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A Famous Water Power plant in Rjukan

A Famous Water Power plant in Rjukan. Amund Geicke. The Rjukan Chain. Google maps. The Rjukan Chain. Norsk Hydro. Dam Dale. Såheim. Dam Mæland. Outlet Mæl. Krokan. Skarsfoss. Vemork. Inlet Mæl. Outlet Moflåt. Frøystul. Inlet Moflåt. The Rjukan Chain. Construction. Vemork 1911

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A Famous Water Power plant in Rjukan

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  1. A Famous Water Power plant in Rjukan Amund Geicke

  2. The Rjukan Chain Google maps

  3. The Rjukan Chain Norsk Hydro Dam Dale Såheim Dam Mæland Outlet Mæl Krokan Skarsfoss Vemork Inlet Mæl OutletMoflåt Frøystul InletMoflåt

  4. The Rjukan Chain

  5. Construction • Vemork 1911 • Såheim 1915 • Frøystul 1926 • Moflåt and Mæl 1952-57

  6. Why is it famous?

  7. History of the Vemork plant Among the worlds largest power plants in 1911. The Vemork factory in front of the power plant. From 1934 the factory produced heavy water

  8. The Vemork Raid(s) • Operations Grouse and Freshman, October 1942

  9. The Vemork Raid • Operations Grouse and Freshman, October 1942

  10. The Vemork Raid(s) • OperationGunnerside, February 1943

  11. The Vemork Raid(s)

  12. The Vemork Raid(s)

  13. The Vemork Raid(s)

  14. The Vemork Raid(s) • Bombing, November 1943 • 143 B-17's

  15. The Vemork Raid(s) • Sinking of D/F Rjukan • Timed bomb

  16. Back to the future… • Project initiated and planning startet in 2009. • Inspections and concrete sampling in 2011 and 2012. • Excecution of repair and construction works during production stops in the summer months of 2011-2014.

  17. Design basis • Operating time 20 years • Lowfocusonvisualappearance.

  18. Scope 2012 Dam Dale Såheim Dam Mæland Outlet Mæl Krokan Skarsfoss Vemork Inlet Mæl OutletMoflåt Frøystul InletMoflåt

  19. Skarsfoss 2 gates New dam Demolish dam 2014 Inlet tunnel to Vemork InletSkarsfoss

  20. Inlet Skarsfoss

  21. Inlet Skarsfoss - Damages Freezing/thawing and Cracking caused by alcali-aggregate reaction (AAR).

  22. Inlet Skarsfoss - assessment • Coating will not stop AAR • The cracking will have very small consequencesthe next 20 years

  23. Inlet Skarsfoss Original scope: • Mechanicalconcreterepairs. • Polyureaoneverything. Resultingscopeafterinspection: • Mechanicalconcreterepairs. • New structural elements.

  24. Scope 2012 Dam Dale Såheim Dam Mæland Outlet Mæl Krokan Skarsfoss Vemork Inlet Mæl OutletMoflåt Frøystul InletMoflåt

  25. Dam Krokan- Damages Freezing/thawing and cracking caused by AAR

  26. Dam Krokan- Damages

  27. Dam Krokan- Damages

  28. Dam Krokan - assessment The structure does not have sufficient load bearing capasity.

  29. Dam Krokan - Scope Original scope: • Mechanicalconcreterepairs. • Polyureaoneverything. Resultingscopeafterinspection: • New Dam Krokan.

  30. Scope 2012 Dam Dale Såheim Dam Mæland Outlet Mæl Krokan Skarsfoss Vemork Inlet Mæl OutletMoflåt Frøystul InletMoflåt

  31. Spillway wall - damages Leaching caused by poorly compacted concrete. Cracking from AAR Damages also downstream.

  32. Spillway wall - assessment • Concrete of varying quality. Especially in the lower parts of the wall. • Difficult access downstream.

  33. Spillway wall - Scope Original scope: • Mechanicalconcreterepairs. • Polyureaontheupstream side. Resultingscopeafterinspection: • New concretewallonthelower parts. • Mechanicalconcreterepairs. • Polyureaontheupstreamside.

  34. Scope 2012 Dam Dale Såheim Dam Mæland Outlet Mæl Krokan Skarsfoss Vemork Inlet Mæl OutletMoflåt Frøystul InletMoflåt

  35. Dam Mæland access to river Måna river Dam Mæland El. inst Såheim outlet Inletduct Gate housing InletMoflåt

  36. Dam Mæland Dam, walls, bridge etc – Repairworks on all concretesurfaces and railings etc. Coffer dam Spillwaywall

  37. Dam Mæland

  38. Mæland - Bridge Damages: Rebar corrosion and freezing/thawing

  39. Mæland - Bridge Original scope: • Mechanicalconcreterepairs. • Polyureacoatingontop. Resultingscopeafterinspection: • Mechanicalconcreterepairs. • Polyureacoatingontop.

  40. Mæland - Pillars Damages: Cracking caused by AAR

  41. Mæland - Pillars assessment: • Small consequencesof cracking onverticalsurfaces. • Coatingwill not stop AAR • Possibleincreased risk ofdamages from freezing/thawingwithcoating. • Damages have littleimpactontheloadbearingcapasity.

  42. Mæland - Pillars Original scope: • Mechanicalconcreterepairs. • Polyureacoating. Resultingscopeafterinspection: • Mechanicalconcreterepairs. • Roof over horisontal surfaces. • Cleaning.

  43. Mæland - Walls Damages: Cracking caused by AAR

  44. Mæland - Walls assessment: • Small consequencesof cracking onverticalsurfaces. • Coatingwill not stop AAR • Possibleincreased risk ofdamages from freezing/thawingwithcoating. • Damages have littleimpactontheloadbearingcapasity.

  45. Mæland - Walls Original scope: • Mechanicalconcreterepairs. • Polyureacoating. Resultingscopeafterinspection: • Mechanicalconcreterepairs. • Cleaningwith ultra highpressure. Removingoldcoating.

  46. Mæland - Baseplate Damages: Cracking caused by AAR and Freezing/thawing

  47. Mæland - Baseplate assessment: • Risk of full disintegrationof baseplate withinthenext 20 years. • The baseplate is critical for thefunctionofthesealinginjection screen. • Repaircostswill be almost as high as theconstructioncostof a newslab.

  48. Mæland - Baseplate Original scope: • Mechanicalconcreterepairs. Resultingscopeafterinspection: • New Baseplate

  49. Mæland - Ducts Damages: Cracking caused by AAR

  50. Mæland - Ducts assessment: • Small consequencesof cracking onverticalsurfaces. • Coatingwill not stop AAR • Possibleincreased risk ofdamages from freezing/thawingwithcoating. • Damages have littleimpactontheloadbearingcapasity.

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