Higher temperature, oil temperature increase, decrease viscosity, steam increased, the limit will cause a vacuum up, we should strengthen the ventilation cooling.

环境温度较高时，油温升高，粘度下降，饱和蒸汽增大，会引起极限真空上升，应加强通风散热。

youdao

When the greenhouse temperature deviation over the upper limit set, the issue of regulation of computer instructions, the executing agency to open the ventilation cooling system;

当温室内的温度超过设定偏差上限，计算机发出调节 指令，执行机构打开通风降温系统；

youdao

As of 14:00 local time (05:00 GMT) on Friday, the temperature of water inside the cooling pool at reactor 3 was 15.1C, well below the safety limit of 65C, Tepco said.

BBC: Fukushima nuclear plant: Cooling system power restored