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Green . An NRC- identified Green NCV of 10 … Green . An NRC- identified Green NCV of 10 CFR Part 50, Appendix B, Criterion III, Design Control, was identified for the failure of the licensee to install flood barrier seals around the emergency diesel generator (EDG) 2, four -day fuel oil tank v ent as described in engineering change (EC) 400606. This result ed in a nonfunctional flood barrier into the EDG 2 four -day tank room. As an immediate corrective action, the licensee grouted the opening to prevent water intrusion into the EDG 2 four -day f uel oil tank room. The licensee entered this issue into the CAP as NCR 2093563. The inspectors determined the failure of the licensee to control the design of the installation of the new EDG 2 four -day fuel oil tank vent was a performance deficiency. Th e finding is more than minor because it is associated with the protection against external factors (i.e., flood hazard) attribute of the Mitigating Systems Cornerstone and adversely affected the cornerstone objective to ensure the availability, reliability , and capability of systems that respond to initiating events to prevent undesirable consequences (i.e., c ore damage). Specifically, the licensee failed to install flood barrier seals around the EDG 2 four -day fuel oil tank vent designed to mitigate a flood of the EDG 2 four -day fuel oil tank room. Using IMC 0609, Appendix A, issued June 9, 2012, The SDP for Findings At -Power, the inspectors determined the finding screened to Exhibit 4, External Events Screening Questions, since the finding involved the loss of equipment specifically designed to mitigate a flood. The inspectors determined the finding screened to Green since if the flood barrier is assumed to be completely failed, it 4 would not result in the inoperability or degradation of EDG 2, and would not involve the total loss of any safety function that contributes to external event initiated core damage accident sequences. The finding has a cross -cutting aspect in the area of human performance associated with the design margins attribute because the licensee failed to maintain equipment within design margins and failed to change margins through a systematic and rigorous process. Specifically, the licensee changed the installation of the EDG 2 fuel oil tank roof vent without ensuring flood protection during the modification. (H.6)protection during the modification. (H.6)

Discovered date

23:59:59, 31 March 2017 +

Docket

05000324 + and 05000325 +

Engineering change

EC-400606 +

Event date

23:59:59, 31 March 2017 +

Finding integer

3 +

Finding type

Non-cited violation +

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INPO aspect

WP.2 +

Identified by

NRC identified +

Inspection Manual Chapter

NRC Inspection Manual 0609/Appendix A, The Significance Determination Process (SDP) for Findings At-Power +

Inspection procedure

IP 71111.18 +

Inspection report

IR 05000324/2017001 +

Inspector

J Panfel +, Wade Loo +, Mark Schwieg +, Michelle Catts +, Jim Dodson +, Brendan Collins +, Steven Rose + and Jonathan Rivera +

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>.

12:57:54, 25 September 2017 +

Person