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Oral presentation

Report on radiation control of TRACY

Masuyama, Koichi; Arakawa, Yuto; Otsuka, Yoshikazu; Yokosuka, Yoshiyuki; Kobayashi, Makoto; Akiyama, Isamu; Shimizu, Isamu

no journal, , 

no abstracts in English

Oral presentation

Evaluation of neutron instruments shield in J-PARC Materials and Life Science Experimental Facility

Oi, Motoki; Harada, Masahide; Kai, Tetsuya; Aizawa, Kazuya; Sato, Koichi; Masuyama, Koichi; Kasugai, Yoshimi

no journal, , 

In the J-PARC Materials and Life Science Experimental Facility (MLF), material science experiments using muon and neutron beam are performed. In the MLF, proton beam power was 300KW at May 2014 and it is planning to enhance to 1MW. For proton beam enhancement, we performed evaluation of the shielding performance of the neutron beam instruments. As a result, dose on the shield surface of 16 neutron instruments are sufficiently low for 1MW proton beam operation. However, 4 neutron instruments show high dose rate in particular neutron beam conditions. For these neutron instruments, we have checked the drawings and recalculate the shielding performance and considered a cause. Then based on the measurement results, some shield are added for these four neutron instruments and dose rate are reduced sufficiently to 1MW proton beam operation.

Oral presentation

Release behavior of $$^{203}$$Hg in J-PARC Materials & Life Science Experimental Facility

Sato, Koichi; Masuyama, Koichi; Tajima, Takahiro; Yoshino, Koji; Seki, Kazunari; Kasugai, Yoshimi; Miyamoto, Yukihiro

no journal, , 

Various kinds of experiments on material and biological science have been carried out using neutrons and muons generated by bombarding the mercury and muon target with high-energy (3 GeV) and high-intense (1MW) protons in the Materials and Life Science Experimental Faculty (MLF) of Japan Proton Accelerator Complex (J-PAPC). It was found that radioactive nuclide of $$^{203}$$Hg induced in the mercury target during the beam operation was released to the environment via the ventilation system from the stack at specific times during maintenance periods. The weekly-average concentrations of $$^{203}$$Hg in the stack were 2.4 $$times$$10$$^{-10}$$$$sim$$1.5 $$times$$10$$^{-9}$$ Bq/cm$$^{3}$$, which was much less than the legal limit by a factor of 1/10,000. The release behavior of $$^{203}$$Hg will be reported in the presentation.

Oral presentation

Radiation monitoring on replacement work of the mercury target vessel in J-PARC

Masuyama, Koichi; Sato, Koichi; Yoshino, Koji; Tajima, Takahiro*; Seki, Kazunari; Kasugai, Yoshimi; Miyamoto, Yukihiro

no journal, , 

The mercury target vessel used in the Materials and Life Science Experimental Facility (MLF) in the Japan Accelerator Research Complex (J-PARC) needs to be replaced periodically. The replacement work, which is conducted in the hot cell, associates with release of radioactive materials produced via spallation reactions between protons and mercury. Therefore we monitored radioactivity of dust and air samples in the hot cell. By the monitoring, we newly found peculiar phenomena on the behavior of radioactive products, which is important for radiation control. In this work, we will show the monitoring data and the new observation.

Oral presentation

Fuel and NFBC assemblies design for the next generation sodium-cooled fast reactor, 2; Optimization of a radial shielding structure

Saito, Hiroyuki*; Higurashi, Koichi*; Masuyama, Daisuke*; Oki, Shigeo; Ohgama, Kazuya; Maeda, Seiichiro

no journal, , 

no abstracts in English

Oral presentation

Design of transfer cask for mercury target vessel irradiated at J-PARC spallation neutron source

Harada, Masahide; Uchida, Toshitsugu; Sekijima, Mitsuaki; Haga, Katsuhiro; Kogawa, Hiroyuki; Kinoshita, Hidetaka; Takada, Hiroshi; Sato, Koichi; Masuyama, Koichi

no journal, , 

no abstracts in English

Oral presentation

Change of radiation control area classification at the MLF experimental halls toward high power application

Harada, Masahide; Kawakami, Kazuhiro*; Aizawa, Kazuya; Soyama, Kazuhiko; Sato, Koichi; Masuyama, Koichi; Kasugai, Yoshimi

no journal, , 

no abstracts in English

Oral presentation

Risk assessment on the off-normal event of the J-PARC neutron source

Kasugai, Yoshimi; Sato, Koichi; Masuyama, Koichi; Seki, Kazunari; Miyamoto, Yukihiro; Kai, Tetsuya; Harada, Masahide; Haga, Katsuhiro; Takada, Hiroshi

no journal, , 

no abstracts in English

Oral presentation

Information disclosure of radiation measurement equipment in intranet

Masuyama, Koichi; Ishii, Daiki; Taki, Kosei; Kirihara, Yoichi; Nidaira, Atsushi; Tachibana, Haruo; Kawasaki, Katsuya

no journal, , 

no abstracts in English

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