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Wakui, Takashi; Kogawa, Hiroyuki; Haga, Katsuhiro; Futakawa, Masatoshi; Uchiyama, Naoyoshi*; Nakamura, Koji*
JAEA-Technology 2009-041, 71 Pages, 2010/03
JAEA-Technology-2009-041.pdf:21.19MB
The mercury target vessel installed in J-PARC consists of the mercury vessel and the safety hull, which corves the mercury vessel, to prevent the leak of mercury to outside at the failure of the mercury vessel. The safety hull is a double-walled structure to make the cooling channel of heavy water. The helium gas in a space between the mercury vessel and the safety hull can prevent the inflow of mercury into heavy water at the failure of the mercury vessel. The design pressure of each medium is 0.5 MPaG. The temperature of the mercury target vessel and mercury rises at a moment of the proton beam injection and then the thermal shock and the deformation of the mercury vessel occur. The mercury target vessel is imposed by not only static load due to the inner pressure and dead weight but also repeated dynamic load. Based on loading conditions, the structural integrity of the mercury target vessel was evaluated using numerical analyses. The results were described as following.
Wakui, Takashi; Kogawa, Hiroyuki; Haga, Katsuhiro; Futakawa, Masatoshi; Hayashi, Ryoichi*; Uchiyama, Naoyoshi*; Okamoto, Yoshinao*; Nakamura, Koji*
JAEA-Technology 2009-040, 96 Pages, 2010/03
JAEA-Technology-2009-040.pdf:35.52MB
The construction of materials and life science experimental facility in J-PARC project had been completed. The mercury target vessel consists of triple-walled structure in order to prevent the leak of mercury to outside at the failure of the mercury vessel and to remove the heat of the safety hull, which covers the mercury vessel, due to the injection of the pulsed proton beams. The high fabrication accuracy is required for the mercury target vessel assembled by the welding. In this report, the required specification and basic structure of parts in the mercury target vessel are described and the fabrication procedure of the mercury target vessel by the vender is reported. In the fabrication of the mercury target vessel, there were many troubles such as large deformation due to the welding and then the vender repaired and brought the mercury target vessel to completion. Furthermore, improvements for the design and fabrication of the mercury target are reported.