What are three means by which an operator can determine whet

What are three means by which an operator can determine whether natural circulation exists in the reactor coolant system, or other heat removal systems? For each of the means, explain how it is an indication of natural circulation.

Solution

for natural circulation:

DT ( hot-cold) 25% to 80% of full power

Steam pressure

Thot/T cold value

Natural circulation can happen if : temp diff between heat source and sink, source lower than sink, fluids in thermal contact.