05000346/FIN-2010002-05
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Finding | |
|---|---|
| Title | Potential Missed Reporting Requirement for Inoperable Containment Air Coolers |
| Description | The inspectors determined that the licensees classification that both trains of containment air coolers were inoperable was potentially classifiable under 10 CFR 50.72(b)(3)(v) and 50.73(a)(2)(v) as an event or condition that could have prevented fulfillment of a safety function. The failure to report a safety system function failure caused by relay misapplication is considered a URI pending further review by the licensees staff and the inspectors. On October 13, 2009, the licensee identified that they had misapplied Potter and Brumfield Rotary Relays in the control circuitry of their containment air coolers and that this misapplication potentially affected the ability of the coolers to automatically switch from the normal high speed fan operation to post-ECCS actuation low speed fan operation. The licensee manually switched the fans to slow speed operation and declared the coolers operable. The inspectors reviewed the event and determined that the misapplication of the relays was a finding which was documented in Inspection Report 05000346/2009005 as NCV 05000346/2009005-03. On December 14, 2009, the licensee submitted LER 2009-001 in accordance with 10 CFR 50.73(a)(2)(i)(B) as an operation or condition prohibited by the TSs. The inspectors review of the LER determined that with both trains of containment air coolers the event was potentially classifiable under 10 CFR 50.72(b)(3)(v) and 50.73(a)(2)(v) as an event or condition that could have prevented fulfillment of a safety function. This inspectors potential classification was discussed with licensee personnel and with NRC sections involved in reviewing classifications of LERs. At the end of the inspection period, the licensee and the inspectors had not completed their review of the data associated with classification of this event. Pending further review of the licensees evaluation and supporting documentation by the inspectors to determine if this constitutes a failure to report a safety system functional failure, the issue is considered a URI 05000346/20100002-05, Potential Missed Reporting Requirement for Inoperable Containment Air Coolers) |
| Site: | Davis Besse  |
|---|---|
| Report | IR 05000346/2010002 Section 4OA5 |
| Date counted | Mar 31, 2010 (2010Q1) |
| Type: | URI: |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | |
| Inspectors (proximate) | M Marshfield J Rutkowski A Wilson D Kimble T Go J Cameron P Vossj Cassidyd Melendez-Colon J Rutkowski D Jones A Wilson T Go J Cameron P Voss |
| INPO aspect | |
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Finding - Davis Besse - IR 05000346/2010002 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Davis Besse) @ 2010Q1
Self-Identified List (Davis Besse)
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