05000334/LER-1980-044-01, /01T-0:on 800630,review Showed Existing Steam Generator Snubber Embedment Design Does Not Reflect as- Constructed Embedment Condition.Cause Not Yet Determined

/01T-0:on 800630,review Showed Existing Steam Generator Snubber Embedment Design Does Not Reflect as- Constructed Embedment Condition.Cause Not Yet Determined

ML19320C957
Person / Time
Site:	Beaver Valley
Issue date:	07/11/1980
From:	Lacey W DUQUESNE LIGHT CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19320C955	List: 05000334/LER-1980-044, Forwards LER 80-044/01T-0 05000334/LER-1980-044-01, /01T-0:on 800630,review Showed Existing Steam Generator Snubber Embedment Design Does Not Reflect as- Constructed Embedment Condition.Cause Not Yet Determined
References
LER-80-044-01T, LER-80-44-1T, NUDOCS 8007180322
Download: ML19320C957 (2)

LER-1980-044, /01T-0:on 800630,review Showed Existing Steam Generator Snubber Embedment Design Does Not Reflect as- Constructed Embedment Condition.Cause Not Yet Determined

Event date:
Report date:
3341980044R01 - NRC Website

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REPORT DATE 80 EVENT OESCRIPTION AND PRO 8A8LE CCNSEQUENCES h FTTT1 IDuquesne Light Company has been informed by the BVPS Unit 1 Architect-Engineer that al pgy] l review showed that the existing steam generator snubber embedelent design does not l

l reflect the "as constructed" condition of the embedment. The original Calculations j i o i.: l [oisl l assumed that the load was applied normal to the embedment surface rather than skewed.l However.

l n5Ts'l IThe original calculations considered loads due to pipe break and seismic.

lo17l Ithe calculations were not updated to reflect the revised seismic loads and loads

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34 35 36 37 40 44 42 43 g4 47 33 CIUSE OESCRIPTION ANO CORRECTIVE ACTIONS h IiioJ [A review of the original load calculations revealed these deficiencies. We have I

Ireceived revised load calculations from Westinghouse for two loadn whfch are believedi i i i,,23lco reflect the " worst case condition". As expected, the revised loads are below the [

iit31l design loading and the concrete at the embedments has been found to exceed the l

[TTTI le.esigned strencth by 2500 PSI.

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Attachment To LER 80-44/0lT Beaver Valley Power Station Duquesne Light Company Docket No. 50-334 Event Description And Probable Consequences boundary of the neutron shield tank. The result was the establishment of non-conservative loads for the embedment anchors.

Cause Description And Corrective Actions study by the Architect-Engineer is still in progress but results are expected to be acceptable based on the reduced applied loads and superior concrete strength.

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