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Davis-Besse Small Bore Class 1 Piping Socket Weld Destructive ExaminationAuthors:
Ryan Hosler (AREVA)
Beverly Cyrus (AREVA)
Steve Fyfitch (AREVA); Presenter
Trent Henline (FENOC)
Non-Proprietary
EPRI International Light Water Reactor Materials Reliability Conference and Exhibition, August 1-4 (2016)
Non-Proprietary
EPRI International Light Water Reactor Materials Reliability Conference and Exhibition, August 1-4 (2016)
Davis-Besse Small Bore Class 1 Piping Socket Weld Destructive Examination–
Steve Fyfitch – August 2016 - p.3
IntroductionDavis-Besse LRA includes a requirement to volumetrically or
destructively examine (DE) welds (that have been exempted due
to size by ASME XI) as a result of age-related OE
Weld selection was based on SCC susceptibility
Highest temperature
Dead legs (stagnant)
DE was selected because
each DE counts as two NDE in the LR AMP
42 of the most susceptible welds were being removed due to SG replacement
15 of those welds were chosen as a representative sample to satisfy the LR AMP
requirements for socket welds
Non-Proprietary
EPRI International Light Water Reactor Materials Reliability Conference and Exhibition, August 1-4 (2016)
Davis-Besse Small Bore Class 1 Piping Socket Weld Destructive Examination–
Steve Fyfitch – August 2016 - p.4
Locations Examined:SG Channel Head Drain Lines
SG 1-1 Drain Line
SG 1-2 Drain Line
Non-Proprietary
EPRI International Light Water Reactor Materials Reliability Conference and Exhibition, August 1-4 (2016)
Davis-Besse Small Bore Class 1 Piping Socket Weld Destructive Examination–
Steve Fyfitch – August 2016 - p.5
Locations Examined:Hot Leg High Point Vent Lines
HL HPV Lines at SG 1-1
HL HPV Lines at SG 1-2
Non-Proprietary
EPRI International Light Water Reactor Materials Reliability Conference and Exhibition, August 1-4 (2016)
Davis-Besse Small Bore Class 1 Piping Socket Weld Destructive Examination–
Steve Fyfitch – August 2016 - p.6
General Sectioning Plan
Mount/Polish/Etch 0° Face
Mount/Polish/Etch 270° Face
Mount/Polish/Etch 90° Face
Mount/Polish/Etch 180° Face
Non-Proprietary
EPRI International Light Water Reactor Materials Reliability Conference and Exhibition, August 1-4 (2016)
Davis-Besse Small Bore Class 1 Piping Socket Weld Destructive Examination–
Steve Fyfitch – August 2016 - p.7
Socket Weld GapWeld
Gap
Non-Proprietary
EPRI International Light Water Reactor Materials Reliability Conference and Exhibition, August 1-4 (2016)
Davis-Besse Small Bore Class 1 Piping Socket Weld Destructive Examination–
Steve Fyfitch – August 2016 - p.8
SG 1-1 Drain Line Weld 70° Face
8x
8x180° Face
900x
50x
Non-Proprietary
EPRI International Light Water Reactor Materials Reliability Conference and Exhibition, August 1-4 (2016)
Davis-Besse Small Bore Class 1 Piping Socket Weld Destructive Examination–
Steve Fyfitch – August 2016 - p.9
SG 1-1 Drain Line Weld 8 (270° Face of 8-A2)
8x
Non-Proprietary
EPRI International Light Water Reactor Materials Reliability Conference and Exhibition, August 1-4 (2016)
Davis-Besse Small Bore Class 1 Piping Socket Weld Destructive Examination–
Steve Fyfitch – August 2016 - p.10
SG 1-1 Drain Line Weld 8 (270° Face of 8-A2)
25x
1500x
Non-Proprietary
EPRI International Light Water Reactor Materials Reliability Conference and Exhibition, August 1-4 (2016)
Davis-Besse Small Bore Class 1 Piping Socket Weld Destructive Examination–
Steve Fyfitch – August 2016 - p.11
SG 1-1 Drain Line Weld 8 (270° Face of 8-A1a)
8x
Non-Proprietary
EPRI International Light Water Reactor Materials Reliability Conference and Exhibition, August 1-4 (2016)
Davis-Besse Small Bore Class 1 Piping Socket Weld Destructive Examination–
Steve Fyfitch – August 2016 - p.12
SG 1-1 Drain Line Weld 8 (270° Face of 8-A1a)
50x
Non-Proprietary
EPRI International Light Water Reactor Materials Reliability Conference and Exhibition, August 1-4 (2016)
Davis-Besse Small Bore Class 1 Piping Socket Weld Destructive Examination–
Steve Fyfitch – August 2016 - p.13
SG 1-2 Drain Line Weld 23
8x
Non-Proprietary
EPRI International Light Water Reactor Materials Reliability Conference and Exhibition, August 1-4 (2016)
Davis-Besse Small Bore Class 1 Piping Socket Weld Destructive Examination–
Steve Fyfitch – August 2016 - p.14
SG 1-2 Drain Line Weld 23
Non-Proprietary
EPRI International Light Water Reactor Materials Reliability Conference and Exhibition, August 1-4 (2016)
Davis-Besse Small Bore Class 1 Piping Socket Weld Destructive Examination–
Steve Fyfitch – August 2016 - p.15
SG 1-2 Drain Line Weld 24 (180° Face)
8x
Non-Proprietary
EPRI International Light Water Reactor Materials Reliability Conference and Exhibition, August 1-4 (2016)
Davis-Besse Small Bore Class 1 Piping Socket Weld Destructive Examination–
Steve Fyfitch – August 2016 - p.16
SG 1-2 Drain Line Weld 24 (180° Face)
8x200x 500x
Non-Proprietary
EPRI International Light Water Reactor Materials Reliability Conference and Exhibition, August 1-4 (2016)
Davis-Besse Small Bore Class 1 Piping Socket Weld Destructive Examination–
Steve Fyfitch – August 2016 - p.17
SG 1-2 Drain Line Weld 24 (270° Face)
8x8x
Non-Proprietary
EPRI International Light Water Reactor Materials Reliability Conference and Exhibition, August 1-4 (2016)
Davis-Besse Small Bore Class 1 Piping Socket Weld Destructive Examination–
Steve Fyfitch – August 2016 - p.18
SG 1-2 Drain Line Weld 24 (270° Face)
8x200x
500x
600x
Non-Proprietary
EPRI International Light Water Reactor Materials Reliability Conference and Exhibition, August 1-4 (2016)
Davis-Besse Small Bore Class 1 Piping Socket Weld Destructive Examination–
Steve Fyfitch – August 2016 - p.19
SG 1-1 HL HPV Line Weld 3C
8x
Non-Proprietary
EPRI International Light Water Reactor Materials Reliability Conference and Exhibition, August 1-4 (2016)
Davis-Besse Small Bore Class 1 Piping Socket Weld Destructive Examination–
Steve Fyfitch – August 2016 - p.20
SG 1-1 HL HPV Line Weld 3C
200x 1500x
Non-Proprietary
EPRI International Light Water Reactor Materials Reliability Conference and Exhibition, August 1-4 (2016)
Davis-Besse Small Bore Class 1 Piping Socket Weld Destructive Examination–
Steve Fyfitch – August 2016 - p.21
Summary of Results:SG Channel Head Drain Lines
SG 1-1 Drain Line SG 1-2 Drain Line
1-5% TW
0.084” gap
40-65% TW
0.031” gap
No Flaw
0.077” gap
No Flaw
0.048” gap
40-50% TW
0.130” gap
20-35% TW
0.087” gap
1-5% OD
0.143” gap
Non-Proprietary
EPRI International Light Water Reactor Materials Reliability Conference and Exhibition, August 1-4 (2016)
Davis-Besse Small Bore Class 1 Piping Socket Weld Destructive Examination–
Steve Fyfitch – August 2016 - p.22
HL HPV Lines at SG 1-1
HL HPV Lines at SG 1-2
Summary of Results:Hot Leg High Point Vent Lines
1-5% TW
No gap
No Flaw
0.065” gap
No Flaw
No gap
No Flaw
0.048” gap
No Flaw
0.145” gap
No Flaw
0.126” gap
No Flaw
No gap
No Flaw
0.032” gap
Non-Proprietary
EPRI International Light Water Reactor Materials Reliability Conference and Exhibition, August 1-4 (2016)
Davis-Besse Small Bore Class 1 Piping Socket Weld Destructive Examination–
Steve Fyfitch – August 2016 - p.23
Conclusions
Cracking originating at or near the weld root was observed in 5 of the 15
socket welds examined
Flaws indicative of TGSCC with some IGSCC and IGA
Three synergistic requirements of SCC met (consistent with laboratory
testing and operating experience)
Susceptible Material
Austenitic stainless steel (Type 316 and 308/308L)
Aggressive Environment
Stagnant water can accumulate elevated levels of dissolved O2 and Cl, which can
be exacerbated at the weld root by the crevice created by the socket weld geometry
Temperature likely >200°F at locations of indications due to proximity to SG/HL
Sustained Tensile Stress
Socket weld geometry creates a stress concentration at the weld root
Non-Proprietary
EPRI International Light Water Reactor Materials Reliability Conference and Exhibition, August 1-4 (2016)
Davis-Besse Small Bore Class 1 Piping Socket Weld Destructive Examination–
Steve Fyfitch – August 2016 - p.24
Questions?
