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ENS 48372
Show incoming properties
Category
ENS Notification  and Power Reactor
CFR
10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition +  and 10 CFR 50.72(b)(3)(ii)(A), Seriously Degraded +
Current power
100  +
Current reactor mode
Power Operation +
Description
During logic and cable routing reviews for … During logic and cable routing reviews for Multiple Spurious Operations (MSO), an existing unprotected cable issue was identified that impacts the D22 emergency Diesel Generator (EDG) output breaker. This unprotected cable could fail due to fire damage in fire area 067W when the associated 4kV safeguard bus is credited for Post-Fire Safe Shutdown. </br>The single spurious fire induced cable failure identified can cause the D22 EDG output breaker to spuriously close when the 4kV safeguard bus is credited using the offsite power source. The existing fire safe shutdown analysis failed to identify this cable required protection in order to credit the 4kV safeguard bus in area 067W postulated fire.</br>The licensee has notified the NRC Resident Inspector.e has notified the NRC Resident Inspector.  +
Discovered date
20:00:00, 3 October 2012  +
ENS id number
48,372  +
Emergency class
Non Emergency +
Entered date
20:22:00, 3 October 2012  +
Event date
20:00:00, 3 October 2012  +
Event description
During logic and cable routing reviews for … During logic and cable routing reviews for Multiple Spurious Operations (MSO), an existing unprotected cable issue was identified that impacts the D22 emergency Diesel Generator (EDG) output breaker. This unprotected cable could fail due to fire damage in fire area 067W when the associated 4kV safeguard bus is credited for Post-Fire Safe Shutdown. </br>The single spurious fire induced cable failure identified can cause the D22 EDG output breaker to spuriously close when the 4kV safeguard bus is credited using the offsite power source. The existing fire safe shutdown analysis failed to identify this cable required protection in order to credit the 4kV safeguard bus in area 067W postulated fire.</br>The licensee has notified the NRC Resident Inspector.e has notified the NRC Resident Inspector.  +
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ENS 48372 +, ENS 48372 +, ENS 48372 +, ENS 48372 +, ENS 48372 +, ENS 48372 +, ENS 48372 +, ENS 48372 +, ENS 48372 +, ENS 48372 +, ENS 48372 +, ENS 48372 +, ENS 48372 +, ENS 48372 +  and ENS 48372 +
Initial power
100  +
Initial reactor mode
Power Operation +
Last update date
00:00:00, 3 October 2012  +
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>.
02:02:54, 2 March 2018  +
NRC officer
John Knoke +
Notification date
20:22:00, 3 October 2012  +
Originated by
Mark Arnosky +
Power source
4kV +
Reactor critical
true  +
Reactor scram
false  +
Reactor type
GE-4 +
Region
NRC Region 1 +
Reporting criterion
10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition +  and 10 CFR 50.72(b)(3)(ii)(A), Seriously Degraded +
Reporting time
0.0154 d (0.37 hours, 0.0022 weeks, 5.06826e-4 months)  +
Site
Limerick +
Start date
20:00:00, 3 October 2012  +
State
Pennsylvania +
System
Emergency Diesel Generator +
Title
Fire Safe Shutdown Analysis Failed to Identify Unprotected Cable  +
Topic
Safe Shutdown +  and Multiple Spurious Operation +
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.
http://www.nrc.gov/reading-rm/doc-collections/event-status/event/2012/20121004en.html#en48372  +
Unit
2  +
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