Progress of target system operation at the pulsed spallation neutron source in J-PARC

Takada, Hiroshi; Naoe, Takashi; Kai, Tetsuya; Kogawa, Hiroyuki; Haga, Katsuhiro

Proceedings of 12th International Topical Meeting on Nuclear Applications of Accelerators (AccApp '15), p.297 - 304, 2016/00

In J-PARC, we have continuously been making efforts to operate a mercury target of a pulsed spallation neutron source with rated power of 1-MW. One of technical progresses is to mitigate cavitation damages at the target vessel front induced by the 3-GeV proton beam injection at 25 Hz. We have improved the performance of a gas micro-bubbles injection into the mercury target, resulting that no significant cavitation damages was observed on the inner surface of target vessel after operation for 2050 MWh with the 300-kW proton beam. Another progress is to suppress the release of gaseous radioactive isotopes, especially tritium, during the target vessel replacement. We have introduced a procedure to evacuate the target system by an off-gas processing apparatus when it is opened during the replacement operation, achieving to suppress the tritium release through the stack. For example, the amount of released tritium was 12.5 GBq, only 5.4% of the estimated amount, after the 2050 MWh operation. After these progresses, the operating beam power for the pulsed spallation neutron source was ramped up to 500-kW in April, 2015.

Behavior of tritium in the Purex process

Uchiyama, Gunzo; Fujine, Sachio; Maeda, Mitsuru; Sugikawa, Susumu; Tsujino, Takeshi

Solvent Extr. Ion Exch., 13(1), p.59 - 82, 1995/00

https://doi.org/10.1080/07366299508918261

no abstracts in English

Development of voloxidation process for tritium control in reprocessing

Uchiyama, Gunzo; *; ; Sugikawa, Susumu; Maeda, Mitsuru; Tsujino, Takeshi

JAERI-M 91-199, 35 Pages, 1991/11

JAERI-M-91-199.pdf:0.98MB

no abstracts in English

Developments of tritium technology for next-step fusion devices under JAERI-DOE(LANL) collaboration

Naruse, Yuji; Okuno, Kenji; Yoshida, Hiroshi; Konishi, Satoshi; Anderson, J. L.*; Bartlit, J. R.*

Journal of Nuclear Science and Technology, 27(12), p.1081 - 1095, 1990/12

https://doi.org/10.3327/jnst.27.1081

no abstracts in English

Tritium distribution ratios between the 30% tributyl phosphate(TBP)-normal dodecane(nDD) organic phase and uranyl nitrate-nitric acid aqueous phase

Fujine, Sachio; Uchiyama, Gunzo; Sugikawa, Susumu; Maeda, Mitsuru; Tsujino, Takeshi

JAERI-M 89-152, 14 Pages, 1989/10

JAERI-M-89-152.pdf:0.48MB

no abstracts in English