05000483/FIN-2015009-02
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Finding | |
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| Title | Failure to Have an Adequate Procedure for Calibration of the Auxiliary Feedwater Pump Flow Control Valve Potentiometer |
| Description | The team reviewed a self-revealing non-cited violation of 10 CFR Part 50, Appendix B, Criterion V, Instructions, Procedures, and Drawings, for failure to prescribe activities affecting quality using procedures appropriate to the circumstances. Specifically, on November 18, 2009, the licensee revised Procedure MTE-ZZ-QA033, MOVATS UDS [motor operated valve actuator test system universal diagnostic system] Testing of Torque Controlled Modutronics Limitorque Motor Operated Rising Stem Valves, Revision 3, to incorporate a second method of valve testing, and introduced an error in bypassing a test of the Modutronics board setup feedback potentiometer. As a result, on July 23, 2015, the actuator misinterpreted the actual position of the valve, which subsequently failed to open when operators attempted to open the valve following a forced reactor shutdown. In response to this issue, the licensee has reviewed all maintenance and test activities that could affect the potentiometer and has revised the appropriate procedures. This finding was entered into the licensees corrective action program as Callaway Action Request 201505332. The failure to provide a procedure appropriate to the circumstances for an auxiliary feedwater system flow control valve was a performance deficiency. This finding was more than minor, and therefore, a finding because it adversely affected the Mitigating Systems Cornerstone attribute of Procedure Quality 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 provide a procedure appropriate to the circumstances to set up an auxiliary feedwater system flow control valve feedback potentiometer resulted in its inability to operate manually 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. The valve would have automatically throttled auxiliary feedwater flow to approximately 300 gpm on demand. This finding did not have a cross-cutting aspect because the procedure revision resulting in the inadequate procedure was issued in 2009, and previous opportunities to correct the procedure occurred in 2010. Thus, this performance deficiency was not indicative of 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 Criterion V Technical Specification |
| 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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