Improved analytical methodology for calculation assessment of material parameters in the nuclear installation decommissioning process

Zachar, Matej; Daniska, Vladimir; Nečas, Vladimı́r

doi:10.1016/j.pnucene.2011.03.003

Cited by 17 publications

(3 citation statements)

References 3 publications

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“…Calculation of material and radiological parameters of conditionally released materials. The decommissioning planning code OMEGA (developed in the DECOM company) with newly implemented calculation stream evaluating the conditional release is used [9]. The necessary inputs for calculation are:…”

Section: Methodology For Scenarios Assessmentmentioning

confidence: 99%

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

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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].

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Section: Methodology For Scenarios Assessmentmentioning

confidence: 99%

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

“…In the OMEGA code, the standardized ISDC (International Structure for Decommissioning Costing) structure, issued by international organizations (IAEA, NEA/OECD, EC) as a tool systemizing the decommissioning cost items, is used for arranging all decommissioning activities included in the calculation. General purposes of ISDC structure are to facilitate communication, to promote uniformity, to avoid inconsistency or contradiction of results of costs evaluations and to be of worldwide interests to all decommissioners [2], [11].…”

Section: B General Description Of Omega Codementioning

confidence: 99%

Management of metallic radioactive materials from nuclear installations decommissioning

Nečas

2013

2013 4th International Youth Conference on Energy (IYCE)

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Basic characterization of the waste management process during decommissioning of nuclear installations is described in the presented paper. Conditional and unconditional releasing of radioactive materials into the environment (ENV) is described in detail. By conditional release, significant volumes of steel can be released and valuable space in repository can be saved as well as costs for processing of metals as radioactive waste. Metal melting as a prospective decontamination technique of radioactive scrap metal is described in detail. Metal melting provides high decontamination factors for several radionuclides. Using metal melting, significant amounts of steel can be decontaminated and released into the ENV for recycling and reuse. However, the dark side of this technology are high investment costs and high operational costs. The next chapter deals with the disposal of materials classified as radioactive wastes. In this chapter types of disposal facilities are briefly described.In the last part of this paper three scenarios related to conditional releasing of steel are described. Basic descriptions of each scenario and results for the most significant radionuclide are given.Index Terms-nuclear installation decommissioning, material release, metal melting, decontamination

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“…These tools are often structured according to the Work Breakdown Structure (WBS) approach [1,2]. Despite of this approach being adequate from the engineering point of view due to the high level of detail, its use require a very large database, previous experience in field or assumptions that not always represents the site characteristics, the process objectives or strategical planning of the operator, since the process beginning [1,2,[6][7][8][9][10][11]. On the other hand, the top-down approach requires a reduced quantity of data in the process beginning, despite some previous experience is still desirable, and thus, is preferable in the project beginning instead the bottom-up approach.…”

Section: Introductionmentioning

confidence: 99%

Decommissioning cost estimation for a multiple reactor site with interdependent plants: case study using a new management tool and top-down approach

2021

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In the end of operational life, a nuclear power plant should be decommissioned to release its site for a new purpose. The decommissioning cost estimation is part of the decommissioning plan, which also include the decommissioning strategy definition. The cost estimation is performed by management tools, most of them according the bottom-up approach. However, this approach usually requires large quantities of data and detailed knowledge of the site conditions and the project phases, which are often unknown in the project beginning, requiring the adoption of several assumptions. Otherwise, the top-down approach requires less data or assumptions, and the project details is known as it became mature. Due to this, the top-down approach is a better approach for cost estimation during planning phase than the bottom-up. Despite it, most part of management tools found in literature to cost estimation are structured according the bottom-up approach. To suppress this lack, recently a new management tool was developed according the top-down approach, being able to estimate the decommissioning cost of nuclear power plants for budget/bid purposes. This work aims to present the cost estimation to decommissioning a multiple reactor power site with similar characteristics of the Brazilian ones, which would be used as benchmark. The results demonstrated that the interdependencies among the plants are important and affects significantly the cost to decommissioning each plant. This work is part of a research that is under course in which several strategies alternatives would be evaluated.

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Improved analytical methodology for calculation assessment of material parameters in the nuclear installation decommissioning process

Cited by 17 publications

References 3 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

Management of metallic radioactive materials from nuclear installations decommissioning

Decommissioning cost estimation for a multiple reactor site with interdependent plants: case study using a new management tool and top-down approach

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