nuclear-news

TEPCO planning to send probe into Fukushima nuke reactor

By TOMOYUKI SUZUKI/ Staff Writer, March 4, 2026 ,
https://www.asahi.com/ajw/articles/16341286

Tokyo Electric Power Co. will soon launch a probe, the first of its kind, into the pressure vessel at one of the hobbled reactors at its Fukushima No. 1 nuclear power plant to scope out the current conditions.

The effort is part of TEPCO’s long-standing goal of retrieving melted nuclear fuel debris, left in the aftermath of the triple reactor meltdowns following the 2011 Great East Japan Earthquake and tsunami.

TEPCO officials said they are planning to insert a camera-equipped fiberscope into the plant’s No. 2 reactor to shoot footage and measure radiation levels during the first half of fiscal 2026 between April and September.

An estimated 880 tons of fuel debris remain inside the No. 1, 2 and 3 reactors at the Fukushima No. 1 plant.

TEPCO plans to approach the contaminated debris, which remains in the pressure vessels, from the tops of the reactor buildings and pulverize the debris to reduce the volume and collect it by sucking it from the side or by other means.

TEPCO officials are hoping, during the planned probe, to monitor the interior of the pressure vessel visually and ascertain the radiation levels on a location-by-location basis to help work out concrete methods for retrieving the fuel debris.

The fiberscope to be used in the probe, which resembles an endoscope, will be inserted into the pressure vessel from the side through piping.

The officials said they will be probing not the core part of the vessel but the outer side of a shroud of stainless steel, which has been installed to surround nuclear fuel, to determine, among other things, if the shroud has been deformed and if there is any debris in sight.

They said they will conduct mock-up drills in the days and months to come. They added that they will take measures to block air from leaking from the pressure vessel’s interior so workers will not be exposed to radiation.

The probe was initially scheduled to begin in fiscal 2024, but the work has been delayed because the development of a dosimeter-equipped fiberscope and other processes have turned out to be more time-consuming than expected.

“When the distribution of dose levels is known, that could, depending on the circumstances, help give an estimate of the amount of residual fuel (which has yet to turn into debris),” said Akira Ono, president of TEPCO’s Fukushima Daiichi Decontamination & Decommissioning Engineering Co., which is overseeing the corresponding processes at the Fukushima No. 1 nuclear plant.

TEPCO plans to start large-scale retrieval of the Fukushima No. 1 plant’s debris at its No. 3 reactor in fiscal 2037 or later.

The dose levels and circumstances of the areas surrounding the reactor buildings are not the same for the No. 1, 2 and 3 reactors.

TEPCO officials said they have set a target date of 2027 for studying the design of debris removal equipment and other specifics for those reactors.

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March 8, 2026 - Posted by Christina Macpherson | Fukushima continuing, wastes