05000382/FIN-2009004-01
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Finding | |
|---|---|
| Title | Failure to Follow Technical Specification Requirements for Reactor Protective Instrumentation |
| Description | The inspectors identified a Green non-cited violation of technical specification 3.3.1, Reactor Protective Instrumentation. The technical specifications require all four channels (A, B, C, and D) of local power density, departure from nucleate boiling ratio, and reactor coolant flow instruments to be operable when in Mode 1. These Channel B instruments require an input from the Channel B log power instrument, which was previously declared inoperable. With the Channel B log power instrument inoperable, the Channel B local power density, departure from nucleate boiling ratio, and reactor coolant flow instruments should also have been declared inoperable. The licensee entered this finding in their corrective action program as condition reports CR-WF3-2009-4401 and CR-WF3-2009-4407. The failure to either trip or bypass the inoperable channels within one hour was more than minor because it affected the configuration control attribute of the mitigating systems cornerstone. Specifically, deliberate operator action was required to ensure that proper reactor protection system coincidence and reliability were maintained. Also, if left uncorrected, the potential existed for Channel B reactor protective trips to be inadvertently removed while at power. The failure to meet the technical specifications was considered to be of very low safety significance (Green), since there was no actual loss of safety function. This finding has a cross-cutting aspect in the decision-making component of the human performance area because the licensee failed to verify the validity of underlying assumptions and identify unintended consequences of failing to comply with technical specification 3.3.1 by declaring the log power Channel B inoperable and not placing local power density, departure from nucleate boiling ratio, and reactor coolant flow instrument channels in either bypass or trip condition (H.1.b). |
| Site: | Waterford  |
|---|---|
| Report | IR 05000382/2009004 Section 1R15 |
| Date counted | Dec 31, 2009 (2009Q4) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71111.15 |
| Inspectors (proximate) | L Carson G Replogle J Clark D Overland M Chambers R Egli S Anderson T Buchanan R Hickok P Jayroe |
| CCA | H.14, Conservative Bias |
| INPO aspect | DM.2 |
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Finding - Waterford - IR 05000382/2009004 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Waterford) @ 2009Q4
Self-Identified List (Waterford)
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