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The inspectors documented a self-revealing … The inspectors documented a self-revealing, non-cited violation of 10 CFR Part 50, Appendix B, Criterion V, Instructions, Procedures, and Drawings, associated with the failure to ensure compliance with the requirements of the stations troubleshooting plan generated in accordance with Procedure 7.0.1.7, Revision 15, Troubleshooting Plant Equipment. Specifically, licensee personnel failed to ensure that ground isolated test equipment was used during troubleshooting activities that affected the 250 Vdc bus. The licensee entered this deficiency into their corrective action program for resolution as Condition Report CR-CNS-2012-02717. The failure to follow the troubleshooting plan was a performance deficiency. The performance deficiency was determined to be more than minor because it was associated with the equipment performance attribute of the Mitigating Systems Cornerstone, and affected the associated cornerstone objective to ensure the availability, reliability, and capability of systems that respond to initiating events to prevent undesirable consequences, and is therefore, a finding. Specifically, the licensee failed to ensure that ground isolated test equipment was used as specified in the troubleshooting plan contained in Work Order 4863518, Troubleshooting SS-IVTR-UPS2 and Transfer Switch, causing a ground and 0.8 volt drop on the 250 Vdc Bus 1A. The inspectors evaluated the finding using Inspection Manual Chapter 0609.04, Phase 1 Initial Screening and Characterization of Findings. The inspectors determined that the finding is of very low safety significance (Green) because the finding: (1) was not a design or qualification issue confirmed not to result in a loss of operability or functionality; (2) did not represent an actual loss of safety function of system or train; (3) did not result in the loss of one or more trains of nontechnical specification equipment; (4) did not screen as potentially risk significant due to seismic, flooding, or severe weather initiating event. The finding was determined to have a cross-cutting aspect in the area of human performance associated with the decision making component because the licensee failed to use conservative assumptions and conduct effectiveness reviews to validate the underlying assumptions that ground isolated test equipment was used as specified in the troubleshooting plan. as specified in the troubleshooting plan.
23:59:59, 30 June 2012 +
23:59:59, 30 June 2012 +
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Modification date"Modification date" is a predefined property that corresponds to the date of the last modification of a subject and is provided by <a rel="nofollow" class="external text" href="https://www.semantic-mediawiki.org/wiki/Help:Special_properties">Semantic MediaWiki</a>.
19:04:51, 30 September 2017 +
23:59:59, 30 June 2012 +