The operator of Japan’s crippled Fukushima power plant on Monday began removing atomic fuel from inside a building housing one of the reactors that melted down in 2011.

The delicate operation represents the first time the Tokyo Electric Power Co (TEPCO) has pulled out fuel rods from inside a highly contaminated building containing the melted-down reactor, and comes four years behind schedule.

Due to high radiation levels, technicians used remote-controlled equipment to haul fuel from a “storage pool” inside the building.

Operations were briefly suspended early Monday afternoon after a problem with the equipment removing the fuel, but resumed shortly afterwards.

“We finally started this work. We will spend two years removing 566 units of fuel from reactor three,” said Takahiro Kimoto, a TEPCO spokesman.

TEPCO removed four units as planned on Monday, with workers continuing to remove debris that have fallen inside the pool and other areas, Kimoto told reporters.

“Factors such as removal of debris and various troubles have caused delays, which we realise have caused significant worries to people in the region and others,” Kimoto said.

“Putting safety as our priority, we will carefully continue this work,” he promised.

Engineers have had to contend with clearing earthquake debris inside the building and an array of other technical challenges, said TEPCO spokeswoman Yuka Matsubara.

“We had to proceed carefully (to remove debris), and we needed to take measures as dust would waft up and increase radiation readings,” she told AFP.

TEPCO engineers will not yet attempt to extract molten nuclear fuel that remains deep inside the mangled reactor. This is considered the most difficult part of the massive clean-up operation and is not expected to begin until 2021.

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