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ENS 54131
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Category
ENS Notification  and Power Reactor
CFR
10 CFR 50.72(b)(3)(v)(A), Loss of Safety Function - Shutdown the Reactor +, 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident +, 10 CFR 50.72#b3vD +  and 10 CFR 50.72#b3vA +
Current power
100  +
Current reactor mode
Power Operation +
Description
On June 25, 2019, at 0428 CDT, the Waterfo … On June 25, 2019, at 0428 CDT, the Waterford 3 shift operating crew declared the control room envelope inoperable in accordance with Technical Specification (TS) 3.7.6.1 due to both Broad Range Gas Monitors being inoperable. Operations entered TS 3.7.6.1 action b, which requires that with one or more control room emergency air filtration trains inoperable due to inoperable control room envelope boundary in Modes 1, 2, 3, or 4, then: </br>1. Immediately initiate action to implement mitigating actions; </br>2. Within 24 hours, verify mitigating actions ensure control room envelope occupant exposures to radiological, chemical, and smoke hazards will not exceed limits; and </br>3. Within 90 days, restore the control room envelope boundary to operable status.</br>Action b.1 was completed by placing the control room in isolate mode at time 0441 CDT. This event is reportable pursuant to 10 CFR 50.72(b)(3)(v)(A) and 10 CFR 50.72(b)(3)(v)(D), event or condition that could have prevented fulfillment of a safety function of structures or systems that are needed to (A) shutdown the reactor and maintain it in shutdown condition and (D) mitigate the consequences of an accident, due to the control room envelope being inoperable.</br>The NRC Senior Resident Inspector has been notified.nior Resident Inspector has been notified.  +
Discovered date
09:28:00, 25 June 2019  +
Emergency class
Non Emergency +
Entered date
11:09:00, 25 June 2019  +
Event date
09:28:00, 25 June 2019  +
Event description
On June 25, 2019, at 0428 CDT, the Waterfo … On June 25, 2019, at 0428 CDT, the Waterford 3 shift operating crew declared the control room envelope inoperable in accordance with Technical Specification (TS) 3.7.6.1 due to both Broad Range Gas Monitors being inoperable. Operations entered TS 3.7.6.1 action b, which requires that with one or more control room emergency air filtration trains inoperable due to inoperable control room envelope boundary in Modes 1, 2, 3, or 4, then: </br>1. Immediately initiate action to implement mitigating actions; </br>2. Within 24 hours, verify mitigating actions ensure control room envelope occupant exposures to radiological, chemical, and smoke hazards will not exceed limits; and </br>3. Within 90 days, restore the control room envelope boundary to operable status.</br>Action b.1 was completed by placing the control room in isolate mode at time 0441 CDT. This event is reportable pursuant to 10 CFR 50.72(b)(3)(v)(A) and 10 CFR 50.72(b)(3)(v)(D), event or condition that could have prevented fulfillment of a safety function of structures or systems that are needed to (A) shutdown the reactor and maintain it in shutdown condition and (D) mitigate the consequences of an accident, due to the control room envelope being inoperable.</br>The NRC Senior Resident Inspector has been notified.nior Resident Inspector has been notified.  +
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ENS 54131 +, ENS 54131 +, ENS 54131 +, ENS 54131 +, ENS 54131 +, ENS 54131 +, ENS 54131 +, ENS 54131 +, ENS 54131 +, ENS 54131 +, ENS 54131 +, ENS 54131 +, ENS 54131 +, ENS 54131 +  and ENS 54131 +
Hours
2.777778e-4 d (0.00667 hours, 3.968254e-5 weeks, 9.132e-6 months)  +
Initial power
100  +
Initial reactor mode
Power Operation +
Last update date
00:00:00, 25 June 2019  +
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>.
04:47:32, 24 February 2020  +
NRC officer
Jeffrey Whited +
Notification date
11:09:00, 25 June 2019  +
Originated by
Jack Morrison +
Reactor critical
true  +
Reactor scram
false  +
Region
NRC Region 4 +
Reporting criterion
10 CFR 50.72(b)(3)(v)(A), Loss of Safety Function - Shutdown the Reactor +  and 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident +
Reporting time
0.07 d (1.68 hours, 0.01 weeks, 0.0023 months)  +
Site
Waterford +
Start date
09:28:00, 25 June 2019  +
State
Louisiana +
System
Control Room Envelope +
TS
TS-3.7.6.1 +
Title
Control Room Envelope Inoperable Due to Broad Range Gas Monitors Being Inoperable  +
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.
https://www.nrc.gov/reading-rm/doc-collections/event-status/event/2019/20190626en.html#en54131  +
Unit
3  +
 
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