NEW : Tokyo Electric plans a new structure to support the No . 4 unit 's spent nuclear fuel pool . Robots probe darkened reactor No . 4 . Iitate is about 40 kilometers northwest of the plant , outside the danger zones drawn in the early days of the crisis . Radiation readings in one town are halfway to the government 's safe zone . Tokyo Electric says it will take 6 to 9 months to wind down the nuclear crisis .
NEW : Tokyo Electric plans a new structure to support the No . 4 unit 's spent nuclear fuel pool . Robots probe darkened reactor No . 4 . Radiation readings in one town are halfway to the government 's safe zone . Tokyo Electric says it will take 6 to 9 months to wind down the nuclear crisis .