Ongoing Challenges with Reactor 2 Debris Retrieval: Delays, Failures, and High Radiation

Thirteen Years Later, Access Remains Limited

Despite ongoing efforts, Fukushima Daiichi’s Reactor 2 remains largely inaccessible due to severe radiation and equipment malfunctions. The trial fuel debris retrieval has encountered numerous setbacks, further highlighting the complexity of the decommissioning process.

Core Removal Delayed by 3 Years

Originally planned for 2021, the fuel debris extraction from Reactor 2 has faced multiple delays. The remote-operated telescopic arm used to retrieve fuel debris from the primary containment vessel (PCV) encountered operational issues. Radiation levels near the reactor pressure vessel (RPV) and inside the PCV remain high, complicating every step of the process.

Recent Camera Malfunctions Hinder Progress

On September 17, 2024, two crucial cameras—the end-tool monitoring camera and arm-tip camera—malfunctioned, cutting off critical visual data needed for the operation. Preliminary investigations suggest that the failure was due to radiation-induced electrostatic charging, which may have disrupted camera signals transmitted via optical fiber cables​.

TEPCO replaced the cameras on October 18 after a detailed investigation of the cable connections, video converters, and insulation resistance measurements. Despite this, the initial malfunction’s root cause has not been fully identified​. Further tests on the telescopic device and a nitrogen purge to stabilize the work environment are planned before resuming fuel debris retrieval​.

High Radiation Poses Continuous Threat

Radiation levels in Reactor 2 remain a significant barrier, with workers limited to remote operations using robotic arms and radiation shielding. While TEPCO has attempted various measures to reduce worker exposure, including heavy protective equipment and improved remote controls, high radiation complicates both routine checks and complex operations like debris retrieval​.

Uncertain Future of Reactor 2 Decommissioning

The prolonged setbacks are a sobering reminder of the magnitude of the task. With an estimated 880 tons of fuel debris to retrieve across three reactors, the path to full decommissioning remains uncertain. TEPCO aims to continue improving remote systems and shielding to finally begin substantial fuel debris removal from Reactor 2.

Source (including the photo) https://www.tepco.co.jp/decommission/information/newsrelease/