ML033580372

and 11/20/2003 Slides, Braidwood Unit 2 Refuel 10 Fall 2003 Stream Generator Inspection Results Summary

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: ML033580056 ML033580372
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

Preheater Region Feedwater Area where backing bars found 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% 4