The energy released by the nuclear reaction is transformed into heat.
核反应中释放出来的能被转变为热。
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During a nuclear fission chain reaction, the tubes heat up to extremely high temperatures, and the way to keep them safe turns out to also be the way to extract useful energy from them.
Other nuclear plants across the country have been shut down for emergency safety tests over the summer, usually the time of peak energy demand in Japan due to the heat and humidity.