nucleaire japonais

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Message par energy_isere » 29 avr. 2023, 11:24

Kansai seeks to extend lifetime for Takahama units

26 April 2023

Kansai Electric Power has asked Japan's Nuclear Regulation Authority (NRA) for permission to extend the lifespan of units 3 and 4 at its Takahama nuclear power plant by 20 years.

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Takahama (Image: Kansai)

Under regulations which came into force in July 2013, Japanese reactors have a nominal operating period of 40 years. One extension to this - limited to a maximum of 20 years - may be granted, requiring amongst other things, a special inspection to verify the integrity of reactor pressure vessels and containment vessels after 35 years of operation.

Kansai said it had carried out special inspections and evaluations of the two units, and not found any issues likely to cause problems if the operating period was to be extended to 60 years, saying that it had put together a facility management programme for the extended operation including the replacement of the steam generators. It added: "We will continue to strive to improve the safety and reliability of nuclear power plants and with the understanding of the local community and others we will utilise nuclear power generation as an important power source."

The Takahama plant, in Fukui prefecture, is home to four reactors. Takahama 1 and 2 - both 780 MWe (net) pressurised water reactors (PWRs) - entered commercial operation in 1974 and 1975 respectively, while units 3 and 4 - both 830 MWe PWRs - both began commercial operation in 1985. Takahama 1 and 2 became the first Japanese units to be granted a licence extension beyond 40 years under revised regulations, but are currently out of service pending the completion of a bunkered back-up control centre, as required by the regulator. Kansai has previously said it plans to restart units 1 and 2 in mid-2023.
https://www.world-nuclear-news.org/Arti ... hama-3-and

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Re: nucleaire japonais

Message par energy_isere » 29 juil. 2023, 11:31

Suite du post au dessus.
Redémarrage d'un 11iéme réacteurs au Japon.
Eleventh Japanese reactor resumes operation

28 July 2023

Unit 1 of the Takahama nuclear power plant in Japan's Fukui Prefecture has been restarted after being taken offline more than 12 years ago. Kansai Electric Power Company plans to return the 780 MWe (net) pressurised water reactor (PWR) to commercial operation at the end of August.

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The four-unit Takahama plant (Image: NRA)

Takahama 1 entered a regular inspection outage in January 2011, two months before the accident at the Fukushima Daiichi plant that resulted in all of Japan's operable reactors being taken offline. Unit 2 of the plant was taken offline in November 2011.

Kansai applied to the Nuclear Regulation Authority (NRA) to restart the two reactors in March 2015.

In April 2016, the NRA confirmed the units met new safety regulations. In December of that year, the NRA gave its approval for the reactors - which began operating in 1974 and 1975, respectively - to operate for up to 60 years, becoming the first Japanese units to be granted a licence extension beyond 40 years under the revised regulations.

Takahama 1 was originally scheduled to restart around early June, but the plan was postponed due to the need for additional work on fire protection infrastructure.

Kansai announced that Takahama 1 was restarted at 3.00pm on 28 July and expects the reactor to reach criticality on 29 July. Following various tests, the final stage of the periodic inspection will be carried out on 2 August. On 28 August, a comprehensive load performance test will be conducted and full-scale operation will be resumed. The next scheduled inspection of the reactor is in April 2024.

Takahama 2 is scheduled to resume operations on 15 September.

Takahama 3 and 4 - two 1180 MWe PWRs - were returned to commercial operation in February 2016 and June 2017, respectively. In April this year, Kansai asked the NRA for permission to extend the lifespan of Takahama units 3 and 4 - which both began commercial operation in 1985 - by 20 years.

The reviews of 17 reactors had been successfully completed and 11 of them have now returned to operation. The remaining 14 operable reactors are at various stages of the NRA review process, and several may be forced to shut down temporarily for not meeting NRA deadlines to construct back-up control centres or other facilities required by the new regulations.

In December last year, the Japanese government adopted a plan to extend the operation of existing nuclear power reactors and replace aging facilities with new advanced ones. The move is part of a policy that addresses global fuel shortages following Russia's invasion of Ukraine and seeks to achieve carbon neutrality by 2050.
https://www.world-nuclear-news.org/Arti ... -operation

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Re: nucleaire japonais

Message par energy_isere » 29 déc. 2023, 21:54

La plus grande centrale nucléaire de la planète va-t-elle redémarrer en 2024 ?

Samir Rahmoune 29 dec 2023

Le Japon réfléchit à la remise en service de l'immense centrale nucléaire de Kashiwazaki-Kariwa.

Après la catastrophe de Fukushima en 2011, le Japon avait décidé de sortir du nucléaire. Un choix qui s'était avéré financièrement douloureux, cette technologie assurant à l'époque près de 25% de la production d'électricité du pays, contre aujourd'hui 6%, obligeant le pays à accroître ses importations en énergie pour combler la différence. Mais Tokyo ne veut plus payer autant pour son approvisionnement en électricité, et se tourne à nouveau vers l'atome

Une centrale aux multiples problèmes

Le Japon pourrait bien être une des grands nations du nucléaire au XXIe siècle. Le pays a en effet inauguré au début du mois le plus grand Tokamak au monde, soit un réacteur dédié à la recherche sur la fusion nucléaire. Et ses efforts ne vont pas s'arrêter à la recherche, car le Pays du Soleil Levant veut aussi à nouveau utiliser la technologie pour produire de l'électricité.

Et dans ce domaine, il va se tourner vers la centrale de Kashiwazaki-Kariwa, située dans la préfecture de Niigata. L'Autorité de régulation nucléaire du pays vient en effet de lever son « ordre d'action corrective », qui empêchait depuis une décennie de transporter et de charger du combustible dans la centrale.

Il est à noter que le site avait subi plusieurs problèmes avant même l'incident de Fukushima. En 2007, il avait dû être l'objet de travaux de renforcement après un puissant séisme, alors qu'en 2002, la mise au jour de rapports de sécurité frauduleux avaient entraîné sa mise à l'arrêt.

Le Japon a besoin de l'énergie nucléaire

Pour autant, au vu des capacités du site, sa relance pourrait être un atout non négligeable pour le pays. Car la centrale de Kashiwazaki-Kariwa possède avec ses 7 réacteurs une puissance de 8,2 gigawatts, ce qui pourrait potentiellement pourvoir à la consommation de 16 millions de foyers. En activité, elle serait tout simplement la plus grande centrale au monde, devant la désormais très connue centrale ukrainienne de Zaporijjia.

Le Japon fait par ailleurs partie de la vingtaine de pays qui a suivi l'appel de la France lors de la Cop 28, appel qui demande de multiplier par trois la capacité de production nucléaire mondiale. Au niveau national, le Japon veut faire monter la part du nucléaire dans sa production d'électricité à 20 à 22% à l'horizon 2030.
https://www.msn.com/fr-fr/lifestyle/sho ... 5e08&ei=63

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Re: nucleaire japonais

Message par energy_isere » 13 janv. 2024, 20:39

suite de ce post du 11 novembre 2020 http://www.oleocene.org/phpBB3/viewtopi ... 0#p2311980
Onagawa 2 restart delayed by 'several months'
10 January 2024

Safety upgrade work at unit 2 of the Onagawa nuclear power plant in Japan's northeastern Miyagi Prefecture will not be completed next month, as previously planned, Tohoku Electric Power Company announced. The utility had earlier expected to resume commercial operation of the reactor around May.

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Tokohu's Onagawa plant (Image: Kurihalant Co Ltd)

Tohoku said that work to fireproof electric cables at the unit is taking longer than planned.

"Regarding fire protection work, since late August last year, we have been carrying out work mainly on wrapping electrical conduits with fireproof materials, but the work area is narrow due to equipment and scaffolding installed for other safety work," it said in a statement. "There were many problems, so we proceeded with the construction while changing the route of the conduit according to the site situation.

"Recently, it has been confirmed that the amount of construction work has increased due to confirmation work for changing the route of electrical conduits and completing fire protection measures work, and as a result, the construction period for fire protection measures work is expected to be delayed, so safety measures work will be carried out. We are currently re-examining the completion date."

Tohoku said it currently anticipates a delay of several months regarding the completion date of the safety measures.

The company applied to the Nuclear Regulation Authority (NRA) in December 2013 for a safety assessment of Onagawa 2 - a 796 MWe boiling water reactor (BWR) - to verify countermeasures applied at the plant meet new safety standards. In late November 2019, the NRA approved a draft screening document that concluded the upgraded plant will meet revised safety standards, introduced in January 2013. In February 2020, the NRA approved the final screening report, clearing the way for the unit to resume operation. Tohoku is required to complete the countermeasure upgrades and obtain the approval of local authorities before it will be able to restart Onagawa 2.

The Onagawa plant was the closest nuclear power plant to the epicentre of the earthquake and tsunami of 11 March 2011, but sustained far less damage than expected. The earthquake knocked out four of the plant's five external power lines, but the remaining line provided sufficient power for its three BWRs to be brought to cold shutdown. Onagawa 1 briefly suffered a fire in the non-nuclear turbine building. The plant was largely unaffected by the tsunami as it sits on an elevated embankment more than 14 metres above sea level, but the basement floors of unit 2 were flooded.
https://www.world-nuclear-news.org/Arti ... ral-months

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Re: nucleaire japonais

Message par energy_isere » 04 févr. 2024, 10:59

Japan adds uranium to critical minerals list

February 1, 2024

Japan has added uranium to its list of critical minerals in a move that seeks to reduce its dependence on foreign sources of nuclear element, particularly Russia’s, and to support domestic exploration and development projects.


The decision, made by the Ministry of Economy, Trade and Industry (METI), comes almost a year after the government of Prime Minister Fumio Kishida vowed to subsidize up to half the cost of mine development and smelting projects for lithium, manganese, nickel, cobalt, graphite and rare earths.

Japan is the world’s third-largest consumer of uranium, after the United States and China, but it has no domestic production and relies entirely on imports from countries such as Australia, Canada and Kazakhstan.

According to METI, Japan’s uranium reserves are estimated at 6,600 tonnes, which could meet internal demand for about six years.

Up until the Fukushima accident in 2011, Japan was generating some 30% of electricity from its reactors and this was expected to increase to at least 40% by 2017. The plan is now for uranium to supply at least 20% of the nation’s needs by 2030, data from the World’s Nuclear Association shows.

Since 2015, 11 reactors have been restarted and another 16 are waiting for approval.

The inclusion of uranium in the list of critical minerals will allow Japan to allocate more funds and resources for uranium-related research and development, as well as to strengthen its cooperation with other countries that share its interest in securing a stable supply of the mineral.

While public opposition and legal challenges to nuclear power in Japan remain strong, some experts argue uranium is essential for Japan to achieve its goal of net-zero greenhouse gas emissions by 2050.
https://www.mining.com/japan-adds-urani ... -minerals/

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