ML20010A769

Submits Supplemental Response to IE Bulletin 79-02.Allowable Pullout Loads on 1-inch Hilti Anchors Have Been Reduced to Reflect Lower Ultimate Tensile Loads.Table of Revised Allowable Loads Encl

ML20010A769
Person / Time
Site:	Diablo Canyon
Issue date:	07/21/1981
From:	Crane P PACIFIC GAS & ELECTRIC CO.
To:	Spencer G NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
References
IEB-79-02, IEB-79-2, NUDOCS 8108120200
Download: ML20010A769 (3)

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Docket No. 50-275, 50-323/79-02 r .

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Mr. Get .Je Spencer, Director Divisi.;r.of Technical Inspection "

Pagi's V G) l I , b U_ S. Nuclear Regulatory Catmission Office of Inspection and Enforcment 1990 N. California Boulevard fQ p hf U(f 7 Walnut Creek Plaza, Suite 202

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\ u.s.coamen m ,gJun Re: Docket No. 50-275 Docket No. 50-323 Diablo Canycn Units 1 and 2 N /.f.c -- .

Dear Mr. Spencer:

This letter suppl ments our previous responses to IE Bulletin 79-02 by addressing the potential impact of reduced ultimate tensile values for one-inch diameter HILTI expansion anchors.

As indicated 'n our May 5, 1981 letter to you, we have reduced the allwable pullout loads on one-inch HILTI anchors to reflect the lower ultimate tensile loads provided by HILTI and to carply with the IE Bulletin 79-02 requirment for a safety factor of at least 4. The pull-out allwables on page 8 of attachment II, in our letter to you dated Dec m ber 3, 1980, w re revised accordingly. This revision is shmn in the attachment to this letter. The new values do not change our previous conclusions. Our revi s identified one pipe support with bolts which did not meet the required safety factor. 'Ittis support has been modified to Itcet the required safety factor. Had this change not been made, the potential effect on safety would have been minimal since the supporc bolts wculd have had a safety factor of 3.9 or only 2.5's belw the required value.

11ll d<s 010812O200 810721 PDR ADDCK 05000275

'O PDR

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Mr. George Spencer July 21, 1981 The loger allowable loads for one-inch HILTI anchors have been used by PGandE sinx March 5,1981, and are being applied to all new '

piping support desig.m and to the Diablo Canyon Unit 2 review for IE Bulletin 79-02. 'Ihis ascures that the required safraty factors will be met in all cc.ses.

Very truly ycurc, J'

Attachrent /

CC: Servien List

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ATTACHMENT Revised Allowable Loads From: Teledyne Engineering Services Technical Report TR-4121-2, Pace 8 4000_ 6000

~ Diam. Paed. Pu/4 Vu/4 Pu/4 Vu/4 1" 4-1/2 4000 6720 5125 8028 5 4725 6720 5860 (a) 8028 6 5860 (a) 6720 5860 8023 7 5860 6723 5860 8028 8 5860 8623 5860 9098 9 5860 8623 5860 e 9098 10 5860 8623 5860l 9098

,1-1/4" 5-1/2" 5750 8920 7800 11,298 6-1/2" 6775 8920 9125 11,298 7-1/2" 7775 8920 10,500 11,298 4

8-1/2" 8650 8920 11,100 11,774 9-1/2" 9450 8920 11,100 11,774 10-1/2" 1G,225 8920 11,100 12,399 PHILLIPS WEDGE MIN. EMB.

Catalog Teledyne Use Values Values from These*

Generic Program Size Pu/4 Vu/4 Pu/4 Vu/4 Pu/4 Vu/4 1/2" 1475 2100 1313 1750 1313 1750 5/8" 1956 3000 2563 3313 1956 3000 3/4" , 2875 4250 2375 4438 2375 4250 7/8" 2950 6225 3354 4875 2950 4875 1" 4075 8850 5958 10,000 4075 8E50 1-1/4" 10,150 12,150 7000 11,250 7000 11,250

• Lowest Value (a) Revised Values

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