05000364/LER-1981-028-03, /03L-0:on 810717,main Control Board Steam Flow Indicator of FT-474 Instrumentation Loop Failed High.Caused by Transmitter Vent Pipe Break Due to Use of Oversized Valve in Sensing Line.Lighter Valve Installed

/03L-0:on 810717,main Control Board Steam Flow Indicator of FT-474 Instrumentation Loop Failed High.Caused by Transmitter Vent Pipe Break Due to Use of Oversized Valve in Sensing Line.Lighter Valve Installed

ML20010D218
Person / Time
Site:	Farley
Issue date:	08/18/1981
From:	Hairston W ALABAMA POWER CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20010D212	List: 05000364/LER-1981-028-03, /03L-0:on 810717,main Control Board Steam Flow Indicator of FT-474 Instrumentation Loop Failed High.Caused by Transmitter Vent Pipe Break Due to Use of Oversized Valve in Sensing Line.Lighter Valve Installed 05000364/LER-1981-031-03, /03L-0:on 810718,pressurizer Level Indicators LI-459,460,461 & 462,pressurizer Heaters,Wide Range RCS Pressure Channel PT402,pressurizer Pressure PT-455 & 456,RCS Pressure PT402 & Subcooling Monitors Input Inoperable ML20010D211
References
LER-81-028-03L-01, LER-81-28-3L-1, NUDOCS 8108240106
Download: ML20010D218 (1)

LER-1981-028, /03L-0:on 810717,main Control Board Steam Flow Indicator of FT-474 Instrumentation Loop Failed High.Caused by Transmitter Vent Pipe Break Due to Use of Oversized Valve in Sensing Line.Lighter Valve Installed

Event date:
Report date:
3641981028R03 - NRC Website

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2 Event o scmPHON AND PRCEA3LE COS.SicuENcES h [3 12j l At 0610 on 7-17-81, the instrumentation loop associated with steam flow transmitter I

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!i i o i !The use of an oversized valve in a sensing line which had higher than expected vibration j

[i i ! contributed to the fatigue failure of the line. Following installation of a lighter valve & 1 g,, _ ; ; satisfactory completion of the surveillance test, the FT-474 instrumentation -loop was returnqd

! i: i Lto service at 2210 on 7-19-81. All similar instrumentatior, vent lines were also insoected I

and valves replaced. No such similar condition exists in Unit 1 since the heavier valve was [iiai l selected for use in Unit 2 because of an error on a vendor drawing.

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