05000445/FIN-2015008-05
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Finding | |
|---|---|
| Title | Failure to Perform Adequate Operability Assessments associated with Failures of Service Water System Vacuum Breaker during Surveillance Tests |
| Description | The team identified an unresolved issue associated with the failures of the vacuum service water breakers that remained in service. During these failures, the licensee had documented the surveillance failures as degraded conditions and concluded that they did not have an impact on the operability of the service water system. The team reviewed the licensees operability assessments associated with surveillance tests where at least one of the service water system vacuum breakers failed to meet acceptance standards. During these failures, maintenance personnel mechanically agitated the vacuum breakers in order to get them to operate but did not replace the vacuum breakers until a future date. The inspectors noted that design basis calculations indicate that the larger of the two vacuum breakers (check valve) was required in order to protect the EDG jacket service water coolers and concluded that the licensee did not have appropriate justification to conclude that the service water system remained operable with a failed vacuum breaker if it was the larger breaker. During the inspection period the team was not able to determine which vacuum breakers were found in a degraded condition, therefore more information is required to determine if a non-compliance exists. Specifically, since September 2010, the licensee issued twenty six operability evaluations associated with failed surveillance test on vacuum breakers in the service water system where operators used incorrect information when assessing operability, which failed to establish a reasonable expectation of operability. This issue does not represent an immediate safety concern because at the time of discovery, there were no failed vacuum breakers in service. The licensee entered the finding into corrective action program as Condition Report CR-2015-008334. This issue will remain unresolved until the NRC is provided sufficient information regarding the particulars associated with the check valve/vacuum breaker failures in order to determine if a non-compliance exists. Specifically, the team requires information associated with the specific valve(s) that failed the length of time that the failed valve remained in service prior to replacement; whether the opposite train diesel generator was ever inoperable during the period the failed valve remained in service. (URI 05000445/2015008-05; 05000446/2015008-05, Failure to Perform Adequate Operability Assessments associated with Failures of Service Water System Vacuum Breaker during Surveillance Tests) |
| Site: | Comanche Peak  |
|---|---|
| Report | IR 05000445/2015008 Section 4OA2 |
| Date counted | Sep 30, 2015 (2015Q3) |
| Type: | URI: |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71152 |
| Inspectors (proximate) | B Dionne G Guerra J Groom J Josey J O'Donnell J Watkins L Carson M Bloodgood P Hernandez R Kumana S Hedgerc Alldredgee Ruesch H Freeman J Drake J Josey |
| INPO aspect | |
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Finding - Comanche Peak - IR 05000445/2015008 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Comanche Peak) @ 2015Q3
Self-Identified List (Comanche Peak)
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