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Title: Boiling water neutronic reactor incorporating a process inherent safety design

A boiling-water reactor core is positioned within a prestressed concrete reactor vessel of a size which will hold a supply of coolant water sufficient to submerge and cool the reactor core by boiling for a period of at least one week after shutdown. Separate volumes of hot, clean (non-borated) water for cooling during normal operation and cool highly borated water for emergency cooling and reactor shutdown are separated by an insulated wall during normal reactor operation with contact between the two water volumes being maintained at interfaces near the top and bottom ends of the reactor vessel. Means are provided for balancing the pressure of the two volumes at the lower interface zone during normal operation to prevent entry of the cool borated water into the reactor core region, for detecting the onset of excessive power to coolant flow conditions in the reactor core and for detecting low water levels of reactor coolant. Cool borated water is permitted to flow into the reactor core when low reactor coolant levels or excessive power to coolant flow conditions are encountered.
Authors:
 [1]
  1. (Kingston, TN)
Publication Date:
OSTI Identifier:
866254
Report Number(s):
US 4666654
DOE Contract Number:
W-7405-ENG-26
Resource Type:
Patent
Research Org:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN
Country of Publication:
United States
Language:
English
Subject:
boiling; water; neutronic; reactor; incorporating; process; inherent; safety; design; boiling-water; reactor; core; positioned; prestressed; concrete; reactor; vessel; size; hold; supply; coolant; water; sufficient; submerge; cool; reactor; core; boiling; period; week; shutdown; separate; volumes; hot; clean; non-borated; water; cooling; normal; operation; cool; highly; borated; water; emergency; cooling; reactor; shutdown; separated; insulated; wall; normal; reactor; operation; contact; water; volumes; maintained; interfaces; near; top; bottom; reactor; vessel; means; provided; balancing; pressure; volumes; interface; zone; normal; operation; prevent; entry; cool; borated; water; reactor; core; region; detecting; onset; excessive; power; coolant; flow; conditions; reactor; core; detecting; water; levels; reactor; coolant; cool; borated; water; permitted; flow; reactor; core; reactor; coolant; levels; excessive; power; coolant; flow; conditions; encountered; coolant water; coolant level; borated water; borated water; borated water; water level; water reactor; neutronic reactor; reactor coolant; reactor coolant; normal operation; normal operation; reactor vessel; reactor vessel; reactor core; reactor core; reactor core; reactor core; reactor core; coolant flow; coolant flow; reactor shutdown; prestressed concrete; boiling water; core region; reactor operation; normal reactor; flow conditions; flow conditions; boiling-water reactor; reactor incorporating; excessive power; excessive power; water sufficient; concrete reactor /376/976/