05000390/FIN-2011005-04
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Finding | |
|---|---|
| Title | Inadequate Procedures for Identifying Accumulated Gas in ECCS Systems |
| Description | The inspectors identified a Green non-cited violation (NCV) of 10 CFR Part 50, Appendix B, Criterion V, Instructions, Procedures, and Drawings, for the licensees failure to establish adequate procedures to identify accumulated gas in emergency core cooling systems (ECCS). Specifically, the operations surveillance test procedures, 1-SI-63-10.1-A, ECCS Discharge Pipes Venting Train A Inside Containment, Rev 1 and 1-SI-63-10.2-A, ECCS Discharge Pipes Venting Train A Outside Containment, Rev 1, could allow accumulated gases inside ECCS to be vented without being quantified and evaluated for potential adverse impacts on system operability. The licensee entered this in their corrective action program as PER 478095. The inspectors determined that the licensees failure to establish adequate procedures to identify accumulated gas in ECCS was a performance deficiency (PD). The PD was more than minor because if left uncorrected, the PD had the potential to lead to a more significant safety concern. Specifically, if left uncorrected the potential existed for an unacceptable void that could affect ECCS operability to remain undetected. The inspectors screened this finding in accordance with Inspection Manual Chapter (IMC) 0609, Significance Determination Process, Attachment 4, Phase 1 - Initial Screening and Characterization of Findings, and determined the finding was of very low safety significance (Green) since it did not represent the loss of any system safety function and it did not screen as potentially risk significant due to seismic, flooding or severe weather. The inspectors determined that the finding has a cross-cutting aspect in the area of human performance, because the licensee did not have accurate procedures to measure gas vented from ECCS systems in order to determine if gas voids existed which could impact ECCS system operability |
| Site: | Watts Bar  |
|---|---|
| Report | IR 05000390/2011005 Section 4OA5 |
| Date counted | Dec 31, 2011 (2011Q4) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | |
| Inspectors (proximate) | S Shaeffer P Higgins R Baldwin K Miller W Deschaine N Childs R Monk |
| CCA | H.7, Documentation |
| INPO aspect | WP.3 |
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Finding - Watts Bar - IR 05000390/2011005 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Watts Bar) @ 2011Q4
Self-Identified List (Watts Bar)
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