The operator of Japan's troubled nuclear plant said on Sunday it would not need to release more radiation as the pressure level in a reactor containment vessel has stabilized.
Tokyo Electric Power Corp (TEPCO), the operator of the plant in Fukushima, said it would not need to relieve the pressure of the containment vessel at reactor 3 at the plant, damaged by the March 11 earthquake and tsunami that rocked the region.
Meanwhile, 11 Japanese military fire trucks showered tonnes of water onto overheating reactor 4 for about one hour earlier in the day, the fourth day of the operation, in hopes of averting a potential meltdown.
It was the first time reactor number 4 has been sprayed since the disasters hit the region.
Overnight, a Tokyo fire department truck also spent more than 13 hours spraying water at the fuel storage pool at reactor number 3. The truck had originally been scheduled to spray water for seven hours.
More than 2,000 tons of water was believed to have been used when the spraying ended at 3.40am local time on Saturday.
The fire department truck was due to douse reactor 3 at the six-reactor complex later Sunday, while reactor 4 was to be doused by military trucks again.
Meanwhile, TEPCO said the company was to restore electricity to the buildings of reactors 1 and 2 as early as later Sunday to reactivate the cooling system for their spent fuel pools. But it would be difficult to restore electricity to reactor 2 Sunday, Jiji Press reported, citing TEPCO.
Spinach with high levels of radioactive iodine was found in Ibaraki while it was detected in milk the neighbouring prefecture of Fukushima. But the government said such levels would not pose an "immediate" health risk.
Radiation was also detected in tap water in Tokyo and neighbouring prefectures but that was within acceptable levels, the government said.
Tokyo told Ibaraki farmers to refrain from shipping spinach in the prefecture.
The government will decide by Monday whether it needs to regulate farm products near the Fukushima nuclear power plant, chief cabinet secretary Yukio Edano told a news conference.