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An Appendix R non-compliance issue was ide … An Appendix R non-compliance issue was identified. When the plant automatically tripped on September 25, 2011, an unexpected automatic trip was identified in DC shunt trip breakers 72-01 and 72-02. This automatic trip function was not considered in the Appendix R electrical coordination evaluation. Preliminary analysis has shown that if the shunt trip breaker would have automatically opened due to fire induced fault currents, then Appendix R credited equipment may have been lost unexpectedly. The operability evaluation performed, resulted in increasing the shunt trip settings to maximum, and implementing compensatory measures to isolate some non-safety related electrical loads, which restored compliance with 10 CFR 50 Appendix R.</br>The licensee notified the NRC Senior Resident Inspector.</br>CR# PLP2011-04835nior Resident Inspector.
CR# PLP2011-04835 +
10:02:00, 26 September 2011 +
47,322 +
18:00:00, 5 October 2011 +
10:02:00, 26 September 2011 +
An Appendix R non-compliance issue was ide … An Appendix R non-compliance issue was identified. When the plant automatically tripped on September 25, 2011, an unexpected automatic trip was identified in DC shunt trip breakers 72-01 and 72-02. This automatic trip function was not considered in the Appendix R electrical coordination evaluation. Preliminary analysis has shown that if the shunt trip breaker would have automatically opened due to fire induced fault currents, then Appendix R credited equipment may have been lost unexpectedly. The operability evaluation performed, resulted in increasing the shunt trip settings to maximum, and implementing compensatory measures to isolate some non-safety related electrical loads, which restored compliance with 10 CFR 50 Appendix R.</br>The licensee notified the NRC Senior Resident Inspector.</br>CR# PLP2011-04835nior Resident Inspector.
CR# PLP2011-04835 +
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00:00:00, 5 October 2011 +
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>.
22:26:48, 24 September 2017 +
18:00:00, 5 October 2011 +
false +
false +
9.332 d (223.97 hours, 1.333 weeks, 0.307 months) +
10:02:00, 26 September 2011 +
URL"URL" is a <a href="/Special:Types/URL" title="Special:Types/URL">type</a> and predefined property provided by <a rel="nofollow" class="external text" href="https://www.semantic-mediawiki.org/wiki/Help:Special_properties">Semantic MediaWiki</a> to represent URI/URL values.