From Detailedpedia: Discharge of radioactive water of the Fukushima Daiichi Nuclear Power Plant
Last updated at 2024-08-21
"Discharge to ocean, treated water
Advanced Liquid Processing System (2013–)
"To prevent the reactor meltdowns from worsening, a continuous supply of new water is necessary to cool the melted fuel debris. As of 2013, 400 metric tonnes of water was becoming radioactively contaminated each day. The contaminated water is pumped out and combined into the reactor-cooling loop, which includes strontium–cesium removal (KURION, SURRY) and reverse osmosis desalination processes.
"In October 2012, TEPCO introduced the "Advanced Liquid Processing System" (ALPS, Japanese: 多核種除去設備), which is designed to remove radionuclides other than tritium and carbon-14. ALPS works by first pre-processing the water by iron coprecipitation (removes alpha nuclides and organics) and carbonate coprecipitation (removes alkali earth metals including strontium elements). The water is then passed through 16 absorbent columns to remove nuclides.
"Wastewater is pumped to ALPS along with the concentrated saltwater from desalination. As some tritium still remains, even treated water would require dilution to meet drinkable standards. Although carbon-14 is not removed, the content in pre-treatment water is low enough to meet drinkable standards without dilution.
"Japan's Nuclear Regulation Authority (NRA) approved the design of ALPS in March 2013. ALPS is to be run in three independent units and will be able to purify 250 tons of water per day. Unit "A" started operation in April. In June, unit A was found to be leaking water and shut down. In July, the cause was narrowed down to chloride and hypochlorite corrosion of water tanks; TEPCO responded by adding a rubber layer into the tanks. By August, all systems were shut down awaiting repair. One unit was expected to come online by September, with full recovery planned by the end of 2013.
"By September 2018, TEPCO reports that 20% of the water had been treated to the required level.
"By 2020, the daily buildup of contaminated water was reduced to 170 metric tonnes thanks to groundwater isolation installations. TEPCO reports that 72% of the water in its tanks, some from early trials of ALPS, needed to be #repurified. The portion of ready-to-discharge water raised to 34% by 2021, and to 35% by 2023.
"Some scientists expressed reservations due to potential #bioaccumulation of #ruthenium, #cobalt, #strontium, and #plutonium, which sometimes slip through the ALPS process and were present in 71% of the tanks.
[...]
"Ferenc Dalnoki-Veress, a scientist-in-residence at the Middlebury Institute of International Studies at Monterey, said regarding dilution that bringing in living creatures makes the situation more complex. Robert Richmond, a biologist from the University of Hawaiʻi, told the BBC that the inadequate #radiological and #ecological assessment raises the concern that #Japan would be unable to detect what enters the environment and 'get the genie back in the bottle'. Dalnoki-Veress, Richmond, and three other panelists consulting for the #PacificIslandsForum wrote that #dilution may fail to account for #bioaccumulation and exposure pathways that involve organically-bound tritium (#OBT)."
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https://www.detailedpedia.com/wiki-Discharge_of_radioactive_water_of_the_Fukushima_Daiichi_Nuclear_Power_Plant
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