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Report No.
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Risk assessment of the mercury leak at Materials & Life Science Experimental Facility of J-PARC

Kasugai, Yoshimi ; Kai, Tetsuya  

Evaluations of radiation dose at the site boundary for the Materials and Life Science Experimental Facility (MLF) at J-PARC were carried out supposing that the mercury used as the neutron target happened to leak from the mercury circulation system during 1 MW operation. As a result of the evaluation, the dose of external exposure at the site boundary was estimated to be 30$$mu$$Sv, which was almost given by the radioactive noble gas produced via spallation reactions. The inner exposure of radioactive mercury and tritium was estimated to be 0.1$$mu$$Sv in total. Since the estimated dose was enough low in comparison with a personal annual dose from natural radioactivity, even though the event scenario was made conservatively, it was shown that MLF has high safety margin for the leak of radioactivity.

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