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  • 2008:30 A model for fission gas release from mixed oxide nuclear fuel

    SKI Perspective 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 ... natural uranium are the Pu-producing U-238. In fact, programs for using MOX were developed in the 1970´s to meet the feared or anticipated scarce supply of uranium at moderate prices. Although uranium prices...

    Innehållstyp: Dokument
  • 2007:33 Analys av mänsklig tillförlitlighet HRA-begreppets tillämpbarhet vid revisionsavställning

    perspective focusing on the interaction between aspects of Man, Technology and Organization (MTO) emerged in addition to the development of Human Factors knowledge. To take the human influence on the technical ... performed in rotating 3-shifts, around the clock, as well as many of the persons performing work tasks on the plant being external contractors. The working conditions are characterised by stress due to heat...

    Innehållstyp: Dokument
  • 2007:16 Hantering av händelser, nära misstag

    the reporting system is mentioned, the focus lies more on analysis than on the problem with the willingness to report. Even when the focus is on reporting it is often dealing with the design of the actual ... The cornerstone of a high willingness to report is the creation of a “no-blame” culture. Based on experience it can be concluded that the question whether a report could lead to personal reprisals...

    Innehållstyp: Dokument
  • 2007:43 ProLBB - A Probabilistic Approach to LeakBefore Break Demonstration

    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 plant. ... detectable leak and pipe rupture. The research project presented in this report provides information on failure probabilities for both leak and rupture for pipes of different sizes in Swedish BWR- as well...

    Innehållstyp: Dokument
  • 2007:08 DECOVALEX-THMC - Task B

    respectively, in order to observe the mechanical effects of saturation by different chemical fluids on the mechanical properties of the intact core samples. . In order to understand the physical-chemical ... respectively, in order to observe the mechanical effects of saturation by different chemical fluids on the mechanical properties of the intact core samples. . In order to understand the physical-chemical...

    Innehållstyp: Publikationer
  • 2007:05 Development of an Input Model to MELCOR 1.8.5 for Oskarshamn 3 BWR

    Perspective Background Assessments of the source term for Swedish nuclear power reactors are based on calculations made by means of the severe accident analysis code MAAP. This code was developed for ... the modelling work and the various files which comprise the input deck. Input data are mainly based on original drawings and system descriptions made available by courtesy of OKG AB. Comparison and check...

    Innehållstyp: Dokument
  • 2007:30 Modelling the Interaction of Low pH Cements and Bentonite

    project is to perform preliminary modelling to investigate the potential impacts of low pH cement water on bentonite. The evolution of a bentonite sample under the influence of several invading cement porewaters ... time- dependent leaching of the cement by the natural groundwater and will give a more realistic bound on the extent of the possible interaction. There are also considerable uncertainties concerning the precise...

    Innehållstyp: Dokument
  • 2007:20 Internationellt samarbete inom OECD/NEA 2006 avseende nukleär kriticitetssäkerhet

    Uppdraget har syftat till att delta i möten och tillhörande arbete som organiseras av NSC:s Working Party on Nuclear Criticality Safety och anknytande expertgrupper. Uppdraget omfattar arbete rörande utbränningskreditering ... 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...

    Innehållstyp: Dokument
  • 2007:42 Regleringen av matarvattenflödet i en PWR - Med exempel från Ringhals 3

    sägas vara representativ även för övriga svenska tryckvatten- reaktorer. Analysresultaten visar att R3:s reglering fungerar väl och tyder på att man inte har de problem som avses ovan. Vissa förbättringsmöjligheter ... snabbast med tidskonstanten 13 s. Stegsvarstesterna påvisar att reglersystemet ifråga är stabilt utan översväng eller oscillation. Nivåregleringen reagerar med tidskonstanten 60 s vid stegsvarstest med liten...

    Innehållstyp: Dokument
  • 2007:42 Regleringen av matarvattenflödet i en PWR - Med exempel från Ringhals 3

    sägas vara representativ även för övriga svenska tryckvatten- reaktorer. Analysresultaten visar att R3:s reglering fungerar väl och tyder på att man inte har de problem som avses ovan. Vissa förbättringsmöjligheter ... sägas vara representativ även för övriga svenska tryckvatten- reaktorer. Analysresultaten visar att R3:s reglering fungerar väl och tyder på att man inte har de problem som avses ovan. Vissa förbättringsmöjligheter...

    Innehållstyp: Publikationer