The restart of a Japanese nuclear reactor underscores the nation's critical shortage of space for storing spent nuclear fuel and a lack of radioactive waste disposal plans.

The reboot highlights a dire problem for the country's nuclear program. Japan is running out of space to store spent nuclear fuel and lacks plans for radioactive waste disposal. <img alt="FILE - The operation floor inside the Unit 6 reactor building is pictured during a media tour at Tokyo Electric Power Company Holdings" src="https://npr.brightspotcdn.com/dims3/default/strip/false/crop/8000x5333+0+0/resize/8000x5333!/?url=http%3A%2F%2Fnpr-brightspot.s3.amazonaws.com%2Fe0%2F1e%2F407e99c44b2bb907...