The radiation leak in Japan immediately recalls memories of accidents at the Chernobyl, Ukraine, and Three Mile Island, US, power stations, and how it unfolds will be a critical test for international acceptance of nuclear energy.
The Fukushima incident, brought on by the biggest earthquake ever recorded in Japan, took a turn for the worse on Saturday after a blast blew the roof off the facility.
There are direct comparisons with the 1979 disaster at Three Mile Island in the US — in both cases a cooling fault led to a buildup of pressure in the radioactive core and resulted in a relatively small radiation leak.
Both use water to control the temperature as uranium degrades in a nuclear chain reaction at the reactors’ core, creating steam which drives a turbine to generate electricity.
The stricken Japanese reactor north of Tokyo has little parallel, however, with the Soviet plant at Chernobyl, where fundamental design faults led to a deadly series of explosions in 1986, causing hundreds of deaths among emergency workers and contamination across Ukraine and beyond throughout Europe.
Japan’s nuclear agency said the problem at Fukushima rated a four on a seven-point scale of gravity, less severe than Three Mile Island, which was a 5, and well short of Chernobyl, a full 7.
In Japan, the earthquake and possibly the following tsunami overwhelmed mains and back-up power to the coolant pumps.
At Three Mile Island in Pennsylvania, human and technical error caused a confused response to a similar failure, leading to over-heating, a meltdown of the nuclear core and a write-off of the reactor. However, unlike in Chernobyl, there was no breach of a pressure vessel, the shell which insulates the heart of a reactor, nor any major radiation leak.
Comparing the problems at Fukushima with Three Mile Island, Robin Grimes, director of the Centre of Nuclear Engineering at Imperial College London, said: “There are parallel situations in terms of some of the processes that have occurred, but not parallel because in one case it was due to the safety processes in place and in this case it was natural disaster.”
In addition, he said, there was no evidence that the core at Fukushima had melted, as happened at Three Mile Island.
That would, if it happened, lead to a greater buildup of radiation within the pressure vessel. Nor was there any sign yet that inner protective shields were damaged, Grimes said.
He said an increase in radiation in the surrounding area of eight times the normal, natural level was an indication that damage to the reactor was limited so far.
The plants at Fukushima and Three Mile Island use water cooling technology in common with most nuclear reactors. Their use of water is slightly different, however.
The Japanese reactor applies heat from the nuclear reactions in the fuel rods directly to water, creating steam which drives an electricity-generating turbine. At Three Mile Island, water under pressure transfers heat to a separate system in a less direct process for producing steam.
In Chernobyl, in a safety check gone wrong, the operators deliberately prevented a shutdown of the reactor in a rapidly escalating fiasco. Runaway nuclear fission reactions created a buildup of pressure and a massive and deadly radiation leakage as explosions ripped through a too-feeble reactor shell.
Three Mile Island did not result in a serious leak, but was still damaging at the time for the reputation of nuclear power.
The Fukushima reactor dates to the early 1970s, older than many still in use, and the industry has since developed “even safer” reactors better equipped to cool naturally, Grimes said.
Opponents of nuclear power have been swift to use the problems at Fukushima to reinforce arguments that the hazards of atomic energy outweigh the benefits.
Supporters say that the ability of Japan’s dozens of reactors to survive frequent earthquakes shows their worth, particularly to countries like Japan, which lack their own reserves of oil, gas and coal.
“We must remember that there are 55 reactors in Japan and this was a huge earthquake,” said Paddy Regan, professor of Nuclear Physics at the University of Surrey near London. “As a test of the resilience and robustness of nuclear plants, it seems they have withstood the effects very well.”
LANDMARK CASE: ‘Every night we were dragged to US soldiers and sexually abused. Every week we were forced to undergo venereal disease tests,’ a victim said More than 100 South Korean women who were forced to work as prostitutes for US soldiers stationed in the country have filed a landmark lawsuit accusing Washington of abuse, their lawyers said yesterday. Historians and activists say tens of thousands of South Korean women worked for state-sanctioned brothels from the 1950s to 1980s, serving US troops stationed in country to protect the South from North Korea. In 2022, South Korea’s top court ruled that the government had illegally “established, managed and operated” such brothels for the US military, ordering it to pay about 120 plaintiffs compensation. Last week, 117 victims
China on Monday announced its first ever sanctions against an individual Japanese lawmaker, targeting China-born Hei Seki for “spreading fallacies” on issues such as Taiwan, Hong Kong and disputed islands, prompting a protest from Tokyo. Beijing has an ongoing spat with Tokyo over islands in the East China Sea claimed by both countries, and considers foreign criticism on sensitive political topics to be acts of interference. Seki, a naturalised Japanese citizen, “spread false information, colluded with Japanese anti-China forces, and wantonly attacked and smeared China”, foreign ministry spokesman Lin Jian told reporters on Monday. “For his own selfish interests, (Seki)
Argentine President Javier Milei on Sunday vowed to “accelerate” his libertarian reforms after a crushing defeat in Buenos Aires provincial elections. The 54-year-old economist has slashed public spending, dismissed tens of thousands of public employees and led a major deregulation drive since taking office in December 2023. He acknowledged his party’s “clear defeat” by the center-left Peronist movement in the elections to the legislature of Buenos Aires province, the country’s economic powerhouse. A deflated-sounding Milei admitted to unspecified “mistakes” which he vowed to “correct,” but said he would not be swayed “one millimeter” from his reform agenda. “We will deepen and accelerate it,” he
‘HYANGDO’: A South Korean lawmaker said there was no credible evidence to support rumors that Kim Jong-un has a son with a disability or who is studying abroad South Korea’s spy agency yesterday said that North Korean leader Kim Jong-un’s daughter, Kim Ju-ae, who last week accompanied him on a high-profile visit to Beijing, is understood to be his recognized successor. The teenager drew global attention when she made her first official overseas trip with her father, as he met with Chinese President Xi Jinping (習近平) and Russian President Vladimir Putin. Analysts have long seen her as Kim’s likely successor, although some have suggested she has an older brother who is being secretly groomed as the next leader. The South Korean National Intelligence Service (NIS) “assesses that she [Kim Ju-ae]
RSS