Category Archives: Passive Safety Systems and Natural Circulation in Water Cooled Nuclear Power Plants

Natural circulation in containment

The containment cooling system (see Fig. II-6) includes design features for circulation and cooling of the RB atmosphere both during normal operation and following an accident. During normal operation local air coolers (LACs) operate to remove heat from the RB atmosphere. Two fuelling machine vaults and steam generator enclosures are atmospherically isolated from the rest of the RB.

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Liquid temperature stratification

Nuclear reactors that implement natural circulation passive safety systems may produce large temperature gradients in their working fluid as a result of local cooling caused by emergency core coolant (ECC) injection or local heating caused by steam condensation or heat exchanger heat transfer. Thermal stratification arises because the low flow condition typically encountered in a natural circulation system greatly reduces […]

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Integrated system response to a large break LOCA

The most effective means of describing natural circulation in the HTS, Calandria and containment is to integrate their operation in response to a large break loss of coolant accident (LOCA). The first phase of a LOCA is the subcooled blow down phase. During this phase, high pressure subcooled liquid is vented from the break under choked flow conditions. The primary […]

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