ML20085F621

Telecopy AO AO-74-17:on 740828,3/4-inch Vent Line on Letdown Line Dowmstream of Letdown Orifices Failed.Caused by Cracking.Letdown Line Isolated

ML20085F621
Person / Time
Site:	Palisades
Issue date:	08/29/1974
From:	Dewitt R, Lewis J CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.)
To:	Cook R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML20085F616	List: ML20085F612 ML20085F618 ML20085F621 ML20085F626
References
AO-74-17, NUDOCS 8308230071
Download: ML20085F621 (1)

Text

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THIS IS TO INFORM YOU OF AN INCIDENT THAT OCCURRED AT PALISADES AT i 2000 HOURS YESTERDAY 8/28/74. l THE INCIDENT WAS A FAILURE OF THE THREE-QUARTER INCH VENT LINE ON l

THE LETDOWN LINE JUST DOWNSTREAM OF THE LETDOWN ORIFICES. THIS l LINE FAILED BY CRACKING OVER 75 PERCENT OF ITS CIRCUMFERENCE JUST i ar.mi tABOVE THE WELD TO THE LETDOWN LINE. AT THIS TIME, THE FAILURE

_ .i MECHANISM IS NOT KNOWN.

AT THE TIME THE PLANT WAS IN THE PROCESS OF PLANT C00LDOWN AND WAS AT 400 DEGREES F. THE LEAK WAS FIRST NOTED BY INCREASED CHARGING REQUIREMENTS FOLLOWING RECOVERY FROM A SIMULATED DBA TEST. THE LETDOWN LINE WAS ISOLATED IMMEDIATELY AND NO FURTHER PROBLEM RESULTED.

THIS INCIDENT IS TENTATIVELY CALLED ABNORMAL OCCURRENCE 74-17 BASED O N ITEM C OF TECH i SPEC DEFINITIONS. -

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