ML19262B993

LER 79-101/03L-0:on 791217,during Mode 1 Operation,Refueling Water Tank Level Indicator 2LI-5636-1 Failed High.Caused by Freeze Protection Heat Tracing Not Operating Properly, Allowing Transmitter Sensing Line to Freeze

ML19262B993
Person / Time
Site:	Arkansas Nuclear
Issue date:	01/16/1980
From:	Shively C ARKANSAS POWER & LIGHT CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
Shared Package
ML19262B988	List: ML19262B987 ML19262B993
References
LER-79-101-03L, LER-79-101-3L, NUDOCS 8001220390
Download: ML19262B993 (1)

Text

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NRC FORM 3t,4 U. S. NUCL E AR REGUL ATORY COMMtsSION (7 ??)

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EvtNT D.TE +4 it HfPOHYQATE So EVENT DESCRIPTION AND PROBAOLE CONSEOVENCES h to_u) I During Mode 1 operation. Refuelina Water Tank level indicator. 2LI-5636-li, o i failed high. The RWT low level trip (RAS) signal on PPS Channel "A" was 1o 1411 byoassed nor the reauirements of Action Statement T. S. Table 3.3-3.6.b#91.

in isi i The remaining RWT level indications were verified to be nonnal. i o o Similar occurrences are LER's 50-368/79-008.79-002, & 79-001 i g i eportable R per T. S. 6.9.1.9.b. i O u l l C E of SveC E L OMPONE NT Lout st of n 9 I I lE m!@ L,E,-J@ L,, X_J@ I INI S T I RI Ul@. [T j@ @@

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40 41 41 43 44 43 CAUSE DESCR,PTION AND CORREC flVE ACTIONS h li 1o 1 i Freeze protection heat tracing was not ooerating cronerly. allowing I

, , i transmitter sensing line 'to freeze. Investigation revealed temperature i i 7 I sensor was located inside building recently ennstructed arnnnd nlant i FrTTl I acid tanks: therefore. it could not monitor ambient temperature. Heat trace

, i controller was placed in manual until sensor could be moved outside buildjing.

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'- ' ' 'o u .3 n NAME OF PREPARER Chris N. Shively ,ucq, 501/968-2519 8001220 .3'70