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ENS 47857
Show incoming properties
Category
ENS Notification  and Power Reactor
CFR
10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident +, 10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material +, 10 CFR 50.72#b3vC +  and 10 CFR 50.72#b3vD +
Current power
0  +
Current reactor mode
Hot Shutdown +
Description
At approximately 0515 EDT on April 21, 201 … At approximately 0515 EDT on April 21, 2012, the Harris Nuclear Plant (HNP) was in the process of a normal plant shutdown for a refueling outage. HNP was at 0% power in Mode 4. During OST-1046, MSIV Operability Test, 'B' and 'C' Main Steam Isolation Valves (MSIV), failed to close from the main control board.</br>At 0648 EDT an April 21, 2012 'B' MSIV shut immediately after the instrument air supply was isolated.</br>At 0938 EDT an April 21, 2012 'C' MSIV shut after the instrument air supply was isolated.</br>The cause of the equipment failure is not yet known but is currently being investigated. This report is being made in accordance with 10 CFR 50.72 (b)(3)(v)(C), inability to isolate and mitigate a radioactive release, and 10 CFR 50.72 (b)(3)(v)(D), a condition which could have prevented the fulfillment of a safety function to mitigate the consequences of an accident. The plant continues to remain shutdown at 0% power. Other equipment functioned as expected including the turbine isolation valves.</br>The licensee notified the NRC Resident Inspector.</br>* * * UPDATE FROM JOHN CAVES TO HOWIE CROUCH AT 1258 EDT ON 4/24/12 * * *</br>Investigation into the condition revealed the instrument air supply to the MSIVs was isolated at 0530 EDT and 'B' MSIV indicated (drifted) shut at 0607 EDT. The plant is currently in Mode 6, Refueling, and the investigation is ongoing.</br>The licensee notified the NRC Resident Inspector. Notified R2DO (Musser).esident Inspector. Notified R2DO (Musser).  +
Discovered date
09:15:00, 21 April 2012  +
ENS id number
47,857  +
Emergency class
Non Emergency +
Entered date
12:45:00, 21 April 2012  +
Event date
09:15:00, 21 April 2012  +
Event description
At approximately 0515 EDT on April 21, 201 … At approximately 0515 EDT on April 21, 2012, the Harris Nuclear Plant (HNP) was in the process of a normal plant shutdown for a refueling outage. HNP was at 0% power in Mode 4. During OST-1046, MSIV Operability Test, 'B' and 'C' Main Steam Isolation Valves (MSIV), failed to close from the main control board.</br>At 0648 EDT an April 21, 2012 'B' MSIV shut immediately after the instrument air supply was isolated.</br>At 0938 EDT an April 21, 2012 'C' MSIV shut after the instrument air supply was isolated.</br>The cause of the equipment failure is not yet known but is currently being investigated. This report is being made in accordance with 10 CFR 50.72 (b)(3)(v)(C), inability to isolate and mitigate a radioactive release, and 10 CFR 50.72 (b)(3)(v)(D), a condition which could have prevented the fulfillment of a safety function to mitigate the consequences of an accident. The plant continues to remain shutdown at 0% power. Other equipment functioned as expected including the turbine isolation valves.</br>The licensee notified the NRC Resident Inspector.</br>* * * UPDATE FROM JOHN CAVES TO HOWIE CROUCH AT 1258 EDT ON 4/24/12 * * *</br>Investigation into the condition revealed the instrument air supply to the MSIVs was isolated at 0530 EDT and 'B' MSIV indicated (drifted) shut at 0607 EDT. The plant is currently in Mode 6, Refueling, and the investigation is ongoing.</br>The licensee notified the NRC Resident Inspector. Notified R2DO (Musser).esident Inspector. Notified R2DO (Musser).  +
Has query"Has query" is a predefined property that represents meta information (in form of a <a rel="nofollow" class="external text" href="https://www.semantic-mediawiki.org/wiki/Subobject">subobject</a>) about individual queries and is provided by <a rel="nofollow" class="external text" href="https://www.semantic-mediawiki.org/wiki/Help:Special_properties">Semantic MediaWiki</a>.
ENS 47857 +, ENS 47857 +, ENS 47857 +, ENS 47857 +, ENS 47857 +, ENS 47857 +, ENS 47857 +, ENS 47857 +, ENS 47857 +, ENS 47857 +, ENS 47857 +, ENS 47857 +, ENS 47857 +, ENS 47857 +  and ENS 47857 +
Initial power
0  +
Initial reactor mode
Hot Shutdown +
Last update date
00:00:00, 24 April 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>.
02:04:19, 2 March 2018  +
NRC officer
Mark Abramovitz +
Notification date
12:45:00, 21 April 2012  +
Originated by
Al Bostic +
Person
Howie Crouch +
Reactor critical
false  +
Reactor scram
false  +
Reactor type
Westinghouse PWR 3-Loop +
Region
NRC Region 2 +
Reporting criterion
10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident +  and 10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material +
Reporting time
0.146 d (3.5 hours, 0.0208 weeks, 0.00479 months)  +
Site
Harris +
Start date
09:15:00, 21 April 2012  +
State
North Carolina +
System
Main Steam Isolation Valve +
Title
Main Steam Isolation Valves Fail to Shut  +
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/2012/20120425en.html#en47857  +
Unit
1  +
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