i have on good credibility this is what they are referring to - however i cannot say what might be in those containers or it's activity level
(proper working reactors regularly create barrels of waste - in the usa it was decided instead of being left in barrels on un-used lots it would be put mixed and paced into deep mines "back where it came from" so to speak)
are some of those barrels to be released barrels from fukashimas reactors that are "still operating normally" ? do they contain far less or more radiation?
(i GUARANTEE YOU the international law on normal reaction waste in the ocean is ABSOLUTELY NOT)
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More than seven years after the March 2011 Fukushima nuclear crisis, radioactive water is continuing to flow into the Pacific Ocean from the crippled No. 1 plant at a rate of around 2 billion becquerels a day, a study has found.
(this doesn't answer the "what's in the barrel" question above - which is data hard to find)