ML17348A287

Responds to NRC Bulletin 89-002, Stress Corrosion Cracking of High Hardness Type 410 Stainless Steel Internal Preloaded Bolting in Anchor/Darling Model S350W Swing Check Valves or Valves of Similar Design. Bolt Replacement Performed

ML17348A287
Person / Time
Site:	Turkey Point
Issue date:	06/08/1990
From:	Goldberg J FLORIDA POWER & LIGHT CO.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
IEB-89-002, IEB-89-2, L-90-195, NUDOCS 9006130399
Download: ML17348A287 (5)

Text

ACCELERATED DQTIUBUTION DEMONSTION SYSTEM REGULATORY INFORMATION DISTRIBUTION SYSTEM (RIDS)

ACCESSION NBR:9006130399 DOC.DATE: 90/06/08 NOTARIZED: YES DOCKET 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 GOLDBERG,J.H. Florida Power 6 Light; Co.

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

SUBJECT:

Responds to NRC Bulletin 89-002, "Stress Corrosion Cracking of High Hardness Type 410...."

DISTRIBUTION CODE: IE32D COPIES RECEIVED:LTR ENCL SIZE:

TITLE: Bulletin Response 89-02 re Cracking of Hzgh-Hardness Type 4 0 Bolting NOTES'ECIPIENT COPIES RECIPIENT COPIES 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/TPAB 1 1 NRR/DET/ECMB9H 2 2 NRR/DET/EMEB9H3 1 1 NRR/DOEA/OEAB11 1 1 NRR/DOEA/OGCB11 1 1 NRR/DREP/PEPB9 D 1 1 NRR/DST 8E2 1 1 NRR/EMCB/HERMAN 1 1 NRR/MCLELLAN T g 1 1 NRR/PMAS/ILRB12 1 1 NRR ROO H 1 1 NRR/SELLERS, D. 1 1 E 0 1 1 RES/DSIR/EIB 1 1 E 01 1 1 EXTERNAL: LPDR 1 1 NRC PDR 1 1 NSIC 1 1 NOTE TO ALL "RIDS" RECIPIENTS:

PLEASE HELP US TO REDUCE WASTE! CONTACT THE DOCUMENT CONTROL DESK, ROOM P 1-37 (EXT. 20079) TO ELIMINATEYOUR NAME FROM DISTRIBUTION LISTS FOR DOCUMENTS YOU DON'T NEED!

TOTAL NUMBER OF COPIES REQUIRED: LTTR 23 ENCL 22

1 P,O. Box 14000, Juno Beach, Fl 33408 0420 JUiHB 0 8 1990 L-90-195 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 No. 89-02 Stress Corrosion Cracking of High Hardness Type 410 Stainless Steel Internal Preloaded Bolting in Anchor Darling Model S350W Swing Check Valves or Valves of Similar Desi n NRC Bulletin 89-02, issued by the NRC on July 19, 1989, requested that licensees identify, disassemble and inspect certain types of swing check valves which may contain Type 410 Stainless Steel (SS) bolting material. If the Type 410 SS bolting material is of sufficiently high hardness that it is susceptible to stress corrosion cracking, or has failed, "licensees were requested to take appropriate actions.

Florida Power and Light Company (FPL) identified the following valves within the scope of NRC Bulletin 89-02: eleven Anchor Darling check valves (per unit) located in the Safety Injection System (SIS), four Velan check valves (per unit) located in the Chemical and Volume Control System, and four Velan check valves (common to both units) located in the SIS.

The current status of these valves is as follows:

o Bolt replacement has been performed in all Unit 4 Anchor Darling check valves.

o Bolt replacement has been performed for four of the eleven Unit 3 Anchor Darling check valves.

o Bolt replacement has been performed for all Velan swing check valves.

Please see attachment for additional details.

9ppb J,3(.i399 9pp6p.~

PDR nDOCK r~vppp2zp Q PDC an fPL Group company

U. S. Nuclear Regulatory Commission L-90-195 Page two FPL is deferring 'action on the remaining seven Unit 3 valves to the Cycle 13 (four valves) and Cycle 14 (three valves) refueling outages, currently scheduled to begin August 1992 and April 1994 respectively, to coincide with inspections already planned and for ALARA concerns. Inspections in all eleven Unit 4 valves and four Unit 3 valves found no cracked, broken, or otherwise degraded bolt material. Magnetic particle testing, Rockwell hardness testing and visual inspections were performed on all 410 SS studs removed from the 15 Anchor Darling check valves. The results of these tests and inspections showed no visual indications of stress corrosion cracking, and showed Rockwell hardness values well below the NRC acceptance criteria. No test data is available for the Velan valves. Westinghouse performed an evaluation of Anchor Darling check valve stud cracking due to stress corrosion. The Westinghouse evaluation of the valve internal structure indicates that even with both bolts broken, the valve would function .as designed. Review of the small break LOCA analysis indicates significant margin to the applicable limits, even with the loss of an ECCS flow path.

Based on the above, FPL believes Turkey Point Unit 3. will operate reliably through the next two fuel cycles, by which time FPL will have replaced all of the bolts with new material.

If you should have any questions, please contact us.

Yours truly, J. H. Goldberg Executive Vice President attachment cc: Stewart D. Ebneter, Regional Administrator, USNRC, Region II Senior Resident Inspector, USNRC, Turkey Point Plant

STATE OF FLORIDA )

) ss.

COUNTY OF PALM BEACH )

J. H. Goldber being first duly sworn, deposes and says:

That he is Executive Vice President, of Florida Power and 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.

J. H. Gold rg Subscribed and sworn to before me this day of NOT~Y PUBLIC, in and fo e County of Palm Beach, State of Flor da Notary Public, State of Rorida 1, 1993 My Cornrnission Expires June o~>>ssion expires ~ngoarhtu rtoy rain ~ rn>utonct rnc.

Turkey Point Units 3 and 4 Docket Nos. 50-250 and 50-251 NRC Bulletin No. 89-02 ATTACHMENT STATUS OF CHECK VALVES WITHIN SCOPE OF NRC BULLETIN 89-02 Component Swing Check Valve Bolt Ta Number ~Ss Size and Make Re lacement 3-875A SI Anchor Darling 10" Complete 3-875B SI Anchor Darling 10" Incomplete 3-875C SI Anchor Darling 10" Incomplete 3-875D SI Anchor Darling 10" Complete 3-875E SI" Anchor Darling 10" Incomplete 3-875F SI Anchor Darling 10" Incomplete 3-876A SI Anchor Darling 8" Incomplete 3-876B SI Anchor Darling 8>> Complete 3-876C SI Anchor Darling 8" Incomplete 3-876D SI Anchor Darling 8" Complete 3-876E SI Anchor Darling 8" Incomplete 4-875A SI Anchor Darling 10" Complete 4-875B SI Anchor Darling 10" Complete 4-875C SI Anchor Darling 10" Complete 4-875D SI Anchor Darling 10" Complete 4-875E SI Anchor Darling 10" Complete 4-875F SI Anchor Darling 10" Complete 4-876A SI Anchor Darling 8" Complete 4-876B SI Anchor Darling 8" Complete 4-876C SI Anchor Darling 8" Complete 4-876D SI Anchor Darling 8" Complete 4-876E SI Anchor Darling 8" Complete 3-312A CVCS Velan 3" Complete 3-312B CVCS Velan 3" Complete 3-312C CVCS Velan 3" Complete 4-312A CVCS Velan 3" Complete 4-312B CVCS Velan 3" Complete 4-312C CVCS Velan 3" Complete 3-266 CVCS Velan 4" Complete 4-266 CVCS Velan 4" Complete 879A SI Velan 3" Complete 879B SI Velan 3" Complete 879C SI Velan 3" Complete 879D SI Velan 3" Complete