05000456/FIN-2014003-03
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Finding | |
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| Title | Corrective Actions to Address NCV 05000456/2012005-01; 05000457/2012005-01, "Failure to Maintain Watertight Door Safety Function After Routine Passage" |
| Description | The inspectors identified an unresolved item (URI) associated with the licensees corrective actions to address NCV 05000456/201200501; 05000457/201200501, Failure to Maintain Watertight Door Safety Function After Routine Passage. Description: As discussed in NRC Integrated Inspection Report 05000456/2012005; 05000457/2012005, a Green finding and associated NCV of 10 CFR 50, Appendix B, Criterion V, Instructions, Procedures, and Drawings, was identified after the inspectors determined that the licensees guidance that permitted operators to leave the diesel oil storage tank (DOST) room watertight flood doors open and unattended for up to 15 minutes to perform tours, inspections, walkdowns, sampling, or other routine tasks in the DOST rooms was inappropriate. The licensee addressed this NCV by revising the guidance that allowed the doors to be left open and unattended. During this inspection period, the inspectors became aware that the licensee re-revised the guidance to again allow the DOST doors to be open for longer than the time needed for routine passage based upon a change to the current licensing basis that eliminated the consideration of a circulating water system line break as an initiating event. The inspectors reviewed the licensees corrective actions and associated 10 CFR 50.59 evaluation that implemented this change and determined that the 10 CFR 50.59 failed to evaluate: An individual who failed to shut one of the watertight flood doors upon identification of a turbine building internal flooding event. Specifically, if an individual failed to shut one of the flood doors, then a loss of safety function could occur because the barrier separating the two DOST rooms was not designed as a flood barrier and both trains of DOST transfer pumps could become submerged, a condition that the equipment is not qualified for. Depending upon the flooding event, stress could potentially affect the overall success of a plant workers required action to close the DOST watertight door. If the DOST flood doors were seismically qualified in the open position. Particularly, the licensee had not evaluated if the DOST flood doors could still be shut following a design basis loading event (e.g., safe shutdown earthquake). If any of the Safety Category II SSCs could fail or fail in a manner that prevented an open DOST flood door from shutting. Based on the above, the inspectors questioned whether the EDG fuel oil transfer system could have been considered operable with the DOST flood doors open and unattended for any period of time other than routine passage. At the end of the inspection period, the licensee had not completed their 10 CFR 50.59 review. Therefore, this URI will remain open pending the licensees completion of that review and additional inspector review. (URI 05000456/201400303; 05000457/201400303, Corrective Actions to Address NCV 05000456/201200501; 05000457/201200501, Failure to Maintain Watertight Door Safety Function After Routine Passage) |
| Site: | Braidwood  |
|---|---|
| Report | IR 05000456/2014003 Section 4OA2 |
| Date counted | Jun 30, 2014 (2014Q2) |
| Type: | URI: |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71152 |
| Inspectors (proximate) | B Metrow D Betancourt E Duncan J Benjamin J Mancuso M Holmberg N Mcmurray T God Betancourte Duncan F Ramirez J Benjamin M Perry T Bilik T Go |
| INPO aspect | |
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Finding - Braidwood - IR 05000456/2014003 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Braidwood) @ 2014Q2
Self-Identified List (Braidwood)
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