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A finding of very low safety significance … A finding of very low safety significance (Green) and an associated NCV of 10 CFR Part 50, Appendix B, Criterion XVI, Corrective Action, was identified by the inspectors when licensee personnel failed to accomplish corrective actions following identified boric acid leakage on a reactor head penetration. Specifically, the licensee did not adequately implement corrective actions involving cleaning and removal of boric acid deposits following identified boric acid leakage on Reactor Head Penetration No. 77. The licensee entered this issue into the CAP as IR 1359227 and performed a UT examination of the penetration to confirm that no leakage path existed and a post-cleaning visual examination to confirm no signs of gross degradation. The performance deficiency was determined to be more than minor because the issue was associated with the Equipment Performance attribute of the Initiating Events Cornerstone and adversely affected the cornerstone objective of limiting the likelihood of those events that upset plant stability and challenge critical safety functions during shutdown, as well as power operation. Specifically, the reactor head was returned to service without accomplishing corrective actions to remove all boric acid deposits from the Penetration No. 77 leakage. This resulted in boric acid deposits being left on the reactor head for one operating cycle and masking of potential surface indications from Penetration No. 77 leakage during the subsequent Bare Metal Visual (BMV) examination. Because no gross visual degradation was observed during the BMV examination after cleaning of boric acid deposits and no leakage path was detected during the UT examination of Penetration No. 77 in the A1R16 outage, the inspectors answered No to the SDP Phase I screening question Assuming worst case degradation, would the finding result in exceeding the Tech Spec limit for any RCS leakage or could the finding have likely affected other mitigation systems resulting in a total loss of their safety function assuming the worst case degradation? Therefore, the finding screened as having very low safety significance (Green). This finding had a cross-cutting aspect in the Work Control component of the Human Performance cross-cutting area because the licensee did not appropriately plan the reactor work activity to repair and clean the mechanical connection on Penetration No. 77 by incorporating job site conditions including risk insights associated with potentially washing down boric acid deposits below the reactor head insulation onto the reactor head.tor head insulation onto the reactor head.
23:59:59, 30 June 2012 +
23:59:59, 30 June 2012 +
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Eric Duncan +, R Walton +, B Metrow +, M Perry +, Alex Garmoe +, Mel Holmberg +, Atif Shaikh +, Raymond Ng +, Tony Go + and Jamie Benjamin +
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>.
19:04:23, 30 September 2017 +
Eric Duncan +, R Walton +, B Metrow +, M Perry +, Alex Garmoe +, Mel Holmberg +, Atif Shaikh +, Raymond Ng +, Tony Go + and Jamie Benjamin +
23:59:59, 30 June 2012 +
Failure to Accomplish Corrective Actions Following Identified Boric Acid Leakage on Reactor Head Penetration No. 77 +