05000483/FIN-2015009-07
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Finding | |
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| Title | Failure to Identify and Correct Additional Undersized Components on Auxiliary Feedwater System Flow Control Valve Modified Modutronics Controller Cards |
| Description | The team identified a non-cited violation of 10 CFR Part 50, Appendix B, Criterion XVI, Corrective Action, for the licensees failure to identify and correct a condition adverse to quality. Specifically, as of September 23, 2015, the licensee had not taken corrective action, following previous identification of undersized field current rectifier bridges, to ensure that an independent review of the modified circuit design had been completed, or that the modified cards had been subjected to a sufficient testing and qualification program. Thus, following questioning by the team, the licensee identified additional components (two other rectifier bridges) on the newly modified circuit cards that were also potentially undersized. The licensee performed an operability evaluation and concluded that the new cards were operable, based on additional circuit analysis that was performed. This issue was entered into the corrective action program as Callaway Action Request 201506874. The failure to identify and correct a condition adverse to quality was a performance deficiency. This performance deficiency is more than minor, and therefore, a finding 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 identify and correct design deficiencies associated with these circuit cards could have resulted in the inoperability of auxiliary feedwater control valves and their inability to operate on demand. Using Inspection Manual Chapter 0609, Appendix A, Exhibit 2, Mitigating Systems Screening Questions, dated June 19, 2012, the finding was determined to be of very low safety significance, because it did not affect system design, did not result in a loss of system function, did not represent a loss of function of a single train for greater than its technical specifications allowed outage time, and did not cause the loss of function of one or more non-technical specification trains of equipment designated as high safety-significance. This finding has a human performance cross-cutting aspect in the area of Avoid Complacency, because the licensee did not thoroughly evaluate the issue to ensure that the resolutions address causes and extent of conditions. Specifically, the licensee had identified that the Modutronics cards failed because of improper design of the field current rectifier bridge, but did not plan for the possibility for other latent issues to determine if other components on the cards were adequately sized for their application (H.12). |
| Site: | Callaway  |
|---|---|
| Report | IR 05000483/2015009 Section 4OA5 |
| Date counted | Dec 31, 2015 (2015Q4) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 93812 |
| Inspectors (proximate) | D Proulx J Jacobson N Taylor R Kopriva |
| Violation of: | 10 CFR 50 Appendix B Criterion XVI Technical Specification |
| CCA | H.12, Avoid Complacency |
| INPO aspect | QA.4 |
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Finding - Callaway - IR 05000483/2015009 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Callaway) @ 2015Q4
Self-Identified List (Callaway)
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