ENS 42860

v t e ENS Event
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.

ENS 42860 +/-
Where
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 Loading map...
v • d • e

v t e Emergency Notification System
Waterford with 10 CFR 50.73(a)(1), Submit an LER
WEEKMONTHYEAR2022-09-06T14:21:00 [Table view]
[ENS list for Waterford]

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