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A green self-revealing finding of ENN-EP-G … A green self-revealing finding of ENN-EP-G-004, Switchyard and Large Power Transformer Preventive Maintenance Guidelines, occurred in that preventive maintenance (PM) was not performed as required on the W96 345kV line insulators. Specifically, the semi-annual corona surveys to identify degradation of insulators were not performed for line W96, which led to an insulator failure and resulted in an automatic trip of the reactor. Entergy replaced the damaged insulator and added the W96 line to the corona survey PM work order. Inspectors determined that Entergy did not perform PMs in accordance with ENN-EP-G-004, Switchyard and Large Power Transformer Preventive Maintenance Guidelines, on the 345kV insulators, which is a performance deficiency that was reasonably within Entergys ability to foresee and correct and should have been prevented. Specifically, the lack of PMs on the insulators allowed the insulators to degrade to a point where the condition of the insulator combined with environmental conditions led to a flashover event and a reactor trip. This finding is more than minor because it is associated with the Initiating Events cornerstone attribute of equipment performance, and adversely affected the cornerstone objective of limiting the likelihood of events that upset plant stability and challenge critical safety functions during shutdown as well as power operations. Specifically, the failure of the insulator led to a reactor trip. In accordance with IMC 0609.04, Initial Characterization of Findings, and Exhibit 1 of IMC 0609, Appendix A, The Significance Determination Process for Findings At-Power, the inspectors determined that this finding was of very low safety significance (Green) because the finding did not cause both a reactor trip and the loss of mitigation equipment relied upon to transition the plant from the onset of the trip to a stable shutdown condition. The inspectors determined that the finding had a cross-cutting aspect in Human Performance, Avoid Complacency, because Entergy did not recognize and plan for the possibility of mistakes, latent issues, and inherent risk. Specifically, Entergy performed a site review ensuring appropriate PMs were in place, and did not identify that the PM for the insulator was not being performed.for the insulator was not being performed.
23:59:59, 31 December 2016 +
23:59:59, 31 December 2016 +
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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>.
12:56:17, 25 September 2017 +
23:59:59, 31 December 2016 +