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RESEARCH PAPERS

Further Experimental Verification of Warm Prestressing Effect Under Pressurized Thermal Shock (PTS)

[+] Author and Article Information
H. Okamura, G. Yagawa

University of Tokyo, Tokyo, Japan

T. Hidaka

Japan Power Engineering and Inspection Corporation, Tokyo, Japan

Y. Urabe, M. Satoh, M. Tomimatsu

Takasago R&D Center, Mitsubishi Heavy Industries, Ltd., 2-1-1, Shinhama, Arai-cho, Takasago, Japan

K. Koyama, M. Iida

Kobe Shipyard & Machinery Works, Mitsubishi Heavy Industries, Ltd., Kobe, Japan

J. Pressure Vessel Technol 118(2), 174-180 (May 01, 1996) (7 pages) doi:10.1115/1.2842177 History: Received December 22, 1994; Revised August 08, 1995; Online February 11, 2008

Abstract

Fracture tests for the verification of WPS (warm prestressing) effect were carried out by using large flat specimens with very low toughness. Tensile and bending loads and thermal shock were applied simultaneously to the specimens with the realistically postulated flaw and the two times larger one in order to make the maximum KI cross the lower bound of KIC data. During the tests, loading was controlled to simulate the shape of KI versus temperature curve for the postulated PTS transient. Both the specimens did not break within the scatter band of KIC when KI was decreasing during cooling. KI values at fracture by reloading were beyond the upper bound of KIC . That is, the effectiveness of WPS was directly demonstrated for the PTS transients. Also, KI values at fracture can be predicted by Chell’s theory. As the test results, Japanese PWRs have sufficient temperature margin against PTS.

Copyright © 1996 by The American Society of Mechanical Engineers
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