In fact, there was a rumor that JR West seriously considered changing the train name because the operation began immediately after the accident of sodium leakage from the Monju reactor.
実際、高速増殖炉のナトリウム漏れ事故発生直後の列車設定だったため、JR西日本が登場間際の愛称変更も真剣に検討した、という話も残っている。