SHUT-DOWN DEVICE FOR NUCLEAR REACTORS
A shut-down device for nuclear reactors comprises a tube normally closed at its lower extremity and passing vertically through the reactor core. Above the reactor core region the said tube is enclosed by an annular container filled with neutron-absorbing balls. The bottom of said container may communicate with the inside of the tube by lateral openings in its wall, these openings normally being closed by a cylinder sliding in this tube. This cylinder is suspended on a supporting head normally held in position by an annular electro-magnet positioned above the said cortainer. The suspension is performed via a bellow which inside communicates with the reactor vessel via a small opening in the bellow wall, so that by a quick shut-down of the reactor pressure the bellow expands and moves the cylinder downwards, opening in this manner the communication with the ball container so that the balls may fall down into the core region of the tube for stopping the chain reaction. When the electro-magnet releases the said supporting head, the latter acts via pushing bars directly on the cylinder, causing in this manner a reactor shut-down independently from the working of the bellow. (NPO)
- Research Organization:
- Originating Research Org. not identified
- NSA Number:
- NSA-16-015871
- OSTI ID:
- 4792106
- Report Number(s):
- FR 1259603
- Country of Publication:
- France
- Language:
- English
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