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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 Amund Geicke
The Rjukan Chain Google maps
The Rjukan Chain Norsk Hydro Dam Dale Såheim Dam Mæland Outlet Mæl Krokan Skarsfoss Vemork Inlet Mæl OutletMoflåt Frøystul InletMoflåt
Construction • Vemork 1911 • Såheim 1915 • Frøystul 1926 • Moflåt and Mæl 1952-57
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
The Vemork Raid(s) • Operations Grouse and Freshman, October 1942
The Vemork Raid • Operations Grouse and Freshman, October 1942
The Vemork Raid(s) • OperationGunnerside, February 1943
The Vemork Raid(s) • Bombing, November 1943 • 143 B-17's
The Vemork Raid(s) • Sinking of D/F Rjukan • Timed bomb
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.
Design basis • Operating time 20 years • Lowfocusonvisualappearance.
Scope 2012 Dam Dale Såheim Dam Mæland Outlet Mæl Krokan Skarsfoss Vemork Inlet Mæl OutletMoflåt Frøystul InletMoflåt
Skarsfoss 2 gates New dam Demolish dam 2014 Inlet tunnel to Vemork InletSkarsfoss
Inlet Skarsfoss - Damages Freezing/thawing and Cracking caused by alcali-aggregate reaction (AAR).
Inlet Skarsfoss - assessment • Coating will not stop AAR • The cracking will have very small consequencesthe next 20 years
Inlet Skarsfoss Original scope: • Mechanicalconcreterepairs. • Polyureaoneverything. Resultingscopeafterinspection: • Mechanicalconcreterepairs. • New structural elements.
Scope 2012 Dam Dale Såheim Dam Mæland Outlet Mæl Krokan Skarsfoss Vemork Inlet Mæl OutletMoflåt Frøystul InletMoflåt
Dam Krokan- Damages Freezing/thawing and cracking caused by AAR
Dam Krokan - assessment The structure does not have sufficient load bearing capasity.
Dam Krokan - Scope Original scope: • Mechanicalconcreterepairs. • Polyureaoneverything. Resultingscopeafterinspection: • New Dam Krokan.
Scope 2012 Dam Dale Såheim Dam Mæland Outlet Mæl Krokan Skarsfoss Vemork Inlet Mæl OutletMoflåt Frøystul InletMoflåt
Spillway wall - damages Leaching caused by poorly compacted concrete. Cracking from AAR Damages also downstream.
Spillway wall - assessment • Concrete of varying quality. Especially in the lower parts of the wall. • Difficult access downstream.
Spillway wall - Scope Original scope: • Mechanicalconcreterepairs. • Polyureaontheupstream side. Resultingscopeafterinspection: • New concretewallonthelower parts. • Mechanicalconcreterepairs. • Polyureaontheupstreamside.
Scope 2012 Dam Dale Såheim Dam Mæland Outlet Mæl Krokan Skarsfoss Vemork Inlet Mæl OutletMoflåt Frøystul InletMoflåt
Dam Mæland access to river Måna river Dam Mæland El. inst Såheim outlet Inletduct Gate housing InletMoflåt
Dam Mæland Dam, walls, bridge etc – Repairworks on all concretesurfaces and railings etc. Coffer dam Spillwaywall
Mæland - Bridge Damages: Rebar corrosion and freezing/thawing
Mæland - Bridge Original scope: • Mechanicalconcreterepairs. • Polyureacoatingontop. Resultingscopeafterinspection: • Mechanicalconcreterepairs. • Polyureacoatingontop.
Mæland - Pillars Damages: Cracking caused by AAR
Mæland - Pillars assessment: • Small consequencesof cracking onverticalsurfaces. • Coatingwill not stop AAR • Possibleincreased risk ofdamages from freezing/thawingwithcoating. • Damages have littleimpactontheloadbearingcapasity.
Mæland - Pillars Original scope: • Mechanicalconcreterepairs. • Polyureacoating. Resultingscopeafterinspection: • Mechanicalconcreterepairs. • Roof over horisontal surfaces. • Cleaning.
Mæland - Walls Damages: Cracking caused by AAR
Mæland - Walls assessment: • Small consequencesof cracking onverticalsurfaces. • Coatingwill not stop AAR • Possibleincreased risk ofdamages from freezing/thawingwithcoating. • Damages have littleimpactontheloadbearingcapasity.
Mæland - Walls Original scope: • Mechanicalconcreterepairs. • Polyureacoating. Resultingscopeafterinspection: • Mechanicalconcreterepairs. • Cleaningwith ultra highpressure. Removingoldcoating.
Mæland - Baseplate Damages: Cracking caused by AAR and Freezing/thawing
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.
Mæland - Baseplate Original scope: • Mechanicalconcreterepairs. Resultingscopeafterinspection: • New Baseplate
Mæland - Ducts Damages: Cracking caused by AAR
Mæland - Ducts assessment: • Small consequencesof cracking onverticalsurfaces. • Coatingwill not stop AAR • Possibleincreased risk ofdamages from freezing/thawingwithcoating. • Damages have littleimpactontheloadbearingcapasity.