ML033580372
| ML033580372 | |
| Person / Time | |
|---|---|
| Site: | Braidwood  |
| Issue date: | 11/20/2003 |
| From: | Mahesh Chawla NRC/NRR/DLPM/LPD3 |
| To: | |
| Chawla M, 415-8371, NRR/DLPM | |
| Shared Package | |
| ML033580377 | List: |
| References | |
| TAC MC1367 | |
| Download: ML033580372 (4) | |
Text
Braidwood Unit 2 Refuel 10 Fall 2003 Steam Generator Inspection Results Summary November 20, 2003 1
Braidwood I Seabrook Indication Comparison Item Braidwood 2 1
Seabrook Notes Tubing Material Alloy 6001T Alloy 6001T
~u~ing~~Size 0750 OD X0.043 t 0.688 OD x 0.040 t Tubing Manufacturer W-Blairsville W-Blairsville Same process, except dimensions Date of Tubing Manufacture February-April 1980 Apnl-July 1980 Contiguous manufacturing schedules Operating Temperature 610.4°F 616.5°F First Incidence of ODSCC 12.68 EFPY 9.71 EFPY First reported incidence Indication Parameters R21C50-03H R5C62-04H All parameters apply for a single indication Max Bobbin Volts 0.34 0.91 Max +Point Volts 0.41 1.24 Max Length 0.73 in.
0.73 in.
Max Depth from NDE 47% (Volt Based) 66% (Volt Based)
Destructi~eexam showed max depth 99 5%
PDA 335 386 Pressure Prediction (137.37 ksi) 7830 psi 6948 psi Tested to 6480 psi w/o burst (137.37 ksi)
- 1) Lengths are based on zero depth beginning to zero depth ending.
- 2) Seabrook pressures were scaled from an Sy+Su of 148.4 ksi at 650°Fto the 137.37 ksi value used for Braidwood 2.
The latter being the average in the Westinghouse database.
2
Feedwater Area where backing bars found Preheater Region 3
Refuel 10 Final Results SG A (8 Tubes Plugged) 1 ODSCC at TSP
2 Preventative No Degradation (Low Row Screened as High Residual Stress) 2 AVB Wear
3 Plugged and Stabilized due to secondary side foreign object (Bushing)
SG B (39 Tubes Plugged)
13 Plugged and Stabilized due to failed fit-up bars on secondary side
22 Plugged and Stabilized as a contingency in case in-place fit-up bars were to fail
4 Plugged and Stabilized due to weld slag on secondary side SG C (10 Tubes Plugged) 2 ODSCC at TSP
1 Preventative No Degradation (Low Row Screened as High Residual Stress) 7 AVB Wear SG D (1 Tube Plugged) 1 AVB Wear Total Tubes Plugged to Date = 180 0.98%
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