requires a plant shutdown in 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> if more than one leakage detection system is inoperable. Contrary to the above, Seabrook operated for greater than 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> on October 5, 2010, December 15, 2010, January 4, 2011 and March 10, 2011, with both particulate and gaseous radiation monitors inoperable. On each occasion, RM6548 was credited for RCS leakage detection for more than 6 but less than 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />. The finding affected the Initiating Events cornerstone in that a system used to identify reactor coolant system leakage might not have been functional following a operational basis earthquake. The backup gas monitor remained functional but lacked full qualification, as described in Section 40A3 above. This finding is of very low safety significance (Green) per IMC 0609 because the issue did not result in a total loss of safety function and did not contribute to both a transient initiator and the likelihood that mitigating functions would be unavailable. Since the issue is of very low safety significance and was entered into the corrective action program as AR 1633042, the issue is considered a licenseeidentified, non-cited violation (NCV) consistent with Section 2.3.2.a of the NRC Enforcement Policy. |
| Site: | Seabrook  |
|---|---|
| Report | IR 05000443/2011004 Section 4OA7 |
| Date counted | Sep 30, 2011 (2011Q3) |
| Type: | NCV: Green |
| cornerstone | Initiating Events |
| Identified by: | Licensee-identified |
| Inspection Procedure: | |
| Inspectors (proximate) | T Moslak J Richmond W Raymond A Burritt J Johnson E Keighley J Deboer B Dionne |
| INPO aspect | |
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Finding - Seabrook - IR 05000443/2011004 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Seabrook) @ 2011Q3
Self-Identified List (Seabrook)
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