4. Protective chains
Protections can be broken down into three groups according to their purpose:
nuclear boiler protection ;
generating set protection ;
water station protection.
During the development of abnormal situations in the nuclear boiler, protection is provided by logic circuits which, depending on the case, trigger different protective actions:
automatic reactor shutdown ;
start-up of GV emergency feedwater ;
isolation of steam lines from the high-speed generator;
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Protective chains