05000483/FIN-2017007-01
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Finding | |
|---|---|
| Title | Not Verifying the Operation and Timing of the Engineered Safety Feature Transformer XNB01 Load Tap Changer |
| Description | The team identified a Green, cited violation of Technical Specification 5.4.1.a which requires, in part, that written procedures shall be established, implemented, and maintained covering 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, requires, in part, that maintenance that can affect the performance of safety-related equipment should be properly pre-planned and performed in accordance with documented instructions appropriate to the circumstances. Specifically, from May 2014 through August 4, 2017, as a result of ineffective corrective action of Callaway Action Requests CAR-201402827 and CAR-201405312, the licensee failed to performed preventative maintenance procedures to verify the operation and timing of the engineered safety feature transformer XNB01 load tap changer. This violation was previously identified by the NRC and documented as NCV 05000483/2014007-01. In accordance with Section 2.3.2.a of the NRC Enforcement Policy, this finding is being cited because the licensee failed to restore compliance within a reasonable amount of time after the violation was initially identified. This finding was entered into the licensees corrective action program as Condition Report CR-201703992, VIO 05000458/2017007-01, Not Verifying the Operation and Timing of the Engineered Safety Feature Transformer XNB01 Load Tap Changer. The team determined that the failure to implement maintenance procedures to periodically verify transformer XNB01 load tap changer operation and time testing was a performance deficiency. The performance deficiency was more than minor, and therefore a finding, because it was associated with the equipment performance attribute of the Mitigating Systems Cornerstone 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 failures to perform, periodic verification of the operation and time testing of the load tap changer could result in adverse operation of the load tap changer during a design basis event. If the load tap changer did not operate correctly, 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 risk-significant due to seismic, flooding, or severe weather. The finding had a cross-cutting aspect in the area of human performance, work management, because the licensee failed to plan, control, and execute work activities such that nuclear safety is the overriding priority. Specifically, the licensee did not plan and execute the testing of the transformer XNB01 load tap changer in a timely manner (H.5). |
| Site: | Callaway  |
|---|---|
| Report | IR 05000483/2017007 Section 1R21 |
| Date counted | Sep 30, 2017 (2017Q3) |
| Type: | Violation: Green |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71111.21M |
| Inspectors (proximate) | I Anchando J Watkins A Palmer |
| Violation of: | Technical Specification - Procedures |
| CCA | H.5, Work Management |
| INPO aspect | WP.1 |
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Finding - Callaway - IR 05000483/2017007 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Callaway) @ 2017Q3
Self-Identified List (Callaway)
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