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How the Fukushima fuel-debris sampling worked
Tokyo Electric Power Company Holdings (TEPCO) used specialized equipment in a controlled, remote operation. A telescopic device passed through an opening into Unit 2’s PCV and was lowered to the floor of the pedestal, the structure beneath the reactor. A sampling device at the end grasped small pieces of debris. This was not a conventional autonomous robot roaming through the reactor.
The first trial ran from September through November 2024. It was the first fuel-debris retrieval from a Fukushima Daiichi PCV, according to TEPCO’s retrieval archive. The operation was halted earlier in its preparation; at a September 10, 2024 press conference, Japan’s Minister of Economy, Trade and Industry, Saito, urged TEPCO to manage preparatory work and checks carefully, given the nature of the task. METI’s transcript records his statement.
The second trial sampled another location
TEPCO says debris was grasped on April 17, 2025, during the second trial, at a different location from the first. The material was placed in an indoor transport container on April 23 and taken off site by April 25 to a Japan Atomic Energy Agency (JAEA) facility in Ibaraki Prefecture for analysis. TEPCO’s account describes the operation and handling.
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What the first sample revealed
TEPCO and JAEA measured the first sample at 0.693 grams and reported an approximate gamma dose rate of 8 mSv/h for it. These are findings about the sample, not a dose received by a person. The mass is reported in their 2025 follow-up report; the dose-rate figure describes a measured rate, not a personal exposure. TEPCO and JAEA’s 2025 report gives the measurements.
Analysis identified uranium- and zirconium-bearing oxide phases, iron-nickel metal, and mixed phases. TEPCO interprets the composition and structure as consistent with fuel and cladding melting in the reactor core and mixing with other materials as the molten material moved into the PCV. That is an interpretation based on the sample, not a direct record of the entire accident sequence. The sample was crushed and divided so different portions could undergo different analyses; the reported work was not all performed on one untouched piece. The joint report describes the analysis and its purpose.
Why take such a small sample?
The purpose is to learn about the sampled area and improve estimates of how debris formed and what conditions existed in the reactor. Those findings can inform choices about future retrieval equipment and methods, safety measures, and storage. A sample this small can provide useful evidence, but it cannot establish the composition or condition of all debris across the damaged reactor.
Trial sampling is not full-scale removal
The trials were limited sampling operations intended to gather information and prepare for more difficult work. They should not be read as the start of full-scale fuel-debris removal. TEPCO’s July 2025 status report said the robotic arm was undergoing comprehensive inspection and cable replacement after deterioration was found during testing, and that the field-work schedule was under review at that time. That dated status does not establish a current schedule. TEPCO’s July 2025 report provides that update.
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What later Unit 2 inspections found
TEPCO’s archive lists Unit 2 investigation materials through April 2026. A report dated April 23, 2026 describes a fiberscope inspection through an existing reactor water-level instrument pipe. TEPCO obtained video and dose-rate data from approximately six metres below the N16A nozzle. Within the scope of that inspection, it found no major damage to the shroud or jet pump, but said the observations did not allow it to readily estimate where the fuel debris was located. This was an inspection, not a report that full-scale retrieval had begun. TEPCO’s Unit 2 investigation archive lists the later materials.
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