ML17347A861

Responds to NRC Bulletin 88-008, Thermal Stresses in Piping Connected to Rcs. Supplemental Rept Providing Details & Implementation Schedule of Actions Required Under Item 3 of Bulletin Will Be Provided by 881230

ML17347A861
Person / Time
Site:	Turkey Point
Issue date:	10/14/1988
From:	Conway W FLORIDA POWER & LIGHT CO.
To:	NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM)
References
IEB-88-008, IEB-88-8, L-88-436, NUDOCS 8810180387
Download: ML17347A861 (6)

Text

gCCEMRATZD DI~GBUTION DEMONSTRATION SYSTEM REGULATORY INFORMATION DISTRIBUTION SYSTEM (RIDS)

ACCESS/ON NBR: 8810180387 DOC. DATE: 88/10/14 NOTARIZED: YES DOCKET.O FACIL:50-250 Turkey Point Plant, Unit 3, Florida Power and Light C 05000250 50-251 Turkey Point Plant, Unit 4, Florida Power and Light C 05000251 ~

AUTH. NAME AUTHOR AFFILIATION CONWAY,W.F. Florida Power & Light Co.

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

SUBJECT:

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

DISTRIBUTION CODE: IE16D COPIES RECEIVED:LTR ( ENCL / SIZE:

TITLE: Bulletin Response 88-08 Thermal Stress in Piping to RCS.

NOTES:

RECIPIENT COPIES RECIPIENT "

'OPIES ID CODE/NAME LTTR ENCL ID CODE/NAME LTTR ENCL PD2-2 LA 1 0 PD2-2 PD 1 1 EDISON,G 1 1 INTERNAL: AEOD/DOA 1 1 AEOD/DSP 1 1 AEOD/DSP/TPAB 1 1 NRR HARTZMAN,M 1 1 NRR HUM,M 1 1 NRR REEVES,E.A. 1 1 NRR RIVENBARK,G 1 1 NRR/DEST/ADE 8H 1 1 NRR/DEST/ADS 7E 1 1 NRR/DEST/MEB 9H 1 1 NRR/DOEA/EAB 11 1 1 NRR/DOEA/GCB 11 1 1 NRR/DREP/EPB 10 1 1 N PMAS LRB12 1 1 NUDOCS-ABSTRACT 1 1 EG 02 1 1 RES/DSIR/EIB 1 1 RGN2 FILE 01 1 1' EXTERNAL: LPDR 1 1 NRC PDR 1 NSIC 1 1 D

NVK K) ALL 'KIDS" R1KIPIBGS:

S PLEASE HELP US TO REDUCE %ASTE! (EgI'ACI'HE DOCUMEPZ CONIBDL DESK ROON P1-37 (EXT. 20079) KO EIZKQQZE %SR NAME KKH DISTEGBUTIGN LISTS HZt IXXXlMERIS YOU DGN~T NEEDf TOTAL NUMBER OF COPIES REQUIRED: LTTR 24 ENCL 23

lI BOX 14000, Jub'0 tSBAC~, ~. 33408 0420 OCTQBER 1 q 1988 L-88-436 U. S. Nuclear Regulatory Commission Attn: Document Control Desk Washington, D. C. 20555 Gentlemen:

Re: Turkey Point Units 3 and 4 Docket Nos. 50-250 and 50-251 NRC Bulletin 88-08 Thermal Stresses in Pi in Connected to Reactor Coolant S stems By the subject Bulletin, the NRC staff requested Licensees to 1) review their reactor coolant systems to identify any connected, unisolable piping that could be subjected to temperature distributions which would result in unacceptable thermal stress, 2) conduct nondestructive testing of the identified piping, that the piping will not be and')

take action to provide continuing assurance subjected to unacceptable thermal stresses.

Attached is a response to items 1 6 2 and a schedule for response to item 3.

A supplemental report providing the details and implementation schedule of the actions required under item 3 will be provided December 30, 1988.

Florida Power & Light Company requested a two week extension for the submittal

'of. this response. This request was granted by a member of your Region II Staff.

Very truly yours, W. F. C ay Senior i .e President - Nuclear WFC/SDF/gp Attachment cc: Malcolm L. Ernst, Acting Regional Administrator, Region II, USNRC Senior Resident Inspector, USNRC, Turkey Point Plant 8810180887 881014 PDR ADOCK 05000250 9 PDC an FPL Group company

STATE OF FLORIDA )

) ss.

COUNTY OF PALM BEACH )

D. A. Sa er being first duly sworn, deposes and says:

That he is Actin Vice President Nuclear Ener of Florida Power 6 Light Company, the Licensee herein; That he has executed the foregoing document; that the statements made in this document are true and correct to the best of his knowledge, information, and belief, and that he is authorized to execute the document on behalf of said Licensee.

D. . Sager Subscribed and sworn to before me this

~8 day of NOTARY PUBLIC, in and for County of Palm BEach, State of Florida Rotary Public, State of Rorirfa My Commission Expires June 1, 1989 My Commission expires: dondod Tdco Tcoy Fain ~ Incocnnco, tnc.

ATTACHMENT ACTION 1 Review systems connected to the RCS to determine whether unisolable sections of piping connected to the RCS can be subjected to stresses from temperature stratification or temperature oscillations that could be induced by leaking valves and that were not evaluated in the design basis.

RESPONSE

FPL reviewed the system piping which was connected to or a part of the Reactor Coolant System (RCS) that could be susceptible to stresses from temperature stratifications or temperature oscillations induced from leaking valves. The following six flowpaths were examined in further detail:

Charging pumps to the pressurizer auxiliary spray Charging pumps to C Hot Leg Safety Injection pumps to the RCS

- Accumulators to the RCS

- Charging pumps to Loop A Cold Leg

- Residual Heat Removal pumps to the RCS The flowpaths from the charging pumps to the pressurizer auxiliary spray and the charging pumps to C Hot Leg were identified as being potentially susceptible to the concerns raised in this bulletin.

ACTION 2 For any unisolable sections of piping connected to the RCS that may have been subjected to excessive thermal stresses, examine nondestructively the welds, heat:-affected zones and high stress locations, including geometric discontinuities, in the piping to provide assurance that there are no existing flaws.

RESPONSE

For the two potentially susceptible flowpaths identified in Action 1 the piping locations most susceptible to fatigue and the points of maximum potential Delta T were identified for nondestructive evaluation. The components of maximum anticipated fatigue loading in these flowpaths were also identified for base metal evaluation. These inspections will be performed during the current Unit 4 refueling outage and upcoming 1989 Unit 3 refueling outage. The results of these inspections will be provided in supplemental reports issued 30 days fiom restart following these outages.

ACTION 3 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 and other stresses that could cause fatigue failure during the remaining life of the unit.

RESPONSE

The methods available to provide continuing assurance that unisolable sections of piping will not be subject to combined cyclic and static thermal and other stresses that could cause fatigue failure are currently under review. The development of the plan and the schedule for its implementation will be completed by December 2, 1988. A supplemental report explaining the plan and the schedule for its implementation will be issued by December 30, 1988.