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Article #213: Nuclear Energy: What is a Pebble Bed Modular Reactor? Part Two

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The Chinese plan a 200 megawatt discharge hazardous wastes. The reactor
production plant by 2007 and have firm kicked into idle. The continuous
plants for thirty PBMR plants by 2020, refueling prevents excess reactivity in
providing 6 gigawatts. Reports have also the core, and allows for the ongoing
been made that China hopes to deploy up inspection of the fuel elements.
to 300 gigawatts of reactors by 2050. By The major roadblock thrown up by PBMR
comparison, the world's entire nuclear critics refers to a small accident in
energy capacity in 2002 was about 363 1986 in Germany, which came about when
gigawatts. The world's two largest reactor operators attempted to dislodge a
civilian nuclear programs, the United jammed pebble in a feeder tube. The
States and France, amounted to about 160 accident released small amounts of
gigawatts. The Pebble Bed Modular Reactor radiation in the surrounding area.
is another reason why many analysts are Consequently, the West German government
underestimating the size and duration of shut down the research program.
the great uranium bull market. A major advantage of the PBMR is they are
The PBMR has attractive safety features. small and relatively cost-effective for
The coolant has no transition phases. The mass manufacturer. Industry insiders told
helium coolant remains as a gas, which is me the Chinese hope to mass market these,
inert and fireproof. Few neutrons are at some future time, for export around
absorbed so the coolant remains less the world. The South Africans already
radioactive. The moderator is solid plan to do so after building their first
carbon, does not act as a coolant and PBMR at Koeberg, South Africa (on the
does not have transitions as does light Atlantic coast about 18 miles from Cape
water in a conventional reactor. In an Town). France may have its first PBMR by
actual test, a pebble bed reactor had all 2020. Others may have one before then,
of its supporting machinery fail. The and many more should have the PBMR
reactor did not crack, melt, explode or afterward.






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