05000416/FIN-2016008-02
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Finding | |
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Title | Failure to Have Adequate Procedures |
Description | The team reviewed a self -revealed, non -cited violation of Technical Specification 3.4.10, Residual Heat Removal Shutdown Cooling System Cold Shutdown, for the licensees failure to verify an alternate method of decay heat removal was available when residual heat removal subsystem A was inoperable and unavailable due to a pump replacement. Specifically, the licensee inappropriately credited the alternate decay heat removal system as an available alternate method of decay heat removal. Credit for this system was inappropriate because, although the licensee believed the system had been aligned in standby, the alternate decay heat removal heat exchanger isolation valves had remained tagged closed, rendering the system unavailable to satisfy the technical specification requirement during the time period that residual heat removal subsystem A was unavailable. The licensee restored compliance by restoring residual heat removal subsystem A to available status . The licensee entered this issue into their corrective action program as Condition Report CR -GGN -2016 -07281. The failure to perform the required action to verify an alternate method of decay heat removal was available, when a residual heat removal shutdown cooling system was inoperable, was a performance deficiency. The performance deficiency was more than minor, and therefore a finding, because it was associated with the human performance attribute of the Mitigating Systems Cornerstone and affected the cornerstone objective to ensure the availability, reliability, and capability of systems that respond to initiating events to prevent undesirable consequences. A detailed risk evaluation (Attachment 2) calculated an increase in core damage frequency of 3.2E -7/y ear and an increase in large early release frequency of 7.3E -8/year. Therefore, this violation is associated with a finding having very low safety significance (Green). The team determined the finding had a cross -cutting aspect within the human performance area, field presence, because leaders failed to reinforce standards and expectations in the work areas of the plant [H.2]. |
Site: | Grand Gulf |
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Report | IR 05000416/2016008 Section 4OA3 |
Date counted | Jun 30, 2017 (2017Q2) |
Type: | NCV: Green |
cornerstone | Mitigating Systems |
Identified by: | NRC identified |
Inspection Procedure: | IP 71153 |
Inspectors (proximate) | M Haire D Proulx N Day D Loveless J Kozal |
Violation of: | Technical Specification |
CCA | H.2, Field Presence |
INPO aspect | LA.2 |
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Finding - Grand Gulf - IR 05000416/2016008 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Grand Gulf) @ 2017Q2
Self-Identified List (Grand Gulf)
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