05000483/FIN-2014007-07
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Finding | |
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Title | |
Description | The team identified a Green non-cited violation of 10 CFR 50, Appendix B, Criterion XI, Test Control, which states, in part, A test program shall be established to assure that all testing required to demonstrate that structures, systems, and components will perform satisfactorily in service is identified and performed in accordance with written test procedures which incorporate the requirements and acceptance limits contained in applicable design documents. Specifically, prior to May 1, 2014, the licensee failed to include the motor operated valve unseating torque in the motor operated valve torque calculation. This could establish non-conservative results that could lead to the valve not functioning. In response to this concern, the licensee performed informal analyses based on the most recent test results and verified that all the subject valves were functional. This finding was entered into the licensee's corrective action program as Callaway Action Request (CAR) 201403034. The team determined that the failure to include the motor operated valve unseating torque in the calculation of the required torque was a performance deficiency. This finding was more than minor because it adversely affected the Mitigating Systems Cornerstone attribute of Equipment Performance and affected the cornerstone objective to ensure the availability, reliability, and capability of systems that respond to initiating events to prevent undesirable consequences. Specifically, the failure to include the valve disc unseating force in the torque calculation could establish non-conservative results that could lead to a failure of the valve to perform its safety function. The initial evaluation, based on a design friction coefficient of 0.2, identified four valves with zero or negative margin, however additional evaluation determined these valves were functional. In accordance with Inspection Manual Chapter 0609, Appendix A, The Significance Determination Process (SDP) for Findings AtPower, dated June 19, 2012, Exhibit 2, Mitigating Systems Screening Questions, the issue screened as having very low safety significance (Green) because it was a design or qualification deficiency that did not represent a loss of operability or functionality; did not represent an actual loss of safety function of the system or train; did not result in the loss of one or more trains of non-technical specification equipment; and did not screen as potentially risk-significant due to seismic, flooding, or severe weather. This finding did not have a cross-cutting aspect because the most significant contributor did not reflect current licensee performance. |
Site: | Callaway |
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Report | IR 05000483/2014007 Section 1R21 |
Date counted | Jun 30, 2014 (2014Q2) |
Type: | NCV: Green |
cornerstone | Mitigating Systems |
Identified by: | NRC identified |
Inspection Procedure: | IP 71111.21 |
Inspectors (proximate) | B Correll C Baron C Hale G Nicely J Braisted R Kopriva S Hedger T Farnholtz |
Violation of: | 10 CFR 50 Appendix B Criterion XI |
INPO aspect | |
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Finding - Callaway - IR 05000483/2014007 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Callaway) @ 2014Q2
Self-Identified List (Callaway)
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