Members of the Northern Land Council will tour Sydney's Lucas Heights nuclear reactor tomorrow to help them decide whether to nominate an alternative site for a waste dump in the Northern Territory.

The Federal Government has proposed three locations for the facility, two in central Australia and a third near Katherine.

Under the Commonwealth's radioactive waste management legislation a Territory land council can nominate an alternative site.

The Northern Land Council is considering its position and will tour the Australian Nuclear Science and Technology Organisation (ANSTO) reactor tomorrow along with its low level waste area and environment division.