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2 nd IMPACT WORKSHOP, Mo i Rana, Sept. 2002 Risk analysis Norwegian practice - new research

2 nd IMPACT WORKSHOP, Mo i Rana, Sept. 2002 Risk analysis Norwegian practice - new research by Grethe Holm Midttømme The Norwegian Water Resources and Energy Directorate (NVE). Photo: NVE. The Norwegian Water Resources and Energy Directorate (NVE). Norwegian practice

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2 nd IMPACT WORKSHOP, Mo i Rana, Sept. 2002 Risk analysis Norwegian practice - new research

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  1. 2nd IMPACT WORKSHOP, Mo i Rana, Sept. 2002 Risk analysis Norwegian practice - new research by Grethe Holm Midttømme The Norwegian Water Resources and Energy Directorate (NVE) Photo: NVE

  2. The Norwegian Water Resources and Energy Directorate (NVE)

  3. Norwegian practice • Development of RA for dams in Norway - brief overview • 1987: First project initiated by NVE and EBL (RA for 2 dams) • 1987-1995: A few projects on RA for dams, spillway gates and penstocks, among others a project on estimation and comparison of the probability of failure in large rockfill dams using event trees (Johansen et al. 1997, Hydropower’97) • 1995 - 2002: Several risk analyses performed, mostly probabilistic event tree analyses, e.g. RA of the rockfill dam Valldalen (Funnemark et al. 2000, Q.76, ICOLD congress Beijing) • Very few analyses include consequence analyses, i.e. assessment of probability of failure is emphasized G.H.Midttømme - 2nd IMPACT WORKSHOP, Mo i Rana, Sept. 2002

  4. Norwegian practice • Development of RA for dams in Norway - brief overview (continued) • In general: • Dam owners seem to use PRA’s mainly as a systematic way of identifying deficiencies and ranking safety improvements, e.g. as part of a dam safety reassessment • PRA methodology usually include: site inspections, hazard identification, construction of event trees, probability assessment (statistics and engineering judgment) and evaluation of results • A method for consequence analysis adapted to Norwegian conditions has been developed (Funnemark et al. 1998, ICOLD European Symposium on Dam Safety in Barcelona 1998) G.H.Midttømme - 2nd IMPACT WORKSHOP, Mo i Rana, Sept. 2002

  5. Norwegian practice • Regulations and guidelines • Revision of the first dam safety guidelines (1981) included a working group on risk analysis and emergency action planning • 1997: Guidelines on application of RA for dams (NVE) • 1999: Guidelines on the use of PHA for emergency planning (EBL) • 2001: New regulations on dam safety (§2.8 - NVE may demand risk analyses conducted by the responsible dam owner) • 2001: Practical guidelines describing how to perform event tree and fault tree analyses (EBL) G.H.Midttømme - 2nd IMPACT WORKSHOP, Mo i Rana, Sept. 2002

  6. Norwegian practice Regulations and guidelines (continued) There are plans for developing new guidelines on application of RA (NVE) -> focus will probably be on qualitative methods and analyses for EAP Planned ICOLD-bulletin on Risk Assessment in Dam Safety Management and ongoing projects related to risk analysis will be looked at G.H.Midttømme - 2nd IMPACT WORKSHOP, Mo i Rana, Sept. 2002

  7. New research • Recent dr.ing. studies at the Norwegian University of Science and Technology (NTNU), Trondheim • Hilde Marie Kjellesvig: Dam Safety - The Passage of Floods that Exceed the Design Flood, Thesis published July 2002 • Parts of the research work has been done in close cooperation with the project ”Stability and Breaching of Embankment Dams” • Grethe Holm Midttømme: Flood Handling and Emergency Action Planning for Dams, June 2002 G.H.Midttømme - 2nd IMPACT WORKSHOP, Mo i Rana, Sept. 2002

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