Induced nuclear reactions: processes – systems – and elements – Reactor protection or damage prevention – By minimizing positive coolant void coefficient
Patent
1991-06-13
1992-06-09
Hunt, Brooks H.
Induced nuclear reactions: processes, systems, and elements
Reactor protection or damage prevention
By minimizing positive coolant void coefficient
376210, 376395, 376399, 376373, 376377, G21C 732
Patent
active
051204932
ABSTRACT:
A forced-circulation boiling-water reactor includes bypass check valves between a downcomer and a core inlet plenum. When the recirculation pumps are operating at full capacity, there is a maximum pressure differential from the downcomer to the core inlet plenum. This pressure differential keeps the valves closed so that recirculating fluid is constrained to flow through the pumps. When the pumps are not operating, a driving water head in the downcomer forces the valves open, augmenting the flow cross section between the downcomer and the core inlet plenum, enhancing natural circulation. The enhanced natural circulation provides greater core stability during pump shutdown. The valves are selected or adjusted so that they open when the pressure differential falls through a predetermined range to augment diminished pumping capacity with a higher natural circulation flow rate.
REFERENCES:
patent: 3212985 (1965-10-01), Hackney
patent: 3429775 (1969-02-01), Petersen
patent: 5073335 (1991-12-01), Townsend
Kobsa Irvin R.
Marquino Wayne
Pallette James R.
General Electric Company
Hunt Brooks H.
Schroeder Robert R.
Voss Frederick H.
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