ML19322A069
| ML19322A069 | |
| Person / Time | |
|---|---|
| Site: | Black Fox |
| Issue date: | 10/31/1978 |
| From: | Varga S Office of Nuclear Reactor Regulation |
| To: | Ewing T PUBLIC SERVICE CO. OF OKLAHOMA |
| Shared Package | |
| ML19322A068 | List: |
| References | |
| NUDOCS 7901020164 | |
| Download: ML19322A069 (3) | |
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A UNITED STATES g cig),.g'j j'N,
' NUCLEAR REG'." ATORY COMMISSloN WASHINGTON, D. C. 20555
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Docket Nos: STN 50-556 STN 50-557 D
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Mr. T. N. Ewing, Manager
' ' Black-Fox Station Nuclear Project Public Service Company of Oklahoma P. O. Box 201-
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Tulsa, Oklahoma 174102 Gentlemen:
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SUBJECT:
MEIHODOLOGY IUR;COSSINING DYNAMIC RESPONSES OF STRUCTURES, SYSTEMS AND COMPDNENTS IMPORTANT 'ID SAFETY (BLACK IDX STATION, UNIT NOS,1 AND 2)
In Supplement No.1 to our Safety Evaluation Report related to the construction of the proposed Black Fox Station, Unit No.1 and 2, NUREG-0190, we indicated that we were evaluating generically the methodology for corchining the dynamic responses of structures, systems and components important to safety. We further indicated that we expected to have avnilnble the results of our evaluation of this matter by mid-Septercher 1978.
A working group was established to develop reco cendations for combining dynamic responses in the analyses of structures, systems and components important to safety. The working group has completed j
its evaluation of this matter and its findings are documented in a report entitled " Report on Methodology for Combining Dfnamic Responees,"
NUREG-0484,.a copy of which is enclosed. We. hare adopted the working group's recommendations which. states:
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"For dhe codbination of the dynamic responses within the Reactor Coolaht Pressure Boundary (RCPB) and its supports, which result from the coincidence of an SSE and LOCA, the
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Square Root of the Sums of the' Squares (SRSS) teclutique is acceptable contingent upon performance of a linear clastic dynamic analysis to meet the appropriate ASbE code,Section III, Service Limits."
This conclusion ciu~1orses a limited'ap;ilication of the square-root-
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of-the sum-of-the-squares (SRSS) methodol.-gv; namely, to the reactor coolant pressure boundary. The report' does 2.ct preclude future extension of the SRSS method to other systems or components, or to y
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3 OCT 311978 Mr. T. N. Ewing '
other load combinations when appropriate bases have been demonstrated, and provittes guidance as to the additional work that should be pursued tc attain that goal, but suggests that such bases' have not yet been sufficiently quantified. The staff has these suggestions under consideration for incorporation in our long-term studies.
For all such other systems or components or load combinations not included in the conclusions of the staff report, NUREG-0484, we require conformance to present criteria for the load combination methodology.
We request that you amend your application to reflect a commitment to perfona the required dynamic analyses for the proposed Black Fox Station structures, systems and components i por tant to safety in' accordance with the provisions of working gloup's report. Should you desire further information or wish to meat with us concerning this matter, please contact Cecil Thomas, Project Manager for the proposed Black Fox Station.
Sin 6,crely,
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j Light Water Reactors anch No. 4 Division of Project Management
Enclosure:
Report on Methodology for Combining Dynamic Responses cc: See next page f
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" BLACK FOX STATION SERVICE LIST XC:
L. Dow Davis, Esquire Joseph R. Farris. Esquire William D. Paton, Esquire John R. Woodard, III, Esquire Colleen Woodhear, Esquire Green, Feldman, Hall & Woodard Counsel for NRC Staff 816 Enterprise Building U. S. Nuclear Regulatory Commission Tulsa, Oklahoma 74103 Washington, D. C.
20555 Mr. Cecil Thomas 1437 South Main Street, Suite 302 U. S. Nuclear Regulatory Commission Tulsa, Oklahoma 74119 Phillips Building 7920 Norfolk Avenue Mrs. Ilene H. Younghein Bethesda, Maryland 20014 3900 Cashion Place Oklahoma City, Oklahoma 73112 Mr. Jan A. Norris Environmental Projects Eiranch 3 Mr. Lawrence Burrell U.S. Nuclear Regulatory Commission Route 1, Box 197 Phillips Building Fairview, Oklahoma 73737 7920 Norfolk Avenue Bethesda, Maryland 20014 Mrs. Carrie Dickerson Citizens Action for Safe Energy, Inc.
Mr. William G. Hubacek P. O. Box 924 U.S. Nuclear Regulatory Commission Claremore, Oklahoma 74107 Office of Inspection and Enforcement Region IV 611 Ryan Plaza Drive, Suite 1000 Arlington, Texas 76012 Mr. Gerald F. Diddle General Manager Associated Electric Coop 'ative, Inc.
P. O. Box 754 Springfield, Missouri 65801 Mr. Maynard Human General Manager Western Fanners Electric Cooperative P. O. Box 429 Anadarko, Oklahoma 73005 Michael I. Miller, Esq.
Isham, Lincoln & Beale One 1st National Plaza Suite 4200 Chicago, Illinois 60603 Mr. Joseph Gallo Isham, Lincoln & Beale 1050 17th Street N.W.
Washington, D. C.
20036 1
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