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Architectural, construction, engineering and inspection services

Nagra | Published December 2, 2016  -  Deadline January 4, 2017

Im Rahmen der Etappe 3 des SGT (Sachplan geologische Tiefenlager) sind für die gewählten geologischen Standortgebiete Modellierungen durchzuführen zu den durch die Lagerung hervorgerufenen Auswirkungen (thermal, mechanisch, Gase, chemisch) auf die Umgebung von Lagern für Hochradioaktive und Mittel- bis schwach radioaktive Abfälle (oder Kombilager).

Für weitere Informationen siehe englische simap Publikation mit der Meldungsnummer 939661.

Lager für hoch radioaktive Abfälle (HAA-Lager).

Lager für schwach und mittel radioaktive Abfälle (SMA).

The overall purpose of this assignment is to assess, for both repository types (HLW (Lot 1), L/ILW (Lot2), respectively), the impact of repository-induced effects on the long-term performance of the repository system. Special focus will be dedicated to the question, whether site specific aspects may exhibit a significant impact on the safety margins associated with the mitigation of repository-induced effects. Thus, a criteria-based indicator approach could be adopted to identify the most suitable repository site out of the three candidate siting areas (Jura Ost, Nördlich Lägern, Zürich Nordost).

The role of the repository-induced effects needs to be evaluated in this assignment by conducting thermo-hydraulic simulations of two phase flow and multi-component transport along the backfilled repository configurations and in the surrounding host rock in 2-D and 3-D model set-ups. The simulations will cover the whole lifecycle of the repository, including construction, operations period and post closure phase. Modelling of the early stages, when the open underground structures are ventilated, is aimed at providing the correct initial conditions for the simulations of the post closure phase. The repositories need to be modelled in sufficient detail so that the mass and heat flow, the gas pressure build-up, the saturation behaviour of the engineered barrier systems (EBS) materials and the host rock is characterized in detail and insight is gained with respect to the phenomena or aspects that increase the likelihood of compromising the safety functions of the engineered and geological barriers, respectively. Flow of gas and water along and around the backfilled underground structures and the host rock shall be characterized and quantified in detail during the construction and operational phase as well as post operational phase. In addition, the movement of volatile radionuclides in the gas phase needs to be modelled. The impact of thermal effects on the mechanical integrity of the host rock and the engineered barriers needs to be evaluated in the context of comprehensive stress path analyses.

The assignment will comprise four work packages to be executed in two phases. The first phase gives emphasis to the development of a basic work-flow for the intended phenomenological system analyses (Dry-Run, lasting from February 2017 to July 2018). Upon successful completion of the first phase, the second phase (August 2018 to December 2020) will be initiated with focus on the integration of new site-specific information in the modelling workflow.

Lot 1 comprises work packages WP1, WP2 and WP5a; Lot 2 comprises work packages WP3, WP4 and WP5b. The work packages for lot 1 comprise:

Lot 1:

— WP1 — HLW-SBI / Phenomenological system analyses in support of barrier integrity: Geoscientific analysis and interpretation of repository-induced effects (thermal, mechanical, gas-related and chemical impacts) in the underground structures of a HLW repository and in the host rock. The THM-C related analyses must allow conclusions for the whole spectrum of geological settings and repository configurations. The impact of conceptual and parametric uncertainties on the modelling results has to be addressed.

— WP2 — HLW-SFS / Safety-related model abstractions associated with the repository near-field: Geoscientific analyses and abstractions of repository-induced effects along the backfilled underground structures and in the host rock around the repository. The impact of conceptual and parametric uncertainties on the modelling results has to be addressed.

— WP5a — RIE-reference data sets and contribution to the RIE Synthesis Reports (Dry-Run): Development of general workflows for and indicator-based site selection process and for the elabora-tion of RIE reference data sets for HLW. Documentation of the achievements in technical documents which will be subjected to a comprehensive review process.

Lot 2:

— WP3 — L/ILW-SBI / Phenomenological system analyses in support of barrier integrity: Geoscientific analysis and interpretation of repository-induced effects (thermal, mechanical, gas-related and chemical impacts) in the underground structures of a L/ILW repository and in the host rock. The THM-C related analyses must allow conclusions for the whole spectrum of geological settings and repository configurations. The impact of conceptual and parametric uncertainties on the modelling results has to be addressed.

— WP4 — L/ILW-SFS / Safety-related model abstractions associated with the repository nearfield: Geoscientific analyses and abstractions of repository-induced effects along the backfilled underground structures and in the host rock around the repository. The impact of conceptual and parametric uncertainties on the modelling results has to be addressed.

— WP5b — RIE-reference data sets and contribution to the RIE Synthesis Reports (Dry-Run): Development of general workflows for and indicator-based site selection process and for the elabora-tion of RIE reference data sets for L/ILW. Documentation of the achievements in technical documents which will be subjected to a comprehensive review process.

Repositories for SF/HLW/ILW.

Repositories for L/ILW.

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