In a large LOCA in a BWR, ECCS response comprises which combination?

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Multiple Choice

In a large LOCA in a BWR, ECCS response comprises which combination?

Explanation:
In a large LOCA scenario, the ECCS is designed to work in two stages: first, high-pressure injection to keep the core covered when the reactor pressure is still high, then depressurize and switch to low-pressure injection to continue cooling. The high-pressure stage uses HPCI and HPCS to inject coolant into the reactor. Once ADS depressurizes the vessel, LPCI and LPCS take over at low pressure to maintain core cooling. Containment Spray (CS) also participates in the low-pressure phase to remove heat and help manage containment pressure, often in coordination with LPCS. So the overall response combines the high-pressure injections (HPCI/HPCS) with the low-pressure injections (CS/LPCS and LPCI), which is why that option is the best fit.

In a large LOCA scenario, the ECCS is designed to work in two stages: first, high-pressure injection to keep the core covered when the reactor pressure is still high, then depressurize and switch to low-pressure injection to continue cooling. The high-pressure stage uses HPCI and HPCS to inject coolant into the reactor. Once ADS depressurizes the vessel, LPCI and LPCS take over at low pressure to maintain core cooling. Containment Spray (CS) also participates in the low-pressure phase to remove heat and help manage containment pressure, often in coordination with LPCS. So the overall response combines the high-pressure injections (HPCI/HPCS) with the low-pressure injections (CS/LPCS and LPCI), which is why that option is the best fit.

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