dump tankn. a tank used for receiving a sudden discharge of liquid from a reactor or for storing radioactive liquids while they are dangerous.
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1959 Nuclear Energy Engineer XIII. 337 Reactor for Chalk River... Dump tanks.
1964 C. F. Bonilla in Reactor Handbk. (ed. 2) IV. iii. 122/1Dump tanks in any of the coolant systems may receive hot discharge from the system at any time.