ML20056F177

Requests That Util Provide Comparison Between Criteria in App F of USAR & Ascm to Show That Ascm Meets Median Centered Definition

ML20056F177
Person / Time
Site:	Fort Calhoun
Issue date:	08/10/1993
From:	Steven Bloom Office of Nuclear Reactor Regulation
To:	Tira Patterson OMAHA PUBLIC POWER DISTRICT
References
GL-87-02, GL-87-2, TAC-M69447, NUDOCS 9308260151
Download: ML20056F177 (3)

Text

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, Docket No. 50-285 August 10, 1993 Mr. Terry. L. Patterson Division Manager - Nuclear Operations Omaha Public Power District .

Fort Calhoun Station FC-2-4 Adm.  !

Post Office Box 399 Hwy. 75 - North of Fort Calhoun Fort Calhoun, Nebraska 68023-0399  !

SUBJECT:

EVALUATION OF CLARIF O ~.0N OF 120-DAY RESPONSE TO SUPPLEMENT 1 TO '

GENERIC LETTER 87-02 t0R FORT CALHOUN STATION (TAC NO. M69447)

By letter dated February 11, 1993, responding to the NRC staff's evaluation  !

dated November 30, 1992, you provided clarifying information and reassured the staff of your intention to implement both the Seismic Qualification Utility r Group (SQUG) commitments and Generic Implementation Procedure, Revision 2 l (GIP-2) Guidance. [

In your response, Omaha Public Power District (0 PPD) agreed with the staff's  !

assessment of the instructure response spectra as " median centered" rather  ;

than " conservative design." However, OPPD indicated that it may optionally i use Alternate Seismic Criteria and Methodology (ASCM) as " median centered" '

spectra. Even though ASCM has been approved by the staff, its applicability, e as approved, is limited to certain components or conditions and is, therefore, (

not generic.  ;

In view of this fact, OPPD should provide to the staff a comparison between  ;

the criteria in Appendix F of the Updated Safety Analysis Report and the ASCM  !

to show that ASCM meets the " median centered" definition. If the results are found to be satisfactory, then the response spectra generated on the basis of ASCM can be considered as " median centered." This information question was discussed by the NRC staff and OPPD staff on August 9, 1993. As discussed [

during the telecon, we anticipate that your responses to our request for >

additional information will be submitted within 30 days. If you have any

• questions about this matter, please do not hesitate to call me at 301-504-1313. This requirement affects fewer than 10 respondents and, therefore, is l not subject to Office of Management and Budget review under Public Law 96-511.  ;

Sincerely, ORIGINAL SIGNED BY:

Steven D. Bloom, Project Manager Project Directorate IV-1 120(;C-- Division of Reactor projects - ilifiv/v Office of Nuclear Reactor Regulation  ;

cc: See next page i DISTRIBUTION: '

Docket File NRC & Local PDRs PD4-1 Reading J. Roe  !

A. B. Beach, RIV E. Adensam H. Rood S. Bloom P. Noonan ACRS(10) (P-315) OGC(15B18) C. P. Tan 0FC LA:PD4-17M PM:PD4-1 D(A):PD4-1 7 l

NAME PNoonan J'

SBloom k HRood h v hi h

DATE 8/O/93 Tjlo /93 T/@/93  !

COPY YES/1{h kES)NO YES/NO f0l10 HLE CM IB COPY l OfflCIAL REC (iiiD COPY lTocument Name: FC69447.rai 9308260151 930810 PDR ADDCK 05000285 P pop ,

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..,,# )W i g UNITED STATES

• 5i -! NUCLEAR REGULATORY COMMISSION yN, ,/ WASHINGTON, D.C. 20555-0001 August 10, 1993 Docket No. 50-285 Mr. Terry. L. Patterson Division Manager - Nuclear Operations Omaha Public Power District Fort Calhoun Station FC-2-4 Adm.

Post Office Box 399 Hwy. 75 - North of Fort Calhoun Fort Calhoun, Nebraska 68023-0399 ,

SUBJECT:

EVALUATION OF CLARIFICATION OF 120-DAY RESPONSE TO SUPPLEMENT 1 TO GENERIC LETTER 87-02 FOR FORT CALHOUN STATION (TAC N0. M69447)

By letter dated February 11, 1993, responding to the NRC staff's evaluation dated November 30, 1992, you provided clarifying information and reassured the staff of your intention to implement both the Seismic Qualification Utility i Group (SQUG) commitments and Generic Implementation Procedure, Revision 2 (GIP-2) Guidance.

In your response, Omaha Public Power District (OPPD) agreed with the staff's i assessment of the instructure response spectra as " median centered" rather than " conservative design." However, OPPD indicated that it may optionally use Alternate Seismic Criteria and Methodology (ASCM) as " median centered" spectra. Even though ASCM has been approved by the staff, its applicability, as approved, is limited to certain components or conditions and is, therefore, not generic.

In view of this fact, OPPD should provide to the staff a comparison between the criteria in Appendix F of the Updated Safety Analysis Report and the ASCM to show that ASCM meets the " median centered" definition. If the results are  :

found to be satisfactory, then the response spectra generated on the basis of ASCM can be considered as " median centered." This information question was discussed by the NRC staff and OPPD staff on August 9, 1993. As discussed ,

during the telecon, we anticipate that your responses to our request for additional information will be submitted within 30 days. If you have any questions about this matter, please do not hesitate to call me at 301-504-1313. This requirement affects fewer than 10 respondents and, therefore, is not subject to Office of Management and Budget review under Public Law 96-511.

Sincerely,  !

9; Steven D. Bloom, Project Manager Project Directorate IV-1  ;

Division of Reactor Projects - III/IV/V Office of Nuclear Reactor Regulation  ;

cc: See next page l

. ' '. s.

Mr. Terry L. Patterson c

Omaha Public Power District Fort Calhoun Station, Unit No. I cc:  ;

Harry H. Voigt, Esg.

LeBoeuf, Lamb, Leiby & MacRae '

1875 Connecticut Avenue, NW Washington, D.C. 20009-5728 ,

Mr. Jack Jensen, Chairman Washington County Board of Supervisors -

Blair, Nebraska 68008 i

Mr. Raymond P. Mullikin, Resident Inspector U.S. Nuclear Regulatory Commission Post Office Box 309 r Fort Calhoun, Nebraska 68023 '

Mr. Charles B. Brinkman, Manager Washington Nuclear Operations ,

Combustion Engineering, Inc.

12300 Twinbrook Parkway, Suite 330 Rockville, MD 20852 e i

Regional Administrator, Region IV  ;

U.S. Nuclear Regulatory Commission f 611 Ryan Plaza Drive, Suite 1000 '

Arlington, Texas 76011 Harold Borchert, Director Division of Radiological Health Nebraska Department of Health 301 Centennial Hall, South Post Office Box 95007 Lincoln, Nebraska 68509 ,

Mr. James W. Chase, Manager Fort Calhoun Station Post Office Box 399 Fort Calhoun, Nebraska 68023 i

e I