ENS 44899

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v t e ENS Event
16:10 Jan 20, 2009
Title	Invalid Actuation of Secondary Containment
Event Description	Monticello Nuclear Generating Plant is making a telephone Report in Accordance with 10 CFR 50.73(a)(2)(iv)(A) Invalid Actuation of the Standby Gas Treatment and Secondary Containment Isolation Systems due to high resistance resulting from inadequate contact wipe of a relay. This report is being made in lieu of a written Licensee Event Report. SPECIFIC TRAINS AND SYSTEMS THAT WERE ACTUATED The 'A' Standby Gas Treatment system actuated and Secondary Containment isolated. DESCRIPTION OF WHETHER EACH TRAIN ACTUATION WAS COMPLETE OR PARTIAL On January 20, 2009, during performance of Step 29 of Procedure 0003, Drywell High Pressure Scram and Groups 2, 3, & Secondary Containment Isolation Test and Calibration, the Standby Gas System automatically initiated and Secondary Containment isolated due to high contact resistance on a Drywell High Pressure HFA relay. This resulted in increased steam chase temperatures, entry into Action Statement TS 3.3.6.2.A for Secondary Containment Isolation Instrumentation, entry into Action Statement TS 3.6.4.1.A for Secondary Containment, entry into Action Statement TS 3.6.4.3.A for Standby Gas Treatment, and 10CFR50.73 reportability. DESCRIPTION OF WHETHER OR NOT THE SYSTEM STARTED AND FUNCTIONED SUCCESSFULLY All systems started and functioned successfully. The cause of the initiation of SBGT and isolation of Secondary Containment during performance of Step 29 of Procedure 0003 was the presence of high resistance at relay 16A-K60A, contacts 5-6. The cause of high resistance at relay 16A-K60A, contacts 5-6, was inadequate contact wipe. The cause of the inadequate contact wipe was inadequate contact wipe adjustment after replacement of HFA coils with the new Century series coil. The NRC Resident Inspector was notified of this event report.

ENS 44899 +/-
Where
Monticello Minnesota (NRC Region 3)
Reporting

10 CFR 50.73(a)(1), Submit an LER, Invalid Actuation
Time - Person (Reporting Time:+1220.18 h50.841 days <br />7.263 weeks <br />1.671 months <br />)
Opened:	Ellis Pfeffer 11:21 Mar 12, 2009
NRC Officer:	Pete Snyder
Last Updated:	Mar 12, 2009
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v • d • e

v t e Emergency Notification System
Monticello with 10 CFR 50.73(a)(1), Submit an LER
WEEKMONTHYEAR2023-04-28T09:02:00 [Table view]
[ENS list for Monticello]

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