As a countermeasure against high residual stress, we have developed some residual stress improvement methods, as Water Jet Peening (WJP) [1] [2] for components installed in water, Shot Peening by Ultrasonic-wave vibration (USP) for components installed in air, and outer surface irradiated Laser Stress Improvement Process (L-SIP) [3] for components being able to approach from outer surface only. WJP is applied to Reactor Vessel (RV) outlet/inlet nozzle safe-end joints (Alloy600 weld metal), RV Bottom Mounted Instrument (BMI) inner surface and J-weld. Especially, it is difficult to apply BMI because BMI inner surface is very narrow space (inner diameter; approximately 10–15mm) and BMI J-weld is complicated 3-dimensional form. On the occasion of actual application, we carry out the verification tests and check that a stress improvement was effective as one of PWSCC mitigation. And the compressive stress induced by WJP is verified to continue to exist under actual plant operation conditions. Thus, in addition to replacing the material with Alloy 690, converting the residual stress to the compressive can prevent the occurrence of PWSCC.
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16th International Conference on Nuclear Engineering
May 11–15, 2008
Orlando, Florida, USA
Conference Sponsors:
- Nuclear Engineering Division
ISBN:
0-7918-4814-0
PROCEEDINGS PAPER
Reliability of Water Jet Peening as Residual Stress Improvement Method for Alloy 600 PWSCC Mitigation Available to Purchase
Koji Okimura,
Koji Okimura
Mitsubishi Heavy Industries, Ltd., Kobe, Japan
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Takao Konno,
Takao Konno
Mitsubishi Heavy Industries, Ltd., Kobe, Japan
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Marekazu Narita,
Marekazu Narita
Mitsubishi Heavy Industries, Ltd., Kobe, Japan
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Takahiro Ohta,
Takahiro Ohta
Mitsubishi Heavy Industries, Ltd., Takasago, Japan
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Masahiko Toyoda
Masahiko Toyoda
Mitsubishi Heavy Industries, Ltd., Takasago, Japan
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Koji Okimura
Mitsubishi Heavy Industries, Ltd., Kobe, Japan
Takao Konno
Mitsubishi Heavy Industries, Ltd., Kobe, Japan
Marekazu Narita
Mitsubishi Heavy Industries, Ltd., Kobe, Japan
Takahiro Ohta
Mitsubishi Heavy Industries, Ltd., Takasago, Japan
Masahiko Toyoda
Mitsubishi Heavy Industries, Ltd., Takasago, Japan
Paper No:
ICONE16-48375, pp. 565-570; 6 pages
Published Online:
June 24, 2009
Citation
Okimura, K, Konno, T, Narita, M, Ohta, T, & Toyoda, M. "Reliability of Water Jet Peening as Residual Stress Improvement Method for Alloy 600 PWSCC Mitigation." Proceedings of the 16th International Conference on Nuclear Engineering. Volume 1: Plant Operations, Maintenance, Installations and Life Cycle; Component Reliability and Materials Issues; Advanced Applications of Nuclear Technology; Codes, Standards, Licensing and Regulatory Issues. Orlando, Florida, USA. May 11–15, 2008. pp. 565-570. ASME. https://doi.org/10.1115/ICONE16-48375
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