Submission of the 1st report on the radioactive material leak at the HD Facility of J-PARC (Accelerator Facility Accident Report) on May 31 - full version - http://j-parc.jp/en/topics/HDAccident20130531.pdf
A delay in suspending the operation of the accelerator complex and a delay in turning off the ventilation fans at the Hadron Experimental Facility (HD Facility) http://j-parc.jp/en/topics/HDAccident20130627.pdf
A summary of the accident at HD Facility on May 23 2013 (based on the Japanese documents publicized at the J-PARC website on May 25 and May 29) http://j-parc.jp/en/topics/summary20130531.pdf