Induced nuclear reactions: processes – systems – and elements – With control of reactor – By coolant flow
Patent
1993-01-05
1995-01-31
Walsh, Donald P.
Induced nuclear reactions: processes, systems, and elements
With control of reactor
By coolant flow
376444, G21C 332
Patent
active
053864409
ABSTRACT:
An object of the present invention is to provide a boiling water reactor wherein two phase flow instability in a fuel assembly occurs scarcely.
A bottom flow path is formed beneath a partition plate which is supported by control rod driving mechanism housings in a reactor pressure vessel, and coolant guide tubes which open beneath the partition plate stands perpendicularly on the partition plate. An upper end portion of the coolant guide tube is restrained at outer periphery by a fixing portion of a square grid, and a coolant entrance of a fuel assembly is connected through to the coolant guide tube.
Pressure loss of the coolant decreases and flow instability of the coolant in the fuel assembly occurs scarcely, lowering of a critical power ratio at a pump trip can be suppressed.
REFERENCES:
patent: 4686079 (1987-08-01), Ishikawa et al.
patent: 4781885 (1988-11-01), Lill et al.
patent: 4795608 (1989-01-01), Nylund
patent: 4803044 (1989-02-01), Patterson
Kanazawa Toru
Kashiwai Shin-ichi
Moriya Kumiaki
Nishida Koji
Orii Akihito
Hitachi , Ltd.
Voss Frederick H.
Walsh Donald P.
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