Japanese Prime Minister Shinzo Abe is expected to call on Wednesday for a stronger response to try to stop highly radioactive water leaking into the ocean from the crippled Fukushima nuclear plant, the Nikkei newspaper reported.
It also said the government would commit taxpayer money to halt the buildup of radioactive water at the plant.
(Read more: Japan nuclear body says radioactive water at Fukushima an 'emergency')
On Monday, an official from Japan's nuclear watchdog told Reuters the leakage had become an "emergency", adding that the operator of the plant, Tokyo Electric Power (Tepco), was struggling to contain the problem.
Tepco has been widely castigated for its failure to prepare for the massive 2011 earthquake and tsunami that devastated its Fukushima plant and lambasted for its inept response to the meltdown of three reactors at the facility, 200 kilometers (125 miles) northeast of Tokyo.