05000366/LER-1980-059-03, /03L-0:on 800416,w/unit in Cold Shutdown,Msiv Found W/Nonqualified Limit Switch.Caused by Installation Error.Limit Switch Was Replaced W/Qualified Model

/03L-0:on 800416,w/unit in Cold Shutdown,Msiv Found W/Nonqualified Limit Switch.Caused by Installation Error.Limit Switch Was Replaced W/Qualified Model

ML19309H653
Person / Time
Site:	Hatch
Issue date:	05/06/1980
From:	Coggin C GEORGIA POWER CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19309H650	List: 05000366/LER-1980-059, Forwards LER 80-059/03L-0 05000366/LER-1980-059-03, /03L-0:on 800416,w/unit in Cold Shutdown,Msiv Found W/Nonqualified Limit Switch.Caused by Installation Error.Limit Switch Was Replaced W/Qualified Model
References
LER-80-059-03L, LER-80-59-3L, NUDOCS 8005130619
Download: ML19309H653 (2)

LER-1980-059, /03L-0:on 800416,w/unit in Cold Shutdown,Msiv Found W/Nonqualified Limit Switch.Caused by Installation Error.Limit Switch Was Replaced W/Qualified Model

Event date:
Report date:
3661980059R03 - NRC Website

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!With the unit in cold shutdown, an inspection of the MSIV limit switches [

10131Iwas performed in response to NRC concerns.

One outboard MSIV was found l

l Lo_LdJ lto have a non-qualified limit switch installed in a location requiring a l IOisilqualified switch.

A similar event was reported in LER 50-321/1979-037.

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l:.[r]I he MSIV limit switches have no direct backup.

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33 35 3G 38 40 di CAUSE DEECRIPT!oN AND CORRECTIVE ACTIONS 42 43 44 47 j' li!DIIThis event was caused by an error in installation.

The limit switch was I lililtrenlaced with a cualified model. Unit 1 MSIV limi t switches were roolaced Iwith qualified models as per a cornmi tment made in LER 50-321/1979-037.

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50-366/1980-059 Licensee:

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Hatch Docket #:

50-366

Narrative

Report for LER 50-366/1980-059 With the unit in cold shutdown, an inspection of MSIV limit switches was performed in response to NRC concerns.

One non-qualified outboard MSIV, 2B21-F028A, was found to have a Namco model EA700 installed in the 90%

open location.

According to the limit switch retrofit manual, drawi#g no.

S-30830, all MSIV limit switches in the 90% open location were to be replaced with a qualified Namco model EA740, and all were to remain.

A limit switches in the full closed locac3-a qualified limit switch was found in the full closed location on MSIV 2B21-F028A.

Therefore, it is' believed that during the retrofit imp l eracn t a t i on,

the full closed limit switch on 2B21-F028A was replaced instead of the 90% open limit switch.

These two limit switches were interchanged prior to startup.

The limit switch retrofit manual was issued for Unit 2

in response to IEB 79-01.

Also in response to IEB 79-01, an inspection of the Unit 1 MSIV ' limit switches was performed.

All limit switches were found to be non-q ua li f i ed, and this was reported by LER 50-321/1979-037.

Namco model EA740 limit switches were installed on Unit I u-ver DCR 79-171 during the spring outage of 1979.

The MSIV limit switches have, no direct backup.

The non-qualified limit switch on 2B21-F028A was found to be functioning p r o p e'r l y,

so no unsafe condition existed due to this event.

This event caused no threat to public health or safety.

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