05000259/FIN-2015004-02
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Finding | |
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| Title | Failure to Properly Manage Risk During Planned Maintenance Activities |
| Description | A self-revealing non-cited violation (NCV) of 10 CFR Part 50.65(a)(4) was identified for the licensees failure to properly assess and manage the risk associated with performing maintenance on the Standby Gas Treatment (SBGT) system piping. Specifically, the licensee failed to evaluate the effects of excavation activities associated with the SBGT piping repairs on the condensing coils of the Control Bay (CB) chillers which resulted in the fouling of the condensing coils of the A CB chiller. The licensees immediate corrective action was to clean the A CB chiller condensing coils and restore it to an operable status. The issue was entered into the licensees corrective action program (CAP) as condition report (CR) 1056829. The performance deficiency was more than minor because it was associated with the Equipment Performance attribute of the mitigating systems cornerstone and adversely affected the cornerstone objective to ensure the availability, reliability, and capability of systems that respond to events and prevent undesirable consequences. Specifically, with the B CB chiller out of service for maintenance, the A CB chiller lost the ability to perform its safety function due to excessive dirt buildup caused, in part, by the nearby excavation activities. The inspectors characterized the finding using IMC 0609, Appendix A, Significance Determination Process, Exhibit 2, Mitigating Systems. The finding was screened to Green because although the A CB chiller was inoperable, the performance deficiency did not cause the loss of system function, and the inoperability did not exceed the 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />. The finding does not represent an immediate safety concern because the licensee had cleaned the A CB chiller condensing coils and restored the systems safety function. A cross cutting aspect of Teamwork was assigned due to the licensees Engineering, Maintenance, Work Control, and Operations staffs failure to adequately coordinate or communicate prior to commencing the B CB chiller maintenance. (H.4) |
| Site: | Browns Ferry  |
|---|---|
| Report | IR 05000259/2015004 Section 1R13 |
| Date counted | Dec 31, 2015 (2015Q4) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | Self-revealing |
| Inspection Procedure: | IP 71111.13 |
| Inspectors (proximate) | A Ruh D Dumbacher D Roberts R Baldwin T Stephen |
| Violation of: | 10 CFR 50.65(a)(4) 10 CFR 50.65 |
| CCA | H.4, Teamwork |
| INPO aspect | PA.3 |
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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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