accidental depressurization of the primary coolant system
- awaryjny spadek ciśnienia w obiegu pierwotnym
English-Polish dictionary for engineers. 2013.
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Nuclear meltdown — Three of the reactors at Fukushima I overheated, causing core meltdowns. This was compounded by hydrogen gas explosions and the venting of contaminated steam which released large amounts of radioactive material into the air. … Wikipedia