ML20010H545

LER 81-142/03L-0:on 810819,both Channels of post-accident Containment Sump Level Instrumentation Indicated Water Levels W/No Water in Sump.Caused by Transmitters Shifting Out of Calibr Due to High Temp Conditions

ML20010H545
Person / Time
Site:	McGuire
Issue date:	09/18/1981
From:	Nardoci P DUKE POWER CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20010H544	List: 05000369/LER-1981-142, Forwards LER 81-142/03L-0.Detailed Event Analysis Encl 05000369/LER-1981-142-03, /03L-0:on 810819,both Channels of post-accident Containment Sump Level Instrumentation Indicated Water Levels W/No Water in Sump.Caused by Transmitters Shifting Out of Calibr Due to High Temp Conditions
References
LER-81-142-03L, LER-81-142-3L, NUDOCS 8109240607
Download: ML20010H545 (1)

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NRC FOAM 364 tr.ns U. S. NUCLEAR RECULATORY CCMMisstols LICENSEE EVENT REPORT EXHIBIT A CONTROL block: l l l l i l l lQ .

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EVENT oEscruPDoN ANo PROS A8LE CONSECUENCES h (TTTI !While in Mode 2, both channels of the post-accident containment sump level l I o i s j il nstrumentation Indicated water levels when no water was in ti:e sump, anc' eere I o . l subsequently declared inoperable.

This violates T.S.3.3.3.6 which is renort- I i,,, lable pursuant to T.S.6.9.1.13 (b). Since the transmitters involved provide  ; ,

io aigno safety related function and are not necessary for accident mitigation, the l la lil [inoperability of this equipment had no effect on the safe operation of the i go 9 ,iplant or the health and safety of the public. I of coot susc E couPohENT oCf suaCoof Su (

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CAUSE CESCMIPTICN ANo CCARECf1VE ACitoNs h li t o i [ The zero level outputs of the containment sump level transmitters (Barton,  ;

,, iij I Model 386) had shifted and caused the transmitters to be out of calibration. t

,, ,7, i The instruments were functicning in a higher temperature environment than  ;

i,,,j; installation conditions, causing the fluid filled bellows to expand and con- ]

,,,,g tact the housing walls. The housing walls were bored or machined down to allqw 7

e i tree movement. so

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llIlfIflll[ll NAME ca eREr4RER Phillio B. Nardoci isoNE: (70ld 17t.71,19 28109240607 810918 PDR ADOCK 05000369 S PDR m .-. . . , . -,_-_. ___ _ _ - - - - -

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