ML19291C511

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Forwards 800104 Memo in Reponse to IE Bulletin 79-02, Revision 2, Pipe Support Base Plate Designs Using Concrete Expansion Anchor Bolts. Util Policy Prohibits Use of Concrete Blocks to Support Permanent Plant Feature
ML19291C511
Person / Time
Site: Fermi DTE Energy icon.png
Issue date: 01/07/1980
From: Hines E
DETROIT EDISON CO.
To: James Keppler
NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
References
IEB-79-02, IEB-79-2, NUDOCS 8001240525
Download: ML19291C511 (4)


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Edward Hines A5S s'dM V C e hP91rn!

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m Edison an,w~r..~ ~

January 7, 1980 EF2-47,353 Mr. James G. Keppler Regional Director U.S. Nuclear Regulatory Commission Region III DI ~

799 Roosevelt Road Glen Ellyn, Illinois 60137

Dear Mr. Keppler:

Subject:

Detroit Edison Response to USNRC IE Bulletin 79-02, Revision 2 A description of the measures by Edison to achieve full compliance with the requirements of the subject b..'.letin ic provided by the attached mer.orandum, EF2-47,598 and the previous letters referenced therein. D ring a future visit by your inspectors, our Project Engineering group will be prepared to discuss the construction and des *3n surveys planned to assure compliance with bulletin items 5 and 6.

If you require further input for this bulletin, please advise us.

Very truly yours,

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YWtt 1r EH/TGB/lm Enclosure cc: Mr. John G. Davis Acting Director Office of Inspection and Enforcement Division of Reactor Inspection Programs U.S. Nuclear Regulatory Commission Washington D.C. 20555 1793 200 JAN" 1980 JAN 9 1980 8001240

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Detroit Edison ENRICO FERMI UNIT 2 PROJECT ENGINEERING January 4, 1980 EF2 - 47,598 TO: R. W. Barr Project Quality Assurance Director FROM: W. F. Colbert Project Engineer QC/ g g.4,y

REFERENCES:

1) USNRC IE Bulletin 79-02, Revision 2
2) EF2 - 45,399 dated July 6, 1979
3) EF2 - 50,578 dated October 8, 1979 SUBJFCT: Response to Bulletin 79-02 Revision 2 Engineering believes that Items 1 thru 4 of the subject IE Bulletin have already been completely addressed via References 2) and 3); therefore, this memorandum is intended to provide the supplemental information required to address Items 5 and 6.

Those items, and our responses to the requests for information therein, are discussed below:

Request No. 5 Determine the extent that expansion anchor bolts were used in concrete block (masonary) walls to attach piping supports in seismic Category I systems...

Response No. $

Project policy generally prohibits the support of any perma-ne r. t plant features, except minor items such as lighting conduits, from concrete block or plank walls. This policy was not formalized in a procedure or specification during the period of time that shell anchors were in use. This policy was formalized when the project switched to wedge anchors and now no anchors are allowed in any block or plank walls.

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R. W. Barr January 4, 198(

EF2 - 47,598 Page 2 The safety related pipe supports that have been installed with shell anchors must still be inspected per the bulletin for embeddeent, size, etc. A: item will be added to the check list to verify that none of these anc' ors are installed in block or plank.

If, during the course of the survey, it is determined that safety-related pipe supports have been supported off concrete block or plank walls, the following course of action will be implemented.

a) The pipe support will be moved, or redesigned, so that it derives its main support from the reinforced concrete or steel structure or...

b) Appropriate tupplemental design anolyses will be conducted to insure that the pipe support, its anchorages, and the concrete block or plank wall maintain their required structural integrity during a postulated site seismic event.

Request No. 6 Determine the extent that pipe supports with expansion anchor bolts used structural steel shapes instead of base plates.

Response No. 6 In general, safety-related pipe support designs which rely on direct bolting of structural members to the reinforced concrete structure are not utilized, since the relatively narrow flanges of these shapes forces the designer to derate the capacity of the anchors extensively in order to account for shear-cone interaction.

In order to effectively address the concerns expressed in IE Bulletin 79-02, Revision 2, a design survey will be conducted to determine if any safety-related pipe support designs have been released which rely on direct bolting of structural steel shapes to the building structure. If any such designs are identified, the below stated course of action will be implemented.

1793 202

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R. W. Barr

's January 4, 1980 EF2 - 47,598 Page 3 a) Appropriate analysis will be performed to satisfy the concerns of the subject bulletin or...

b) The attachment will be modified by stiffening or adding a base plate to satisfy the concerns of the bulletin.

This will be done in the same manner as the analysis required by the original bulletin.

We believe that the above information, together with references

2) and 3) provides a complete response to IE Bulletin 79-02, Revision 2. If you require our further input, please advise.

WFC/JHC:jl Written by J. H. Casiglia ec: C. R. Bacon L. Bertani T. H. Dickson K. J. Dempsey W. M. Everett W. J. Fahrner S. H. Noctzel M. G. Sigetich

s. Spiers W. M. Street R. A. Vance H. A. Walker Document Control 1793 2JD3

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