05000249/LER-1981-003-03, /03L-0:on 810120,Model 288 Differential Pressure Indicating switch,3-1349B,tripped Above Tech Spec Limit. Caused by Instrument Drift.Switch Readjusted & Repeatability Verified

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/03L-0:on 810120,Model 288 Differential Pressure Indicating switch,3-1349B,tripped Above Tech Spec Limit. Caused by Instrument Drift.Switch Readjusted & Repeatability Verified
ML20003B783
Person / Time
Site: Dresden 
Issue date: 02/18/1981
From: Magrow R
COMMONWEALTH EDISON CO.
To:
NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML17193A740 List:
References
LER-81-003-03L-01, LER-81-3-3L-1, NUDOCS 8102250513
Download: ML20003B783 (1)


LER-1981-003, /03L-0:on 810120,Model 288 Differential Pressure Indicating switch,3-1349B,tripped Above Tech Spec Limit. Caused by Instrument Drift.Switch Readjusted & Repeatability Verified
Event date:
Report date:
2491981003R03 - NRC Website

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's atroarcare so EVENr DEsCMimCN ANo PRCOASLE CCNSECUENCES h ro TT1 l During normal operation while performing isolation condenser condensate line hi-flowl g g calibration, dPIS 3-13493 tripped at 34 inches water colu=n differential pressure.

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F5TT1 I column. Safety significance is minimal because redundant switch would have providedt i o is 1 l isolation within Tech. Spec limit. Similar events:

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,,,3,l The cause for the setpoinC drift is unknown. The Barton Model 288 indicating switch, g ; was readjusted to trip at 29 inches water column differential pressure increasing I

,and repeatability was verified. DIS 1300- 2 will continue to be performed monthly l

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