TOKYO (AP) — Another day, another radioactive-water spill. The operator of the meltdown-plagued Fukushima Dai-ichi nuclear plant says at least 430 liters (110 gallons) spilled when workers overfilled a storage tank without a gauge that could have warned them of the danger.

The amount is tiny compared to the untold thousands of tons of radioactive water that have leaked, much of it into the Pacific Ocean, since a massive earthquake and tsunami wrecked the plant in 2011. But the error is one of many the operator has committed as it struggles to manage a seemingly endless, tainted flow.

Plant operator Tokyo Electric Power Co. said Thursday workers detected the water spilling from the top of one large tank when they were patrolling the site the night before. The tank is one of about 1,000 erected on the grounds around the plant to hold water used to cool the melted nuclear fuel in the broken reactors.

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