Publicatie Laka-bibliotheek:
Too Hot to Handle. The truth about high burnup spent fuel
Auteur | Hugh Richards |
6-01-3-52-07.pdf | |
Datum | april 2008 |
Classificatie | 6.01.3.52/07 (VEILIGHEID - REACTOREN - NIEUWE GENERATIES - EPR) |
Opmerking | To boost the efficiency of nuclear reactors, operators have progressively enriched the uranium they use as fuel to increase its "burn-up" rate. This is a measure of the amount of electricity extracted from a given amount of fuel, and is expressed in gigawatt-days per ton of uranium (GWd/tU). The higher the burn-up, the longer the fuel rods can remain in the reactor. Since 1970, the average burn-up of these reactors worldwide has almost doubled, to more than 40 GWd/tU . The next generation of nuclear plants will bring a further step-change. Plans for the two designs most likely to be built in the U.S. and U.K. - Westinghouse's AP1000 and Areva's European Pressurised Reactor - envisage burn-up rates of 60 GWd/tU or more. At these rates, uranium fuel rods should burn for around a year longer than today's best burn-up fuel. |
Voorkant |
Uit de publicatie:
Hugh Richards BArch MA MRTPI April 10th 2008 Too Hot to Handle The truth about high burnup spent fuel The problem with deciding ‘in principle’ to support new nuclear power stations is that once the actual details emerge, however troublesome, the Government will remain committed, and will be inclined to ignore them. In advance of detailed examination of the proposals of the nuclear industry the Government has reasserted its belief that new nuclear power stations would pose very small risks to safety. In fact the entire public consultation exercise seems to have been designed to protect the nuclear industry from proper scrutiny, and this ‘keep it vague’ method is continuing. A good example is the way in which we as taxpayers are being ‘locked in’ to taking responsibility for the long-term management of highly radioactive waste from new nuclear power stations without any clear idea of the implications. The high burn up fuel proposed for new reactors uses more enriched uranium, and leaves it in the reactor for longer. This gets more output from the fuel, but increases the dangers of radioactive releases as the fuel cladding gets thinner. This increased danger persists throughout its storage and disposal. The Government says that before it grants consent for new nuclear reactors it “will need to be satisfied that effective arrangements exist or will exist to manage and dispose of the waste they will produce”. 1 This approach has been denounced by the International Atomic Energy Agency as ‘too vague to provide the required certainty’. In March 2007 the IAEA warned that Britain must not go ahead with a new generation of nuclear power stations until it has a "clear and robust" plan in place for dealing with the twin problems of decommissioning and waste treatment. The agency's executive director said: "The spent-fuel issue is the most critical one for nuclear. It will not develop if there is not a credible and satisfactory answer to the management of spent fuel and one which is convincing for the public." 2