ML19257A918

LER 79-045/03L-0:on 791204,channel B Steam Generator Water Level Read Approx 15 Inches Lower than Other Three Channels. Caused by Low Output of Transmitter 2-LT-1123B Due to Deformed Differential Pressure Block Seal Diaphragm

ML19257A918
Person / Time
Site:	Calvert Cliffs
Issue date:	01/03/1980
From:	Hiebel R, Rizzo P BALTIMORE GAS & ELECTRIC CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19257A917	List: ML19257A916 ML19257A918
References
LER-79-045-03L-01, LER-79-45-3L-1, NUDOCS 8001090388
Download: ML19257A918 (1)

Text

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LICE.NSEE EVENT REPORT CONTROL BLOCK- l 1

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, 8 60 61 DOCK ET NUMB ER 68 .69 EVENT DATE REPORT DATE EVENT DESCRIPTION AND PROBABLE CONSEQUENCES Oio O 2 At 0300 on December 4,1979, Channel B Steam Generator water level was  ;

O 3 l reading approximately 15" lower than the other three channels. Channel B  ;

O 4 l Steam Generator water level low trip unit was placed in bypass in accordance O s [ wi th T.S. 3.3.1.1. Channel B was returned to service at 1400 on December  ;

O s i 4, 1979. During this time period the reactor was in Mode 2. This is not ,

O 7 l a repetitive occurrence. g O 8 l 7 8 9 80 DE CODE' SUSC DE COMPONENT CODE SL 8COOE SU T

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i o l Transmitter 2-LT-1123B was found to have a low output when static system pressure  ;

m I was applied. Investigation showed one differential pressure block seal diaphragm i

, 2 I was slightly defonned. The transmitter will be returned to its manufacturer for ,

i 3 I reoair. A stock spare was installed in its place. No cause has been determined [

i A I to explain the problem.  ;

STA  % POWER - OTHER STATUS 015 O RY DISCOVE DESCRIPTION i s [J j @ l 01 0 Ol@l NA . l lBl@l Operator Observa" tion 0

ACTIVITY CO TENT -

AMOUNT OF ACTIVITY -

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LOSS OF OR DAMAG TO FACJLITY .

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OESCRIPTION 80010903g[ NRC use ONtv e 2 O LliJ81 NA I IIIIIiiiIiiiI:

7 8 9 10 68 69 ' ' 80 3 NAME OF PREPARER PHONE: (301)234-7943/7986 g