But he added: "There is no shortcut to resolving these issues. Though it will be difficult, we have to go step by step to resolve these problems one by one."
Plan aims to control Japan nuke crisis →
Goshi Hosono, special adviser to Prime Minister Naoto Kan, told reporters Monday that "we have to assume that meltdowns have taken place" at reactors 1, 2 and 3.
4 workers flee damaged Japanese nuke plant →