05000280/LER-1979-042-01, /01T-0:on 791220,as Result of Pipe Stress Reanalysis on Show Cause Lines Outside Containment,Support on Line 10 CC-143-121 Found to Be Overstressed Beyond 50% Ultimate Capacity.Cause Not Stated.Mod Completed

/01T-0:on 791220,as Result of Pipe Stress Reanalysis on Show Cause Lines Outside Containment,Support on Line 10 CC-143-121 Found to Be Overstressed Beyond 50% Ultimate Capacity.Cause Not Stated.Mod Completed

ML18136A353
Person / Time
Site:	Surry
Issue date:	01/02/1980
From:	Stewart W VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML18136A352	List: 05000280/LER-1979-042, Forwards LER 79-042/01T-0 05000280/LER-1979-042-01, /01T-0:on 791220,as Result of Pipe Stress Reanalysis on Show Cause Lines Outside Containment,Support on Line 10 CC-143-121 Found to Be Overstressed Beyond 50% Ultimate Capacity.Cause Not Stated.Mod Completed
References
LER-79-042-01T, LER-79-42-1T, NUDOCS 8001040554
Download: ML18136A353 (2)

LER-1979-042, /01T-0:on 791220,as Result of Pipe Stress Reanalysis on Show Cause Lines Outside Containment,Support on Line 10 CC-143-121 Found to Be Overstressed Beyond 50% Ultimate Capacity.Cause Not Stated.Mod Completed

Event date:
Report date:
2801979042R01 - NRC Website

text

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LICENSEE EVENT REPORT

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1As a result of pipe stress reanalysis on show cause lines outside contairrnent, a

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1 support on line lO"CX:::-143-121, Unit No. 2 supply to the Spent Fuel Pit Coolirg Heat

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I Exchangers, was foun:l to be overstressed beyon:l 50 percent ultimate capacity. 'Ibis

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I event is reportable in accordance with Tech. Spec. 6.6.2.a.9 an:l the NRC order liftirg I

[§))] I suspension of unit operation dated August 22, 1979.

'Ihe health am safety of the

[§JI] I pub! ic were not affected.

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42 43 44 1Stress analysis calculations revealed that initiai configuration of the hanger did ITJJ] 1not meet acceptance criteria. lVJodification to the support was canpleted based upon [II2],preliminary design drawings prior to final stress calculation.

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50-280 EVENT MJ:

79-042/0lT-O E\\ENT DATE: 12/20/79 TITLE OF REPORT:

Excess Stress on Pipe Harger, Line 10"-0:::-143-121

1.

IBSCRIPI'ION OF EVENT:

llirir:g the pipe stress analysis it was discovered that a rupport on line 10"-

CC-143-121 was overstressed am exceeded 50 percent ultimate capacity.

'lhe event is reportable in accordance with the NRC order liftir:g ruspension of operation dated August 22, 1979, an:l Technical Specification 6.6.2.a.9.

This CX: water rupply for the Spent Fuel Pit Coolers canes fran the discharge side of "C" an:l "D" Canponent Coolir:g Heat Exchangers.

A breach of the affected line could negate the use of these Heat Exchar:gers.

'Jhe health an:l safety of the public were not affected.

3.

CAUSE OF EVENT

The architect er:gineer encountered the problem while comuctir:g the pipe stress analysis precipitated by the NRC Show Cause Order.

4.

IM\\1EDIATE ffiRRECI'IVE ACTION:

Corrective act ion taken was to rmdi fy the rupport iri accordance with preliminary design drawir:gs.

'Ihe modi fica:tion was canpleted prior to identification of overstressed comitions.

5.

SUBSH2()Em' a:ERECTI\\E ACTION:

Since rrxxlifications have been In1de to eliminate the overstressed con:litions, no subsequent action is required.

6.

roruRE CDRRECT'I VE ACTION:

7.

Modifications wi 11 be ma.de to relieve any additional overstress con:li-tions identified.

GENERIC Il\\Il?LICATIONS:

Analysis contirues on both units to discern am rectify all overstressed corrli tions.