ENS 42860
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ENS Event | |
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12:50 Sep 7, 2006 | |
Title | Invalid System Actuation |
Event Description | On September 7, 2006 at about 0750 CDST, an invalid actuation of B train Engineered Safety Features Actuation System (ESFAS) occurred during maintenance on ESFAS relay K110 B. The following B train Engineered Safety Features Actuation System (ESFAS) relays de-energized: K101, K102, K103, K108 and K109.
The event is reportable per 10CFR 50.73(a)(2)(iv)(A) as a 60 day notification and is being reported to the NRC by phone within 60 days. The invalid actuations did not occur when the systems had already been properly removed from service nor after the safety function had already been completed. The 32B buss de-energized which resulted in loss of pressurizer heaters Bank B and Containment Fan Coolers B and D actuated by shifting to slow speed. There was no actual Emergency Core Cooling System (ECCS) system flows actuated. All of the affected equipment functioned as designed when the relays deenergized The NRC Senior Resident was informed of the event. |
Where | |
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Waterford Louisiana (NRC Region 4) | |
Reporting | |
10 CFR 50.73(a)(1), Submit an LER, Invalid Actuation | |
Time - Person (Reporting Time:+433.72 h18.072 days <br />2.582 weeks <br />0.594 months <br />) | |
Opened: | Mike Mason 14:33 Sep 25, 2006 |
NRC Officer: | Bill Gott |
Last Updated: | Sep 25, 2006 |
42860 - NRC Website
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Unit 3 | |
---|---|
Reactor critical | Critical |
Scram | No |
Before | Power Operation (100 %) |
After | Power Operation (100 %) |
WEEKMONTHYEARENS 562022022-09-06T14:21:0006 September 2022 14:21:00
[Table view]10 CFR 50.73(a)(1), Submit an LER 60-DAY Optional Telephonic Notification of Invalid Engineered Safety Feature Actuation Signal ENS 552812021-04-02T01:23:0002 April 2021 01:23:00 10 CFR 50.73(a)(1), Submit an LER 60-Day Telephonic Notification of Invalid Plant Protection System Actuation Signal ENS 542052019-06-25T22:13:00025 June 2019 22:13:00 10 CFR 50.73(a)(1), Submit an LER Invalid Engineered Safety Feature Actuation Signal Due to Human Error ENS 428602006-09-07T12:50:0007 September 2006 12:50:00 10 CFR 50.73(a)(1), Submit an LER Invalid System Actuation 2022-09-06T14:21:00 | |
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