Reactivity control system and method

Induced nuclear reactions: processes – systems – and elements – With control of reactor – By movement of control element or by release of neutron...

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376328, 376282, G21C 722

Patent

active

051300788

ABSTRACT:
A method and system for controlling nuclear reactivity in a nuclear reactor are disclosed. The method includes maintaining a nuclear position solution at an initial poison pressure less than the steam pressure within the reactor vessel. The method further includes channeling a pressurizing fluid into the holding tank for pressurizing the poison solution to a pressure greater than the initial pressure thereof, and draining by gravity the poison solution from the holding tank and into the reactor vessel for mixing with the water to reduce reactivity in the core.
The system includes the holding tank, apparatus for channeling the pressurizing fluid from the reactor vessel to the holding tank, apparatus for channeling the poison solution from the holding tank by gravity into the reactor vessel, and a controller for opening a normally closed pressurizing valve and a normally closed drain valve to allow flow of the pressurizing fluid to, and the drained poison solution from, the holding tank through the respective channeling apparatus.

REFERENCES:
patent: 4643871 (1987-02-01), Fajeau
patent: 4753771 (1988-06-01), Conway et al.
Wilkins et al., Advanced BWR: Design Improvements Build on Proven Technology, Nuclear Engineering International, reprint Jun. 1986, pp. 1-7 and drawing entitled "The World's Reactors No. 89".
T. Baumeister, Standard Handbook for Mechanical Engineers, 1967, Title and copyright pages, and pp. 14-16 through 14-19.

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