ML17227A407

Part 21 Rept Re crack-like Indications Found in Monel 400 Socket Weld Tee Fittings Supplied by Tioga Pipe & Supply Co.Fabrication Suspended & Metallurgical Exams Conducted. Util Procurement Process Modified

ML17227A407
Person / Time
Site:	Saint Lucie
Issue date:	04/28/1992
From:	Bohlke W FLORIDA POWER & LIGHT CO.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
REF-PT21-92 L-92-119, NUDOCS 9205050292
Download: ML17227A407 (7)

Text

ACCELERATED 'RIBUTION DEMONS TION SYSTEM REGULATORY INFORMATXON DISTRIBUTION SYSTEM (RIDS)

ACCESSION NBR:9205050292 DOC.DATE: 92/04/28 NOTARIZED: NO,>> DOCKET FACIL:50-335 St. Lucie Plant, Unit 1, Florida Power 6 Light Co. 05000335 50-389 St. Lucie Plant, Unit 2, Florida Power & Light Co. 05000389 AUTH. NAME AUTHOR AFFXLIATION BOHLKE,W.H. Florida Power 6 Light Co.

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

SUBJECT:

Submits rept concerning 3 inch Monel 400 socket weld tee fittings. D DISTRIBUTION CODE: IE19D COPIES RECEIVED:LTR ENCL SIZE:

TITLE: Part 21 Rept (50 DKT)

NOTES RECIPIENT COPIES RECIPIENT COPIES A ID CODE/NAME LTTR ENCL ID 'CODE/NAME LTTR ENCL PD2-2 LA 1 0 PD2-2 PD 1 1 D NORRIS,J 1 1 INTERNAL: AEOD/DSP/ROAB NRR/DRIS/RVIB9D 1

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RES/DSIR/EIB 1 1 RGN1 1 1 RGN2 1 1 RGN3 1 1 RGN4 1 1 RGN5 1 1 SECY VANDERMEL 1 1 EXTERNAL: INPO RECORD CTR 1 1 NRC PDR 1 1 NSIC SILVER,E 1 1 D

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D 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 LIPID FOR DOCUMENTS YOU DON'T NEED!

TOTAL NUMBER OF COPIES REQUIRED: LTTR 18 ENCL 17

P.O. Box14000, Juno Beach, FL 33408-0420 APR2 8 )S92 L-92-119 10 CFR 21 Document Control Desk U.S..Nuclear Regulatory Commission Washington, D.C. 20555 Re: St. Lucie Units 1 & 2 Docket Nos. 50-335 & 50-389 10 CFR 21 Re ortin of Defects and Noncom liance In accordance with 10 CFR 21.21 (c)(3)(ii), Florida Power & Light Company (FPL) submits the attached report concerning three (3) inch Monel 400 socket weld tee fittings. The attached represents St.

Lucie Plant's final report on this issue.

Should you need additional information concerning the plant-specific nature of this report, please contact us. The firm (see attached) that supplied the tee fittings to FPL is continuing its root cause evaluation. Any other questions concerning this evaluation should be directed to the firm at the address provided in the attached report.

Ver truly yours, W.H. Bohlke Vice President Nuclear Engineering and Licensing WHB/MSD/vmg Attachment cc: Stewart D. Ebneter, Regional Administrator, USNRC Region Senior Resident Inspector, USNRC, St. Lucie Plant II 92050502'V2 920428 T gPR " *DOCK 05000335 PDR an FPL Group company

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10CFR2 1 - REPORTING OF DEFECTS AND NONCOMPLIANCE II

'ice I'AME AND ADDRESS W. H.

Licensing Florida Bohlke, Power P.O. Box 14000 NAME OF S

OF Light Juno Beach, FL 33408 INDIVIDUALS INFORMING NRC President Company Nuclear (FPL)

FACILITY/ACTIVITY/BASICCOMPONENT Engineering and St. Lucie Units 1 & 2 Docket Nos. 50-335 6 50-389 3" Monel 400 Socket, Weld Tee Fittings, ASME SB564 Heat Code MA, Heat Number 52623 FPL Purchase Order Number 90932-92836 ZIZ NAME OF FIRM SUPPLYING COMPONENT Tioga Pipe Supply Company, Inc.

2450 Wheatsheaf Lane P.O. Box 5997 Philadelphia, PA 19137 ZV NATURE OF DEFECT/SAFETY HAZARD A. DEFECT: Crack-like indications were found in a 3" Monel 400 tee fitting during fabrication of a replacement spool section for Intake Cooling Water (ICW) piping for St. Lucie Unit 1. On January 30, 1992, the FPL Nuclear Division Metallurgical Laboratory concluded that the material of the forged tee did not meet mechanical requirements of the ASME SB564 specification to which the material was certified, nor did it compare to the results reported on the Certified Material Test Report (CMTR) provided by the supplier. Actual test results on the tee indicate that the tensile strength and elongation did not meet ASME Section IZ, Part B material specification SB564 requirements.

TENSILE YIELD ELONGATION

( si) ( si)

ASME SB564 70,000 Min. 25,000 Min. 35< Min.

CMTR 84,000 37,600 43a Tee 44,900 31,500 9w

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The, data suggest to FPL that the forging process may have been conducted improperly. However, Tioga Pipe Supply Company is continuing its root cause evaluation.

B. SAFETY HAZARD: Five (5) of the tees were to be installed, as part of prefabricated spool replacement, in the safety-related Quality Group C ICW Pump Lube Water System. A postulated non-ductile failure of the tees combined with failure of a redundant ICW train, under accident conditions, could have resulted in loss of the ultimate heat sink. As described in VI below, no tees of this heat were installed in either unit.

C. VENDOR FINDINGS: The six (6) tees (heat code MA) returned to the material supplier (Tioga Pipe Supply Company) and the one (1) as-forged solid were subjected to non-destructive testing (NDE) and destructive testing (tension test) with the following results:

Liquid penetrant testing:

a. One (1) specimen contained no relevant indications.

b. Six (6) specimens contained relevant indications.

2 ~ Tensile testing:

a. Three (3) specimens met ASME SB564 (UNS04400) mechanical requirements.

b. Four (4) specimens did not meet ASME SB564 (UNS04400) mechanical requirements.

TENSILE YIELD ELONGATION It

( si) ( si)

ASME SB564 70,000 Min. 25,000 Min. 35. Min.

S N 1 78,841 55,072 *27-4~o S N 2 74,175 38,447 39. 6>o S N 3 72,786 34,669 *33 '~o S N 4 73,226 34,770 36.64 S N 5 *65,932 37,074 *19- 6>o S N 6 *66,192 33,267 *24.04 S N 7 73,367 29,359 47. 2~o

• Does not meet specification requirements VENDOR CONCLUSION: Material in this heat lot has been confirmed by Tioga Pipe Supply Company to be defective.

Tioga Pipe Supply Company will continue its root cause investigation.

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V~ DATE OF DISCOVERY OF DEFECT The defect was discovered on January 30, 1992 when the FPL Nuclear Division Metallurgical Laboratory concluded that the material was not in accordance with the material specification referenced in IV (A) above.

VI. NUMBER AND LOCATION OF COMPONENTS A. No 3" Monel 400 socket weld tees of this heat are installed in safety-related systems at either St. Lucie Units 1 or 2.

B. Seven tees were received on FPL Purchase Order 90932-92836. One tee was used in the fabrication described in IV (A) above. The six additional tees of this heat were returned to the material supplier.

VII. CORRECTIVE ACTION A. Fabrication was suspended and metallurgical examinations were conducted. Six additional tees of the same heat were returned by FPL to the materjal supplier.

Corrective action is complete.

B. A review of installed Monel fittings was performed by Engineering and Maintenance. FPL Welding, NDE and testing programs require completed welds to receive a liquid penetrant inspection after completion and leak testing prior to service. The installed Monel fittings meet these criteria. Therefore these installations are acceptable.

C. 1" and greater Monel fittings in St. Lucie Plant stores were placed on hold pending satisfactory external PT examination prior to use.

D. The material supplier (Tioga Pipe Supply Company) has completed testing of the 6 returned tee's (heat code MA) and 1 as-forged solid. Material in this heat lot has been confirmed by Tioga Pipe Supply Company to be defective. The material supplier is continuing his root cause analysis to determine required.

if any further actions are E. Until the root cause investigation and preventative action have been completed by the material supplier, the FPL procurement process has been modified to specify that 1" and greater Monel fittings will receive an external PT examination by the supplier prior to shipment.

VIII'THER INFORMATION FPL reported this information on the INPO NUCLEAR NETWORK on April 1, 1992.