05000259/FIN-2009006-01
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Finding | |
|---|---|
| Title | Standby Gas Treatment Subsystem A Inoperable Beyond the Technical Specification Allowed Outage Time |
| Description | A Green, self-revealing, non-cited violation (NCV) of Technical Specification (TS) limiting condition for operation (LCO) 3.6.4.3, Standby Gas Treatment (SGT) System, was identified for the licensees failure to comply with the LCO required actions for one inoperable SGT subsystem due to an inadequate investigation to ensure the systems operability, on November 30, 2008, following a loss of power to one of the three relative humidity heaters. This issue was entered into the corrective action program as Problem Evaluation Report 174597. The cause of the failure of the heater was a failed relay. The relay was replaced and the system was restored to service on June 20, 2009. The finding is similar to example 2a in Inspection Manual Chapter (IMC) 0612, Appendix E, Examples of Minor Issues, in that the example performance deficiency is not minor if Technical Specification limits were exceeded. In accordance with IMC 0612, Appendix B, Issue Screening, the finding is greater than minor significance because it was associated with the Barrier Integrity cornerstone attribute of Human Performance and adversely affected the cornerstone objective of maintaining the radiological barrier functionality of Standby Gas Trains. Although the licensee ultimately was able to demonstrate that the SGT system could perform its safety function without the charcoal beds and associated heaters, compliance with SGT TS was a prerequisite to providing reasonable assurance that the SGT can protect the public from radionuclide releases caused by accidents or events. 10 CFR 50.36 defines TS limiting conditions for operation as the lowest functional capability or performance levels of equipment required for safe operation of the facility. The SGT TS LCO requirement was not met and therefore the cornerstone objective for functionality as described in the TSs, was not maintained. In accordance with IMC 0609, Attachment 4, Phase 1 - Initial Screening and Characterization of Findings, the finding is determined to be of very low risk significance because the finding only represented a degradation of the radiological barrier function provided by the SGT system. Because this finding is of very low safety significance and has been entered in licensees corrective action program, the violation is being treated as a non-cited violation. The cause of this finding was directly related to the crosscutting aspect of thorough evaluation of identified problems in the problem identification and resolution area, because the licensee failed to properly classify, prioritize and evaluate the operability of the SGT system when the heater loss of power annunciator was received P.1(c). |
| Site: | Browns Ferry  |
|---|---|
| Report | IR 05000259/2009006 Section 4OA2 |
| Date counted | Sep 30, 2009 (2009Q3) |
| Type: | NCV: Green |
| cornerstone | Barrier Integrity |
| Identified by: | Self-revealing |
| Inspection Procedure: | IP 71152 |
| Inspectors (proximate) | J Rivera-Ortiz R Taylor P Higgins C Osterholtz K Korth D Merzke |
| CCA | P.2, Evaluation |
| INPO aspect | PI.2 |
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Finding - Browns Ferry - IR 05000259/2009006 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Browns Ferry) @ 2009Q3
Self-Identified List (Browns Ferry)
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