ML18009A363

Responds to NRC Bulletin 88-008, Thermal Stratification in Piping Connected to Rcs. Design Differences That Either Minimize Potential of Occurrence or Enhance Possibility of Detection Should Scenario Be Created at Plant Determined

ML18009A363
Person / Time
Site:	Harris
Issue date:	01/26/1990
From:	Cutter A CAROLINA POWER & LIGHT CO.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
IEB-88-008, IEB-88-8, NLS-90-015, NLS-90-15, NUDOCS 9002080027
Download: ML18009A363 (4)

Text

ACCELERAT DISTMBUTION DEM(%TFA.TION SYSTEM REGULATORY INFORMATION DISTRIBUTION SYSTEM (RIDS)

ACCESSION NBR: 9002080027 DOC. DATE: 90/01/26 NOTARIZED: YES DOCKET FACIL:50-400 Shearon Harris Nuclear Power Plant, Unit 1, Carolina 05000400 AUTH. NAME AUTHOR AFFILIATION CUTTER,A.B. Carolina Power & Light Co.

RECIP.NAME RECIPIENT AFFILIATION Document Control Branch (Document Control Desk)

SUBJECT:

Responds to NRC Bulletin 88-008, "Thermal Stratification in Piping Connected to RCS."

DISTRIBUTION CODE: IE16D COPIES RECEIVED:LTR ENCL SIZE: c TITLE: Bulletin Response 88-08 Thermal Stress in Piping to RCS.

C NOTES:Application for permit renewal filed. 05000400 RECIPIENT COPIES RECIPIENT COPIES ID CODE/NAME LTTR ENCL ID CODE/NAME LTTR ENCL PD2-1 LA PD2-1 PD BECKER,D INTERNAL: AEOD/DOA AEOD/DS P/TPAB NRR HARTZMAN,M NRR HUM,M NRR REEVES,E.A. NRR/DET/EMEB9H3 NRR/DOEA/OEAB11 NRR/DOEA/OGCB11

. NRR/DREP/PEPB9D NRR/DST/ 8E2

~PMAS ILRB12 NUDOCS-ABSTRACT R FILE 02 RES/DSIR/EIB GN ILE 01 EXTERNAL: LPDR NRC PDR NSIC D

D NOTE TO ALL "RIDS" RECIPIENTS:

D PLEASE HELP US TO REDUCE WASTE! CONTACT THE DOCUMENI CONTROL DESK, ROOM Pl-37 (EXT. 20079) TO ELIMINATEYOUR NAME FROM DISTRIBUTION LISIS FOR DOCUMENTS YOU DON'T NEED!

TOTAL NUMBER OF COPIES REQUIRED: LTTR 21 ENCL ~ 0

~

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Carolina Power 8 Light Company P.O. Box t 551 ~ Raleigh. N.C. 27602 JAN 26 1990 A. 8 CUTTER SERIAL: NLS-90-015 Vice President Nuclear Senrices Department United States Nuclear Regulatory Commission ATTENTION: Document Control Desk Washington, DC 20555 SHEARON HARRIS NUCLEAR POWER PLANT DOCKET NO. 50-400/LICENSE NO. NPF-63 RESPONSE TO NRC BULLETIN 88-08 Gentlemen:

Carolina Power & Light Company (CP&L) hereby submits additional information as requested by NRC Bulletin 88-08, "Thermal Stratification in Piping Connected to Reactor Coolant Systems," for the Shearon Harris Nuclear Power Plant (SHNPP). Reporting Requirement No. 2 of NRC Bulletin 88-08 requires that licensees submit a letter confirming the completion of Bulletin Actions 2 and

3. The purpose of this letter is to confirm that these actions have been completed at SHNPP.

The completion of Bulletin Action 2 was previously documented in CP&L letter dated September 28, 1988. Bulletin Action 3 requires that licensees plan and implement a program to provide continuing assurance that unisolable sections of all piping connected to the RCS will not be subjected to combined cyclic and static thermal stresses that could cause fatigue failure during the remaining life of the unit. This continuing assurance program was implemented at SHNPP during the last refueling outage. This assurance was provided by instrumenting the subject piping to detect adverse temperature distributions and by establishing appropriate limits on temperature distributions.

By letter dated April 11, 1989, the NRC issued Supplement 3 to Bulletin 88-08 which provided information concerning a new valve and piping configuration which could result in unacceptable thermal stresses and requested that licensees review their previous response to the Bulletin to determine the effect if any of this new configuration. CP&L has completed its review of the existing plant configuration and has determined that significant design differences exist that either minimize the potential of occurrence or enhance the possibility of detection should a similar scenario be created at SHNPP.

As such, no additional actions are required by NRC Bulletin 88-08, Supplement

3. This information is submitted in response to a verbal request from the NRC staff.

90020S0027 900126

~

PDR ADOCK 05000400 PDC

Document Control Desk NLS-90-015 / Page 2 Please refer any questions regarding this submittal to Mr. John Eads at (919) 546-4165.

Yours very trul A. B. Cutter JHE/jhe A. B. Cutter, having been first duly sworn, did depose and say that the information contained herein is true and correct to the best of his information, knowledge and belief; and the sources of his information are officers, employees, contractors, and agents of Carolina Power & Light Company.

. s.P~

Notary (Seal)

My commission expires:

cc: Mr. R. A. Becker Mr. S. DE Ebneter Mr. J. E. Tedrow