Movie of sodium leaking accident in Monju fast breeder reactor released

It occurred in 1995Fast breeder reactor "Monju"A movie that shoots the situation just after the sodium leakage accident has been released on YouTube.

In the interview at the time of the accident, a very short edited edition was made public, and it was said that the staff who took the conference killed himself afterwards, but what exactly do you see?

Details are as below.
This is the movie. It seems that a worker wearing protective clothing is checking where the sodium leak has occurred. Misty metal sodium stands around, and on the floor metal sodium that is solid like snow is piled up.
YouTube - NPJ video news The 3 rd video "Monju that tried to conceal flames, video immediately after sodium leak"


Although it is said that this metallic sodium has no radioactivity, why on earth did not it be released at the time of the accident ...?