By Matt Smith, CNN
April 19, 2011 6:40 a.m.
Radiation levels may allow workers to re-enter unit 2. Authorities hope to treat and re-use contaminated water. Workers began pumping water out of the unit's turbine plant Tuesday. Tokyo Electric hopes to wind down the crisis in six months. The disaster has led to mandatory evacuations of about 78,000 people living within 20 km (12.5 miles) of the plant and orders to people living another 10 km away to remain sheltered, affecting another 60,000-plus.