Nuclear reactor cavity streaming shield
AssigneeCombustion Engineering, Inc.
InventorsRobert J. Klotz, Donald W. Stephen
Life of this patent
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Abstract
The upper portion of a nuclear reactor vessel supported in a concrete reactor cavity has a structure mounted below the top of the vessel between the outer vessel wall and the reactor cavity wall which contains hydrogenuous material which will attenuate radiation streaming upward between vessel and the reactor cavity wall while preventing pressure buildup during a loss of coolant accident.
Claims9
A radiation shield for a nuclear reactor vessel, including,
- a reactor pressure vessel in the form of a vertical cyclinder,
- a concrete reactor cavity structure spaced about the external wall of the pressure vessel,
- a series of rings of hydrogeneous material spaced from each other and mounted in the annulus between the vessel and reactor cavity structure to avoid any upward and straight and vertical line of sight in the annulus from below the rings,
- whereby radiation streaming up the annulus from below the rings will be attenuated while a loss of coolant accident will result in a minimal pressure buildup in the annulus.
A radiation shield positioned in the cavity annulus between a cylindrical nuclear reactor vessel and the surrounding walls of a concrete reactor cavity structure to attenuate radiation streaming up the cavity annulus while providing minimal pressure buildup following a loss of coolant accident below the shield, including,
- a collection of rings of hydrogeneous material spaced horizontally in rows and the rows spaced vertically from each other with the horizontal spaces between the rings of each row out of vertical register with the horizontal spaces of adjacent rows to obviate all vertical line of sight in the cavity annulus from below the collection,
- and structure extending from the concrete reactor cavity structure to fix, the rings in their individually spaced positions and their collective position below the upper end of the vessel.
Dependencies are inferred from the claim text.