Please review my IELTS Task 1

The diagram below shows the production of steam using a gas cooled nuclear reactor.

Summarise the information by selecting and reporting the main features, and make comparisons where relevant.

My summary:

The diagram gives an insight into how a gas cooled nuclear reactor help to produce steam from water

Inside the concrete radiation shielding installed a pressure vessel where cool gas duct flow into it after giong through the gas blower. The gas duct then make its way through the graphite moderators, which contains uranium fuels elements, and push the boron control rods upward, allowing it to be emitted outside.

Afterwards, from initially being a cool gas duct, it is converted into hot gas duct and ready for the next step, heat exchanger. Water is piped to the exchanger through the water circulator and after moving throughout the tube, thanks to evaporation brought about by hot gas duct, the water is finally transformed into steam preparing for turbo-alternator. Up to this point, hot gas duct becomes cool again and probably continue its cyclic journey permanently.

Overall, although continuous, the process can be subdivided into two stages: heating gas duct through nuclear reactor and cooling gas to produce steam through heat exchanger.

Please comment on my mistakes hard-hittingly so as for me to improve my writing skills . Many thanks !