05000483/FIN-2015009-05
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Finding | |
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| Title | Failure to Determine the Cause and Take Corrective Action to Preclude Repetition for the Inadequate Design of Auxiliary Feedwater Flow Control Valve Modutronics 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 determine the cause and take corrective action to preclude repetition for a significant condition adverse to quality. Specifically, on May 21, 2015, the licensee received new information that refuted the previously assumed failure mechanism for AFW flow control valve ALHV0005 documented in December 2014, but failed to initiate a new Callaway action request to document the new information and report it to appropriate levels of management. As a result, the licensee failed to identify the failure of the valve as a significant condition adverse to quality, determine the cause, initiate a prompt operability assessment, and identify corrective action to preclude repetition until valve ALHV0007 failed, for the same reason, following a reactor trip on August 11, 2015. The licensee entered this issue into the corrective action program as Callaway action request 201506846. The failure to determine the cause and take corrective action to preclude repetition for a significant condition adverse to quality when failure analysis indicated that a significant defect existed on valves ALHV0005 and ALHV0007 was a performance deficiency. This finding was 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 of the licensee to determine the cause and take corrective action to preclude repetition for a significant condition adverse to quality when new information on the failure mechanism was received precluded determining the root cause and extent of condition and the performance of an operability determination, which resulted in failure to correct the condition before it further manifested itself following a reactor trip. 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 consistent process in that the individuals that received the information concerning the failure mechanism of the Modutronics cards failed to use a systematic approach to documenting the information and communicating it to appropriate levels of management (H.13). |
| 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 10 CFR 50 Appendix B Criterion XVI Technical Specification |
| CCA | H.13, Consistent Process |
| INPO aspect | DM.1 |
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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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