The announcement will come after the International Atomic Energy Agency (IAEA) approved Japan’s plans on Tuesday, saying they were consistent with global safety standards and would have a “negligible radiological impact to people and the environment”.

“We are currently at the final stage … and will be able to explain the results at tomorrow’s daily briefing,” Park Ku-yeon, a vice-ministerial official at South Korea’s Office for Government Policy Coordination, told reporters.

The administration of President Yoon Suk-yeol has faced a tricky line responding to the issue given improving relations with Japan, just as the risk of a broader consumer backlash persists.

Some consumer have been snapping up sea salt ahead of the planned release of water.