05000458/LER-1985-030, :on 851101,Div 1 RWCU Sys Isolation Occurred. Caused by Spurious Rwcs Filter Demineralizer Room 1 High Temp Alarm.Rwcu Sys Placed Back in Operation.Mod in Progress to Correct Flashing & Noise Spiking Problems

:on 851101,Div 1 RWCU Sys Isolation Occurred. Caused by Spurious Rwcs Filter Demineralizer Room 1 High Temp Alarm.Rwcu Sys Placed Back in Operation.Mod in Progress to Correct Flashing & Noise Spiking Problems

ML20137X118
Person / Time
Site:	River Bend
Issue date:	12/01/1985
From:	Shirey S GULF STATES UTILITIES CO.
To:
Shared Package
ML20137X056	List: 05000458/LER-1985-028, :on 851030,main Supply Breaker in 13.8 Kv Normal Switchgear Mistakenly Tripped,Causing Several Actuations.Caused by Personnel Error.Equipment Returned to Normal Operation 05000458/LER-1985-029, :on 851031,isolation of Div 1 RWCU Sys Occurred Causing Closing of Four Outboard Isolation Valves.Caused by Spurious Opening of Contacts on Riley Temp Modules.Mods to Temp Modules to Reduce Transient Susceptibility Begun 05000458/LER-1985-030, :on 851101,Div 1 RWCU Sys Isolation Occurred. Caused by Spurious Rwcs Filter Demineralizer Room 1 High Temp Alarm.Rwcu Sys Placed Back in Operation.Mod in Progress to Correct Flashing & Noise Spiking Problems 05000458/LER-1985-031, :on 851101,Div 1 RWCU Isolation Occurred.Caused by Actuation of Area Selection Switch When Operator Took RWCU Room Temps for Surveillance Test Procedure STP-000-001 & Failed to Place Switch in Bypass.Isolation Reset RBG-22712, Forwards LERs 85-028-00,85-029-00,85-030-00 & 85-031-00
References
LER-85-030, LER-85-30, NUDOCS 8512100415
Download: ML20137X118 (2)

LER-1985-030, on 851101,Div 1 RWCU Sys Isolation Occurred. Caused by Spurious Rwcs Filter Demineralizer Room 1 High Temp Alarm.Rwcu Sys Placed Back in Operation.Mod in Progress to Correct Flashing & Noise Spiking Problems

Event date:
Report date:
4581985030R00 - NRC Website

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At 0120,on li/01/85 with the plant in operational condition 2 (startup), a Division I Reactor Water Cleanup System isolation occurred as a

result of a spurious Reactor Water Cle.anup filter demineralizer room 1 high temperature alarm.

The Reactor Water Cleanup System was placed back in service with no further problems.

There was no impact on the safe operation of the plant or the health and safety of the public.

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At 0120 on 11/01/85 with the plant in operational condition 2

(startup),

a Reactor Water Cleanup (RWCU) System Division I isolation occurred.

Immediately prior to the isolation, a

RWCU filter demineralizer room 1

high temperature alarm sounded.

The room temperature was checked and found to be normal.

Upon investigation of the event it was noticed that the RWCU differential flow timer relay caused spiking noise to any temperature unit being read whenever the timing relay energized or de-energized (see LER.85-029).

RWCU differential flow indication was unstable during this period due to flashing at the blowdown flow transmitter (see LER 85-024).

A modification (MR 85-1037) is in progress to correct the flashing problem, as are maintenance work requests (MWR-10435 and MWR-15553) to correct the noise spiking problem.

This event posed no hazard to either plant op' erat.ng safety, nor the health and safety of the public.

Continued operation is unimpaired.

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