ML071360396
| ML071360396 | |
| Person / Time | |
|---|---|
| Site: | Wolf Creek  |
| Issue date: | 05/01/2007 |
| From: | David Rudland Dominion Engineering, Engineering Mechanics Corp of Columbus |
| To: | Office of Nuclear Reactor Regulation |
| MAURICIO GUTIERREZ, RES 301-415-1122 | |
| Shared Package | |
| ML071360367 | List: |
| References | |
| Download: ML071360396 (18) | |
Text
Innovative Structural Integrity Solutions NRC Welding Residual Stress Solutions as generated by Battelle and Emc2 David L. Rudland Engineering Mechanics Corporation of Columbus Meeting with Industry regarding Wolf Creek Sensitivity Analyses -
Welding Residual Stresses Dominion Engineering Inc. Offices May 1, 2007
2 Innovative Structural Integrity Solutions What have we done, and what is planned See Handout!!
Butt Welds only!!
3 Innovative Structural Integrity Solutions What have we done, and what is planned See Handout!!
Butt Welds only!!
4 Innovative Structural Integrity Solutions Hot Leg Geometry Alloy 82/182 Butter SS304 A516-70 SS304 Alloy 182 17 1
4 3
2 5
9 8
7 6
11 10 14 13 12 15 16 81 mm 86.4 mm OD = 918 mm ID = 756 mm 12.57 mm
5 Innovative Structural Integrity Solutions Path of Maximum Stress SS304 A516-70 Alloy 182 In many cases, maximum stresses were extracted along a path that was non-planar Maximum stress path
6 Innovative Structural Integrity Solutions Weld Centerline Stresses Hot Leg - Ground ID Alloy 182
-300
-200
-100 0
100 200 300 0
50 100 Distance from ID (mm)
Axial Stress (Mpa)
Weld (max-mean)
Weld (max +2 sigma)
Weld (max -2 sigma)
Material variability
7 Innovative Structural Integrity Solutions Planar versus Non-planar Stresses Hot Leg - Ground ID Alloy 182
-300
-200
-100 0
100 200 300 0
20 40 60 80 100 Distance from ID (mm)
Axial Stress (Mpa)
Weld (max-mean)
Weld Center Line Butter (max-mean)
(1) at the weld centerline, (2) along the path in the weld where the stresses are highest, and (3) along the path in the buttered region where the stresses are highest (2)
(1)
(3)
8 Innovative Structural Integrity Solutions Curve-fitting Welding Stresses y = -39.381x4 + 73.31x3 - 33.189x2 - 1.0839x + 1.3 R2 = 0.9292
-1.5
-1
-0.5 0
0.5 1
1.5 0
0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1
Normalized distance fron ID surface Weld residual stress/Weld yield stress FE Values Poly. (FE Values)
Inherent error
9 Innovative Structural Integrity Solutions With Repair
-1
-0.5 0
0.5 1
1.5 0
0.2 0.4 0.6 0.8 1
Nomalized Distance from ID Surface Residual Stress/Yield Stress Hot leg Hot leg with ID repair 360 deg - 15% deep ID repair - Last pass ID weld
10 Innovative Structural Integrity Solutions Effects of Diameter
-1
-0.5 0
0.5 1
1.5 2
0 0.2 0.4 0.6 0.8 1
Nomalized Distance from ID Surface Residual Stress/Yield Stress Hot leg - no repair Hot Leg - 360 ID repair Surge - 360 ID repair Spray - no repair
11 Innovative Structural Integrity Solutions Effects of Operating Stress
-0.6
-0.4
-0.2 0
0.2 0.4 0.6 0.8 1
1.2 1.4 0
0.2 0.4 0.6 0.8 1
Normalized distance from ID WRS/Yield WRS WRS+10ksi Shift WRS by 10ksi Stainless Steel weld
12 Innovative Structural Integrity Solutions Effects of Hardening Law 0
0.1 0.2 0.3 0.4 0.5 0.6 0.7 0
2000 4000 6000 8000 10000 12000 14000 Welding Time (s)
PEEQ Isotropic Hardening Kinematic Hardening Steps represent application of other welding passes Looking at the effects of hardening law on CRDM J-Weld WRS - Will be investigating in Butt Welds!!
One welding pass
13 Innovative Structural Integrity Solutions Drain Line Analysis Nozzle A182 weld Safe end SS weld Machined area Pipe Butter 2-inch diameter t = 0.54 inch Buttering of the nozzle end with A182, 5 passes Stress relief of nozzle at 1100F for four hours, cool Welding safe-end to the nozzle, A182 weld, 11 passes OD weld repair, two passes ground out, and re-weld Boring of the welded structure's ID to match pipe ID Welding of the SS304 pipe to the safe-end with SS weld, 10 passes Hydro testing 125% of 2500psi and room temperature Add operating condition, 600F, 2500psi About 3t
14 Innovative Structural Integrity Solutions Weld Centerline Stresses
-400
-300
-200
-100 0
100 200 300 400 0
0.2 0.4 0.6 0.8 1
Distance from ID, inch Axial stress at weld centerline, MPa
15 Innovative Structural Integrity Solutions Weld Stresses on ID
-350
-300
-250
-200
-150
-100
-50 0
50 100 150 0
20 40 60 80 100 120 Distance from second weld centerline, mm Axial stress at ID, MPa After first weld After second weld First weld centerline End of butter Before hydrotest
16 Innovative Structural Integrity Solutions WRS at Different Locations
-500
-400
-300
-200
-100 0
100 200 300 400 500 0
0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1
Normalized Distance from ID Axial stress, MPa End of butter - no butter weld Fusion line - No butter weld End of butter - butter weld + no SR Fusion - butter weld + no SR End of butter - butter weld and SR Fusion - butter weld and SR End of butter - butter weld, SR, repair Fusion - butter weld, SR, repair Upper bound fit Upper bound + Sm Crack depth After welding the A182 weld, SS weld, hydrotest, and operating conditions
17 Innovative Structural Integrity Solutions Comparison with MRP-106
-500
-400
-300
-200
-100 0
100 200 300 400 500 0
0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1
Normalized Distance from ID Axial stress, MPa MRP106 Emc2 after hydrotest Emc2 after SS weld Emc2 after A182 weld ASME
18 Innovative Structural Integrity Solutions Plans for Wolf Creek
Will be conducting WRS for Wolf Creek
Plans are still being developed
Some items that may be investigated:
Unusual welding repairs, i.e., SS weld build-up on safe-end A182 filler for thermal sleeve - Also thermal sleeve weld Stainless steel safe end weld Effects of operating loads - plasticity redistribution of WRS Other issues that may arise from this meeting