Abstract
There are two major issues in the design of natural circulation systems (NCSs). One is to arrive at the maximum design power and the other is to ensure that the operating procedures and the operational transients do not lead to instability. The maximum design power depends on the critical heat flux (CHF) threshold and the stability threshold. If the CHF threshold is more than the Type II stability threshold, then the maximum power rating is stability-controlled. On the other hand, if the CHF threshold is below the Type II stability threshold, then the maximum power rating is CHF-controlled. There is also a third possibility that the maximum power is CHF-controlled for low inlet subcooling and stability-controlled for high inlet subcooling regions.
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