05000483/FIN-2015009-03
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Finding | |
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| Title | Failure to Have an Adequate Post-Maintenance Test for Setting the Motor-Driven Auxiliary Feedwater Flow Control Valve Modutronics Potentiometer |
| Description | The team reviewed a self-revealing non-cited violation of 10 CFR Part 50, Appendix B, Criterion XI, Test Control, for failure to ensure that testing demonstrated that structures, systems, and components will perform satisfactorily in service. Specifically, on October 24, 2014, the licensee failed to establish a suitable post-maintenance test program to demonstrate that the motor-driven auxiliary feedwater flow control valve Modutronics potentiometer had been set correctly after maintenance. The testing consisted of stroking the valve full open or full closed, and did not consider step changes in valve positioning and did not confirm the potentiometer feedback settings during valve positions that were not full open or full closed. In response to this issue, the licensee performed another calibration of the potentiometer, focusing on the potentiometer position during the valve stroke. The new post-maintenance test included opening the valve in discreet step changes to test the valve position feedback potentiometer. This finding was entered into the licensees corrective action program as Callaway Action Request 201505332. The failure to establish a suitable post-maintenance test program to demonstrate that the motor-driven auxiliary feedwater flow control valve Modutronics potentiometer would be set correctly after maintenance or testing 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 to establish a post-maintenance testing program for the motor-driven auxiliary feedwater valve Modutronics potentiometer to verify that the potentiometer was set correctly, resulted in valve ALHV0011 failing to open when operators initiated a signal to place the valve in an open position. In accordance with Inspection Manual Chapter 0609, Appendix A, The Significance Determination Process (SDP) for Findings at Power, Exhibit 2, Mitigating Systems Screening Questions, dated June 19, 2012, the issue screened as having very low safety significance (Green) because it was a design or qualification deficiency that did not represent a loss of operability or functionality; did not represent an actual loss of safety function of the system or train; did not result in the loss of one or more trains of non-technical specification equipment; and did not screen as potentially risk significant due to seismic, flooding, or severe weather. The team determined that this finding did not have a cross-cutting aspect because the most significant contributor did not reflect current licensee performance. |
| Site: | Callaway  |
|---|---|
| Report | IR 05000483/2015009 Section 4OA5 |
| Date counted | Dec 31, 2015 (2015Q4) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | Self-revealing |
| 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 XI |
| INPO aspect | |
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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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