Boiling water reactor

Details Boiling water reactor Boiling water reactor

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

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