05000261/FIN-2017007-03
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Finding | |
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Title | Failure to Determine Most Severe Containment Spray pH |
Description | The NRC identified a non-cited violation of 10 CFR Part 50.49, Environmental qualification of electric equipment important to safety for nuclear power plants, for the licensees failure to correctly determine the most severe composition of chemicals for containment spray for the purposes of environment al qualification of equipment in containment. Specifically, the licensee did not identify that the pH of the chemical spray could have been more severe than what was identified in the Environmental Qualification zone maps if the Spray Additive Tank (SAT) had been operated at its limits provided in procedures CP-001 and OST- 023. In response to this issue, the licensee placed the issue into their corrective action program as NCR 2162081, demonstrated operability by reviewing current and historical operating conditions of the tank, and implemented administrative controls to prevent exceeding the qualified pH limit. This performance deficiency was more than minor because if left uncorrected, the performance deficiency had the potential to lead to a more significant safety concern. Specifically, the containment spray pH could have exceeded the pH to which equipment inside containment was qualified, if the SAT had been operated at its procedural limits. The inspectors determined the finding to be of very low safety significance (Green) because the finding was a deficiency affecting the design or qualification of a mitigating structure, system, or component (SSC), and the SSC maintained its operability or functionality. A cross-cutting aspect was not assigned because the finding was not indicative of current licensee performance. |
Site: | Robinson |
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Report | IR 05000261/2017007 Section 1R21 |
Date counted | Dec 31, 2017 (2017Q4) |
Type: | NCV: Green |
cornerstone | Mitigating Systems |
Identified by: | NRC identified |
Inspection Procedure: | IP 71111.21N |
Inspectors (proximate) | G Ottenberg T Fanelli M Greenleaf S Walker |
Violation of: | 10 CFR 50.49 |
INPO aspect | |
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Finding - Robinson - IR 05000261/2017007 | |||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Robinson) @ 2017Q4
Self-Identified List (Robinson)
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