GA 1 - 2 - 3 - 4 - AP 1 - 2 - 3 - 4 - 5 - NT 1 - 2 - 3 - 4 - 5 - 6 → Vol.1No.2 | ||||
Vol.1, No.1, NT6
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IHSI (Induction Heating Stress Improvement)
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TOSHIBA CORPORATION | ||||
KEYWORDS: |
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1. Technical summary | ||||
Classification (I: Inspection, II: Repair, III: Replacement, IV: Preventive Maintenance, V: Others) | ||||
The outer surface of an objective pipe is heated with high frequency induction heating in order to induce temperature difference through the thickness of the heat effective zone of the pipe with simultaneous water cooling of inner surface. Through this process, residual stress in the inner surface is improved for compression by induced thermal stress. | ||||
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2. Scope | ||||
(1) Components |
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3. Features | ||||
(1) Prevent initiation of SCC crack at the sensitized zone by stress improvement near the weld of pipe inner surface |
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Fig. 3 Residual Stress Distribution on the Inside Surface Along the Axial direction of the Piping (Typical Groove) |
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Fig. 4 Residual Stress Distribution on the Inside Surface Along the Axial direction of the Piping (Narrow Groove) |
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4. Examples of Application | ||||
(1) This technique was applied to BWR PLR piping. |
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Fig. 5 Field Application of IHSI |
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5. Reference | ||||
(1) Teruaki Sato, Kazuyoshi Yonekura, Satoshi Hongo, Shoji Hayashi and Hideyo Saito,”Introduction of Repair/ Maintenance Techniques for SCC in Primary Loop Recirculation System Piping”, Maintenology,Vol.3,No.3(2004) (in Japanese). (in English) |
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6. Contact | ||||
Japan Society of Maintenology (ejam@jsm.or.jp) | ||||