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Title: Gas-cooled nuclear reactor

A gas-cooled nuclear reactor includes a central core located in the lower portion of a prestressed concrete reactor vessel. Primary coolant gas flows upward through the core and into four overlying heat-exchangers wherein stream is generated. During normal operation, the return flow of coolant is between the core and the vessel sidewall to a pair of motor-driven circulators located at about the bottom of the concrete pressure vessel. The circulators repressurize the gas coolant and return it back to the core through passageways in the underlying core structure. If during emergency conditions the primary circulators are no longer functioning, the decay heat is effectively removed from the core by means of natural convection circulation. The hot gas rising through the core exits the top of the shroud of the heat-exchangers and flows radially outward to the sidewall of the concrete pressure vessel. A metal liner covers the entire inside concrete surfaces of the concrete pressure vessel, and cooling tubes are welded to the exterior or concrete side of the metal liner. The gas coolant is in direct contact with the interior surface of the metal liner and transfers its heat through the metal liner to the liquid coolant flowing throughmore » the cooling tubes. The cooler gas is more dense and creates a downward convection flow in the region between the core and the sidewall until it reaches the bottom of the concrete pressure vessel when it flows radially inward and up into the core for another pass. Water is forced to flow through the cooling tubes to absorb heat from the core at a sufficient rate to remove enough of the decay heat created in the core to prevent overheating of the core or the vessel.« less
Authors:
 [1] ;  [2]
  1. (La Jolla, CA)
  2. (San Diego, CA)
Publication Date:
OSTI Identifier:
865675
Report Number(s):
US 4554129
DOE Contract Number:
AT03-76SF70046
Resource Type:
Patent
Research Org:
GA TECHNOLOGIES INC
Country of Publication:
United States
Language:
English
Subject:
gas-cooled; nuclear; reactor; gas-cooled; nuclear; reactor; central; core; located; portion; prestressed; concrete; reactor; vessel; primary; coolant; gas; flows; upward; core; overlying; heat-exchangers; stream; generated; normal; operation; return; flow; coolant; core; vessel; sidewall; pair; motor-driven; circulators; located; bottom; concrete; pressure; vessel; circulators; repressurize; gas; coolant; return; core; passageways; underlying; core; structure; emergency; conditions; primary; circulators; functioning; decay; heat; effectively; removed; core; means; natural; convection; circulation; hot; gas; rising; core; exits; top; shroud; heat-exchangers; flows; radially; outward; sidewall; concrete; pressure; vessel; metal; liner; covers; entire; inside; concrete; surfaces; concrete; pressure; vessel; cooling; tubes; welded; exterior; concrete; metal; liner; gas; coolant; direct; contact; interior; surface; metal; liner; transfers; heat; metal; liner; liquid; coolant; flowing; cooling; tubes; cooler; gas; dense; creates; downward; convection; flow; region; core; sidewall; reaches; bottom; concrete; pressure; vessel; flows; radially; inward; core; pass; water; forced; flow; cooling; tubes; absorb; heat; core; sufficient; rate; remove; decay; heat; created; core; prevent; overheating; core; vessel; natural convection; central core; coolant gas; radially inward; decay heat; decay heat; gas flows; liquid coolant; direct contact; normal operation; gas flow; reactor vessel; pressure vessel; pressure vessel; pressure vessel; pressure vessel; nuclear reactor; nuclear reactor; interior surface; coolant flow; hot gas; primary coolant; radially outward; cooled nuclear; cooled nuclear; prestressed concrete; metal liner; metal liner; metal liner; metal liner; cooling tubes; cooling tubes; cooling tubes; gas-cooled nuclear; gas-cooled nuclear; effectively removed; cooling tube; cooling tube; cooling tube; coolant flowing; gas rising; cooler gas; emergency conditions; gas coolant; gas coolant; concrete surfaces; convection circulation; flows radially; flows radially; flows upward; metal line; metal line; metal line; metal line; concrete reactor; convection flow; effectively remove /376/976/