05000482/FIN-2011003-07
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Finding | |
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Title | Failure to Correct Procedure for Opening Main Steam Isolation Valves |
Description | The inspectors identified a cited violation of Technical Specification 5.4.1.a, Administrative Procedures, involving Wolf Creeks failure to correct Procedure SYS AB-120 for main steam isolation valve operation. Specifically, between March 3, 2010, and March 19, 2011, Wolf Creek experienced repeat cases of safety-system actuations due to Procedure SYS AB-120 containing inadequate steps to establish conditions necessary to open a main steam isolation valve. Corrective actions were previously limited to steam header pressures below 300 psi. Wolf Creek commenced a root cause evaluation of the March 19, 2011, safety injection under Condition Report 34964. Due to Wolf Creeks failure to restore compliance from previous NCV 05000482/2010004-01 within a reasonable time after the violation was identified, this violation is being cited as a Notice of Violation consistent with the Enforcement Policy. Failure to correct deficiencies in Procedure SYS AB-120 for steam pressures above 300 psi was a performance deficiency. The inspectors determined that this finding was more than minor because it impacted the equipment performance attribute for the Initiating Events Cornerstone, and it affected the cornerstone objective to limit the likelihood of those events that upset plant stability and challenge critical safety functions during shutdown as well as power operations. Specifically, this issue relates to the configuration control attribute for shut down equipment alignment. The inspectors evaluated the significance of this finding using Inspection Manual Chapter 0609.04. Assuming worst case degradation, the finding resulted in exceeding the technical specification limit for reactor coolant system leakage due to the pressurizer power-operated relief valve cycling. Therefore, the inspectors screened the finding to a Phase 2 review by the senior reactor analyst. The senior reactor analyst used the Wolf Creek SPAR model and concluded that the incremental core damage probability was 3.7E-7 (Green). The inspectors found that the cause of the finding has a cross-cutting aspect in the area of problem identification and resolution associated with the corrective action program. Specifically, several evaluations failed to have an adequate extent of condition review and did not find that procedures were inadequate for opening a main steam isolation valve above 300 psi |
Site: | Wolf Creek ![]() |
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Report | IR 05000482/2011003 Section 4OA3 |
Date counted | Jun 30, 2011 (2011Q2) |
Type: | Violation: Green |
cornerstone | Initiating Events |
Identified by: | NRC identified |
Inspection Procedure: | IP 71153 |
Inspectors (proximate) | C Peabody G Miller J Bashore L Carson L Willoughby N Makris S Alferink C Longa Fairbanksc Long C Peabody D Reinert D Strickland G Guerra G Miller G Pick J Drake |
CCA | P.2, Evaluation |
INPO aspect | PI.2 |
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Finding - Wolf Creek - IR 05000482/2011003 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Wolf Creek) @ 2011Q2
Self-Identified List (Wolf Creek)
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