05000325/LER-1982-028-03, During Routine Surveillance,Comparison of RTGB Indications of Suppression Chamber Water Level Revealed 2.2-inch Level Difference. Caused by Loss of Trickle Flow Transmitter to Wet Ref Leg

During Routine Surveillance,Comparison of RTGB Indications of Suppression Chamber Water Level Revealed 2.2-inch Level Difference. Caused by Loss of Trickle Flow Transmitter to Wet Ref Leg

ML20028D332
Person / Time
Site:	Brunswick
Issue date:	01/05/1983
From:	Pastva M CAROLINA POWER & LIGHT CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20028D330	List: 05000325/LER-1982-028-03, During Routine Surveillance,Comparison of RTGB Indications of Suppression Chamber Water Level Revealed 2.2-inch Level Difference. Caused by Loss of Trickle Flow Transmitter to Wet Ref Leg
References
LER-82-028-03L, LER-82-28-3L, NUDOCS 8301170429
Download: ML20028D332 (2)

LER-1982-028, During Routine Surveillance,Comparison of RTGB Indications of Suppression Chamber Water Level Revealed 2.2-inch Level Difference. Caused by Loss of Trickle Flow Transmitter to Wet Ref Leg

Event date:
Report date:
3251982028R03 - NRC Website

text

NRC FORM 386 U. S. NUCLE AR REGULATORY COMMISSION (7"

Update Report LICENSEE EVENT REPORT 4

2' Previous Report Date:

3-25-82 1

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CONTROL BLOCK: l l

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7 8 9 LICENSEE CODE 14 15 LICENSE NUMBER 25 26 LICENSE TYPE JO b7 CAT $8 con T i lol1l En$ l L Igl 0 l 5 l 0 l-l 0 l 3 l 2 l 5 @l 0 l 3 l 0 l1 l 8 l 2 @]0 l1 l0 l5 l8 l3 l@

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60 61 OOCK ET NUVSER 68 69 EVENT DATE 14 75 REPORT DATE 80 EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h i

lol2l l During routine surveillance, a comparison of RTGB indications of suppression chamber l

,o g l water level revealed that RTGB instrument, 1-CAC-LR-2602, indicated a level of -30" l

lol4llwhile RTCB instrument, 1-CAC-LI-2601-3 indicated a level of -27.8".

A check of the l

1 joi,,; l local level indicator determined the actual level to be -26".

This value exceeded l

lthe specified upper limit and is being reported in LER l-82-31.

This event did not l

0 6 jol7 l affect the health and safety of the public.

l Technical SpecificaLions 3.3.5.3, 6,9.1.9b l

ois 80 SYSTEM

CAUSE

CAUSE COMP.

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40 41 42 43 44 47 CAUSE DESCRWTION AND CORRECTIVE ACTIONS h IilollA loss of trickle flow to the wet reference lec of onch instrnmont's resoective l

i i l transmitter, 1-CAC-LT-2602 and LT-2601, Model No. B015221, caused both traT.4mitters l

lto send incorrect input signals to their particular indicators. The trickle flow was l 1

7 l i l 3 l l properly established and each transmitter was calibrated and returned to service.

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% POWE R OTHER STA TUS IS O RY DISCOVERY DESCRIPTION NA l lA l@lOperatorSurveillance l

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8301170429 830105 NRC USE ONLY rUnociTv DR ADOCK 05000325 PDR l

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NAME OF PREPARER PHONE:

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LER ATTACHMENT - RO #1-82-28 Facility:

BSEP Unit No. 1 Event Date: March 1, 1982 As a result of an event involving this instrumentation, as reported in LER 1-81-07 and several recent LERs, and a post-T'!I requirement, plant modification packages (1-80-79 and 80-016 for Unit No. 1 and 2-80-78 and 80-017 for Unit No. 2) have been developed. These modifications will install condensing pots in the reference legs in order to increase the accuracy and reliability of these instruments, and remove the requirement to have flow in the reference legs to ensure they are full.