Boiling water nuclear reactor and start-up process thereof

Details Boiling water nuclear reactor and start-up process thereof Boiling water nuclear reactor and start-up process thereof

1991-03-14

1993-12-14

Wasil, Daniel D.

Induced nuclear reactions: processes, systems, and elements

With control of reactor

Reactor start-up

G21C 700

Patent

active

052710440

ABSTRACT:
In a boiling water nuclear reactor, a reactor primary cooling water line is filled with water at the start-up time, and the inside of a pressure vessel is pressurized by a pressurized tank and at the same time control rods are withdrawn to thereby heat cooling water in a state of single-phase flow to high temperature. Succeedingly, the pressurization is released and the pressure of the pressure vessel is gradually approximated to the saturation pressure corresponding to the cooling water temperature to thereby make the cooling water transit into a state of two-phase flow, and thereafter the cooling water is heated by nuclear reaction in the state of two-phase flow to thereby obtain predetermined reactor running temperature and pressure. This prevents the flow fluctuation and the reduction of stability of core due to occurrence of unstable phenomena of low temperature two-phase flow at the start-up time of the reactor to thereby make it possible to perform stable starting-up of the reactor and to shorten the start-up time of the reactor to thereby realize improvement in economy as well as reliability.

REFERENCES:
patent: 4077836 (1978-03-01), Omori et al.
patent: 4343682 (1982-08-01), Grimes et al.
patent: 4734249 (1988-03-01), Utamura et al.
"Transient Behavior of Natural Circulation for Boiling Two-Phase Flow", Aritomi et al, Japan Mechanical Society, 68th National Meeting, vol. C, Sep. 1990.

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