Romania operates a single CANDU type nuclear reactor, Cernavoda-1, which has operated since 1996.
The reactor has been a spectacular success, operating with a capacity utilization of over 90%, and producing electricity at some of the lowest operating and maintenance costs in Europe, about 1.25 US cents/kw-hr. Each year, the reactor prevents the release of 4 million tons of carbon dioxide.
An interesting feature of the reactor, uncommon among the world's 440 reactors, is the use of the waste heat from the nuclear plant for district heating, meaning that the reactor is a "co-generation" facility. As climate change proceeds, should rationality begin to become popular, one hopes that such "co-generation" opportunities will become more common. (Many old Soviet reactors also had this feature.)
The reactor produces between 10 and 12 percent of Romanian electricity.
Next year, in 2007, a second reactor, partially financed by the European Union, Italy, Canada and the United States will be completed.
Originally 5 reactors were planned at the site, but for financing reasons, construction of four of them were stopped for a time. Of the restarted completion of the other 4, only reactor #2 is nearing completion. The reactors were originally planned under the criminal dictatorship of Nicolae Ceaucescu, who not only severely repressed his people, but also bankrupted his country.
However, as Europe comes to grip with the realities of global climate change, and recognition increases of the unavoidable fact that global climate change cannot be slowed without the use of nuclear power, plans have been announced to complete all 5 reactors by 2020, should global climate change not more completely destroy the global economy before then than Nicolae Ceaucescu destroyed the Romanian economy. Europe never abandoned Hitler's Volkswagen, and neither should it abandon Ceaucescu's reactors.
Plans are now afoot to complete Cernovada-3 and Cernovada-4 by 2014, and Cernovada-5 by 2020.
The presence of 5 CANDU type reactors in Europe will have interesting implications in the internationalization of the nuclear fuel cycle, which all rational persons who are invested in peace support. Although CANDU reactors both in theory and practice can be used to make weapons grade plutonium of high isotopic purity - they are the most suitable
commercial reactor types for such use - they can also be employed in such a way as to destroy plutonium as an element of the thorium cycle. In this approach, weapons grade plutonium is denatured in such a way as to make the plutonium more difficult to handle and to cause any weapons containing such plutonium to "fizzle," giving a very low, if any, yield. If uranium is recycled in these reactors, the uranium can be rendered so denatured that it will be ineffective for use in enrichment plants, and incapable of being used for the purpose of making weapons grade uranium. In contrast to natural uranium, which contains on 3 isotopes, one of which, U-234 is present as an equilibrium trace, CANDU recycled plutonium could consist of 6 isotopes, including significantly larger amounts of U-234, as well as the unnatural isotopes U-232, U-233, and U-236. The latter isotope, U-236, will mean that any attempt to make weapons grade plutonium from that uranium would effectively fail, since large amounts of the heat generting Pu-238 would be formed at the same time. U-232 makes it difficult to handle the uranium nuclear fuel, making unauthorized diversion very problematic. This uranium would completely stymie any enrichment facility seeking to make bomb grade uranium. :-) Under thorium cycle conditions, the CANDU can operate as a breeder reactor, creating slightly more fissionable nuclear fuel than it consumes, further extending nuclear resources for many centuries. One element of nuclear control that may be available in future centuries would involve the admixture of CANDU treated uranium with virgin uranium obtained from seawater and mineral sources.
Like many technologies, the ultimate use of CANDU technology will represent a moral decision. By itself the technology is neither ideal or disasterous; it can be either depending on who is using it.
Thus under close supervision of international authorities, the CANDU is an important element of world nuclear technology that can play a critical role in peace, security, and the important fight against climate change. I hope these reactors will be well integrated into the European nuclear infrastructure and will be used to manage and reduce plutonium inventories, particularly those associated with military use.
More details about the Romanian nuclear program can be found here:
http://www.world-nuclear.org/info/inf93.htmhttp://www.reachingcriticalwill.org/about/pubs/Inventory/Romania.pdf