Objective
Limiting values for the release of concrete with low-level residual radioactivity for the selective safe utilization (eg, for noise barriers, earth fill, earth bank or substitute for foundation material) are presently not defined. The research programme will examine whether it is possible to define limiting values for radioactively contaminated concrete in the range of the limiting values for steel. The effect of radioactively contaminated concrete on the soil (leach out of radionuclides) and on man (radiation exposure) will be determined.
The results of these studies will have an effect on the decommissioning activities as far as buildings of the controlled area and the kind and quantity of the radioactively contaminated concrete are concerned.
The advantage of the studies lies in an economic and safe recycling of large amounts of concrete with a low-level artificial residual radioactivity. Thereby, valuable ground storage space would be saved and natural gravel deposits would be preserved.
The research work will provide data concerning cost saving by recycling concrete from controlled areas, radiation exposure of the decommissioning workers and of the general public.
The research programme is performed in cooperation with CEA-IPSN, which has a research programme with a similar objective.
Limiting values for the release of concrete with low level residual radioactivity for selected safe utilisation (eg for noise barriers, earth fill, earth bank or substitute for foundation material) are presently not defined. The research programme will examine whether it is possible to define limiting values for radioactively contaminated concrete in the range of the limiting values for steel. The effect of radioactively contaminated concree on the soil (leach out of radionuclides) and on man (radiation exposure) will be determined.
The preparations and planning of the wash out tests were finished and the test stand in the nuclear power plant was completed. The tests have been started. Measurements of the test materials and first results of the wash out tests were obtained. The literature study concerning the wash out behaviour of concrete was completed. A literature study on the composition of natural rainwater was carried out. 20 samples of aged concrete and 52 samples of freshly poured concrete were collected and measured by gamma spectroscopy in order to determine the natural radioactivity of concrete. The literature study, performed in parallel to those activities, examining the natural radioactivity of concrete, was completed.
WORK PROGRAMME
1. Leach tests
1.1. Design of the test facility and determination of concrete test specimen. (all)
1.2. Construction and operation of the test facility. (TUV-Bay.)
1.3. Literature survey on leaching out problems of radionuclides in concrete. (TUV-Bay.)
1.4. Radiological measurements on concrete rubble before, during and after leach out tests. (TUV-Bay.)
2. Natural radioactivity in concrete
2.1. Procurement of samples from recently produced and aged concrete. (RWE)
2.2. Measurement of alpha, beta and gamma radiation. (TUV-Bay.)
2.3. Literature survey concerning the natural radioactivity of concrete.
3. Development of methods for recycling concrete.
3.1. Examination of concrete recycling possibilities by a literature study. (RWE)
4. Calculation of radiation exposure and determination of the artificial residual radioactivity
4.1. Determination of radiation exposure scenarios. (TUV-Bay.)
4.2. Calculation of radiation exposure for man due to natural and artificial radioactivity. (TUV-Bay.)
4.3. Derivation of criteria for the safe use of concrete with artificial radioactivity. (TUV-Bay.)
Fields of science (EuroSciVoc)
CORDIS classifies projects with EuroSciVoc, a multilingual taxonomy of fields of science, through a semi-automatic process based on NLP techniques. See: The European Science Vocabulary.
CORDIS classifies projects with EuroSciVoc, a multilingual taxonomy of fields of science, through a semi-automatic process based on NLP techniques. See: The European Science Vocabulary.
- engineering and technology environmental engineering waste management waste treatment processes recycling
- humanities languages and literature literature studies
- engineering and technology other engineering and technologies nuclear engineering
- natural sciences chemical sciences nuclear chemistry radiation chemistry
- natural sciences physical sciences optics spectroscopy
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Coordinator
80686 München
Germany
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