Some experts say restarting the reactor may lead to disaester
This month South Korea will flip the switch on a very aged nuclear reactor. South Korean officials say their hands are tied and that the reactor must be brought back online. But some experts wonder whether South Korea is flipping the switch on a stable reactor or on a ticking time bomb.
I. Déjà vu? Aged Reactor's Backup Generator Fails
Nuclear power is incredibly vital to the economy of South Korea, the world's fifteenth largest economy. Overall, 29.2 percent of Korea's power generation capacity and 45 percent of its total electrical consumption are provided from nuclear sources. That puts the nation in the company of only a handful of other countries, like France, which draw such a large part of their electrical load from splitting the atom.
Much of South Korea's reliance on the alternative power technology is bred out of necessity. South Korea's has virtually no fossil fuel resources and thus is forced to import from foreign regions at a high cost.
South Korea is known for pushing the boundaries of modern reactor design with very-safe next generation designs, such as high temperature reactors that co-generate hydrogen, small modular reactors, and even a liquid-metal fast-breeder reactor. The Kori-1 reactor is not one of those modern designs.
Located near South Korea's southeastern coast, the reactor first achieved criticality in 1978 and has been generating power ever since.
The nuclear reactor near Busan is locate approximately 140 miles from Hiroshima, Japan.
[Image Source: Google Maps]
The reactor, situated near the city of Busan, came under substantial scrutiny in March. It was revealed that a routine maintenance operation in February had led to a loss of power of both the reactor and the emergency reactor, leading to a rise in pressured water coolant's temperatures.
The outage lasted only 12 minutes, but coupled with the failure of the backup diesel generator it was enough to prompt Korea’s Nuclear Safety and Security Commission (NSSC) to order the operator -- Korea Hydro and Nuclear Power (KHNP) -- to shutter the reactor pending a full safety review.
That review was accompanied by an international review by experts at the International Atomic Energy Agency (IAEA). The IAEA's senior engineering panel in June said it was safe to restart the reactor, but scolded KHNP for neglecting to improve safety after the incident (namely, KHNP failed to replace the faulty backup generator). On July 4 the reactor restart was approved by Korea's NSSC.
II. Foreign Expert, Locals Fight the Reactor Restart
Local residents and activists took the news very badly.
But their cries of protest led only to a delay of the restart. At a July 26 press conference, Sukwoo Hong, the minister of knowledge economy, announced, "We keep talking with residents but reaching a consensus is expected to take time. There is no choice but to restart the operation of the Kori-1 reactor on 3 August at the latest."
The restart marks the latest extension for a reactor that was expected to be closed in 2007, when it finished its 30th year in operation. Its life was previously extended by a 2008 IAEA review, which allowed it to continue to operate for another 10 years.
The Kori-1 reactor has been approved to restart, but some fear it could fail again.
[Image Source: World Nuclear News]
On the eve of the restart South Korea is receiving a stern warning from a neighbor which is one of its few international equals in terms of nuclear power use -- Japan. Hiromitsu Ino, an emeritus professor of materials science at the University of Tokyo, has made waves claiming the weld material in the pressure vessel has been compromised. He warns, "Any 50 nuclear power plants in Japan are much better than Kori-1."
Professor Hiromitsu fears that Kori-1 could become the site of only the third major nuclear disaster in history, etched in the culture space as the name of a reactor in his homeland has been -- Fukushima.
III. There's Nothing to Fear, Say Korean Officials
Indeed, the reports of operator negligence and the failure of the backup generator at Kori-1 is eerily familiar to the failure that allowed the meltdown at Fukushima. But Korean regulators and the KHNP claim that the reactor is perfectly safe.
Il Soon Hwang, a nuclear scientist at Seoul National University, argues that the only real issue is that the government hasn't been properly communicating with citizens what has occurred. He rebuts Professor Hiromitsu's analysis, saying the welds on the reactor are safe. He comments, "The most serious issue is that staff in the control room decided not to report the more than ten minutes of blackout and tried to hide this accident."
South Korea insists that the reactor welds were not compromised by February's overheating.
(CORRECTION: as a reader noted, the original picture was from a BWR, not a PWR, this was an error.)
[Image Source: Wikimedia Commons]
The restart is a tricky gamble. On the one hand, the power the reactor produces is vital to the economy and failure to restart could surrender ground to anti-nuclear advocates who baffingly want to shut down far safer and cleaner designs as well.
Conversely, restarting could mean flirting with disaster a scenario which could greatly damage the reputation of nuclear power in South Korea as the Fukushima did in Professor Hiromitsu's home country.
The controversy comes as South Korea's hostile northern neighbor contemplates a nuclear future of its own, despite internation condemnation.
Source: Nature
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