05000454/FIN-2011002-02
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Finding | |
|---|---|
| Title | Self-Revealed Low Flow to Reactor Containment Fan Cooler |
| Description | A self-revealed finding of very low safety significance was identified on January 21, 2011, when licensee personnel failed to ensure that surveillance procedures for measuring essential service water flow through reactor containment fan coolers was adequate. As a result, during routine surveillance testing, measured essential service water flow through the reactor containment fan coolers was less than technical specification requirements. The inspectors concluded that the finding was more than minor because it was associated with the Configuration Control attribute of the Barrier Integrity Cornerstone and affected the cornerstone objective of providing reasonable assurance that physical barriers, including the containment, protect the public from radionuclide releases caused by accidents and events. Specifically, the finding was determined to adversely impact the required technical specification required flow rate of essential service water through the reactor containment fan coolers. The inspectors evaluated the finding using IMC 0609.04, Phase 1 Initial Screening and Characterization of Findings, and based on a No answer to all of the questions in the Barrier Integrity column of Table 4a, determined the finding to be of very low safety significance. This finding had a cross-cutting aspect in the area of Human Performance, Resources (H.2(c)) because the licensee had repeatedly modified the surveillance procedure without ensuring adequate operational margin to the technical specification limit. The licensee entered this issue into the corrective action program and initiated actions to revise the surveillance procedure to raise the as-left essential service water system flow rate. |
| Site: | Byron  |
|---|---|
| Report | IR 05000454/2011002 Section 1R22 |
| Date counted | Mar 31, 2011 (2011Q1) |
| Type: | NCV: Green |
| cornerstone | Barrier Integrity |
| Identified by: | Self-revealing |
| Inspection Procedure: | IP 71111.22 |
| Inspectors (proximate) | R Ng C Thompson B Bartlett J Robbins J Cassidy M Jones E Duncan J Gilliam W Lyon C Tilton J Miller J Whitman |
| CCA | H.7, Documentation |
| INPO aspect | WP.3 |
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Finding - Byron - IR 05000454/2011002 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Byron) @ 2011Q1
Self-Identified List (Byron)
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