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A self-revealing Green NCV of 10 CFR 50, A … A self-revealing Green NCV of 10 CFR 50, Appendix B, Criterion XVI, Corrective Action, was identified for the licensees failure to correct a condition adverse to quality. The licensee had previously identified that the fish population in the Standby Nuclear Service Water Pond (SNSWP) had significantly increased but failed to perform the annual fish eradication of the SNSWP to prevent macro-fouling of the RN pump suction strainers. This resulted in the licensee declaring both trains of RN inoperable and entry into TS 3.0.3 for both units. Licensee corrective actions included chemically treating the SNSWP to eliminate the macro-fouling source, flushing the RN intake lines, and establishing a periodic chemical treatment of the SNSWP. This PD was more than minor because it was associated with the equipment performance attribute and adversely impacted the Mitigating Systems cornerstone objective of ensuring the availability, reliability, and capability of the RN system to provide long term decay heat removal because the macro-fouling of the suction strainers rendered the RN pumps inoperable. This finding was evaluated using IMC 0609, Significance Determination Process, with an exposure time of greater than 30 days. A Phase 3 SDP analysis was required to be performed and determined the resultant core damage frequency (CDF) was <1E-6 (Green). This finding was determined to be directly related to the conservative assumptions aspect of the Decision Making component in the Human Performance crosscutting area because the licensees decisions to defer the macro-fouling treatment of the SNSWP were non-conservative (H.1(b)). of the SNSWP were non-conservative (H.1(b)). +

Discovered date

23:59:59, 31 March 2011 +

Docket

05000369 + and 05000370 +

Event date

23:59:59, 31 March 2011 +

Finding integer

3 +

Finding type

Non-cited violation +

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INPO aspect

DM.2 +

Identified by

Self-revealing +

Inspection Manual Chapter

NRC Inspection Manual 0609 +

Inspection procedure

IP 71153, Event Followup +

Inspection report

IR 05000369/2011002 +

Inspector

J Bartley +, A Vargas +, J Brady +, Eric Stamm + and Jermaine Heath +

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>.

19:05:38, 30 September 2017 +

Person