ENS 41956
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ENS Event | |
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15:00 Aug 28, 2005 | |
Title | Technical Specification Required Shutdown Due To Inoperable Suppression Chamber Vacuum Breaker |
Event Description | At 0325 on 8/28/05 the `B' Drywell to Suppression Chamber vacuum breaker indication began cycling from closed to intermediate open. Attempts were made to close the vacuum breaker from the control room were not successful. Attempts to establish a differential pressure between the drywall and suppression chamber airspace were also not successful at getting the vacuum breaker to close and stay closed. Technical Specification 3.6.4.1 was entered at 0325 and a plant shutdown was initiated at 1100 to comply with Technical Specifications. With the vacuum breaker open or partially open, the pressure suppression function of the suppression chamber could be compromised in the event of a postulated loss of coolant accident and therefore this safety function is degraded. The inoperability of this vacuum breaker is reportable in accordance with 50.72(b)(3)(v), The cause of the open vacuum breaker is currently not known. The plant will be taken to cold shutdown to facilitate torus entry to effect repairs.
There was no other equipment that was unavailable that contributed to this event. All other safety related equipment is currently operable. The licensee is starting a normal shutdown. The licensee notified the NRC Resident Inspector and will be notifying the LAC Township. |
Where | |
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Hope Creek ![]() New Jersey (NRC Region 1) | |
Reporting | |
10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown 10 CFR 50.72(b)(3)(v)(A), Loss of Safety Function - Shutdown the Reactor | |
Time - Person (Reporting Time:+-3.93 h-0.164 days <br />-0.0234 weeks <br />-0.00538 months <br />) | |
Opened: | Daron Zakarian 11:04 Aug 28, 2005 |
NRC Officer: | John Knoke |
Last Updated: | Aug 28, 2005 |
41956 - NRC Website
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Unit 1 | |
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Reactor critical | Critical |
Scram | No |
Before | Power Operation (100 %) |
After | Power Operation (100 %) |
Hope Creek ![]() | |
WEEKMONTHYEARENS 564952023-04-30T06:00:00030 April 2023 06:00:00
[Table view]10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown Technical Specification Required Shutdown ENS 442402008-05-25T13:30:00025 May 2008 13:30:00 10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown Inverter Fuse Failure ENS 419562005-08-28T15:00:00028 August 2005 15:00:00 10 CFR 50.72(b)(3)(v)(A), Loss of Safety Function - Shutdown the Reactor, 10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown Technical Specification Required Shutdown Due to Inoperable Suppression Chamber Vacuum Breaker ENS 408762004-07-16T14:00:00016 July 2004 14:00:00 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident, 10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown Technical Specification Shutdown/Loss of Single Safety Function ENS 405392004-02-23T06:52:00023 February 2004 06:52:00 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident, 10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown Technical Specification Required Shutdown Started Due to Grass Intrusion 2023-04-30T06:00:00 | |
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