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Din avgränsning ger 539 träffar.

• 2017:25 Evaluation of weld fatigue reduction in austenitic stainless steel pipe components

  Background The performed investigation is a continuation of the work performed in SSM 2015:38 where fatigue tests were performed on pressurized welded austenitic stainless steel piping components. The ... to a realistic variable amplitude loading with mainly reversed bending deformation and particular focus on high cycle fatigue. The previous fatigue results were quite dependent on the estimation of the...

  Innehållstyp: Publikationer

• 2015:04 DiD-PSA: Development of a Framework for Evaluation of the Defence-in-Depth with PSA

  interpretation of the definitions of Defence in Depth given by IAEA which outline a framework to meet PSA. For each level of defence and combinations of levels, methods to give estimates from a PSA perspective ... the discussion of the basic definitions and the basis for defence-in-depth, as defined by IAEA, leading to somewhat modified and further developed definitions that support the link to a developed PSA.

  Innehållstyp: Publikationer

• 2013:01 Validation of Weld Residual Stress Modeling in the NRC International Round Robin Study

  Weld residual stresses (WRS) have a large influence on the behavior of cracks growing under normal operation loads and on the leakage flow from a through-wall crack. Accurate prediction on weld residual ... when cracks in weld joints are detected. During the latest years, there has been a strong development in both analytical procedures to numerically determine WRS and experimental measurements of WRS. The USNRC...

  Innehållstyp: Publikationer

• 2014:28 Numerical simulation of ductile crack growth in residual stress fields

  The study has shown on the capability of the cell model in capturing the effects on ductile tearing from limited pre-load levels and a residual stress field. Some of the conclusions are as follows: No distinctive ... compressive, at room temperature of 1.5 or 3 % total strain. The cell model gives good predictions of the experimentally generated JR-curves for pre-load levels up to 3% in compression and tension. As for...

  Innehållstyp: Publikationer

• 2008:50 Study on Developments in Accident Investigation Methods: A Survey of the “State-of-the-Art”

  The objective of this project was to survey the main accident investigation methods that have been developed since the early or mid-1990s. The motivation was the increasing frequency of accidents that ... that defy explanations in simple terms, for instance cause-effect chains or “human error”. Whereas the complexity of socio-technical systems is steadily growing across all industrial domains, including nuclear...

  Innehållstyp: Publikationer

• 2011:29 Research and Development Program in Reactor Diagnostics and Monitoring with Neutron Noise Methods, Stage 17

  constitutes Stage 17 of a long-term research and development program concerning the development of diagnostics and monitoring methods for nuclear reactors. Results up to Stage 16 were reported in SKI and SSM reports ... as listed below and in the Summary. The results have also been published in international journals and have been included in both licentiate- and doctor’s degrees. The objective of the research program...

  Innehållstyp: Publikationer

• 2011:33 Mathematical modelling of ultrasonic testing of components with defects close to a non-planar surface

  that has been performed in order to model ultrasonic testing of components that contain a defect close to a non-planar surface. The studies have been performed in both 2D and 3D, and in 2D in both the anti-plane ... anti-plane (SH) and the in-plane (P-SV). The results show that the presence of a non-planar back wall can reduce the detectability of defects close to the surface. The results show that the corrugated interface...

  Innehållstyp: Publikationer

• 2016:31 Measures and method characteristics for early evaluation of safe operation in nuclear power plant control room systems

  there is a need to develop evaluation methods in parallel with the development of control rooms in conjunction with construction modifications and other changes. This includes more indepth analysis of the methods ... conventional methods of evaluating control rooms and issues need to be reexamined. SSM has previously provided funding for several individual research projects regarding evaluation of control rooms. Both...

  Innehållstyp: Publikationer

• 2012:50 Fatigue Margins for Austenitic Stainless Steels in ASME Boiler and Pressure Vessel Code – A Literature Study

  Knowledge about the margins against fatigue failure in nuclear piping systems is essential. Therefore, the margins in the ASME Boiler and Pressure Vessel Code (section III) fatigue design procedure for ... investigated in this literature study. It is concluded that the current knowledge about the margins in ASME for realistic austenitic steel components is limited, since experimental evaluations of these margins...

  Innehållstyp: Publikationer

• 2009:22 Alternative modelling of brittle structures in a sub-area of the SKB candidate area at Forsmark, eastern Sweden

  A reasonable understanding of the character of the bedrock hosting a deep geological repository, i.e. the natural barrier, is an important component in the safety assessment of the deep geological repository ... structures in the rock, together with the regional stress field, affect the mechanical stability of the bedrock and the ground water transport within the bedrock. The rock types, the alteration of the bedrock...

  Innehållstyp: Publikationer