Japan’s death toll soars as officials warn of possible 2nd explosion at nuclear plant

Posted March 12, 2011, at 5:47 a.m.
Last modified March 13, 2011, at 10:24 p.m.
In this photo released by Tokyo Power Electric Co., the Fukushima Daiichi power plant's Unit 1 is seen after an explosion in Okumamachi, Fukushima prefecture, Japan, Saturday, March 12, 2011. The explosion at the nuclear power station Saturday destroyed the building housing the reactor amid fears that it was close to a disastrous meltdown after being hit by Friday's powerful earthquake and tsunami.
Tokyo Power Electric Co. | AP
In this photo released by Tokyo Power Electric Co., the Fukushima Daiichi power plant's Unit 1 is seen after an explosion in Okumamachi, Fukushima prefecture, Japan, Saturday, March 12, 2011. The explosion at the nuclear power station Saturday destroyed the building housing the reactor amid fears that it was close to a disastrous meltdown after being hit by Friday's powerful earthquake and tsunami.
A resident is rescued from debris in Natori, Miyagi, northern Japan Saturday, after one of the country's strongest earthquakes ever recorded hit its eastern coast on Friday.
Noboru Tomura | AP
A resident is rescued from debris in Natori, Miyagi, northern Japan Saturday, after one of the country's strongest earthquakes ever recorded hit its eastern coast on Friday.
U.S. Navy, sailors aboard the U.S. 7th Fleet command ship USS Blue Ridge (LCC 19) in the South China Sea stand-by to move pallets of humanitarian relief supplies across the ship's flight deck during an underway replenishment with the Military Sealift Command fleet replenishment oiler USNS Rappahannock (T-AO 204), not pictured. Blue Ridge is ensuring the crew is ready if directed to assist with earthquake and tsunami relief operations in Japan.
MC3 Fidel C. Hart | AP
U.S. Navy, sailors aboard the U.S. 7th Fleet command ship USS Blue Ridge (LCC 19) in the South China Sea stand-by to move pallets of humanitarian relief supplies across the ship's flight deck during an underway replenishment with the Military Sealift Command fleet replenishment oiler USNS Rappahannock (T-AO 204), not pictured. Blue Ridge is ensuring the crew is ready if directed to assist with earthquake and tsunami relief operations in Japan.
Local residents form a long line at a water station set up at a park at Koriyama, northeastern Japan, on Saturday, one day after a giant quake and tsunami struck the country's northeastern coast.
Kyodo News | AP
Local residents form a long line at a water station set up at a park at Koriyama, northeastern Japan, on Saturday, one day after a giant quake and tsunami struck the country's northeastern coast.
A resident looks at a message board at an evacuation center in Ofunato, Iwate prefecture, Saturday, a day after one of Japan's strongest earthquakes ever recorded hit the country's east coast.
Kyodo News | AP
A resident looks at a message board at an evacuation center in Ofunato, Iwate prefecture, Saturday, a day after one of Japan's strongest earthquakes ever recorded hit the country's east coast.
People who were isolated at an elementary school, head for safety place in Sendai, northern Japan Saturday after one of the country's strongest earthquakes ever recorded hit its eastern coast on Friday.
Shiro Nishihata | AP
People who were isolated at an elementary school, head for safety place in Sendai, northern Japan Saturday after one of the country's strongest earthquakes ever recorded hit its eastern coast on Friday.
U.S. Navy, sailors aboard the U.S. 7th Fleet command ship USS Blue Ridge (LCC 19) in the South China Sea move pallets of humanitarian relief supplies across the ship's flight deck during an underway replenishment with the Military Sealift Command fleet replenishment oiler USNS Rappahannock (T-AO 204), not pictured. Blue Ridge is ensuring the crew is ready if directed to assist with earthquake and tsunami relief operations in Japan.
MC3 Fidel C. Hart | AP
U.S. Navy, sailors aboard the U.S. 7th Fleet command ship USS Blue Ridge (LCC 19) in the South China Sea move pallets of humanitarian relief supplies across the ship's flight deck during an underway replenishment with the Military Sealift Command fleet replenishment oiler USNS Rappahannock (T-AO 204), not pictured. Blue Ridge is ensuring the crew is ready if directed to assist with earthquake and tsunami relief operations in Japan.
Smoke rises from burning homes in Yamadamachi, Iwate prefecture.
YOMIURI SHIMBUN | AP
Smoke rises from burning homes in Yamadamachi, Iwate prefecture.
A large ship sits among rubble after it was swept by a tsunami to the city center of Kesennuma, northeastern Japan, on Saturday March 12, 2011, one day after a giant quake and tsunami struck the country's northeastern coast.
KYODO NEWS | AP
A large ship sits among rubble after it was swept by a tsunami to the city center of Kesennuma, northeastern Japan, on Saturday March 12, 2011, one day after a giant quake and tsunami struck the country's northeastern coast.
Landslide covers train tracks near Echigotanaka Station in Niigata prefecture (states), Japan, Saturday, March 12, 2011, a day after one of the country's strongest earthquakes ever recorded hit its eastern coast.
KYODO NEWS | AP
Landslide covers train tracks near Echigotanaka Station in Niigata prefecture (states), Japan, Saturday, March 12, 2011, a day after one of the country's strongest earthquakes ever recorded hit its eastern coast.
Smoke rises from the Fukushima nuclear power plant in Japan Saturday after an explosion at one of its buildings.
AP
Smoke rises from the Fukushima nuclear power plant in Japan Saturday after an explosion at one of its buildings.
In these combined images made from Japan's NHK television, the Fukushima Daiichi power plant's Unit 1 is seen before (top) and after (bottom) an explosion in Okumamachi, Fukushima prefecture, Japan, Saturday, March 12, 2011. The walls of the building at the nuclear power station crumbled Saturday as smoke poured out and Japanese officials said they feared the reactor could melt down following the failure of its cooling system in a powerful earthquake and tsunami.
AP
In these combined images made from Japan's NHK television, the Fukushima Daiichi power plant's Unit 1 is seen before (top) and after (bottom) an explosion in Okumamachi, Fukushima prefecture, Japan, Saturday, March 12, 2011. The walls of the building at the nuclear power station crumbled Saturday as smoke poured out and Japanese officials said they feared the reactor could melt down following the failure of its cooling system in a powerful earthquake and tsunami.
Houses are in flame while the Natori river is flooded over the surrounding area by tsunami tidal waves in Natori city, Miyagi Prefecture, northern Japan, March 11, 2011, after strong earthquakes hit the area.
YOMIURI SHIMBUN | AP
Houses are in flame while the Natori river is flooded over the surrounding area by tsunami tidal waves in Natori city, Miyagi Prefecture, northern Japan, March 11, 2011, after strong earthquakes hit the area.
A firefighter looks at burned-out vehicles at Hitachi port, northeastern Japan, on Saturday March 12, 2011, one day after a giant quake and tsunami struck the country's northeastern coast.
KYODO NEWS | AP
A firefighter looks at burned-out vehicles at Hitachi port, northeastern Japan, on Saturday March 12, 2011, one day after a giant quake and tsunami struck the country's northeastern coast.
A man snaps a picture of the aftermath of tsunami following Friday's massive tsunami triggered by a powerful earthquake in Sendai, Miyagi prefecture, northern Japan, Saturday, March 12, 2011.
JUNJI KUROKAWA | AP
A man snaps a picture of the aftermath of tsunami following Friday's massive tsunami triggered by a powerful earthquake in Sendai, Miyagi prefecture, northern Japan, Saturday, March 12, 2011.
A woman, carrying a child on her back, walks over tsunami-drifted debris and mud in Rikuzentakada, Iwate Prefecture, Saturday morning, March 12, 2011 after Japan's biggest recorded earthquake slammed into its eastern coast Friday.
KYODO NEWS | AP
A woman, carrying a child on her back, walks over tsunami-drifted debris and mud in Rikuzentakada, Iwate Prefecture, Saturday morning, March 12, 2011 after Japan's biggest recorded earthquake slammed into its eastern coast Friday.
Cars of a train lie overturned in Shinchi town, Fukushima prefecture, Saturday, March 12, 2011 after being washed away by an earthquake-triggered tsunami.
KYODO NEWS | AP
Cars of a train lie overturned in Shinchi town, Fukushima prefecture, Saturday, March 12, 2011 after being washed away by an earthquake-triggered tsunami.

KORIYAMA, Japan — Japanese officials warned of a possible second explosion at a nuclear plant crippled by the earthquake and tsunami as they raced to stave off multiple reactor meltdowns, but they provided few details about whether they were making progress. More than 180,000 people have evacuated the area, and up to 160 may have been exposed to radiation.

Four nuclear plants in northeastern Japan have reported damage, but the danger Monday appeared to be greatest at the Fukushima Dai-ichi nuclear complex, where one explosion occurred over the weekend and a second was feared. Operators have lost the ability to cool three reactors at Dai-ichi and three more at another nearby complex using usual procedures, after the quake knocked out power and the tsunami swamped backup generators.

Chief Cabinet Secretary Yukio Edano said Sunday that a hydrogen explosion could occur at Dai-ichi’s Unit 3, the latest reactor to face a possible meltdown. That would follow a hydrogen blast Saturday in the plant’s Unit 1.

“At the risk of raising further public concern, we cannot rule out the possibility of an explosion,” Edano said. “If there is an explosion, however, there would be no significant impact on human health.”

Operators have been dumping seawater into units 1 and 3 in a last-ditch measure to cool the reactors. They were getting water into the other four reactors with cooling problems without resorting to corrosive sea water, which likely makes the reactors unusable.

Edano said residents within about 12 miles of the Dai-ichi plant were ordered to evacuate as a precaution, and the radioactivity released into the environment so far was so small it didn’t pose any health threats.

Such statements, though, did little to ease public worries.

“First I was worried about the quake,” said Kenji Koshiba, a construction worker who lives near the plant. “Now I’m worried about radiation.” He spoke at an emergency center in Koriyama, about 40 miles from the most troubled reactors and 125 miles north of Tokyo.

A higher than usual level of radiation was detected at the Dai-ichi plant Monday, after levels rose and dropped in previous days. Naoki Kumagai, an official at Japan’s nuclear safety agency, told the Associated Press that a person at the monitoring site for an hour would get as much radiation as a plant worker typically gets in six months, but added that the levels would be much higher o f one of the reactors were on the verge of a meltdown.

The radiation was detected on the grounds, and Unit 1 was the closest reactor, but it was unclear whether that was where the radiation came from, said agency official Yoshihiro Sugiyama.

At the makeshift center set up in a gym, a steady flow of people — mostly the elderly, schoolchildren and families with babies — were met by officials wearing helmets, surgical masks and goggles.

About 1,500 people had been scanned for radiation exposure, officials said.

Up to 160 people, including 60 elderly patients and medical staff who had been waiting for evacuation in the nearby town of Futabe, and 100 others evacuating by bus, might have been exposed to radiation, said Ryo Miyake, a spokesman from Japan’s nuclear agency. It was unclear whether any cases of exposure had reached dangerous levels.

Edano said none of the Fukushima Dai-ichi reactors was near the point of complete meltdown, and he was confident of escaping the worst scenarios.

Officials, though, have declared states of emergency at the six reactors where cooling systems were down — three at Dai-ichi and three at the nearby Fukushima Daini complex. The U.N. nuclear agency said a state of emergency was also declared Sunday at another complex, the Onagawa power plant, after higher-than-permitted levels of radiation were measured there. It said Japan informed it t hat all three reactors there were under control.

A pump for the cooling system at yet another nuclear complex, the Tokai Dai-Ni plant, also failed after Friday’s quake but a second pump operated normally as did the reactor, said the utility, the Japan Atomic Power Co. It did not explain why it did not announce the incident until Sunday.

Edano denied there had been a meltdown in the Fukushima Dai-ichi complex, but other officials said the situation was not so clear.

Hidehiko Nishiyama, a senior official of the Economy, Trade and Industry Ministry, indicated the reactor core in Unit 3 had melted partially. He said at a news conference, “I don’t think the fuel rods themselves have been spared damage,” according to the Kyodo News agency.

A complete meltdown — the melting of the radioactive core — could release uranium and dangerous contaminants into the environment and pose major, widespread health risks.

The steel reactor vessel could melt or break from the heat and pressure. A concrete platform underneath the reactor is supposed to catch the molten metal and nuclear fuel, but the intensely hot material could set off a massive explosion if water has collected on the platform. Radioactive material also could be released into the ground if the platform fails.

The explosion that destroyed the walls and ceiling of Dai-ichi Unit 1’s containment building was much less serious that a meltdown would be — in fact, it was operators’ efforts to avoid a meltdown that caused it.

Officials vented steam from the reactor to reduce pressure, and were aware that there was an explosion risk because the steam contained hydrogen, said Shinji Kinjo, spokesman for the government’s Nuclear and Industrial Safety Agency. The explosion occurred when hydrogen reacted with oxygen outside the reactor.

It is unclear how far the impact of a meltdown might reach. In the United States, local communities plan for evacuation typically within 10 miles of a nuclear plant. However, states must be ready to cope with contamination of food and water as far as 50 miles away. Radioactivity can also be carried to faraway places by the winds, as it was in the 1986 Chernobyl disaster, though it will become increasingly diffuse. Acute radiation deaths would normally be expected only much closer to the plant.

The reactor that exploded at Chernobyl, sending a cloud of radiation over much of Europe, was not housed in a sealed container as those at Dai-ichi are. The Japanese reactors also do not use graphite, which burned for several days at Chernobyl.

Japan’s nuclear crisis was triggered by twin disasters on Friday, when an 8.9-magnitude earthquake, the most powerful in the country’s recorded history, was followed by a tsunami that savaged its northeastern coast with breathtaking speed and power.

Nearly 1,600 people were confirmed dead and hundreds more were missing, according to officials, but police in one of the worst-hit areas estimated the toll there alone was more than 10,000.

All of the reactors in the region shut down automatically when the earthquake hit. But with backup power supplies also failing, shutting down the reactors is just the beginning of the problem, scientists said.

“You need to get rid of the heat,” said Friedrich Steinhaeusler, a professor of physics and biophysics at Salzburg University and an adviser to the Austrian government on nuclear issues. “You are basically putting the lid down on a pot that is boiling.”

“They have a window of opportunity where they can do a lot,” he said, such as using sea water as an emergency coolant. But if the heat is not brought down, the cascading problems can eventually be impossible to control. “This isn’t something that will happen in a few hours. It’s days.”

Japan’s nuclear safety agency said 1,450 workers were at the Dai-ichi plant on Sunday, its usual staffing. The workers were in protective gear and were taking shorter turns than usual in units 1 and 3 to limit their exposure, said agency spokesman Sugiyama.

The emergencies at the nuclear plants have led to an electricity shortage in Japan, where nearly 2 million households were without power Sunday. Starting Monday, power will be rationed with rolling blackouts in several cities, including Tokyo.

Japan has a total of 55 reactors spread across 17 complexes nationwide.

Yamaguchi reported from Tokyo. Associated Press writers Tomoko A. Hosaka and Yuri Kageyama in Tokyo, Tim Sullivan in Bangkok and Jeff Donn in Boston contributed to this report.

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