永久とわ保ほ管かんMeaningsNoun1. permanent storage (radioactives, data, etc.)Other readings永えい久きゅう保ほ管かんKanji used永eternity久long time保preserve管pipeComposed of永久とわeternity; perpetuity; permanenceNoun保ほ管かんcharge; custody; safekeeping; deposit; storageNoun