05000333/FIN-2015007-01
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Finding | |
|---|---|
| Title | Failure to Adequately Assess the Impact of SRV Leakage on Operability |
| Description | The inspectors identified a Green, non-cited violation (NCV) of Title 10 of the Code of Federal Regulations (10 CFR) Part 50, Appendix B, Criterion III, Design Control, associated with FitzPatricks failure to adequately assess and control the acceptance criteria specified in engineering analysis in EC-JAF-56258, Operability Input for CR-JAF-2015-01271 SRV G Tailpipe Temperature Increase, which referenced JAF-RPT-03-0056 Operational Leakage Action Levels for Target Rock Two-Stage Safety/Relief Valves. Specifically, FitzPatrick concluded that a 2-stage Target Rock Safety Relief Valve (SRV) was operable with pilot valve leakage provided the leak rate was less than 1000 lbm/hr. This conclusion was not adequately supported by the available industry and plant data on setpoint drift and the references provided. As a result, FitzPatrick did not declare 2-stage Target Rock Pilot valves inoperable when the leak rate exceeded 600 lbm/hr in 2007 and 2009. FitzPatrick entered this issue into the corrective action system (CR-JAF-2015-02850) and is reassessing the appropriate operability criteria. This performance deficiency is more than minor because it adversely affects the equipment performance attribute of the initiating events cornerstone in IMC 0612, Power Reactor Inspection Reports, Appendix B, Issue Screening, to limit the likelihood of events that upset plant stability and challenge critical safety functions during power operations by ensuring reactor coolant system (RCS) barrier integrity. This finding screens to Green using IMC 0609, Significance Determination Process, Attachment 4, Initial Characterization of Findings, and IMC 0609, Appendix A, Exhibit 1, Initiating Events Screening Questions, Section A, LOCA Initiators, as the finding could not result in leakage exceeding that of a small break loss-of-coolant accident (LOCA) nor could it have resulted in an interfacing system LOCA. The inspectors determined that this performance deficiency had a crosscutting aspect in human performance, conservative bias, where individuals use decision making-practices that emphasize prudent choices over those that are simply allowable. [H.14] Section 1R17 |
| Site: | FitzPatrick  |
|---|---|
| Report | IR 05000333/2015007 Section 1R17 |
| Date counted | Jun 30, 2015 (2015Q2) |
| Type: | NCV: Green |
| cornerstone | Initiating Events |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71111.17 |
| Inspectors (proximate) | B Haagensen J Ayala J Schoppy P Krohn |
| Violation of: | 10 CFR 50 Appendix B Criterion III, Design Control |
| CCA | H.14, Conservative Bias |
| INPO aspect | DM.2 |
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Finding - FitzPatrick - IR 05000333/2015007 | |||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (FitzPatrick) @ 2015Q2
Self-Identified List (FitzPatrick)
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