Radiation impact of very low level radioactive steel reused in motorway tunnel constructions

The nuclear installation decommissioning process is characterized by production of large amount of radioactive materials to be managed. The materials with radioactivity slightly above the unconditional release levels could be released conditionally for a specific industrial application in accordance with beforehand developed and evaluated scenario. This evaluation has to ensure that the limits for radiation exposure of workers and the public will not be exceeded. The paper gives an overview of representative options (scenarios) for reuse of conditionally released steel materials and recycled concrete from decommissioning. The main aim of the paper is to present the developed complex methodology for assessment of these options and its implementation to the relevant calculation tools. The first step in the methodology procedure is the identification of the activities which could lead to the exposure of the public or workers. For defined activities the external exposure of workers and the public is evaluated using the Visiplan 3D ALARA Planning tool. The internal exposure analysis is mainly based on the models for migration of radionuclides in the environment calculated in the GoldSim code. Based on the results of exposure evaluation, the critical exposure pathway is determined and conditional release levels of individual radionuclides are derived. Finally the amount and radioactivity of materials from decommissioning, fulfilling the limits for conditional reuse, are calculated in the decommissioning planning code OMEGA [1].

show abstract

“…The results for some of them could be found also in other papers presented in the ICRS-12 conference [7,10,11].…”

Section: Preliminary Results Of Evaluationsupporting

confidence: 61%

Assessment of potential options for conditional reuse of materials from nuclear installation decommissioning

Zachar

Daniska

Ondra

et al. 2014

Progress in Nuclear Science and Technology

Self Cite

View full text Add to dashboard Cite

show abstract

“…reach very high values comparing to the legislation. In case of these radionuclides it is expected that they will be limited in short-term, for example during melting process or building of construction [7]. Mentioned processes are out of scope of this paper.…”

Section: Resultsmentioning

confidence: 99%

Long-term radiation impact of conditionally cleared radioactive material from decommissioning of nuclear power plants reused in building industry

Panik

Nečas²

2014

Progress in Nuclear Science and Technology

Self Cite

View full text Add to dashboard Cite

In the process of decommissioning of nuclear facilities there is produced a lot of material with various levels of radioactivity. Large portion of the material could be conditionally cleared as an alternative to the treatment and disposal of this material as radioactive waste. Idea of conditional clearance is to facilitate the reuse of material with the radioactivity slightly above legislation limits of specific activity valid for unconditional clearance into the environment keeping dose criteria for the public. The radiation impact of cleared materials can be divided into short-term and long-term impact. Long-term radiation impact consists of inhalation or ingestion of radionuclides and external irradiation from the contaminated soil or dust. Transport of radionuclides from the conditionally cleared materials through the subsoil or waterways and subsequent intake of these radionuclides by humans was simulated and calculated using GOLDSIM software. Calculated models represent situations and geometries of the most probable future applications of conditionally cleared materials in building constructions. Output parameters are the clearance levels of radionuclides in conditionally cleared materials relevant to the legislation dose criteria (10 or 50 µSv/year) -the maximum clearable specific activity of radionuclides in the material from the dose point of view.

show abstract

Radiation impact of very low level radioactive steel reused in motorway tunnel constructions

Cited by 2 publications

References 2 publications

Assessment of potential options for conditional reuse of materials from nuclear installation decommissioning

Assessment of potential options for conditional reuse of materials from nuclear installation decommissioning

Long-term radiation impact of conditionally cleared radioactive material from decommissioning of nuclear power plants reused in building industry

Contact Info

Product

Resources

About