ML19340D982

Forwards Supplemental Response to IE Bulletin 79-02, Revision 2, Pipe Support Base Plate Designs Using Concrete Expansion Anchor Bolts

ML19340D982
Person / Time
Site:	Washington Public Power Supply System
Issue date:	11/13/1980
From:	Mazur D WASHINGTON PUBLIC POWER SUPPLY SYSTEM
To:	Engelken R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V)
References
GO1-80-355, IEB-79-02, NUDOCS 8101060085
Download: ML19340D982 (3)

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Docket 50-460/513 ilovember 13, 1980 G01-80-355 i

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Mr. R. H. Engelken, Director Nuclear Regulatory Commission i

Region V Suite 202 Walnut Creek Plaza l

1990 N. California Boulevard i

Waltmt Creek, California 94596

Subject:

WPPSS Nuclear Projects Nos. 1/4 IE Bulletin 79-02, Revision 2,

" Pipe Support Base Plate Designs Using Concrete Expansion Anchor Bolts" and Releated Reportable Condition 10 CFR 50.55(e) Pipe Support Design

References:

1) G01-80-50, January 24, 1980 l

2) G01-80-278, September 25, 1980 l

3) G01-79-380, July 10, 1979 l

f In response to IE Bulletin 79-02 the Supply System has responded to the l

NRC per References 1, 2 and 3.

Reference 1 also contained information l

on a reportable design deficiency per the requirements of 10 CFR 50.55(e).

On November 5, 1980 Mr. Howard Wong of. the Technical Programs Branch in Washington, D.C. verbally requested supplemental information describing the design criteria for pipe supports before and after issuance of the 79-02 Bulletin.

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Washington Public Power Supply System t.s Mr. R. H. Engelken Page Two The requested suoplemental information is attached.

If you have any questions or require further information relating to WPPSS Projects 1 and 4, please advise.

y_Zgry jrul yours, Nf} f

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, WNP-1/4 uX : EWM: oe Attachment cc:

CR Bryant, Bonneville Power Administration JR Lewis, Bonneville Fower Administration V Stello, Director, NRC Office of Inspection & Enforcement H Ucna, Of fice of Inspection and Enforcement Eng. Files-1/4 (290) i l

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WPPSS UNITS 1 & 4

SUMMARY

OF CHANGES IN DESIGN CRITERIA FOR PIPE SUPPORTS Item Before NRC IE Bulletin 79-02 After NRC IE Bulletin 79-02 1.

Concrete Expansion Anchors A.

Baseplate flexibility not considered A.

Baseplate flexibility considered.

B.

Shear / tension interaction not con-Prying action incorporated.

sidered B.

Shear / tension iriteraction considered.

C.

Safety factor of four C.

Safety factor of 5.33 (1)

D.

Installation torques based on D.

Installation torques in Ref. I page manufacturer's recommendations.

3, item 4.

See min. installation torque. Ref 1 page 3 item 3.

2.

Frictional Loads A.

Designer's judgement with periodic (2)

A.

Considered in all cases (1) spot checks B.

Coef ficient of frictien =0.25 B.

Coefficient of friction =0.35 (1) 3.

Weld designs A.

ASME III requirements A.

ASME III requirements B.

Stress calculation required for (1) all cases.

4.

Allowable stress limits A.

ASME requirements A. ASME requirements (Support member designs)

B.

Stress calculation required for (1) all cases 5.

Embedment plates A.

AISC/ACI A.

AISC/ACI B.

Stress calculation required for (1) all cases Note:

1 The timing of the changes in UE&C's design criteria was coincidental to the issuance of the NRC IE Bulletin 79-02.

These changes were prompted by a refinement of UE&C's design requirements for pipe supports of WPPSS Units 1 & 4.

Note:

2 Designer's judgement based on experience with similar designs, design parameters, magnitude of load on support, etc.

Reference 1:

G01-80-50 Response to IE Bulletin 7?-02, Revision 2 dated January 24, 1980 e.

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