ML20033G889

Forwards Request for Addl Info Re Reanalysis of Vertical Steel Tanks.Response Requested within 90 Days Following Receipt of Ltr

ML20033G889
Person / Time
Site:	Callaway
Issue date:	04/04/1990
From:	Athavale S Office of Nuclear Reactor Regulation
To:	Schnell D UNION ELECTRIC CO.
References
TAC-71762, NUDOCS 9004120310
Download: ML20033G889 (4)

Text

_

April 4, 1990

• Docket No. 50-4B3 DISTRIBUTION:

BR W r.YTT&T~3 NRC & Local PDRs Mr. Donald F. Schnell PDIII-3 r/f JZwolinski Senior Vice President - Nuclear JHannon SVAthavale Union Electric Cc:.nany PKreutzer OGC-WF1 Post Office Box 149 EJordan ACRS(10)

St. Louis, Missouri 63166 PDIII-3 Gray

SUBJECT:

RE0 VEST FOR ADDITIONAL INFORMATION (RAI), REAHALYSIS OF VERTICAL STEEL TANKS, CALLAWAY UNIT 1 (TAC NO. 71762)

The staff is continuing its review of your September 21, 1989 response to our May 23, 1989 letter concerning)the seismic design considerations for the refueling water storage tank (RWST.

Following the audit of the Bechtel i

calculations on February 14, 1990, the staff requestt additional information identified in the enclosure to continue its review.

You are requested to respond to the enclosure within 90 days following receipt of this letter.

The reporting and/or recordkeeping requirements contained in this letter affect fewer than 10 respondents; therefore, OMB clearance is not required under Pub. L.96-511.

i Sincerely.

W l

S. V. A'thavale, Project Manager Project Directorate III-3 i

Division of Reactor Projects - III IV, V, and Special projects Office of Nuclear Reactor Regulation

Enclosure:

As stated cc w/ enclosure:

See next page DOCUMENT NAME: 71762 RAI ll YW Office:

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Surname: ffanitar TGody/tg/ T JHannon l

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April 4,1990 Docket No. 50-483 Mr. Donald F. Schnell Senior Vice President - Nuclear Union Electric Company Post Office Box 149 St. Louis, Missouri 63166

SUBJECT:

. REQUEST FOR ADDITIONI.L INFORMATION (RAI), REAHALYSIS OF VERTICAL STEEL TANKS, CALLAWAY UNIT 1 (TAC NO. 71762)

The staff is continuing its review of your September 21, 1989 response to our May refueling water storage tank (RWST.23, 1989 letter conce,ning)the seismic design co Following the audit of the Bechtel calculations on February 14, 1990, the staff requests additional.information identified in the enclosure to continue its review.

You are requested to respond to the enclosure within 90 days following receipt of this letter..

The repnrting and/or recordkeeping requirements contained in this letter affect fewer than 10 respondents; therefore, OMB clearance is not reouired under Pub. L.96-511.

Sincerely, h

\\~-L -

S. V. Athavale, Project Manager Project Directorate III-3 Division of Reactor Projects - III IV, V, and Special projects Office of Nuclear Reactor Regulation

Enclosure:

i As stated cc w/ enclosure:

See next page i

a i

'e i

4 Mr. D. F. Schnell Callaway Plant i

Union Electric Company Unit No. 1 i

cc:

Dr. J. O. Cermack Mr. Bart D. Withers CFA Inc.

President and Chief 4 Professional Dr., Suite 110 Executive Officer Gaithersburg, MD 20879 Wolf Creek Nuclear Operating Corporation Gerald Charnoff, Esq.

P. O. Box 411 Thomas A. Baxter, Esq.

Burlington, Kansas 66839 Shaw, Pittman, Potts & Trowbridge i

2300 N Street, N. W.

Mr. Dan I. Bolef, President Washington, D. C.

20037 Kay Drey, Representative t

Board of Directors Coalition Mr. T. P. Sharkey for the Environment Supervising Engineer, St. Louis Region Site Licensing 6267 Delmar Boulevard Union Electric Company University City, Missouri 63130 Fost Office Box 620 Fulton, Missouri 65251 U. S. Nuclear Regulatory Commission 1

Resident Inspectors Office RRf1 Steedman, Missouri 65077 Mr. Alan C. Passwater, Manager Licensing and Fuels Union Electric Company Post Office Box 149 St. Louis, Missouri 63166 Manager - Electric Department Missouri Public Service Commission 301 W. High Post Office Box 360 Jefferson City, Missouri 65102 l

Regional Administrator U. S. NRC, Region III 799 Roosevelt Road i

Glen Ellyn, Illinois 60137

{

i Mr. Ronald A. Kucera, Deputy Director Department of Natural Resources P. G. Box 176

)

Jefferson City, Missouri 65102 l

i l

REQUE" 41Dl!!ONAL INFORMATION REAF

' # VERTICAL STEEL TANKS'

'!.AWAY UNIT 1 1.

During the audit, it was discovered that the forces and stresses on the roof angle connecting the cylinder and the roof under the postulated seismic loadings were not available. Hence the adequacy of the angle and the angle welds could not be verified.

Provide information (sumarize risults) related to the adequacy of the connection under the postulated seismic loads.

2.

During the audit, it was discovered that the conclusion of "no tension" in any part of the tank anchor bolts and foundation was based on the use of an AISI formula, which the staff considers inappropriate.

Provide information (summarize results) regarding the adequacy of the affected tank areas under the postulated seismic loadings. Specifically, the following items should be included:

a. Adequacy of the anchor bolts and the bolt lugs (or chairs),

b. Adequacy of the tank shell in tension and in compression.

c. Stresses in foundation media and the adequacy of the reinforced I

concrete section under the sump.-

d. Potential for overturning of the tank and the foundation.

e. Potential for sliding of the tank and the foundation.

The method of combining the responses of the three components of the postulated earthquakes should be in accordance with the FSAR comitment, j

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