ML20209D527

Forwards Request for Addl Info Re Designs of Piping & Pipe Supports in Order to Complete Audit Intiated During Wk of 841022-26

ML20209D527
Person / Time
Site:	05000000, Diablo Canyon
Issue date:	11/07/1984
From:	Bosnak R Office of Nuclear Reactor Regulation
To:	Schierling H Office of Nuclear Reactor Regulation
Shared Package
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References
FOIA-86-197 NUDOCS 8411160302
Download: ML20209D527 (2)

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UNITED STATES NUCLEAR REGULATORY COMMISSION j

WASHINGTON, D. C. 20555

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MEMORANDUM FOR: Hans E. Schierling, Project Manager Licensing Branch #3 Division of Licensing q~

FROM:

Robert J. Bosnak, Chief t

Mechanical Engineering Branch j

Division of Engineering

SUBJECT:

DIABLO CANYON UNIT NO. 2 REQUEST FOR ADDITIONAL 3

INFORMATION I

I During the week of October 22-26, 1984 the NRC staff personnel and consultants l

visited the PG&E/Bechtel offices to audit designs of piping and pipe supports at Diablo Canyon Unit No. 2.

Based on this audit, the staff has determined i

that the infonnation contained in the attached " Request for Additional Information" will be required before a satisfactory conclusion can be reached i

regarding the adequacy and qualification of Diablo Canyon Unit 2 piping and i

pipe supports.

i i

ob J. Bosnak, Chief Mechanical Engineering Branch Division of Engineering l

Attachment:

As stated cc:

R. Vollmer, DE J. P. Knight, DE

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G. Knighton, DL M. Hartzman, DE

.i CONTACT:

M. Hartzman, DE:MEB, X28445 t

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• 1 Attachment No. 1 DIABLO CANYON UNIT N0. 2 REQUEST FOR ADDITIONAL INFORMATION i

1.

Provide the methodology used by W for piping support base plate analysis, including flexibility effects. Thow that this has been reviewed and

- accepted by the DCP, and that it corresponds to that used by PG&E and Bechtel.

2.

Provide the verification of the computer program PIPSAN used by W for analyzing piping supports. Show that this program has been reviewed, verified and approved by the DCP.

i 3.

Show that the DCP has verified that W has included in the W piping 4

i support design criteria all changes reflected in DCM-M9, Rev.11 l

" Guidelines for Design of Class 1 Supports."

4 I

4.

Provide the basis for specifying a tolerance of 10% on modulus of elasticity as stated in PG&E " Procedure for Piping Stress Analysis, Diablo Canyon Units 1 and 2," Procedure P-11, Rev. 7, and W document AM-SSA-2577, Vol. 1, Rev. 3, March 1983.

5.

Provide the procedures and design docunents used by Bechtel-Gaithersburg l

for the analysis of piping and piping supports at Diablo Canyon Unit No.

l 2, including the document " Project Instruction Manual for Piping

.l Stress Analysis-DC 2, Job. No. 15320-003, Rev. 1."

I 6.

Provide the following W documents:

a. C0-107, Rev. 5 " Pipe Support and Evaluation Procedure" Diablo Canyon Unit 2

b. PIPSAN (Pipe Support Analysis) Users Manual, Rev. O,1983.

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