Editer l'article Suivre ce blog Administration + Créer mon blog
Le blog de fukushima-is-still-news

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

Rokkasho: 14 years of faked safety checks

October 12, 2017

Japan Nuclear Fuel skipped safety checks at Rokkasho plant for 14 years






Nuclear regulators concluded Wednesday that Japan Nuclear Fuel Ltd. violated legally binding safety rules by failing to conduct necessary checks for over a decade at its uncompleted spent nuclear fuel reprocessing plant in the country’s northeast.


The failure of checks at an underground portion of the plant in the village of Rokkasho in Aomori Prefecture for about 14 years eventually resulted in about 800 liters of rainwater flowing into a building housing an emergency diesel generator in August this year. The generator is a crucial device in times of crisis such as the loss of external power.


Japan Nuclear Fuel President Kenji Kudo said at a Nuclear Regulation Authority’s meeting that he will prioritize inspections of all facilities at the plant and suspend its operations to seek a safety approval on the plant to put it on stream.


The utility plans to check its facilities and some 600,000 devices by the end of this year before requesting the authority to resume its safety assessment for the plant.


The body applied for a safety assessment of the plant in 2014 and aimed to complete it in the first half of fiscal 2018, but the goal is likely to be delayed due to the need for inspections.


The envisioned nuclear fuel reprocessing plant is a key component of the government’s nuclear fuel recycle policy, which aims to reprocess spent uranium and reuse extracted plutonium and uranium as reactor fuel.


But the Rokkasho plant has been inundated with problems, with its completion date postponed 23 times since 1997, its initial target. It also had to meet new, tougher safety standards made in the wake of the crisis at the Fukushima No. 1 nuclear power complex, triggered by the powerful March 2011 earthquake and tsunami that devastated parts of the Tohoku region.


The authority also said holes and cracks at exhaust pipes found at Japan Nuclear Fuel’s uranium enrichment plant in September also violated safety rules. The defects had been undetected due to a lack of inspections.


A utility compiles safety programs, which need to be assessed and approved by the authority.

If any grave flaws are found, the authority can issue an order to stop the operation of the plants or retract its approval to construct a nuclear plant.


Japan Nuclear Fuel “should have a substantial sense of crisis,” a member of the authority said. “We will take necessary measures if an improvement is not seen in ensuring the safety (in operating the plant).”



October 11, 2017


Unfinished nuclear fuel reprocessing plant faked safety records: NRA




The firm that owns an uncompleted nuclear fuel reprocessing plant in Aomori Prefecture failed to conduct necessary checks and falsified safety check records relating to the plant, the Nuclear Regulation Authority (NRA) has reported. The NRA concluded on Oct. 11 that Japan Nuclear Fuel Ltd. (JNFL) has violated safety measures after it was learned that the firm failed to carry out the required checks and nevertheless continued to write down "no abnormalities" in safety check records. There has been a spate of incidents such as the flow of rainwater into facility buildings at the plant in the Aomori Prefecture village of Rokkasho.


The plant, which is scheduled to reprocess spent nuclear fuel, was on the verge of hosting a final-stage NRA safety inspection, but the checkup is likely to be postponed considerably as JNFL now has to prioritize in-house inspections of all facilities at the plant.


One of the main roles of a nuclear fuel reprocessing plant is the extraction of reusable uranium and plutonium from spent nuclear fuel, making it a key part of the nuclear fuel cycle. However, the Rokkasho plant has been riddled with problems, and its completion date has been postponed 23 times since the initial planned opening date of 1997. Currently, the plant is scheduled to be completed in the first half of fiscal 2018, but this could be difficult.


In August, it came to light that about 800 liters of rainwater had flowed into an emergency electrical power building at the plant. The cause was the leaking of rainwater from an underground facility. This facility, however, has never been checked since its construction in 2003. JNFL nevertheless gave it a false "no abnormalities" appraisal in its daily records. Furthermore, about 110 liters of rainwater also flowed into the underground facility in September.


Apparently, the firm has tried to clarify the issue by saying that, "The (no abnormalities) comment was referring to another underground facility nearby."


The company plans to complete safety checks at all its Rokkasho plant facilities within the year, and then submit the results to the NRA -- with the intention of inviting the NRA to resume safety inspections of the plant.

Partager cet article
Pour être informé des derniers articles, inscrivez vous :
Commenter cet article