05000324/FIN-2010008-02
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Finding | |
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| Title | Failure to Promptly Identify and Correct Isolation Override Circuitry Testing Deficiencies |
| Description | The team identified a non-cited violation of 10 CFR Part 50, Appendix B, Criterion III, Design Control, for the licensees failure to use conservative motor control center (MCC) voltage inputs when calculating motor actuator output torque and control circuit voltages for safety-related motor operator valve (MOV) motors that would be required to operate during design bases events. Specifically, the licensee used steady state MCC voltages instead of more limiting transient voltages that would occur during design bases load sequencing. The licensee entered these issues into their corrective action program as NCRs 427745 and 429541and performed additional analyses to demonstrate operability of the MOVs. The licensees failure to evaluate MOV motor actuator output torque using transient MCC voltages, and the failure to evaluate whether those MOVs would have adequate control power voltage was a performance deficiency. The performance deficiency was more that minor because it is associated with the mitigating systems cornerstone attribute of design control and adversely affected the cornerstone objective to ensure the availability, reliability, and capability of systems that respond to initiating events to prevent undesirable consequences. Specifically, the use of non-conservative voltage inputs for MOV calculations could result in the failure of the components to perform their design bases functions during an event. The inspectors conducted a Phase 1 SDP in accordance with IMC 0609.04, Initial Screening and Characterization of Findings, and determined the finding to be of very low safety significance (Green) because it was a design deficiency confirmed not to result in the loss of operability or functionality, did not represent the loss of a system function, and did not screen as potentially risk significant due to a seismic, flooding, or severe weather initiating event. The finding directly involved the cross-cutting aspect of procedural compliance and personnel follow procedures within the Work Practices component of the Human Resources area H.4(b). |
| Site: | Brunswick  |
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| Report | IR 05000324/2010008 Section 1R21 |
| Date counted | Mar 31, 2011 (2011Q1) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71111.21 |
| Inspectors (proximate) | J Nicely B Desai T Lighty A Alen D Mas D Jones G Ottenberg |
| INPO aspect | |
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Finding - Brunswick - IR 05000324/2010008 | ||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Brunswick) @ 2011Q1
Self-Identified List (Brunswick)
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