ENS 40495
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ENS Event | |
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04:34 Feb 2, 2004 | |
Title | One Half Scram Signal Due to the Loss of the "B" Reactor Protection System Bus. |
Event Description | This report is being made pursuant to 10 CFR50.72(b)(3)(iv)(A), system actuation not including Reactor Protection System; due to a trip of the "D" Electric Power Monitoring Assembly on the "B" Reactor Protection System Motor Generator set resulting in a trip of the "B" Reactor Protection System bus. The loss of "B" Reactor Protection System bus caused the actuation of multiple Primary Containment Isolation Systems. Station abnormal procedures have been entered and the plant stabilized. The system actuations that occurred have been verified and restorations of these systems are in progress. Troubleshooting plans are being developed to determine cause of the trip and to correct the deficient condition.
The NRC Resident Inspector was notified of this event by the Licensee. |
Where | |
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Lasalle Illinois (NRC Region 3) | |
Reporting | |
10 CFR 50.72(b)(3)(iv)(A), System Actuation | |
LER: | 05000374/LER-2004-001 |
Time - Person (Reporting Time:+-2.15 h-0.0896 days <br />-0.0128 weeks <br />-0.00295 months <br />) | |
Opened: | Thomas Dean 02:25 Feb 2, 2004 |
NRC Officer: | John Mackinnon |
Last Updated: | Feb 2, 2004 |
40495 - NRC Website
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Unit 2 | |
---|---|
Reactor critical | Critical |
Scram | No |
Before | Power Operation (100 %) |
After | Power Operation (100 %) |
WEEKMONTHYEARENS 570832024-04-20T12:04:00020 April 2024 12:04:00
[Table view]10 CFR 50.72(b)(3)(iv)(A), System Actuation Automatic Actuation of Emergency Diesel Generators ENS 563892023-03-04T15:10:0004 March 2023 15:10:00 10 CFR 50.72(b)(3)(iv)(A), System Actuation Automatic Actuation of Reactor Protection System (RPS) ENS 539032019-03-01T04:17:0001 March 2019 04:17:00 10 CFR 50.72(b)(3)(iv)(A), System Actuation Specified System Actuation - Trip of Safety Related Bus ENS 503462014-08-05T22:34:0005 August 2014 22:34:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(iv)(A), System Actuation Automatic Reactor Scram ENS 489392013-04-17T20:11:00017 April 2013 20:11:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(a)(1)(i), Emergency Class Declaration, 10 CFR 50.72(b)(3)(iv)(A), System Actuation, 10 CFR 50.72(b)(2)(iv)(A), System Actuation - ECCS Discharge Notification of Unusual Event Declared Due to Loss of Offsite Power from a Lightning Strike ENS 423482006-02-20T06:23:00020 February 2006 06:23:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition, 10 CFR 50.72(a)(1)(i), Emergency Class Declaration, 10 CFR 50.72(b)(3)(iv)(A), System Actuation Site Area Emergency - Reactor Scram ENS 417872005-06-22T04:40:00022 June 2005 04:40:00 10 CFR 50.72(b)(3)(iv)(A), System Actuation Multiple Specified Systems Actuations Due to Loss of Ac Safety Related Buses ENS 404952004-02-02T04:34:0002 February 2004 04:34:00 10 CFR 50.72(b)(3)(iv)(A), System Actuation One Half Scram Signal Due to the Loss of the "B" Reactor Protection System Bus. 2024-04-20T12:04:00 | |
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