Example 2

A nuclear reactor core is formed from a series of molybdenum tubes containing a mixture of uranium fluoride and sodium fluoride. The uranium is enriched in U235 isotope. The tubes are located in channels in graphite blocks and a coolant liquid passes downwards through the channel between the graphite and the tube.

FIG. 3 shows an arrangement in which the bulbs 301 of the passive reactor control devices are located below the fuel tubes, i.e. below the fuel salt 310, and the stems 302 extend up between the graphite moderators 320 and the fuel salt 310.

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