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Title: Nuclear reactor with low-level core coolant intake

A natural-circulation boiling-water reactor has skirts extending downward from control rod guide tubes to about 10 centimeters from the reactor vessel bottom. The skirts define annular channels about control rod drive housings that extend through the reactor vessel bottom. Recirculating water is forced in through the low-level entrances to these channels, sweeping bottom water into the channels in the process. The sweeping action prevents cooler water from accumulating at the bottom. This in turn minimizes thermal shock to bottom-dwelling components as would occur when accumulated cool water is swept away and suddenly replaced by warmer water.
Authors:
 [1] ;  [2]
  1. (Livermore, CA)
  2. (Campbell, CA)
Publication Date:
OSTI Identifier:
868648
Report Number(s):
US 5183627
DOE Contract Number:
AC03-90SF18494
Resource Type:
Patent
Research Org:
GENERAL ELECTRIC CO
Country of Publication:
United States
Language:
English
Subject:
nuclear; reactor; low-level; core; coolant; intake; natural-circulation; boiling-water; reactor; skirts; extending; downward; control; rod; guide; tubes; 10; centimeters; reactor; vessel; bottom; skirts; define; annular; channels; control; rod; drive; housings; extend; reactor; vessel; bottom; recirculating; water; forced; low-level; entrances; channels; sweeping; bottom; water; channels; process; sweeping; action; prevents; cooler; water; accumulating; bottom; minimizes; thermal; shock; bottom-dwelling; components; occur; accumulated; cool; water; swept; suddenly; replaced; warmer; water; circulating water; water reactor; thermal shock; rod drive; control rod; control rod; reactor vessel; reactor vessel; nuclear reactor; guide tube; vessel bottom; vessel bottom; minimizes thermal; boiling-water reactor; rod guide; core coolant; guide tubes; circulation boiling; action prevents; annular channel; annular channels /376/