05000366/LER-1980-083-03, /03L-0:on 800514,w/reactor in Startup Mode, Personnel Observed That Indicating Lights for 2D RHR Pump Suction Valves Were Extinguished.Valves Were Not Operable from Control Switches.Caused by Broken Limit Switch Rotors

/03L-0:on 800514,w/reactor in Startup Mode, Personnel Observed That Indicating Lights for 2D RHR Pump Suction Valves Were Extinguished.Valves Were Not Operable from Control Switches.Caused by Broken Limit Switch Rotors

ML19323J040
Person / Time
Site:	Hatch
Issue date:	06/05/1980
From:	Nix R GEORGIA POWER CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19323J037	List: 05000366/LER-1980-083, Forwards LER 80-083/03L-0 05000366/LER-1980-083-03, /03L-0:on 800514,w/reactor in Startup Mode, Personnel Observed That Indicating Lights for 2D RHR Pump Suction Valves Were Extinguished.Valves Were Not Operable from Control Switches.Caused by Broken Limit Switch Rotors
References
LER-80-083-03L, LER-80-83-3L, NUDOCS 8006170687
Download: ML19323J040 (2)

LER-1980-083, /03L-0:on 800514,w/reactor in Startup Mode, Personnel Observed That Indicating Lights for 2D RHR Pump Suction Valves Were Extinguished.Valves Were Not Operable from Control Switches.Caused by Broken Limit Switch Rotors

Event date:
Report date:
3661980083R03 - NRC Website

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LICENSEE EVENT REPORT m

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EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h Bl With the reactor in the start-up inode. personnel observed that the indicatinn i

2 Ell-F004D and F006D, were ex-l Bl lights for the 2D RHR Pump Suction Valves, 3l tinguished. Further investigation revealed that the valves would not oper-l The 2D RHR Pump was declared inoperable and l

Bl ate from the control switches.

3.5.3.2.

I Ol both Core Sprav Subsystems verified to be operabic per Tech Spec aor were there any ef fects to nublic health l

7 l This was not a repetitive event l

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The f ailure of the valves to operate was due to the limit switch rotors yl I

The limit switch finger bases were found loose, which had gl being broke.

allowed the rotors to hang and break when the valves were operated. The 1

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finger bases were tightened and the rotors were replaced. The valves were yl I

then operated satisf actorily and the 2D pump returned to service.

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NARRATIVE

REPORT Ceorgia Power Company Plant E. 1. Hatch Baxicy, Georgia 31513 Reportable Occurrence Report No. 50-366/1980-083.

On May 14, 1980, with the reactor in the startup mode and a power icvel of 25 MWt, personnel observed that 2D RilR Pump Suction Valves, 2 Ell-F004D and F006D.there were no indicating lights for the revealed that the valves would not Further investigation operate from the control switches.

The 2D RilR Pump was declared inoperable and both Core Spray Subsystems were verified to be operable per Technical Specifications 3.5.3.2.

The failure of the valves to operate was due to the open and close limit switch rotors in each valve operator being broke.

base had come loose and allowed the rotor contacts to hang on the fingersThe limit swit which broke the rotors when the valve was operated.

tightened and the rotors were replaced.

The finger bases were satisfactorily and the 2D RHR Pump returned to service.The valves were then operated This was not a repetitive evo't nor were there any effect to public h'calth and safety.

The generic review did not reveal any inherent problems.

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