05000382/FIN-2011007-04
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Finding | |
|---|---|
| Title | Failure to Provide Adequate Preventive Maintenance Procedures for Aluminum/Copper Electrical Connections to the Ultimate Heat Sink Transformers |
| Description | The team identified a Green noncited violation of 10 CFR Part 50, Appendix B, Criterion V, Instructions, Procedures, and Drawings, which states, Activities affecting quality shall be prescribed by documented instructions, procedures, or drawings, of a type appropriate to the circumstances and shall be accomplished in accordance with these instructions, procedures, or drawings. Instructions, procedures, or drawings shall include appropriate quantitative or qualitative acceptance criteria for determining that important activities have been satisfactorily accomplished. Specifically, as of October 7, 2011, when developing and implementing preventive maintenance procedures and work orders for transformers and electrical connections, the licensee failed to provide specific acceptance criteria and instructions addressing the potential vulnerability of these connections to degradation from galvanic reaction or differential thermal expansion, particularly in a high humidity outdoor environment. This finding was entered into the licensees corrective action program as Condition Report CR-WF3-2011-06832. The team determined that the failure to provide suitable acceptance criteria and instructions in preventive maintenance procedures and work orders applicable to the aluminum/copper electrical connections to the transformers was a performance deficiency. This finding was more than minor because it was associated with the design control attribute of the Mitigating Systems Cornerstone and affected the cornerstone objective of ensuring the availability, reliability, and capability of systems that respond to initiating events to prevent undesirable consequences. Specifically, inadequate preventive maintenance of the aluminum/copper connections could lead to degradation of the electrical connections to the station service transformer and loss of the ultimate heat sink. In accordance with NRC Inspection Manual Chapter 0609, Attachment 4, Phase 1 - Initial Screening and Characterization of Findings, the issue was determined to have very low safety significance (Green) because it was not a design or qualification deficiency, did not represent a loss of system safety function, and did not screen as potentially risk significant due to a seismic, flooding, or severe weather initiating event. This finding did not have a crosscutting aspect because the most significant contributor did not reflect current licensee performance |
| Site: | Waterford  |
|---|---|
| Report | IR 05000382/2011007 Section 1R21 |
| Date counted | Dec 31, 2011 (2011Q4) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71111.21 |
| Inspectors (proximate) | C Smith T Farnholtz W Sifre J Leivo E Uribe N Hernandez |
| INPO aspect | |
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Finding - Waterford - IR 05000382/2011007 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Waterford) @ 2011Q4
Self-Identified List (Waterford)
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