The US Congress says President Barack Obama's plans for the country's nuclear arsenal will cost 355 billion dollars over the next decade. The Congressional Budget Office has issued a report saying the expenses will cover the modernization of nuclear weapons, their delivery systems, and nuclear weapons production laboratories. The CBO report also said the cost is nearly one hundred and 50 billion dollars more than the administration's initial request last year. The US president claims the nuclear modernization plan is needed to boost the security of the US military and give political leaders enough confidence in nuclear talks with other world powers. The new nuclear budget request comes as US officials continue to wrangle over the country's rising budget deficit.