Mitsubishi Heavy Develops the SRZ-1200

Mitsubishi Heavy is developing, with its partners, a new nuclear reactor, the SRZ-1200. It has a capacity of 1,200 MWe.

Share:

Comprehensive energy news coverage, updated nonstop

Annual subscription

8.25$/month*

*billed annually at 99$/year for the first year then 149,00$/year ​

Unlimited access • Archives included • Professional invoice

OTHER ACCESS OPTIONS

Monthly subscription

Unlimited access • Archives included

5.2$/month*
then 14.90$ per month thereafter

FREE ACCOUNT

3 articles offered per month

FREE

*Prices are excluding VAT, which may vary depending on your location or professional status

Since 2021: 35,000 articles • 150+ analyses per week

Mitsubishi Heavy Industries (MHI) is partnering with four Japanese companies to develop a new nuclear reactor, the SRZ-1200. The consortium includes Mitsubishi Heavy, Kansai Electric Power Co, Hokkaido Electric Power Co, Shikoku Electric Power Co and Kyushu Electric Power Co. The project is expected to be completed by mid-2030.

This announcement comes as Japanese Prime Minister Fumio Kishida intends to restart the country’s nuclear power plants.

Mitsubishi Heavy is working on a new nuclear reactor

Mitsubishi Heavy is working, with 4 other Japanese companies, on a new light water reactor: the SRZ-1200. This reactor has many safety features compared to conventional pressurized light water reactors. Thus, MHI wants to provide Japan with a stable energy supply.

The SRZ-1200 has a capacity of 1,200 MWe. It is designed based on Japanese regulatory safety standards. These have been reinforced following the Fukushima accident. The development of the SRZ-1200 will then guarantee safety and reliability.

Mitsubishi Heavy explains:

“[Son développement répondra aux exigences en matière de] natural disaster resistance and security against terrorism and unforeseen events.”

The safety mechanisms developed by MHI include advanced accumulator design and systems that effectively reduce the probability of radioactive release in the event of an accident.

In addition, with the SRZ-1200, MHI intends to improve operational flexibility. In addition, it will be possible to adapt the SRZ-1200 for hydrogen production.

Bayridge Resources secures a majority stake in an advanced uranium project in Canada, strengthening its strategic presence in a geologically promising region.
A significant volume of concrete from the dismantling of the Sizewell A nuclear power plant is being transferred to support the foundations of the Sizewell C project, under a partnership between UK nuclear sector stakeholders.
Korean group KEPCO and UAE-based ENEC have signed two memorandums of understanding to expand their cooperation in civil nuclear energy, artificial intelligence, and digital technologies targeting new international markets.
The Janus programme will deploy micro nuclear power plants across nine military bases to reinforce energy autonomy for critical U.S. Army installations.
The Idaho National Laboratory has started irradiation testing on uranium-zirconium fuel samples from Lightbridge in its experimental reactor, marking a key step toward the industrial validation of advanced nuclear fuel.
NexGen Energy has opened Canadian Nuclear Safety Commission hearings for the final approval of its Rook I uranium project, following more than six years of regulatory process.
Oklo has signed a binding agreement with Siemens Energy to accelerate manufacturing of the energy conversion system for its first advanced nuclear power plant in the United States.
A security document handling incident at the nuclear power plant renews concerns about TEPCO as a key decision on restarting reactors 6 and 7 approaches in Niigata.
An initial civil nuclear cooperation agreement was signed between the United States and Saudi Arabia, prompting calls from the US Congress for strict safeguards to prevent a Middle East arms race.
The launch of the Zhaoyuan nuclear project anchors the Hualong One model inland, illustrating Beijing’s strategy of regulatory normalisation in response to Western technological restrictions.
TRISO-X has started above-ground works on the first U.S. facility dedicated to manufacturing fuel for small modular reactors, marking a key industrial milestone in the deployment of the Xe-100.
The first Russian test rig for the experimental ITER reactor has been delivered to the site in France, marking a major milestone in the international collaboration on nuclear fusion.
A strategic report reveals the industrial and energy potential of Allseas’ offshore small modular reactor, which could create up to 40,000 jobs and reduce investment in the power grid.
Canadian firm Aecon and private developer Norsk Kjernekraft have signed a strategic agreement targeting the deployment of BWRX-300 small modular reactors across several potential locations in Norway.
The South African government has officially lifted the PBMR reactor out of inactivity, launching a public investment programme and transferring the strategic nuclear asset from Eskom to Necsa.
The French Court of Auditors values EDF’s grand carénage at over €100bn, while EPR2 reactors already exceed €67–75bn. The State simultaneously directs regulation, financing, and industrial strategy, raising the risk of conflict of interest.
Belarus commits major public investment to add a third reactor at the Ostrovets plant and initiates studies for a second nuclear site to support national energy demand.
Framatome’s accident-tolerant fuel prototype has completed a second 24-month cycle in a commercial nuclear reactor in the United States, paving the way for a third phase of industrial testing.
The Wylfa site in Wales will host three Rolls-Royce small modular reactors from 2026, marking a strategic investment in the UK’s nuclear expansion.
EDF confirmed that the Flamanville EPR has reached a major milestone, while planning a nearly year-long shutdown in 2026 for extensive regulatory inspections and key component replacement.

All the latest energy news, all the time

Annual subscription

8.25$/month*

*billed annually at 99$/year for the first year then 149,00$/year ​

Unlimited access - Archives included - Pro invoice

Monthly subscription

Unlimited access • Archives included

5.2$/month*
then 14.90$ per month thereafter

*Prices shown are exclusive of VAT, which may vary according to your location or professional status.

Since 2021: 30,000 articles - +150 analyses/week.