05000366/LER-1979-040-01, /01T-0 on 790523:during Repair Outage,Two Feedwater Flow Elements Found Piped to Wrong Low Pressure Taps.Caused by Personnel Error During Const.Flow Elements Were Repiped to Correct Taps

/01T-0 on 790523:during Repair Outage,Two Feedwater Flow Elements Found Piped to Wrong Low Pressure Taps.Caused by Personnel Error During Const.Flow Elements Were Repiped to Correct Taps

ML19259C281
Person / Time
Site:	Hatch
Issue date:	05/31/1979
From:	Thomas Greene GEORGIA POWER CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19259C276	List: 05000366/LER-1979-040, Forwards LER 79-040/01T-0 05000366/LER-1979-040-01, /01T-0 on 790523:during Repair Outage,Two Feedwater Flow Elements Found Piped to Wrong Low Pressure Taps.Caused by Personnel Error During Const.Flow Elements Were Repiped to Correct Taps
References
LER-79-040-01T, LER-79-40-1T, NUDOCS 7906140531
Download: ML19259C281 (3)

LER-1979-040, /01T-0 on 790523:during Repair Outage,Two Feedwater Flow Elements Found Piped to Wrong Low Pressure Taps.Caused by Personnel Error During Const.Flow Elements Were Repiped to Correct Taps

Event date:
Report date:
3661979040R01 - NRC Website

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EVENT oESCRIPTICN Ara 0 PRCS ABLE CONSEQUENCES E I During the hanger recair maintenance outaae it was found that feedwater flow elements I

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Event Description ar.d Probable Consequencesdifferential pressure data.

This data indicated that the maximum differen-ces in reading between the correct and cross-connected calibration runs ne.ver exceeded the maximum tap set to tap set difference in any correctly i

connected calibration runs which proves the feedwater flow error flow cross-

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connection to be insignificant. This is a non-repetitive occurrence.

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NARRATIVE

LER 79-040-01-T-0

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i On May 23, 1979, during the hanger repair maintenance outage it was dis-covered by an engineer making a routine inspection that the feedwater ficw elements 2C32-t!001 A and B were piped up incorrectly to the low pressure taps as indicated by the Instrument Installation Details and Instrument Instructions manual.

The taps to which the flow elemen't was installed did not have flow calibration data since flow data was only furnished for I,

the tap sets, not for a cross connection.

The as-installed configuration had the high pressure taps on tap set 2 and the low pressure taps on tap l

set 1.

The manufacturer of the flow element, the Permutit Company, was consulted and it was found that Permutit had also taken crosss-tap differ-I ential pressure data.

This data indicated that the maximum differences in reading between the correct and cross-connected calibrations runs nev-er exceeded the maximum tap set to tap set difference in any correctly connected calibration run which proves the feedwater flow error flow-cross-l

. connection to be insignificant for this non-repetitive occurrence.

i The cause for this inadvertent cross-connection of the. feedwater flow I

taps was a personnel error made at the site during construction stages.

The flow elements were repiped to tap set 2 taps as required by the orig-

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inal design.

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