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information about Fukushima published in English in Japanese media info publiée en anglais dans la presse japonaise

Oi reactors to stay online

June 21, 2013

Ohi reactors likely to remain online beyond July



Japan's Nuclear Regulation Authority will allow the country's only 2 running reactors to stay online after new nuclear safety guidelines take effect in July.

The guidelines for the first time oblige utilities to beef up measures against serious accidents like the one that occurred in Fukushima 2 years ago.

The authority submitted a draft report on its safety assessment of the No. 3 and No. 4 reactors at the Ohi plant in Fukui Prefecture to a panel meeting on Thursday.

The report says the reactors will not be seriously affected even by a maximum-intensity earthquake. But it added the reservation that geological strata underneath the site are not fully known.

It also urges the utility to improve some emergency measures including the on-site emergency response facility.

But the report ultimately concludes that the 2 reactors operated by Kansai Electric Power Company are unlikely to immediately cause a serious safety problem.

The NRA plans to compile a final report after talking to Kansai Electric at a meeting scheduled for next Monday.

With that judgment, the Ohi reactors are expected to remain working until September, when they go offline for mandatory checks.

But the nuclear regulator criticized the utility for being stingy with information on the safety measures. The authority said that such an attitude could hamper it from carrying out its screening effectively.

Jun. 20, 2013 - Updated 11:06 UTC


NRA eyes allowing Japan’s two operating reactors to remain online through September



The two nuclear reactors currently in operation in Japan have no serious safety problems in light of new regulations taking effect in July, regulators said in a draft assessment report released Thursday.

The assessment, if finalized by the Nuclear Regulation Authority, will enable reactors 3 and 4 at Kansai Electric Power Co.’s Oi plant in Fukui Prefecture to remain online through September, when they will be taken offline for mandatory routine checks.

“As of the end of June, we think . . . the situation will not create serious safety problems immediately,” the NRA said in the report, which evaluated the current status of the reactors.

But the NRA noted that some requirements have not been fully satisfied and criticized Kepco for its attitude in exchanges with the regulators during the latest assessment process.

“There were some areas in which Kansai Electric proposed countermeasures bit by bit as if to find the minimum possible standard. Such an approach is likely to be an obstacle in efficiently proceeding with (reactor safety) assessments once the new regulations are implemented,” the report said.

Reactors that are currently offline will have to be checked by the NRA to determine whether they meet the new safety regulations and can be restarted. The NRA is expected to start accepting applications for the safety screening from July 8.

But the NRA decided to conduct a special assessment on the safety of the Oi plant’s reactors 3 and 4 before the regulations take effect, given that they are the only operating reactors in Japan out of a total of 50.

The new regulations, which reflect the lessons learned from the 2011 Fukushima No. 1 nuclear power plant disaster, require utilities to take specific measures to protect their atomic plants from tsunami and to prevent and minimize the consequences of severe crises, such as meltdowns.

As for emergency command centers that the utilities must establish to handle severe crises, Kepco decided to use a meeting room next to a central control room for reactors 1 and 2 at the Oi plant.

The NRA acknowledged in the draft report that the room is big enough to house supervisors who would be expected to stay there, but also urged the utility to quickly finish construction of a seismically isolated building to further improve safety.

NRA gives pass to 2 Oi nuke reactors as showdown looms on tougher standards









By allowing the continued operation of two reactors at the Oi nuclear power plant until September, the Nuclear Regulation Authority signaled the difficulties it faces in forcing utilities to abide by what it calls the "world's most stringent" safety standards for the nuclear industry.

The nuclear watchdog concluded at a June 20 meeting that it found “no problem immediately posing serious threat to the safety” of the Oi facilities during provisional checks it has been conducting since April, and will allow them to continue operating until they are shut down in September for routine inspections.

The decision allows Kansai Electric Power Co.'s No. 3 and No. 4 Oi reactors to stay online this summer without having to pass the new tougher safety standards, although the NRA expressed frustration with the utility's cooperation. This frustration reveals the potential tug of war the NRA faces in coming years in dealing with plant operators.

Of Japan's 50 nuclear reactors, the Nos. 3 and 4 Oi reactors are the only ones currently online. The two were reactivated last July as the nation's first to do so after the 2011 Fukushima nuclear accident.

The approval was not a surprising one, as the NRA was set from the outset to let the Oi reactors operate until September unless they were found to have serious problems, despite the nuclear watchdog's policy that requires all reactors to meet new safety guidelines before they are restarted.

The guidelines, which will go into effect in July, were drawn up to legally require operators of nuclear power plants to be prepared for a severe accident, such as the one at the Fukushima No. 1 nuclear power plant operated by Tokyo Electric Power Co.

Before the March 2011 triple meltdown following the Great East Japan Earthquake and tsunami at the Fukushima plant, the previous guidelines did not envision a disaster of such magnitude.

All reactors are expected to clear NRA examinations to assess if they meet its new safety guidelines before they are allowed to go back online.

According to experts, the NRA gave the green light to the continued operation of the Oi reactors after "less-than-strenuous" provisional checks partly because it did not have time to conduct detailed studies.

For example, the NRA put off determining if an active seismic fault runs beneath the plant site. Some members of the panel of experts with the NRA pointed out that on-site studies indicated the presence of an active fault under a key facility.

The NRA, however, decided to delay its final assessment because Kansai Electric, which disputes the panel's view, has not finished its own study and the NRA panel was not unanimous in its evaluation.

The NRA also had to accept a sketchy study of the geological structure beneath the plant site and surrounding area, which is necessary to determine the impact of an anticipated quake.

NRA investigators plan to embark on an extensive check of the geological structure when Kansai Electric applies for restarts of the Oi reactors.

The provisional checks also revealed the utility’s reluctance to cooperate with the NRA.

The NRA ordered the utility to determine the size of an expected temblor on the assumption that three active faults in the plant’s vicinity will shift at the same time. But it took the company about a month to agree to the simulation.

The NRA criticized Kansai Electric in a June 20 draft report that said the company “looked as if it were trying to find the lowest possible bar to clear the new safety standards by proposing safeguard measures by piecemeal.”

In an apparent warning to other utilities, the NRA said such an approach would “become an impediment to efficiently conducting inspections.”

Other regional utilities have been closely observing Kansai Electric's cooperation with the NRA during the provisional checks as reference for when they apply for restarts of their reactors in July and later.

The NRA will begin its checks of reactors under the new safety guidelines starting July 8.

Shunichi Tanaka, NRA chairman, said the new standards released June 19, are the “world’s most stringent, as was planned.”

But he also acknowledged for the guidelines to be truly effective hinges on how strenuous the NRA’s examinations will be in line with the new regulations.

Tanaka has sent mixed signals to utilities eager to bring idled reactors back online due to ballooning fossil fuel costs, saying the NRA’s top priority is the safety of reactors, not the bottom lines of the operators, and emphasizing speedy and efficient examinations.

Four electric power companies are expected to apply for restarts of their 12 reactors right after the new guidelines take effect on July 8.

They are the Nos. 1-3 reactors at the Tomari plant in Hokkaido, operated by Hokkaido Electric Power Co.; the Nos. 3-4 reactors at the Oi plant, and the Nos. 3-4 reactors at the Takahama plant, both in Fukui Prefecture, of Kansai Electric; the No. 3 reactor at the Ikata plant in Ehime Prefecture of Shikoku Electric Power Co.; and the Nos. 3-4 reactors at the Genkai plant in Saga Prefecture and the Nos. 1-2 reactors at the Sendai plant in Kagoshima Prefecture of Kyushu Electric Power Co.

All these reactors are the pressurized-water type, different from the Fukushima No. 1 plant.

They are expected to get easy approval from the NRA because they have a five-year moratorium on the installation of the required filtered containment vessel venting system.

Other utilities--Tohoku Electric Power Co., TEPCO, Chubu Electric Power Co., Hokuriku Electric Power Co. and Chugoku Electric Power Co.--are likely to take more time to be ready for applying.

All their reactors are of the boiling water type that are required to be fitted with a filtered containment vessel venting system at the time of application for restarts.

When the Oi reactors are shut down for an inspection in September, the nation will have no reactors online for at least several months.

Experts say that it will be late this year or early next year at the earliest when the first reactor may be reactivated after passing the new safety standards.



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