05000483/FIN-2014007-01
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Finding | |
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Title | Failure to Establish Adequate Procedures for Testing the Load Tap Changers on Transformers XNB01 and XNB02 |
Description | The team identified a Green, non-cited violation of Technical Specification 5.4.1, which states, in part, Written procedures shall be established, implemented, and maintained covering the following activities: Part a. The applicable procedures recommended in Regulatory Guide 1.33, Revision 2, Appendix A, February 1978. Regulatory Guide 1.33, Appendix A, Section 9, Procedures for Performing Maintenance, states in part, Maintenance that can affect the performance of safety-related equipment should be properly pre-planned and performed in accordance with written procedures, documented instructions, or drawings appropriate to the circumstances. Specifically, from 2002 to April 24, 2014, due to the ineffective corrective action of Callaway Action Request (CAR) 200202970, the licensee did not establish preventative maintenance procedures to verify the operation and timing of the engineered safety feature transformers XNB01 and XNB02 load tap changers. In response to this issue, the licensee verified that immediate operability was not a concern since the measured parameters for the transformers did not indicate poor health or unsatisfactory performance. This finding was entered into the licensees corrective action program as Callaway Action Request (CAR) 201402827. The team determined that the failure to establish adequate preventative maintenance procedures to periodically verify the operation and timing of the engineered safety feature transformers XNB01 and XNB02 load tap changers was a performance deficiency. This finding was more than minor because it adversely affected the Mitigating Systems Cornerstone attribute of Equipment Performance and adversely 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 perform initial or periodic verification of the operation and timing of the engineered safety feature transformers XNB01 and XNB02 load tap changers could result in adverse operation of the load tap changer during a design basis event such that the safety-related buses may not have adequate voltage to reset the degraded voltage relay, thus spuriously disconnecting from the offsite power source. In accordance with Inspection Manual Chapter 0609, Appendix A, Significance Determination Process (SDP) for Findings At-Power, dated June 19, 2012, Exhibit 2, Mitigating Systems Screening Questions, 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 risksignificant due to seismic, flooding, or severe weather. This finding did not have a crosscutting aspect because the most significant contributor did not reflect current licensee performance. |
Site: | Callaway |
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Report | IR 05000483/2014007 Section 1R21 |
Date counted | Jun 30, 2014 (2014Q2) |
Type: | NCV: Green |
cornerstone | Mitigating Systems |
Identified by: | NRC identified |
Inspection Procedure: | IP 71111.21 |
Inspectors (proximate) | B Correll C Baron C Hale G Nicely J Braisted R Kopriva S Hedger T Farnholtz |
Violation of: | Technical Specification - Procedures Technical Specification |
INPO aspect | |
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Finding - Callaway - IR 05000483/2014007 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Callaway) @ 2014Q2
Self-Identified List (Callaway)
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