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Improved Nuclear SIte characterization for waste minimization in DD operations under constrained EnviRonment

Periodic Reporting for period 2 - INSIDER (Improved Nuclear SIte characterization for waste minimization in DD operations under constrained EnviRonment)

Reporting period: 2018-12-01 to 2020-05-31

The INSIDER EURATOM european project aims at improving the management of contaminated materials arising from Decommissioning and Dismantling (D&D) operations for a global reduction of the volume of waste. It supports an integrated radiological characterization methodology, under waste-led consideration. The methodology is based on advanced statistical processing and modelling, coupled with adapted and innovative measurement methods, with respect to sustainability and economic objectives. The heart of innovation is driven by the sampling strategy methodologies.
In order to achieve these objectives, the approaches are qualified through three case studies, in the form of bechmarking. The monitoring of this benchmark and associated sampling design were established during the second period of the project. The metrological support to this experimental validation is based on different interlaboratory comparisons (ILC) to assess the proficiency of the labs, the performance of the methods and the uncertainties of the results. This second period of the project was mainly devoted 1) to the definition, organisation and processing of the in situ intercomparison campaigns 2) to synthetic certified reference material and real reference materials fabrication to be sent to the participating labs to ILC, 3) to the organisation of the different ILC themself. The result dissemination is carried out in parallel through the Knowledge platform, trainings, workshop, critical overview of standards.
In WP1 deals with the overall scientific coordination and project management. The WP1 activities were dedicating to ensuring communication within the consortium towards the project objectives, maintaining the projects management tools developed in the initial phase of the project and organising several meetings. Collaboration between partners remain active and results were shared notably throughout the platform. Executive Committee meetings were regularly organised. The reporting obligations toward the European Commission are followed up in this work package

WP2 deals with Requirement and Validation and most of the effort was dedicated during the first reporting period tasks 2.1 2.2 2.3 and 2.5 have been completed. In task 2.4 (evaluation methodology) aiming to the organisation of the benchmark exercise, is ongoing: deliverables D2.3 and D2.5 have been issued, so the current task is only monitoring the correct execution of the benchmark.

In WP3, Analysis of the statistical approach status, followed by further development and implementation (tasks 3.1 & 3,2) have already been completed in the previous reporting period (D3.1 D3,2, D3.3 & MS4). At present, also the statistical approach has been implemented in the three use case as far as currently possible (task 3.3 D3.4 D3.5 D3.6 & MS5). The first actions to draft the statistical approach guideline (task 3.4 D3.7) have been initiated.

In WP4, A report on radiochemical methods and capabilities (D4.1) and development of a radiochemical microsystem (D4.2) was completed in the first reporting period. Publications on both deliverables were produced in the second reporting period. Two reference materials have been developed (D4.3) by NPL and CMI, and distributed to participating laboratories as part of the inter-laboratory comparison in WP6. Real concrete material from UC2 has been processed by NPL and sent to participating laboratories.

WP5 deals with in-situ measurements; inventory of exiting methodologies for these task and the classification and categorization of the constrained environments appearing in nuclear/radioactive facilities have been carried out (D5.1 and D5.2) together with the inventory of the companies working on D&D processes in EU. Participation in UC1 and UC2 intercomparison campaigns with and evaluation of the equipment/methodologies suitability has been accomplished. D5.3 is in process.

WP6 deals with performance assessment and uncertainty evaluation and most of the effort was dedicated during this reporting period to the organization of comparisons (on CRM and on real samples samples, in situ or in laboratory) developed in this project (DL6.1 and DL6.2 concerning this organization are achieved). Statistical analyses of comparisons are in progress, synthesis of the BR3 in situ comparison is almost complete. Task 6.3 concerning the uncertainty budget started out well.

WP7 Supporting the EUG assessment, implementing the INSIDER Knowledge Platform extracting, editing and documenting all the knowledge generated by the project. A mapping of existing standards established being a key for establish a common methodologies to deploy reference guidelines. The dissemination activities included the organization of workshops, participation in conferences and the publication of 10 articles. A training course on Metrology was organised. Communication activities continued.
The radiological characterization of a facility prior to performing any D&D and remediation operations is a crucial step in the definition of a viable decommissioning scenario. This scenario must be robust and optimized not only with regards to technical issues, produced waste amount and workers dosimetry, but also with regards to costs, deadlines and safety. Today, information can be gained from the reconstitution of a 3D vision of a facility or of the components to be characterized. The INSIDER project focus on radiological characterization, including the sampling strategy and sampling design, through waste-led integrated approaches
In constrained environment based on the present methodology feedback, progress in terms of sampling strategy approaches was identifed. The heart of the technical innovative part of the project is to improve the sampling strategy taking into account different types of measurement data, with different but known levels of accuracy. To face the problem of radiological characterization in constrained environments, where very limited amount of available data is particularly challenging, and specific statistical strategy are implemented in order to limit the variability and sensibility to outliers.The INSIDER consortium has took up the challenge of coupling remote laboratory analysis and in situ measurement for statistical modelling by a metrological approach to qualify the integrated methodology with application to real projects representative of the identified use cases . Real reference materials and matrix representative synthetic certified reference materials are not availble and were fabricated within the project to meet the needs interlaboratory comparisons (ILC). Innovative interteam comparison of in situ measurements were organized leading to realistic assesments of atteignable performance and uncertainty sources. The next step of in lab ILC on CRM and real RM is essential to determine intrinsic performance of the methods and finalize the coupling between in situ and in lab measurements on real samples. The results of the experimental benchmarking will now structures the validation and refinement of the INSIDER methodology.
The mapping of existing standards and guides is the basis for a relevant and appropriate deployment of the pre-normative guides and texts that will be produced in the last phase of the project.
3 uses cases - associated benchmarking methodology