Publikationer

Din avgränsning ger 394 träffar.

• 2022:04 Warm Pre-Stressing mechanisms

  SSM perspective Background Swedish nuclear power plants (NPP) were originally designed and analyzed with an assumed operating period of approximately 40 years. As Swedish NPPs reach their original technical design life the safety of the additional operating time has to be verified. With increased operating time, the shift in the fracture toughness curve of the reactor pressure vessel (RPV)...

  Innehållstyp: Publikationer

• 2022:03 Effect of Neutron Irradiation on the Oxidation and Corrosion of Austenitic Stainless Steels

  SSM perspective Background Reactor pressure vessel internal components of austenitic stainless steel located close to the core are subject to a high neutron flux. Irradiation by fast neutrons induces changes in the material that affect microstructure, mechanical properties and microchemistry. These changes eventually lead to an increased susceptibility to irradiation assisted stress corrosion...

  Innehållstyp: Publikationer

• 2021:28 Analysis of Radon Levels in Swedish Dwellings and Workplaces

  SSM perspektiv Bakgrund Exponering för radon anses vara den viktigaste orsaken till lungcancer näst efter rökning och beräknas orsaka omkring 500 lungcancerfall årligen i Sverige. Därför är det viktigt att sänka radonhalten i inomhusluften, speciellt om nivån överstiger referensnivån 200 Bq/m³. För att kunna uppdatera beräkningar...

  Innehållstyp: Publikationer

• 2021:21 Region-specific radioecological evaluation of accidental releases of radionuclides from ESS

  SSM perspective Background To strengthen the material science research in Europe, the European Spallation Source (ESS) is being built in Lund in the southern part of Sweden. In the spallation process, neutrons are generated when the accelerated protons hit the tungsten target. In addition, a broad range of radioactive by-products are produced that differs from the fission products produced...

  Innehållstyp: Publikationer

• 2021:20 Effects of additives on UO2 fuel behavior: expanded edition

  SSM perspective Background The Swedish Radiation Safety Authority (SSM) follows the development of nuclear fuel closely. Fuel with additives like chromia and gadolinia is used in Swedish reactors and fuel with even better thermal and mechanical properties is under development. This project is an in-depth study of data and models regarding the impact of additives on the properties of uranium...

  Innehållstyp: Publikationer

• 2021:19 Importance Sampling Time-Domain Random Walk (ISTIDRAW) Version 1.0 User Guide A Code for Radionuclide Transport in Pathway Networks

  SSM perspective Background To support regulatory review of post-closure safety assessments of geological disposal systems it is of importance to possess regulatory independent modelling capacity. Typically, SSM’s independent modelling includes performing simple scoping calculations, utilizing the implementer’s own models with other equation solvers, or defining alternative conceptual...

  Innehållstyp: Publikationer

• 2021:14 Reliability, Feasibility and Significance of Measurements of Conductivity and Transmissivity of the Rock Mass for the Understanding of the Evolution of a Repository of Radioactive Waste

  SSM perspective Background The conducted research was part of the international research project DECOVALEX 2019 (DEvelopment of COupled models and their VALidation against EXperiments). DECOVALEX 2019 consisted of seven different research projects called Task A to G. SSM were involved in Task G, which were composed of three different teams from Technical University of Liberec (TUL),...

  Innehållstyp: Publikationer

• 2021:13 SSM’s external experts’ review of SKB’s safety evaluation SE-SFL

  SSM perspective Background In Sweden long-lived low- and intermediate level radioactive waste is planned to be disposed in a repository (SFL) in the Swedish crystalline rock at a depth around 500 m. The waste contains mainly the long-lived wastes from the operation and decommissioning of the Swedish nuclear reactor plants, as well as the long-lived wastes from early research in the Swedish...

  Innehållstyp: Publikationer

• 2021:10 Establishment and use of attention values in environmental fatigue assessments

  SSM perspective Background As Swedish NPPs reach their original technical design life, re-assessment of the fatigue life of structural components is needed for safe long term operation (LTO). In these re-assessments one must consider that new knowledge has shown that environmental effects on fatigue life must be considered. One common method to verify the fatigue life of structural components...

  Innehållstyp: Publikationer

• 2021:09 Mechanisms important for material modelling in weld residual stress analysis

  SSM perspective Background The prediction of weld residual stresses (WRS) is very complex as many mechanisms and phenomena influence the development of WRS during welding. For accurate prediction, the constitutive material models used are essential and must be able to describe the material response of the weldment constituents. For example, selection of a material model should only depend...

  Innehållstyp: Publikationer