Workers shut down a nuclear reactor in southern New Jersey after they detected a leak in the containment building.

Salem Unit 1 in Lower Alloways Creek Township shut down after workers discovered slightly radioactive water leaking at a rate of four gallons a minute Thursday, said officials at the Nuclear Regulatory Commission (NRC).

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The initial investigation determined the leak came from a pressurizer spray valve used in the reactor coolant system.

PSEG Nuclear said Friday about 4,800 gallons leaked and the water went through the plant drain system as designed. The entire system holds 90,000 gallons.

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Regulators said the spill remained confined to the plant’s containment building and there was no threat to the public or workers.

The utility said the reactor will return to service by the beginning of the week.

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