ML20198G478

Forwards Request for Addl Info Re Structural Aspects of post-CP Mods to Seismic Design of Cranes

ML20198G478
Person / Time
Site:	Washington Public Power Supply System
Issue date:	07/06/1976
From:	Knight J Office of Nuclear Reactor Regulation
To:	Office of Nuclear Reactor Regulation
References
CON-WNP-1125 NUDOCS 8605290616
Download: ML20198G478 (4)

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Docket Nos. 50-460 and 50-513

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Assistant Director for Light Water Reactors i

i Division of Project Management REVIEW 0F ATTACmiENT C " SEISMIC QUALIFICATIONS OF THE POLAR, CASK H# IDLING AND NEW FUEL HANDL!NG CRANES", POST-CP MODIFICATIONS TO DESIGN PROPOSED BY WASHINGTON PUBLIC POWER SUPPLY SYSTEM (WPPSS) FOR WNP UNITS NO.1 AND 4 (TAR 4)916)(SEB:1143 AND 1155)

Plant Name: WNP Units No.1 & 4 I

Docket Nos.: 50-460/50-513 Licensing Stage: Post-CP Review Branch and Project Manager Requesting Assistance: LWR-l. Tom Cox Requested Completion Date: July 15, 1976 Technical P4 view Dranches Involved: Structural Engineering Branch Aux 111.ary Power & Conversion Systems Branch Description of Request: To Review Modifications to Seismic Design of Cranes Review Status: Waiting for Information In accordance with your request the Structural Engineering Branch, Division, of Systems Safety, has reviewed and evaluated structural aspects of the requested PSAR changes. In order to continue our review, we find more information is needed. The required information relating to structural aspects is contained in the enclosure.

J. Knight, Acting Assistant Director for Engineering Division of Systems Safety Enclosui e: As Stated cc (Hext Page)

SEE PREVIOUS CONCURRENCE PAGE l

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50-460 l

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Assistant Director fbr Light Water Reactors Division of Project Management REVIEW OF ATTAC!!!iENT C " SEISMIC QUALIFICATIONS OF THE POLAR, CASK I

HANDLING AND NEW FUEL HANDLIf1G CRANES", POST-CP tt0DIFICATIONS TO DESIGN l

PROPOSED BY WASHIfiGTON PUBLIC POWER SUPPLY SYSTEM (WPPSS) FOR f

WNP UNITS N0e 1AND4(TAR-3916) (SEB:ll43AND1155)

Plant flame: VNP Units No.1 & 4 Docket Hos.: 50-450/50-513 Licensing Stage: Post-CP Review Branch and Project Manager Requesting Assistance: LUR-1. Tom Cox Requested Completion Date: July 15, 1976 Technical Review Branches Involved: Structural Engineering Branch Auxilf ary Power & Conversion Systems Branch Description of Request: To Review Modifications to Seismic Design of Cranes Review Status: Waiting for Infonnation l

In accordance with your request the Structural Engineering Branch, Division of Systems Safety, has reviewed and evaluated structural aspects of the requested PSAR changes. In order to continue our review, we find more information is needed. The required inforr.ation relating to structural aspects is contained in the onclosure.

R. R. Maccary, Assistant Director for Engineering Division of Systems Safety

Enclosure:

As Stated cc (flext Page)

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R. Boyd W. Mcdonald cc w/ enc 1:

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Docket Files:

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STRUCTURAL ENGINEERING BRANCH REQUEST FOR INFORMATION N

h,=;c WNP UNITS NO. 1 & 4 1.

Your assumption No.1 means that the RV head will drop in a theoretically horizontal position.

Provide:

(a) justification for such an assumption, and i

(b) the consequence of the RV head drop in an inclined position.

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p.Yk 2.

For assumption No. 2, provide the equations relating potential g

energy to kinetic energy and to strain energy in the system.

i 3.

Indicate the manner in which the shock factor used in assumption No. 3 is determined and provide a numerical example.

" 4.

Case number 2 of Roark's " Formula for Stress and Strain"

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4th edition page 371 deals with* 1inear elements such as beams M

and ruds. The reactor vessel is a shell structure. Provide L

the justification for using such a simplification in computing

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the inertia af ter impact as indicated in assumption No. 4.

5.

Explain and amplify your statement on top of page 3 indicating

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specifically how the elastic / plastic effects of concrete supports g

are considered and what are the design limits of the reactor

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vessel and RV supports.

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