"The Centre should give up its plan to commission the plant this month since some of the experts have pointed out that part of the reactor has defects," he said in a statement here.
Achuthanandan said experts like former chairman of Atomic Energy Regulatory Board Dr Goapalakrishnan had come out with statements in this regard.
"It would be wrong on the part of the Government to go ahead with its plan to commission the plant ignoring the warnings of experts and overlooking the protests of the local people," the former Kerala chief minister said.
Achuthandnan was a few months ago pulled up by his party's state and central leadership for defying the official line on the Kudankulam nuclear power plant by openly supporting the agitation demanding its closure and making an attempt to visit the plant site to express solidarity with the agitation.
While the CPI-M officially disagrees with the anti-nuclear energy campaigners' demand for scrapping the plant, Achuthanandan had often stated openly that he firmly believed that nuclear plants are dangerous anywhere in the world.