ML20133G609
| ML20133G609 | |
| Person / Time | |
|---|---|
| Site: | Brunswick  |
| Issue date: | 10/10/1985 |
| From: | Zimmerman S CAROLINA POWER & LIGHT CO. |
| To: | Vassallo D Office of Nuclear Reactor Regulation |
| References | |
| NLS-85-360, NUDOCS 8510160050 | |
| Download: ML20133G609 (6) | |
Text
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C9&L Carolina Power & Light Company SERIAL: NLS-85-360 OCT 101985 i
4 i
Director of Nuclear Reactor Regulation l
Attention:
Mr. D. B. Vassallo, Chief Operating Reactors Branch No. 2 3
Division of Licensing United States Nuclear Regulatory Comnussion Washington, DC 20555 BRUNSWICK STEAM ELECTRIC PLANT, UNIT NO. I DOCKET NO. 50-325/ LICENSE NO. OPR-71 ICSCC INSPECTION RESULTS
Dear Mr. Vassallo:
)
On October I,1985, a confc c. ice call was held with members of your staf f regarding the results of Intergranular Stress Corrosion Cracking (IGSCC) inspections performed for Brunswick-l during the current Reload 4 outage. Enclosure i contains a summary of your staff's requests along with our responses.
Please refer any further questions regarding this matter to Mr. Stephen D. Floyd at (919) 336-6901.
i Yours very truly, i
S.
. Zimn erman Ma
,er Nuclecr icensing Section MAT /crs (2003 MAT) l Enclosure cc:
Mr. W. H. Ruland (NRC-BNP) j Dr. J. Nelson Grace (NRC-RII) j Mr. M. Grotenhuis (NRC) i 1
8510160050 951010 PDH ADOCK 05000325 N
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ho et rey.n.<,n. so..t. p o no, issi. n.i.,e n c 2nor 1
O ENCLOSURE 1 Question i Please provide the axial stress components for the two 23-inch weld overlays.
Response
The axial stress components for welds 23-A4 and 28-B4 are as follows (psi):
Weld No.
Pressure + Deadweight Thermal Shrinkage Seismic 28-A4 7143 2749 195 648 23-B4 6975 1696 191 517 Question 2 What is the ferrite content of the repaired welds?
l
Response
There were 12 independent measurements performed on the first acceptable layer of each weld-o-let repair; each measurement resulted in a ferrite number in excess of 7.5. The materials list verified that the weld filler metal used for the repairs had a ferrite number of 9.
Question 3 Your August 16,1985 submittal stated that the remaining susceptible weld population at Brunswick-1 consists of 110 welds. Please provide a summary of the mitigative actions taken on these welds.
j
Response
The following mitigative actions have been performed on the remaining susceptible weld population at Brunswick-1.
Weld Overlayed 10 e
1 Solution Annealed 11 l
$7 Non-mitigated 10 Total 110 Of the 10 unmitigated welds,7 are 4-inch weld-o-let joints,1 is a 6-inch weld-o-let joint, and 2 are 4-inch RWCU return line welds located outside containment.
(2005 MAT /crs)
4" Weld-O-Let Joints 6" Weld-O-Let Joint 4" RWCU Welds 4" B32 A-1 20" Eli A-1BC 4" G 31 2 4" B32 B-1 4" G31 3 4" B32 B-10 28" B32 A-12BC 23" B32 A-15BC 23" B32 B-12BC 23" B32 B-15BC Question 4 What is the UT measured pipe wall thicknesses of the repaired welds?
Response
Table I provides the requested thicknesses.
Question 5 What are the as-built overlay thicknesses, exclusive of the first layer?
Response
Table 2 provides the requested thicknesses.
Question 6 What is the required overlay thickness to repair 100 percent through-wall,360*
circumferential flaws (Reference page 22 of the NUTECH report).
Response
Weld Number Req. Thickness (inches)
'l 1 -B 32-12"- A R-A 3
.250 1 -B 32-12"- AR-C 2
.260 1 -B 3 2-12"- A R-D 4
.230 1 -B 32-12"-B R-G 2
.220 1 -B 32-12"-B R-33
.230 (2003 MAT /crs)
TABLE 1 UT MEASURED PIPE WALL THICKNESS (INCHES)
LOCATION
- Weld Number A_
B C_
D_
E l-B32-12"-AR-A2
.632
.632
.657
.746
.790 1 -B 32-12"-AR-A 3
.78
.75
.79
.63
.64 1-B32-12"-AR-B3
.75
.73
.705
.63
.64 1-B32-12"- A R-C 2
.630
.645
.690
.763
.775 1-B32-12"-AR-C3
.76
.72
.74
.64
.64 1 -B 32-12"-A R-D2 NR
.65
.67
.77 NR l-B32-12"-AR-D3
.75
.68
.71
.71
.68 1 -B 32-12"-AR-D4
.63
.66
.73
.70
.71 1 -B 32-12"- AR-E 3
.30
.74
.37
.69
.65 l
1 -B 32-12"-B R-F 2 NR
.655
.67
.785 NR l -B 32-12"-BR-G 2 NR
.65
.65
.76 NR l -B 32-12"-B R-G 3 NR
.72
.63
.63 NR i
1 -B 32-12"-B R-G 4
.63
.63
.76
.74
.73 l-B 32-12"-B R-H 2
.65
.67
.69
.745
.78 1 -B 32-12"-B R-H 3
.79
.70
.65
.63
.68 1 -B 32-12"-B R-32
.65
.67
.70
.77
.78 1-B 32-12"-B R-33
.70
.65
.67
.62
.62 1 -B 32-12"-B R-K 2
.639
.658
.641
.777
.772 1-B32-12"-BR-K3
.78
.75
.69
.64
.63 1 -B 32-12"-B R-K 4
.64
.74
.S2
.78
.78 1-B 32-28"- A 4 1.35 1.32 l.28 1.18 1.22 1 -B 32-28"-B4 1.45 1.35 1.20 1.20 1.20 1 -B 32-2S"- AS NOTE: Only one reading taken -- 1.30 NR -- Thickness not recorded.
- For Locations See Figure l i
(2003 MAT /crs) l
TABLE 2 AS-BUILT OVERLAY THICKNESS (INCHES)
Effective Weld Number Thickness Notes 1-B32-12"-AR-A2
.220 1-B32-12"- AR-A 3
.340 1 -B 32-12"- A R-B 3
.280 1-B32-12"-AR-C2
.330 l-B32-12"-AR-C 3
.260 1 -B32-12"-AR-D 2
.210 1-B32-12"-AR-D3
.230 1 -B 32-12"- A R-D4
.320 1-B 32-12"- A R-E 3
.290 1 -B 32-12"-B R-F 2
.230 1 -B 32-12"-B R-G 2
.310 1-B 32-12"-B R-G 3
.270 1 -B 32-12"-B R-G4
.07 Intermediate vs. first layer 1-B32-12"-BR-H2
.210 1-B 32-12"-B R-H 3
.340 1 -B 32-12"-B R-32
.180 1 -B32-12"-B R-J 3
.340 1-B32-12"-BR-K2
.340 1 -B 32-12"-B R-K 3
.230 1-B32-12"-BR-K4
.120 1-B 32-28"- A4
.04 Intermediate vs. first layer 1 -B 32-28"-B4
.03 Intermediate vs. first layer NOTES:
For those weld numbers designated " intermediate vs. first layer", this means that a layer thickness measurement was not taken for the first layer.
Instead, the rneasurement was made at an intermediate layer. Thus, when the pipe wall thickness plus the initial layer (s) thickness (for which we do not take credit for) are subtracted from the as-built thickness measurements, the low effective thickness values result. These overlays are for axial indications and only required in order to provide a leak barrier.
(2003 MAT /crs)
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