The Fukushima nuclear power plant in Japan has leaked more than 600 liters of water, forcing it to briefly suspend cooling operations at a spent-fuel pond at the weekend, but none is thought to have escaped into the ocean, the plant’s operator and domestic media said.

The operator of the stricken plant, the Tokyo Electric Power Co (Tepco) (TYO: 9501), reported two main leakages on its Web site on Sunday, one from a pump near the plant’s office building and another from a back-up cooling system at reactor No.4, reports Reuters.

“The cooling water is from a filtrate tank for fire extinction and doesn’t contain radioactive materials,” Tepco said of the incident at reactor No. 4. It added that some water from the other leakage had flowed into a drain.

The Nikkei newspaper Monday quoted Tepco as saying around 40 liters had leaked from the pool-cooling system of the No. 4 reactor Sunday morning, with probably 600 liters of purified water leaking from another point. Water had also leaked at other facilities within the complex, the Nikkei added.

However, the Nikkei newspaper quoted Tepco Monday as saying that it believed no water had escaped into the sea.

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