Intermittent reaction condensation reflux (loss of cooling capacity)

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If it is a batch reactor with condensation full reflux. The reaction kettle is equipped with a cooling jacket. So if I simply lose the chilled water for condensation return, the consequences include a large amount of explosive gas entering the exhaust system. What other consequences could there be? I’ve considered several possibilities, but I’m not sure if they are reasonable; could someone please help me check? Loss of solvent? This prevents the reaction heat from being removed promptly by the jacket, causing the reaction temperature to rise? The lack of cooling effect resulting from the absence of backflow disrupts the thermal balance; the jacket is unable to cool down, causing the reaction temperature to rise? (When designing, will the amount of cold heat returning be covered by the cooling capacity of the jacket?) ) Another issue is how we determine the pipe diameter when designing the return flow, in order to prevent liquid blockages caused by overly narrow return pipelines during backflow.