ML18009A425

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Submits Supplemental Response to Station Blackout Rule Based on Guidelines Provided in NUMARC 87-00, Guidelines & Technical Bases for NUMARC Initiatives.... No Changes to Previous Calculations Necessary & One Deviation Noted
ML18009A425
Person / Time
Site: Harris Duke Energy icon.png
Issue date: 03/30/1990
From: CUTTER A B
CAROLINA POWER & LIGHT CO.
To:
NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
NLS-90-072, NLS-90-72, NUDOCS 9004100005
Download: ML18009A425 (5)


Text

REGULATORY INFORMATION DISTRIBUTION SYSTEM (RIDS)ACCESSION NBR:9004100005 DOC.DATE: 90/03/30 NOTARIZED:

NO FACIL:50-400 Shearon Harris Nuclear Power Plant, Unit 1, Carolina AUTH.NAME AUTHOR AFFILIATION CUTTER,A.B.

Carolina Power&Light Co.RECIP.NAME RECIPIENT AFFILIATION Document Control Branch (Document Control Desk)DOCKET 05000400

SUBJECT:

Submits supplemental response to station blackout rule.DISTRIBUTION CODE: A050D COPIES RECEIVED:LTR ENCL 8 SIZE:" TITLE: OR Submittal:

Station Blackout (USI A-44)10CFR50.63, MPA NOTES:Application for permit renewal filed.A-22 05000400 RECIPIENT ID CODE/NAME PD2-1 PD INTERNAL: ACRS NRR/DET/ESGB SD NRR DST S BSE FILE 0 EXTERNAL: LPDR NSIC COPIES LTTR ENCL RECIPIENT ID CODE/NAME BECKER,D NRR PD1-4PM TAM NRR/DST/SPLBSD1 NUDOCS-ABSTRACT NRC PDR COPIES LTTR ENCL NOTE TO ALL"RIDS" RECIPIENTS:

PLEASE HELP US TO REDUCE WASTE!CONTACT THE.DOCUMENT CONTROL DESK, ROOM Pl-37 (EXT.20079)TO ELIMINATE YOUR NAME FROM DISIRIBUTION LISTS FOR DOCUMENTS YOU DON'T NEED!TOTAL NUMBER OF COPIES REQUIRED: LTTR 15 ENCL

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"~CSIRL Carolina Power&Light Cotnpany P.O.Box 1551~Raleigh, N.C.27602 SERIAL: NLS-90-072 10CFR50.63 MAR 80 19go A.B CUTTER Vice President Nuclear Services Department United States Nuclear Regulatory Commission ATTENTION:

Document Control Desk Washington, D.C.20555 SHEARON HARRIS NUCLEAR POWER PLANT DOCKET NO.50-400/LICENSE NO.NPF-63 SUPPLEMENTAL RESPONSE TO STATION BLACKOUT RULE Gentlemen:

On March 3, 1989, Carolina Power&Light Company (CP&L)submitted a response to the Station Blackout (SBO)Rule (10CFR50~63)based on the guidelines provided in NUMARC 87-00,"Guidelines and Technical Bases for NUMARC Initiatives Addressing Station Blackout at Light Water Reactors." On January 4, 1990 NUMARC issued a letter requesting each utility to supplement the SBO submittals to the NRC with a letter indicating that either the previous response was based on the use of the NUMARC 87-00 guidance, including the clarification in attachments to the January 4, 1990 NUMARC letter, or any deviations from the accepted NUMARC 87-00 guidance have been or will be clearly indicated.

Carolina Power&Light Company has reviewed the January 4, 1990 NUMARC letter and our previous response to the SBO Rule for the Shearon Harris Nuclear Power Plant (SHNPP).Based on our review,'o changes to our previous calculations were necessary, and one deviation from the NUMARC 87-00 methodology was identified.

The results of the review are detailed below.1.Deviation from NUMARC 87-00 Guidelines and Methods The control room temperature rise calculation was based on an earlier CP&L comprehensive calculation.

This calculation was performed to determine the time interval for the control room temperature to rise to 95'F during an SBO induced loss of air conditioning.

Using this calculation as a base, NUMARC 87-00 guidance was employed to determine that the control room temperature would rise to ill'F during a four-hour SBO event.In order to document the engineering judgement:

on what areas of the plant were dominant areas of concern (DAC), selected areas were analyzed utilizing the methods of NUMARC 87-00.The results of these evaluations resulted in no additional DAC's being identified based on a comparison of the calculated temperature and the lowest values noted in Appendix F.9004100005 900330 PDR ADOCK 05000400 P PDC 1

V0 Document Control Desk (NLS-90-072)

/Page 2 The two areas that were identified as potential DAC's were the Main Steam Tunnel (150'F)and the RAB 236 elevation Mechanical Penetration Area (121.8'F).

Both of these temperatures were well below the equipment operability limits of Appendix F limits for equipment located in these areas so they were judged not to be DAC's.2.Emer enc Diesel Generator EDG Tar et Reliabilit A target EDG reliability of 0.95 was selected for use in the evaluations based on the performance of the plant's EDGs.It is CP&L's under-standing that this target reliability is to be maintained consistent with the final resolution of Generic Issue B-56.Carolina Power&Light Company's previous SBO submittal for SHNPP, as modified by this letter, is based on the guidelines provided in NUHARC 87-00 and the clarifications issued by NUMARC on January 4, 1990.Applicability of the NUHARC 87-00 assumptions is documented in our files.If you should have any questions, please contact Mr.S.D.Floyd at (919)546-6901.You-very t y, JCP/ecc (661ECC)A.B Cutter cc: Mr.R.A.Becker Mr.S.D.Ebneter Mr.Alex Marion (NUMARC)Mr.J.E.Tedrow