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23 Dec 2025·Source: The Indian Express
2 min
Science & TechnologyEnvironment & EcologyInternational RelationsNEWS

Japan Revives Nuclear Power: World's Largest Plant Set for Restart

Fifteen years post-Fukushima, Japan greenlights world's largest nuclear plant restart.

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Japan Revives Nuclear Power: World's Largest Plant Set for Restart

Photo by Lukáš Lehotský

Japan is set to restart the Kashiwazaki-Kariwa nuclear power plant, the world's largest, 15 years after the devastating Fukushima disaster. This move, approved by the nuclear regulator, signals a significant shift in Japan's energy policy, aiming to reduce reliance on imported fossil fuels.

The plant, operated by Tokyo Electric Power Company (TEPCO), has been offline since 2012 due to safety concerns and a series of scandals, including security breaches. The restart is crucial for Japan's energy security and climate goals, but it faces public skepticism regarding nuclear safety.

Visual Insights

Japan's Nuclear Landscape: Kashiwazaki-Kariwa & Fukushima

This map highlights the location of the Kashiwazaki-Kariwa Nuclear Power Plant, the world's largest, which is set for restart, and the Fukushima Daiichi plant, site of the 2011 disaster. It provides geographical context to Japan's renewed focus on nuclear energy.

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📍Kashiwazaki-Kariwa NPP📍Fukushima Daiichi NPP📍Japan

Japan's Nuclear Power Journey: From Fukushima to Kashiwazaki-Kariwa Restart

This timeline illustrates the critical events in Japan's nuclear energy policy, from the Fukushima disaster to the recent approval for the restart of the Kashiwazaki-Kariwa plant, highlighting the shift in energy strategy.

Following the 2011 Fukushima disaster, Japan shut down all its nuclear reactors and significantly increased fossil fuel imports. However, rising energy costs, geopolitical instability, and climate commitments have prompted a strategic re-evaluation, leading to the gradual restart of some reactors and the approval for Kashiwazaki-Kariwa, despite lingering public safety concerns.

  • 2011Tohoku Earthquake & Tsunami, Fukushima Daiichi Nuclear Disaster. All Japanese reactors eventually shut down.
  • 2012Kashiwazaki-Kariwa Nuclear Power Plant (NPP) goes offline for safety checks and upgrades.
  • 2013Japan's Nuclear Regulation Authority (NRA) established, replacing previous agencies, with stricter safety standards.
  • 2015First reactors (Sendai NPP) restart under new safety standards, signaling a cautious return to nuclear power.
  • 2021TEPCO (operator of Kashiwazaki-Kariwa) faces security breaches and safety lapses at the plant, delaying restart approvals.
  • 2022Global energy crisis exacerbated by Russia-Ukraine war intensifies Japan's push for energy security and nuclear restarts.
  • 2024NRA lifts operational ban on Kashiwazaki-Kariwa, paving the way for restart preparations after TEPCO addresses safety issues.
  • 2025Kashiwazaki-Kariwa NPP set for restart, 15 years after Fukushima, marking a significant policy shift for Japan.

Quick Revision

1.

Kashiwazaki-Kariwa nuclear power plant is the world's largest

2.

Plant operated by Tokyo Electric Power Company (TEPCO)

3.

Offline since 2012

4.

Restart approved by nuclear regulator

Key Dates

2011 - Fukushima disaster2012 - Kashiwazaki-Kariwa plant went offlineDecember 22 - Nuclear regulator approved restart

Key Numbers

15 years - since Fukushima disaster

Exam Angles

1.

Energy Security and Policy (GS-3)

2.

Climate Change and Renewable Energy (GS-3)

3.

Science & Technology - Nuclear Energy (GS-3)

4.

Disaster Management and Safety Regulations (GS-3)

5.

International Relations - Japan's strategic energy choices (GS-2)

More Information

Background

Japan, a nation highly dependent on imported fossil fuels, drastically reduced its reliance on nuclear power following the 2011 Fukushima Daiichi disaster. This led to increased fossil fuel imports, impacting its economy and climate goals. The Kashiwazaki-Kariwa plant, the world's largest, has been offline since 2012 due to safety concerns and scandals.

Latest Developments

The nuclear regulator has approved the restart of the Kashiwazaki-Kariwa nuclear power plant, signaling a major policy shift. This move is driven by Japan's need for energy security, reducing dependence on volatile fossil fuel markets, and meeting its climate change commitments. The restart, however, faces significant public skepticism regarding nuclear safety.

Practice Questions (MCQs)

1. Consider the following statements regarding nuclear power and its context in Japan: 1. The Kashiwazaki-Kariwa nuclear power plant, set for restart, is operated by Tokyo Electric Power Company (TEPCO). 2. Japan's decision to revive nuclear power is primarily driven by its commitment to reduce reliance on imported fossil fuels and achieve climate goals. 3. The Fukushima Daiichi disaster, which led to the shutdown of many Japanese nuclear plants, involved a meltdown in a Pressurized Water Reactor (PWR) design.

  • A.1 and 2 only
  • B.2 and 3 only
  • C.1 and 3 only
  • D.1, 2 and 3
Show Answer

Answer: A

Statement 1 is correct as per the news. Statement 2 is correct, as Japan aims to enhance energy security and meet climate targets. Statement 3 is incorrect; the Fukushima Daiichi disaster involved Boiling Water Reactors (BWRs), not PWRs. The plant had six BWRs, three of which experienced meltdowns.

2. In the context of nuclear energy and safety regulations, which of the following statements is/are correct? 1. The International Atomic Energy Agency (IAEA) is an autonomous intergovernmental organization that establishes legally binding safety standards for its member states. 2. Boiling Water Reactors (BWRs) and Pressurized Heavy Water Reactors (PHWRs) are the two most common types of light water reactors used globally. 3. Nuclear power generation is considered a low-carbon energy source because it produces negligible greenhouse gas emissions during its operational phase.

  • A.1 and 2 only
  • B.3 only
  • C.2 and 3 only
  • D.1, 2 and 3
Show Answer

Answer: B

Statement 1 is incorrect. While IAEA sets safety standards, they are generally not legally binding but serve as a global reference for national regulations. Member states are expected to adopt them. Statement 2 is incorrect. BWRs and Pressurized Water Reactors (PWRs) are the most common types of light water reactors. PHWRs (like India's CANDU-type reactors) use heavy water as a moderator and coolant, not light water. Statement 3 is correct. Nuclear power plants produce very little greenhouse gas during operation, making them a low-carbon option for electricity generation.

3. Which of the following statements correctly describes a challenge associated with nuclear power generation? 1. The long-term disposal of high-level radioactive waste remains a significant environmental and safety concern globally. 2. The initial capital cost for constructing nuclear power plants is generally lower compared to large-scale renewable energy projects like solar farms. 3. Nuclear power plants are highly susceptible to fluctuations in fuel supply due to the scarcity of uranium reserves worldwide.

  • A.1 only
  • B.1 and 2 only
  • C.2 and 3 only
  • D.1, 2 and 3
Show Answer

Answer: A

Statement 1 is correct. The safe and permanent disposal of high-level radioactive waste is a major challenge, with many countries still seeking long-term solutions. Statement 2 is incorrect. Nuclear power plants typically have very high initial capital costs due to complex safety systems and construction requirements, often exceeding those of many renewable projects. Statement 3 is incorrect. While uranium is a finite resource, its supply is relatively stable, and nuclear plants require relatively small amounts of fuel compared to fossil fuel plants, making them less susceptible to short-term fuel supply fluctuations. The issue is more about enrichment and geopolitical control than scarcity for current operational needs.

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