System for mitigating the effects of an accident at a nuclear po

Details System for mitigating the effects of an accident at a nuclear po System for mitigating the effects of an accident at a nuclear po

1975-06-04

1977-11-01

Engle, Samuel W.

176 87, G21C 900

Patent

active

040564363

ABSTRACT:
A system for mitigating the effects of an accident, such as loss of coolant, at a nuclear power plant, comprising a first container accommodating a nuclear reactor and its primary cooling system, and a second container communicating with the first container to receive and contain the air forced out therefrom as the pressure in the first container rises to an unusally high level as a result of vaporization caused by ebullition of the leaking coolant. In accordance with the invention, the first and second containers communicate through a conduit in which is placed a vapor condenser which is a bubbling device. To prevent the air forced out from the first container from returning thereto, a non-return valve is provided at the inlet to the second container. The first container also accommodates a supplementary condenser of the sprinkler type. Owing to air being forced out from the first container into the second one and vapor condensation in the former, a negative pressure develops, at the initial stage of the accident, in the second container, which is maintained over a long period of time. The occurrence of the negative pressure and its persistence over a long period of time preclude release of radioactive products to the environment.

REFERENCES:
patent: 3022238 (1962-02-01), Kolflat
patent: 3115450 (1963-12-01), Schanz
patent: 3301761 (1967-01-01), Johnson et al.
patent: 3307913 (1967-03-01), Chave
patent: 3321374 (1967-05-01), Windle et al.
patent: 3379613 (1968-04-01), Tagami et al.
patent: 3438857 (1969-03-01), Sulzer
patent: 3718539 (1973-02-01), West et al.

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