Japanese nuclear engineers on Monday started moving uranium and plutonium fuel rods at the crippled Fukushima nuclear plant, their most difficult and dangerous task since runaway reactors were brought under control two years ago. Operator Tokyo Electric Power (TEPCO) said it had begun the process of removing the rods from a pool inside a reactor building at the tsunami-hit plant, a tricky but essential step in the complex's decades-long decommissioning plan.