05000259/FIN-2015004-01
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Finding | |
|---|---|
| Title | High Pressure Fire Protection System Piping Failure Following Pump Start |
| Description | The inspectors identified an Unresolved Item (URI) associated with a high pressure fire protection system pipe rupture on November 7, 2015. On November 7, 2015, following a smoke alarm caused by overheating some food in an operator kitchen (no fire occurred), the B electric fire pump started. Once the B electric fire pump started, a large break developed in a 14 inch section of the high pressure fire system piping between the Unit 1 and 2 diesel generator building and the offgas treatment building. Due to a lack of system pressure caused by the leak, the A and C electric fire pumps and the channel diesel driven fire pump started in their expected sequence. The required system pressure could not be maintained with all four fire pumps running. The leak was not able to be isolated effectively for approximately 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> and 13 minutes due to its location. The last successful test of a fire pump at rated system pressure occurred on November 1, 2015. This issue has been entered into the licensees CAP as CR 1102016. The inspectors determined that the licensees analysis of the piping failure mechanism was required to determine if a performance deficiency was associated with the piping rupture. This issue will be tracked as URI 05000259/260/296/2015-004-01, High Pressure Fire Protection System Piping Failure. |
| Site: | Browns Ferry  |
|---|---|
| Report | IR 05000259/2015004 Section 1R04 |
| Date counted | Dec 31, 2015 (2015Q4) |
| Type: | URI: |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71111.04 |
| Inspectors (proximate) | A Ruh D Dumbacher D Roberts R Baldwin T Stephena Blameya Ruh D Dumbacher D Lanyi H Bundy T Stephen |
| INPO aspect | |
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Finding - Browns Ferry - IR 05000259/2015004 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Browns Ferry) @ 2015Q4
Self-Identified List (Browns Ferry)
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