Japan’s Release of Fukushima Water into the Ocean

Japan’s Release of Fukushima Water into the Ocean 

Subject : Science and technology

Section: Nuclear technology

Context

• Japan’s announcement to begin releasing treated radioactive water from Fukushima nuclear plant into the sea.
• Scheduled commencement on August 24, with Prime Minister Fumio Kishida’s approval.

Plan Background and Criticisms

• Plan approved by the Japanese government two years ago to aid in decommissioning the Fukushima plant, operated by Tokyo Electric Power Company (Tepco).
• Notable criticism from China and local fishing groups due to potential safety and reputational issues.

Initial Release Breakdown

• Phased release strategy: water to be released in smaller quantities with heightened scrutiny.
• Initial discharge totaling about 7,800 cubic meters over a period of approximately 17 days.

Safety Validation

• Tritium concentration in released water (190 becquerels per liter) is below the World Health Organisation’s permissible limit for drinking water (10,000 becquerels per liter).
• IAEA’s approval of the plan is based on its compliance with international standards and minimal environmental impact.

Concerns of Neighboring Countries

• A formal complaint was lodged by China, emphasizing marine environment, food safety, and public health protection measures.
• Implementation of import controls by Hong Kong and Macau targeting Japanese seafood from specific regions.
• Comprehensive ban encompassing live, frozen, refrigerated, and dried seafood, along with sea salt and seaweed.
• South Korea acknowledged the scientific elements of the plan but refrained from unconditional support.

Fukushima nuclear disaster:

• March 11, 2011: A magnitude 9.0 earthquake and tsunami struck Fukushima Daiichi Nuclear Power Plant.
• Cooling systems failed due to the tsunami, causing reactors to overheat.
• Hydrogen explosions resulted from chemical reactions between overheated fuel rods and water.
• Escalating reactor damage led to the release of radioactive isotopes like iodine-131 and cesium-137.
• Evacuations were ordered, and a 20-kilometer exclusion zone was established to limit radiation exposure.

Tritium:

• Radioactive hydrogen isotope, 2 neutrons + 1 proton.
• Emits low-energy beta particles in decay.
• Uses: nuclear weapons boosting, fusion research, glow-in-the-dark devices.
• Weak external risk, ingestion/inhalation concerns for internal exposure.
• Naturally occurring, regulated due to potential impact.

Notable nuclear power plant disasters: