L-92-119, 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,>>
FACIL:50-335 St. Lucie Plant, Unit 1, Florida Power 6 Light Co.
50-389 St. Lucie Plant, Unit 2, Florida Power
& Light Co.
AUTH.NAME AUTHOR AFFXLIATION BOHLKE,W.H.
Florida Power 6 Light Co.
RECIP.NAME RECIPIENT AFFILIATION Document Control Branch (Document Control Desk)
SUBJECT:
Submits rept concerning 3 inch Monel 400 socket weld tee fittings.
DISTRIBUTION CODE:
IE19D COPIES RECEIVED:LTR ENCL SIZE:
TITLE: Part 21 Rept (50 DKT)
NOTES DOCKET 05000335 05000389 R
D RECIPIENT ID CODE/NAME PD2-2 LA NORRIS,J INTERNAL: AEOD/DSP/ROAB NRR/DRIS/RVIB9D RES/DSIR/EIB RGN2 RGN4 SECY VANDERMEL EXTERNAL: INPO RECORD CTR NSIC SILVER,E COPIES LTTR ENCL 1
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D NOTE TO ALL"RIDS" RECIPIENTS:
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D 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:
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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 II Senior Resident Inspector, USNRC, St. Lucie Plant 92050502'V2 920428 T
gPR
" *DOCK 05000335 PDR an FPL Group company
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10CFR2 1 - REPORTING OF DEFECTS AND NONCOMPLIANCE I'AME AND ADDRESS OF INDIVIDUALS INFORMING NRC II'ice President Nuclear Engineering and W.
H.
P.O.
Box 14000 Juno
- Beach, FL 33408 NAME OF FACILITY/ACTIVITY/BASICCOMPONENT 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.
( si) 70,000 Min.
84,000 44,900 YIELD
( si) 25,000 Min.
37,600 31,500 ELONGATION 35< Min.
43a 9w
C
'I
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.
Liquid penetrant testing:
a.
One (1) specimen contained no relevant indications.
Six (6) specimens contained relevant indications.
b.
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:
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 It
( si)
YIELD
( si)
ELONGATION ASME SB564 70,000 Min.
25,000 Min.
- 35. Min.
S N 1 S
N 2 S
N 3
S N 4 S
N 5 S
N 6 S
N 7 78,841 74,175 72,786 73,226
- 65,932
- 66,192 73,367 55,072 38,447 34,669 34,770 37,074 33,267 29,359
- 27-4~o
- 39. 6>o
- 33 '~o 36.64
- 19-6>o
- 24.04
- 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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DATE OF DISCOVERY OF DEFECT VI.
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.
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 if any further actions are required.
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.