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2010:45 Evaluation of models for cyclic plastic deformation – A literature study
Analysis of nuclear components subjected to cyclic plastic deformation is normally based on the American standard ASME III. With the focus to improve the modeling of the stress-strain response under non-monotonic loading, several models for the analysis of cyclic plastic deformation have been developed in recent years. However, experience shows that the analysis and evaluation of plastic...
Innehållstyp: Publikationer -
2009:38 Research and Development Program in Reactor Diagnostics and Monitoring with Neutron Noise Methods, Stages 14 and 15
This report constitutes Stages 14 and 15 of a long-term research and development program concerning the development of diagnostics and monitoring methods for nuclear reactors. Stage 14 was a full one-year project, whereas Stage 15 consisted of a half-year project. Results up to Stage 13 were reported in SKI reports, as listed below and in the Summary. The results have also been published in...
Innehållstyp: Publikationer -
2009:16 Influence of Hardening Model on Weld Residual Stress Distribution
Weld residual stresses 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 of these events is important in order to arrive at proper conclusions when assessing detected flaws, for inspection planning and for assessment of leak-before-break margins. Therefore, it is very important to have...
Innehållstyp: Publikationer -
SSM Report 2008:01 A combined deterministic and probabilistic procedure for safety assessment of components with cracks – Handbook
SSM has supported research work for the further development of a previously developed procedure/handbook (SKI Report 99:49) for assessment of detected cracks and tolerance for defect analysis. During the operative use of the handbook it was identified needs to update the deterministic part of the procedure and to introduce a new probabilistic flaw evaluation procedure. Another identified need...
Innehållstyp: Publikationer -
2008:30 A model for fission gas release from mixed oxide nuclear fuel
Nuclear fuel containing mixed oxide (MOX) pellets have been used since the 1960's. MOX fuel pellets are made from a mixture of uranium and plutonium oxide. MOX allows the large quantities of fissile isotopes produced and remaining in spent nuclear fuel from light water reactors to be recycled. Producing MOX fuel can be seen as a method to more efficiently use the natural uranium since...
Innehållstyp: Publikationer -
2007:43 ProLBB - A Probabilistic Approach to LeakBefore Break Demonstration
The SKI regulation SKIFS 2004:2 allows for the use of Leak Before Break (LBB) as one way to provide assurance that adequate protection exists against the local dynamic consequences of a pipe break. The way to demonstrate that LBB prevails relies on a deterministic procedure for which a leakage crack is postulated in certain sections of the pipe based on the leak detection capability of the...
Innehållstyp: Publikationer -
2007:20 Internationellt samarbete inom OECD/NEA 2006 avseende nukleär kriticitetssäkerhet
Deltagande i internationellt samarbete inom OECD/NEA:s Nuclear Science Committee och dess Working Party on Nuclear Criticality Safety har fortsatt under 2006 med stöd av SKI. Inga stora projekt där jag varit mycket aktiv har pågått. Däremot har jag deltagit i arbetet genom granskning av förslag till slutrapporter, vid bedömning av nya projekt samt i fortsatt...
Innehållstyp: Publikationer -
2006:15 Säkerhets- och strålskyddsläget vid de svenska kärnkraftverken år 2005
Den säkerhetsfilosofi som Statens kärnkraftinspektion, SKI grundar sin tillsyn på förutsätter att det ska finnas flerfaldiga fysiska barriärer och ett till varje anläggning anpassat s.k. djupförsvar och att tillstädshavaren tar det odelade ansvaret för säkerheten. De fysiska barriärerna är placerade mellan det radioaktiva materialet...
Innehållstyp: Publikationer -
2006:19 CCF-hantering vid beräkningar i grund PSA och PSA tillämpningar
Per Hellström SKI Svenska...
Innehållstyp: Publikationer -
2006:24 Crack Characterisation for In-service Inspection Planning An Update
The need to qualify non-destructive testing systems (NDT systems) for pre- and in-service inspection has been recognised to a greater or lesser extent for many years in many countries engaged in nuclear power generation. However, NDT in general and qualification of NDT systems in particular are multidisciplinary and complex tasks. Development of NDT systems and demonstration of their...
Innehållstyp: Publikationer