05000334/LER-1980-017-01, /01T-0:on 800326,reanalysis of Seismic Pipe Stress of Main Steam Piping Inside Valve House for OBE long-term Criteria Showed,For Some Conditions,Allowable Stress Level May Be Exceeded in Headers for Main Steam Relief Valves

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/01T-0:on 800326,reanalysis of Seismic Pipe Stress of Main Steam Piping Inside Valve House for OBE long-term Criteria Showed,For Some Conditions,Allowable Stress Level May Be Exceeded in Headers for Main Steam Relief Valves
ML19305D794
Person / Time
Site: Beaver Valley
Issue date: 04/08/1980
From: Werling J
DUQUESNE LIGHT CO.
To:
NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19305D782 List:
References
LER-80-017-01T, LER-80-17-1T, NUDOCS 8004150529
Download: ML19305D794 (2)
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LER-1980-017, /01T-0:on 800326,reanalysis of Seismic Pipe Stress of Main Steam Piping Inside Valve House for OBE long-term Criteria Showed,For Some Conditions,Allowable Stress Level May Be Exceeded in Headers for Main Steam Relief Valves
Event date:
Report date:
3341980017R01 - NRC Website
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's RE* ORT C Art do EVENT CESCRIPTION ANO PROB ABLE CONSEQUENCES h The reanalysis of the seismic pipe stress of the main steam piping inside the l

O I2l l valve house for the OBE long term criteria indicates that for certain load l

gl conditions the code allowable stress level may be exceeded in the headers that l

l o 14 l l 10 I s l I support the main steam safety relief valves. When the safety relief blowdown loads l f5Ts 1 l are combined with the OBE, pressure and dead load stresses, the computer code i

l o 171 l allowabic stress icvel of 1.25h is exceeded in the headers. The reanalysis of the I

!olal I remainder of the main steam piping inside the valve house (continued on attached) l 60 7

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lilo g ] The original calculations of record which qualified the headers were reviewed.and l

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,,2j l local stress calculation using the PITRUST omputer code but had not been

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a Attachment To LER 80-17/01T Beaver Valley Power Station Duquesne Light Company Docket No. 50-334for the OBE case is still in progress. Since the plant is shutdown for refueling and maintenance, there is no potential safety hazard existing.

Cause Description And Corrective ActionsEquation 9 tests must be met, which was not done. The comparison equations are being completed at the present time.

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