05000341/FIN-2017001-02
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Finding | |
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| Title | |
| Description | Green . A finding of very low safety significance with an associated Non- Cited Violation of TS 3.1.7, Standby Liquid Control (SLC) System, was self -revealed when the licensee measured the boron concentration in the SLC storage tank and discovered the concentration was below the minimum requirement of 8.5 percent. Specifically, the licensee failed to adequately monitor and identify a decreasing trend in SLC storage tank sodium pentaborate concentration concurrent with known dilution of the SLC storage tank during pump and valve testing. The licensee entered this violation into its corrective action program for evaluation and identifi cation of appropriate corrective actions and restored the SLC sodium pentaborate concentration to within TS limits. The finding was of more than minor safety significance because it was associated with the Equipment Performance attribute of the Mitigating Systems Cornerstone and adversely affected the cornerstone objective of ensuring the availability, reliability, and capability of systems that respond to initiating events to prevent undesirable consequences. Specifically, a lower than allowable sodium pentaborate concentration affected the SLC systems ability to shut down the reactor during a design basis event. The finding was determined to be a licensee performance deficiency of very low safety significance during a detailed Significance Determination Process review since the delta core damage frequency ( CDF ) was determined to be less than 1.0E 6/year. The inspectors concluded this finding affected the cross -cutting area of human performance and the cross -cutting aspect of resources. Specifically, the licensee failed to ensure equipment and procedures were adequate to support nuclear safety . Th is issue would have been avoided if the system monitoring plan was trending tank level via a pressure indicator . Also, chemistry had no administrative limits in their procedure to add boron prior to the minimum TS limit was reached and the system engineer was not a reviewer on the routine surveillance procedure and was not trending the concentration as a backup. (IMC 0310, H.1 ) |
| Site: | Fermi  |
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| Report | IR 05000341/2017001 Section 4OA3 |
| Date counted | Mar 31, 2017 (2017Q1) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | Self-revealing |
| Inspection Procedure: | IP 71153 |
| Inspectors (proximate) | B Kemker K Pusateri K Riemer M Doyle P Smagacz |
| Violation of: | Technical Specification |
| CCA | H.1, Resources |
| INPO aspect | LA.1 |
| Finding closed by | |
| IR 05000341/2017001 (1 May 2017) | |
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Finding - Fermi - IR 05000341/2017001 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Fermi) @ 2017Q1
Self-Identified List (Fermi)
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