05000316/LER-1980-005-03, /03L-0:on 791113,re-evaluation of Calibr Data Taken During Last Refueling Outage Revealed That Steam Line Pressure Transmitter Data Would Result in Nonconservative Differential Steam Line Pressure Setpoint for Loops 3 & 4

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/03L-0:on 791113,re-evaluation of Calibr Data Taken During Last Refueling Outage Revealed That Steam Line Pressure Transmitter Data Would Result in Nonconservative Differential Steam Line Pressure Setpoint for Loops 3 & 4
ML17326A540
Person / Time
Site: Cook 
Issue date: 02/28/1980
From: Rishcling J
INDIANA MICHIGAN POWER CO. (FORMERLY INDIANA & MICHIG
To:
NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML17326A539 List:
References
LER-80-005-03L, LER-80-5-3L, NUDOCS 8003040523
Download: ML17326A540 (2)
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LER-1980-005, /03L-0:on 791113,re-evaluation of Calibr Data Taken During Last Refueling Outage Revealed That Steam Line Pressure Transmitter Data Would Result in Nonconservative Differential Steam Line Pressure Setpoint for Loops 3 & 4
Event date:
Report date:
3161980005R03 - NRC Website
v • d • e

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SOURCE 60 61 DOCKET NUMBER 68 69 EVENT DATE 74 75 REPORT DATE 80 EVENT DESCRIPTION AND PROBABLE CONSEQUENCES ~IO A RE-EVALUATION OF CALIBRATION DATA TAKEN DURING THE LAST REFUELING OUTAGE REVEALED THAT THE AS FOUND DATA FROM THE STEAM LINE PRESSURE TRANSMITTERS WOULD RESULT IN

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~OS THE DIFFERENTIAL STEAM LINE PRESSURE SETPOINT FOR LOOPS 3 AND 4 BE NON-CONSERVATIVE IN RESPECT TO THE LIMIT SPECIFIED BY T.S.

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, 42 43 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS &27 THE EVALUATION OF THE TRANSMITTER CALIBRATION DATA FOR LOOPS 3 AND 4, TRANSMITTER-MPP 230 and 240, REVEALED THAT THE COMBINED ERRORS OF AS FOUND DATA WOULD HAVE RE-SULTED IN A IitAXIMUM POSSIBLE TRIP SETPOTNT OF 127.6 PSIG.

THIS ERROR IS ATTRIBUTED TO INSTRUMENT DRIFT.

THESE TRANSMITTERS HERE RECALIBRATED AND RETURNED TO SERVICE.

THESE TRANSMITTERS ARE MANUFACTURED BY FOXBORO MODEL NO.

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