05000390/FIN-2011003-04
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Finding | |
|---|---|
| Title | Failure to Translate Moderate Energy Line Break Study Output into a Plant Procedure |
| Description | The inspectors identified an NCV of 10 CFR Part 50, Appendix B, Criterion III, Design Control for the licensees failure to correctly translate a design document into operating procedures. Specifically, from original Licensing until the beginning of this reporting period, the licensee failed to translate into procedures guidance that would ensure that the plant could be safely shut down following a non-isolable break in the piping connecting the refueling water storage tank (RWST) to the emergency core cooling system in the auxiliary building. The licensee entered this issue into the corrective action program as PER 341568 and corrective actions have been completed to address the issue. This finding was determined to be more than minor because it adversely affected the Mitigating Systems cornerstone attribute of procedure quality and affected the cornerstone objective of ensuring the availability and reliability of systems that respond to initiating events to prevent undesirable consequences. Specifically, flood protection was degraded due to a lack of procedures to mitigate flooding from the RWST into the auxiliary building with accompanying damage to both trains of the containment spray motors. This finding was evaluated using the SDP Phase 1 screening criteria in accordance with IMC 0609, Attachment 4, and was determined to require a Phase 3 analysis. The phase 3 analysis was performed by regional SRAs and determined to be of very low safety significance. The cause of the finding extends back to original plant licensing. Therefore, it is not related to current performance and is not assigned a cross-cutting aspect. |
| Site: | Watts Bar  |
|---|---|
| Report | IR 05000390/2011003 Section 1R06 |
| Date counted | Jun 30, 2011 (2011Q2) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71111.06 |
| Inspectors (proximate) | R Monk R Hamilton W Loo E Guthrie M Coursey K Miller |
| INPO aspect | |
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Finding - Watts Bar - IR 05000390/2011003 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Watts Bar) @ 2011Q2
Self-Identified List (Watts Bar)
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