ENS 41956: Difference between revisions
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| event date = 08/28/2005 11:00 EDT | | event date = 08/28/2005 11:00 EDT | ||
| last update date = 08/28/2005 | | last update date = 08/28/2005 | ||
| title = Technical Specification Required Shutdown Due | | title = Technical Specification Required Shutdown Due to Inoperable Suppression Chamber Vacuum Breaker | ||
| event text = 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. | | event text = 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. | There was no other equipment that was unavailable that contributed to this event. All other safety related equipment is currently operable. | ||
Latest revision as of 22:20, 1 March 2018
| Where | |
|---|---|
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
| |
Hope Creek with 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 | |