SHUT-DOWN DEVICE FOR NUCLEAR REACTORS
A shut-down device for a nuclear reactor comprises a tube normally closed at its lower extremity. This tube can be positioned in a vertical reactor channel and is adapted to receive a great number of neutron-absorbing balls for reactor shut-down. This tube encloses a central rod which bounds with the inner wall of said tube an annular space which is situated in the core region and into which the said balls may full. Before the shut-down, the balls are stored In a cylindrical contamer mounted above the said annular space, in a region outside the reactor core. The release of the balls is performed by opening of a valve mounted at the lower extremity of this container, the valve body being fastened on a bar passing through a tube mounted in the axis of the container and the bar being held by an electromagnet. 0n de-energizing this electromagnet, the valve body moves down by gravity, inducing in this manner the release of the balls. For recuperating the balls, the tube which forms a unity with the container is withdrawn from the reactor and a valve at its lower extremity is opened so that the balls fall out of the tube. For delivering the balls into the container, a feeding tube is provided passing through the radiationshield plug situated in the upper portion of said-unit. (NPO)
- Research Organization:
- Originating Research Org. not identified
- NSA Number:
- NSA-16-015864
- OSTI ID:
- 4795867
- Report Number(s):
- FR 1256718
- Country of Publication:
- France
- Language:
- English
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SHUT-DOWN DEVICE FOR NUCLEAR REACTORS
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