ML20080P411
| ML20080P411 | |
| Person / Time | |
|---|---|
| Site: | Brunswick  |
| Issue date: | 02/10/1984 |
| From: | Howe P CAROLINA POWER & LIGHT CO. |
| To: | Vassallo D Office of Nuclear Reactor Regulation |
| Shared Package | |
| ML20080P415 | List: |
| References | |
| NLS-84-055, NLS-84-55, NUDOCS 8402220537 | |
| Download: ML20080P411 (7) | |
Text
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b SERIAL: NLS-84-055 Carolina Power & Light Company FEB 101984
-Director of Nuclear Reactor Regulation At tention:
Mr. D. B. Vassallo, Chief Operating Reactors Branch No. 2 Division of Licensing United States Nuclear Regulatory Commission Washington, DC 20555 BRUNSWICK STEAM ELECTRIC PLANT, UNIT No. 2 DOCKET NO. 50-324 LICENSE NO. DPR-62 UNIT 2 IGSCC INSPECTIONS j
Dear Mr. Vassallo:
In a letter dated November 28, 1983, Carolina Power & Light Company (CP&L) committed to submit the final design report on the fracture mechanics evaluations and weld overlay repairs performed at Brunswick Steam Electric Plant, Unit No. 2 (BSEP2).
In addition, your staff has requested a listing of significant geometry indications and their disposition.
Enclosed is the final design report prepared for CP&L by NUTECH Engineers.
This report contains details of the f racture mechanics analyses, weld overlay designs and evaluations of shrinkage stresses due to weld overlays.
In addition to the NUTECH report, At tachment I lists the significant geometry indications and their disposition.
4 The Commission issued an o-der for BSEP, Unit 2 concerning IGSCC inspection.
Paragraph III.2.c states the following:
Plans for inspections, corrective actions, and/or modification, including replacement of the recirculation and/or coolant pressure boundary piping systems, during the next outage which is scheduled to begin in March 1984 but which may begin as late as April 30, 1984 shall be submitted at'least 30 days before the startup of that outage.
In compliance with the above paragraph, during the refueling outage scheduled
- for March 1984,. CP&L plans to re-inspect the weld joints that contained IGSCC indications and were not repaired during the November 1983 inspection.
Ba sed on the results of those inspections, the joints will be either repaired or an analysis will be done to justify continued operation without repair.
Be cause of the short period of' operation between the inspection outage performed in November 1983 and the refueling outage scheduled for March 1984 (4 months), we do not plan to re-inspect the weld joints that did not have IGSCC indications or those weld joints that were repaired.
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8402220537 840210 PDR ADOCK 05000324 G
PDR qL ii 411 Fayetteville Street
- P. O. Box 1551
- Raleigh N. C. 27602 f
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Should you have any questions-concerning this letter, please do not hesitate to contact a member of our Licensing Staff.
Yours very truly, P. W. Howe Vice President Brunswick Nuclear Project
- PPC/ccc (9438PPC) cc:
Mr. D. O. Myers (NRC-BSEP)
Mr. J. P. O'Reilly (NRC-RII)
Mr. M. Crotenhuis (NRC).
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F ATTACHMENT 1 SIGNIFICANT GEOMETRY INDICATIONS MAXIMUM WELD NUMBER CONFIGURATION AMPLITUDE DISPOSITION 2B 3 2-12"-AR-D4 S E-P 35%
Re-examined with 60* and determined to be root geometry.
This was confirmed with RT.
2B32-12"-AR-E3 P-E 90%
Based upon transducer position and metal path of indication the signal was determined to be root geometry. Indication was seen for the entire circumference of the weld and confirmed with RT.
2B32-12"-BR-G2 P-E 63%
Re-examined with 60* and determined to be ID geometry from the outer portion of counterbore. Verified with PSI data.
2B32-12"-BR-F2 P-E 65%
Based on transducer position and metal path of the indication, the signal was determined to be ID geometry f rom the outer portion of counterbore.
Indication was seen 360* and verified with PSI data.
2B32-12"-AR-A2 P-E 90%
Based on transducer position and metal path of the indication, signal was determined to be ID geometry from the outer portion of the counterbore.
Indication was seen 360* and verified with PSI data.
2B32-28"-A15 E-P 80%
Based on transducer position and metal path of the indication, the signal was determined to be ID geometry f rom the weld root. The same signal was seen from both sides of the weld for 360*.
70%
Based on transducer position and metal path of the indication, signal was determined to be ID geometry from the outer counterbore.
(1)
M AXIMUM WELD NUMBER CONFIGURATION AMPLITUDE DISPOSITION 2B3 2-2 8"-B8 E-V 60%
Based on transducer position and metal path of the indication, signal was determined to be ID geometry from the outer counterbore.
Indication was seen 360*.
2B32-28"-B14 V-E 100%
Same as 2B32-28"-B8.
2B 3 2-12"-AR-D 2 P-E 90%
Based on transducer position and metal path of the indication signal was det. ermined to be ID geometry from inner counterbore.
Signal was seen 360* with mode conversion to the weld crown.
Indication correlated with PSI data.
2B32-12"-AR-E2 P-E 65%
Based on transducer position and metal path of the indication, the signal was determined to be ID geomet ry f rom the counterbore.
The signal damped on the weld crown and was seen 360*.
The signal correlated with the PSI data.
2B32-28"-A3 P-E 70%
Based on transducer position and metal path of the indication, the signal was determined to be ID geometry f rom the counterbore.
The signal was seen 360* and accompanied by mode conversion.
2 B32-12"-BR-II2 P-E 45%
Based on transducer position and metal path of the indication, the signal was determined to be ID geometry f rom the counterbore.
Indication was seen 360*.
2B32-12"-AR-B1 BC-P 60%
Based on tra cducer position and metal path of the indication, the signal was determined to be ID geometry f rom the counterbore.
Indication was seen 360*.
2B32-12"-BR-il3 P-E 40%
Based on transducer position and metal path of the indication, the signal was determined to be ID geometry f rom the counterbore.
Indication was seen 360* and correlated with PSI data.
(2)
p MAXIMUM WELD NUMBER CONFIGURATION AMPLITUDE DISPOSITION 2B 3 2-12"-B R-G 3 P-E Same as 2B3 2-12"-BR-H3.
2B32-28"-A17 T-Cr 50%
Based on transducer position and metal path of the indication, the signal appeared to be internal mode conversion in the weld.
Signal was seen 360*.
2B32-28"-A18 Cr-R 50%
Same as 2B32-28"-A17.
2B3 2-28"-B17 T-Cr 25%
Same as 2B3 2-28"-A17.
2B32-28"-B18 R-Cr 25%
Same as 2B32-28"-A17.
2B3 2-12"-A R.-B3 E-P 80%
Based on transducer position and metal path of the indication, signal was determined to be ID geometry from the outer counterbore.
Signal was seen 360* with mode conversion to the weld crown.
Indication correlated with PSI data.
Based on transducer position and metal path of the indication, signal was determined to be weld /
base metal interface.
60%
Based on transducer position and metal path of the indication the signal was determined to be ID geometry f rom the counterbore.
2B32-12"-BR-F3 P-E 25%
Based on transducer position and metal path of the indication, signal was determined to be ID geometry from the counterbore.
2B32-12"-AR-B2 P-E 45%
Based on transducer position and metal path of the indication, signal was determined to be ID geometry from the outer t
counterbore. The signal was seen l
360* and correlates to PSI data.
2B32-12"-AR-D3 P-E 55%
Based on transducer position and metal path of the indication, the signal was determined to be ID l
geometry outer counterbore.
Signal was seen 360* with mode conversion to the weld crown.
(3)
z MAXIMUN WELD NUMBER CONFIGURATION AMP.LITUDE DISPOSITION 2B3 2-28"-A9 V-P 50%
Based on transducer position and metal path of the indication, signal appeared to be root geometry. This was confirmed with a 60* examination.
2832-28"A11 E-Pump 130%
Based on transducer position and metal path of the indication, the signal was determined to be ID geometry signal was determined to be ID geometry from the inner counterbore.
The signal was seen 360* and correlated to PSI data.
2B32-28"-A12 Pump-P 50%
Based on transducer position and metal psth of the indication, the signal was determined to be ID geometry f rom the weld root. The signal was seen 360* and confirmed with RT.
2B32-28"-A10 P-E 50%
Based on transducer position and metal path of the indication, the signal was determined to be ID geometry from the weld root. The signal was seen 360' and damped on the OD surface.
This was confirmed with a 60* examation.
2832-38"-87 P-E 50%
Based-on transducer position and metal path of the indication, the signal was determined to be ID geometry from the counterbore area. The signal was seen 360'.
2B32-28"-89BC P-Sad 50%
Based on transducer position and metal path of the indication, the signal was determined to be ID geomctry from the weld root. The signal was seen 360'.
2832-28"-B11
'E-Pu 60%
Same as 2B32-28"-B9BC 2B 3 2-28"-A7 P-E 30%
Based on transducer position and metal path of the indication, the signal was determined to be ID geometry from weld root. Signal was seen 360* and confirmed with 60' examination.
2B32-22"-AM-6 P-Cp 80%
Indication was seen intermittently 360* and
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determined to be ID geometry.
(4)
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MAXIMUM WELD NUMBER CONFIGURATION AMPLITUDE DISPOSITION 233 2-2 2"-AM-1 P-V 100%
Indication was seen 180* and determined to be ID geometry.
2B32-22"-BM-2 P-Cr 95%
Indication was seen intermittently 360* and determined to be ID geometry.
2B32-22"-AM-2 P-V 100%
Indication was seen intermittently for 180* and was determined to be 13 geometry.
ABBREVIATIONS BC:
Branch Connection Cp:
Ca p Cr:
Cross E:
Elbow P:
Pipe Pu:
Pump R:
Reducer RT:
Ra diograph Sad: Saddle SE:
Sa f e End T:
Tee V:
Valve DISPOSITION SUDfARY Indications were plotted using ultrasonic thickness measurements and weld preparation drawings. The scope watchers were EPRI qualified Level II examiners who have been trained to distinguish geometric versus IGSCC Indications were evaluated by an EPRI qualified Level III and indications.
data was reviewed by a CP&L Level III.
The ability to distinguish geometry from IGSCC indications was demonstrated during the examinations of welds In these 2B3 2-12"-A14, 2B3 2-12"-BR-J 3, 2B3 2-12"-BR-J 2, and 2B3 2-12"-B R-K2.
welds IGSCC was detected adjacent to areas where significant geometric indications were recorded.
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(5)