Units
- G1, G2 and G3 at Marcoule. G1 was the first UNGG to go critical, in 1956.
- Chinon Nuclear Power Plant A1, A2, and A3 in Indre-et-Loire.
- Saint-Laurent Nuclear Power Plant A1 and A2 in Loir-et-Cher, operated from 1969 and 1971 to April 1990 and June 1992.
- Reactor 1 at Bugey Nuclear Power Plant in Ain, the last UNGG built in France, first criticality 1972, closed May 1994.
- Vandellòs Nuclear Power Plant Unit 1 in Spain, the only UNGG built outside France, closed July 1990.
The earlier units, at Chinon and Marcoule, had heat exchangers outside the main pressure vessel; Later units (Saint-Laurent, Bugey and Vandellos) moved these heat exchangers to inside the pressure vessel.
Read more about this topic: UNGG Reactor
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