ML19254B270

Supplements 790607 Ltr Re Status of Containment Vessel Design Alternatives.Forwards Black & Veatch 790706 Recommendation for Reducing Dynamic Loads on Piping Due to Containment Vessel Response

ML19254B270
Person / Time
Site:	Black Fox
Issue date:	07/10/1979
From:	Jason West PUBLIC SERVICE CO. OF OKLAHOMA
To:	Gallo J ISHAM, LINCOLN & BEALE
Shared Package
ML19254B263	List: ML19254B262 ML19254B265 ML19254B270 ML19254B271
References
NUDOCS 7909270037
Download: ML19254B270 (3)

Text

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ExWM K PUBUC SERVICE COMPANY OF OKLAHOMA PI r . ,, ,;

A CENTRAL AND SOUTH WEST COMPANY k *)j P.O. BOX 2o1/ TULSA. OKLAHOMA 74102 / (918) 583-3811 Public Service Company of Oklahoma July 10,1979 Black Fox Station

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JUL 141979 JLWhuutd Mr. Joseph Gallo Isham, Lincoln & Beale 105017th St. N.W. , 7th Floor Washington, D. C. 20036

Dear Mr. Gallo:

Supplementing my June 7 transmittal of information on the status of BFS containment vessel design alternatives is the attached letcar from Black &

Veatch containing their current recommendation for reducing dynamic loads on piping due to containment vessel response.

Black & Veatch presented their recommendation at a BFS management meeting on June 20 at which time PS0 concurred with their recommendation to change the basis of their design effort to the extended foundation mat. It is ray under-standing that, subsequent to the June 20th meeting, Mr. Vaughn Conrad indicated to you that a revision of the B&V recortmendation had been made and the attached letter would be transmitted to you outlining our present direction and design status.

Very truly yours, s

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Jo n B. West -

Manager, BFS Engineelik3 y

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f J.K.Ma rtin E.A.Maas QDQ C.J.Ross-Black & Veatch

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BLACK & VEATCH X 6212 DIN 28865 TE L. ( 913 ) 967 2000 CONSUL. TING ENGINEERS TELEX 42 6263 1500 M E ADOW LAKE PARKWAY aetsuo anomassi e o. som wo. esos KANSAS CITY. MISSCU RI 64114 Public Service Company of Oklahoma B&V Project 6212 Black Fox Station File: 6212.215.3?.30.21 Reactor Building - Containment Vessel July 6, 1979 I Ref: 6212 DIN 23227 Public c ervice Company of Oklahoma P. O. Box 201 RECEIVED AND FILED Tulsa, OK 74102 JUL 9 1979 Attention: Dr. J. B. West Manager, BFS Engineering PROJECT DOCUMENT CONTROL Gentlemen:

This letter supplements our letter dated June 5, 1979, which addresses the status of our design efforts regarding the phenomena of containment vessel ringing.

In accordance with our recommendations as provided in the above referenced letter, design activities from June 5, 1979, through June 20, 1979, were directed toward use of a strutted containment vessel. In parallel to ths .e activities we continued our review of the feasibility of other atential options.

As a result of this review, we have developed and now recomnand the use of a modification of the extended foundation mat option as described in our June 5, 1979, letter. In our opinion, the modified extended mat option offers considerably more design margin than the strutted containment option.

It also provides a more economic solution and is compatibic. with the current schedule. The revised extended foundation mat option is based upon uncoupling the extended mat support from the Shield Building, thereby simplifying design interfac i between the structures and allowing Shield Building construction to proces. as originally planned.

We have discussed the revised option with your staff on June 20, 1979. Based upon their concurrence at that meeting we have subsequently redirected our design efforts. Accordingly, we are proceeding with the development of revised structural response data and incorporation of the extended mat design into the Containment Vessel and the foundation mat. Modifications to the  ;

existing structural design will include additional vertical Ma'n.- I D

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i' ff BFS ENGmEERIE J

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• B t. 'A C K & VEATCH Public Service Company of Oklahoma 2 B&V Project 6212 Dr. J. B. West July 6, 1979 in the foundation mat outside the Containment Vessel and a change from Containment Vessel hoop stiffeners to vertical stiffeners. The extended foundation mat concrete will be placed following erection of the Shield Buildine -4 Containment Vessel to the top of the suppression pool area.

Should you have any questions regarding this matter, please contact us.

Very truly yours, BLACK & VEATCH C. . Ross DFG:dlw 1045 012