ML20213E665

Forwards Branch Section to Sser 1 Re Hydrodynamic Loads Outside Containment,In Response to Util 830616 Request. Concurs W/Applicant Conclusion That Original Reactor Bldg Seismic Response Spectra More Severe than New Responses

ML20213E665
Person / Time
Site:	Columbia
Issue date:	11/04/1983
From:	Lear G Office of Nuclear Reactor Regulation
To:	Schwencer A Office of Nuclear Reactor Regulation
References
CON-WNP-0672, CON-WNP-672 NUDOCS 8311140462
Download: ML20213E665 (2)

Text

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fl0V 4 1983 l'EP.0EA!!DL'M FOR: Albert Schwencer, Chief I.icensing Branch !!c. 2 Division of Licensing FROM:

George Lear, Chief Structural and Geotechnical Engineering Branch Division of Engineering

SUBJECT:

WNP-2 PYDPODYNA!!IC L0f.DS OUTSIDE C0!:TAlfil!E!iT Peference:

Letter from G. D. Pouchey of UPPSS to A. Schwencer dated June 16, 1983 At the request of R. fuluck, Project l'anager of OttP-2, the Structural and Gentechnical Engineering 3 ranch has reviewed the attachr.ent tr the referenced letter and is enclosirg herewith our sectico to the SSER 1.

Ue concur with the applicant's conclusion th2t the criginal reactor building seismic response spectra outside the contairrent result in dynanic responses nere severo or as severe as rne comparable new ccebined responses involving seismic and hydrodynanic loads.

Orl;ba!.* ped ty GaoC ' N George lear, Chief Structural and Centechnical Engineerirg Paranch Division of Engineering Enclosura:

As stated cc:

J. P. Knight

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6 3.7.2 The SGEB staff has reviewed the information provided on June 16, 5

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1983 by the applicant on the effect of hydrodynamic loads on l

structures, systems and components outside the contair. ment.

The j

applicant originally used the lumped mass-spring model to obtain the reactor building seismic respons~e spectra outside the j

containment, with damping values lower than those specified in 4

Reculatory Guide 1.61.

For the new loading combinations 1

j involving the hydrodynamic loads and the seismic loads, the reactor building response spectra outside the containment are i

t obtained by using the finite element method with damping values

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j in conformance with Reculatory Guide 1.61. On the basis of the i

j results of the two methods as presented by the applicant, the i

i staff concurs with the applicant's cerclusion that the original i

l reactor building seismic response spectra outside the containment in most cases result in dynamic responses more severe than, or at i

j least as severe as, the comparable combined responses involving 1

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seismic and hydrodynamic loads.

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