Nuclear decommissioning: Wikis


Note: Many of our articles have direct quotes from sources you can cite, within the Wikipedia article! This article doesn't yet, but we're working on it! See more info or our list of citable articles.


From Wikipedia, the free encyclopedia

Example of decommissioning work underway.
The reactor pressure vessel being transported away from the site, which will be buried. Images courtesy of the NRC.

The decommissioning of nuclear power plants is sometimes referred to as nuclear decommissioning, to mark the difference between 'conventional' decommissioning and dismantling projects. The main difference to the dismantling of a 'conventional' facility is the possible presence of radioactive or fissile material in a nuclear facility, that requires special precautions.

Generally speaking, nuclear plants were designed for a life of about 30 years. Newer plants are designed for a 40 to 60 year operating life.

Decommissioning involves many administrative and technical actions. It includes all clean-up of radioactivity and progressive demolition of the plant. Once a facility is decommissioned, there should no longer be any danger of a radioactive accident or to any persons visiting it. After a facility has been taken out of service it allows its release from regulatory control and relieves the licensee of his responsibility for its nuclear safety.


Decommissioning options

The International Atomic Energy Agency has defined three options for decommissioning, the definitions of which have been internationally adopted:

  • Immediate Dismantling (or Early Site Release/Decon in the US): This option allows for the facility to be removed from regulatory control relatively soon after shutdown or termination of regulated activities. Usually, the final dismantling or decontamination activities begin within a few months or years, depending on the facility. Following removal from regulatory control, the site is then available for re-use.
  • Safe Enclosure (or Safestor(e)): This option postpones the final removal of controls for a longer period, usually in the order of 40 to 60 years. The facility is placed into a safe storage configuration until the eventual dismantling and decontamination activities occur.
  • Entombment: This option entails placing the facility into a condition that will allow the remaining on-site radioactive material to remain on-site without the requirement of ever removing it totally. This option usually involves reducing the size of the area where the radioactive material is located and then encasing the facility in a long-lived structure such as concrete, that will last for a period of time to ensure the remaining radioactivity is no longer of concern.


A wide range of nuclear facilities has been decommissioned so far. This includes nuclear power plants (NPPs), research reactors, isotope production plants, particle accelerators, uranium mines etc. However, the number of decommissioned power plants is fairly small. There are companies specialized in nuclear decommissioning; the practice of decommissioning has turned into a profitable business. Decommissionning is very expensive; the current estimate by the United Kingdom's Nuclear Decommissioning Authority is that it will cost at least £70 billion to decommission the existing United Kingdom nuclear sites; this takes no account of what will happen in the future. Also, due to the latent radioactivity in the reactor core, the decommissioning of a reactor is a slow process which has to take place in stages; the plans of the Nuclear Decommissioning Authority for decommissioning reactors have an average 50 year time frame. The long time frame makes reliable cost estimates extremely difficult. Excessive cost overruns are not uncommon even for projects done in a much shorter time.

Nuclear Decommissioning in the American continent

The Pickering Nuclear Generating Station, viewed from the west. All eight reactors are visible, from 2.5km to 3.25km away.

Several nuclear reactors dismantled in America, type, power and decommissioning cost (often is mentioned only the probable cost per kilowatt of power: [1], [2], [3].

Country: Location: Reactor type: Operative life: Decommissioning
Canada (Québec) Gentilly-1 CANDU-BWR
250 MWe
180 days
(between 1966 and 1973)
"Static state" since 1986 [4] [5] [6] stage two:
US $ 25 Million
Pickering NGS
-A2, A3
8 x 542 MWe
30 years
(from 1974 to 2004)
Currently in "cold standby"
Decommissioning in 2012?
$ 270-430/kWe ?)
USA Fort St. Vrain HTGR
380 MWe
12 years
Immediate Decon $ 195 Million
USA Rancho Seco [7] Multiunit:
913 MWe
12 anni
(Close after a referedum
nel 1989)
SAFSTOR: 5-10 anni
fino al 2018
($ 200-500/kWe) [8]
USA Three Mile Island 2 Multiunit:
913 MWe PWR
core fusion

(in 1979)
Phase 2 (1979)
$ 805 Million
(estimated) [9]
USA Shippingport (The first BWR)
60 MWe
25 years
(closed in 1989)
Decon completed
dismantled in 5 years
(first small
experimental reactor)
$ 98.3 Million [10]
USA Trojan PWR
1.180 MWe
16 years
(Closed in 1993
because nearby to seismic fault)
(cooling tower
demolished in 2006)
 ? [11] [12]
USA Yankee Rowe PWR 185 MWe 31 anni
(greenfield open to visitors) [13]
USA Maine Yankee PWR
860 MWe
24 years
(closed in 1996)
Demolished in 2004
(greenfield open to visitors) [14], [15]
$ 635 Million [16]
USA Connecticut Yankee PWR
590 MWe
28 years
(closed in 1996)
Decon - demolished in 2007
(greenfield open to visitors) [17]
$ 820 Million [18]
USA Exelon -
Zion 1 & 2
PWR - Westinghouse
2 x 1040 MWe
25 years
(1973 - 1998)
(Incident in proceedings,
abandoned because
of the excessive cost of vaporizers substitution)
(opening of the site to visitors for 2018) [19]
$ 900-1,100 Million
(2007 dollars) [20]

Nuclear Decommissioning in Asia

Several nuclear reactors dismantled in Asia, type, power and decommissioning cost per kilowatt of electric power (source: World Nuclear Association article [21] ).

Country: Location: Reactor type: Operative Life: Decommissioning
China [22] Beijing (CIAE) HWWR 10 MWe (multipurpose)
(Heavy Water Experimental Reactor for the production of plutonium and tritium)
49 years
Safestore & Decon in
20 years (until 2027)
$ 6 Million for dismantling
$ 5 Million for fuel remotion
North Korea Yongbyon Magnox-type
(reactor for the production of nuclear weapons through PUREX treatment)
20 years
Deactivated after a treaty [23], [24]
Cooling tower dismantled
Japan Tokai-1 Magnox (GCR)
160 MWe
32 years
Safestore: 10 years [25], [26]
then DECON
until 2018
estimanted cost:
Yen 93 Billion [27]
(Euro 660 Million of 2003)
[28], [29]
2x BWR 160 MWe 40 years ?
NOT deactivated  ?
India [30] Rawatbhata Atomic Power Station-1,2
1x PHWR 100 MWe
1x PHWR 200 MWe
(similar to CANDU)
40 years ?
NOT deactivated  ?
Iraq Osiraq/Tammuz-1
BWR 40 MWe
Nuclear reactor with weapons-grade plutonium production capability
(Destroyed by Israeli Military Aviation in 1981) Not radioactive:
Never refurbished with uranium

Nuclear Decommissioning in Western Europe

Several nuclear reactors dismantled in Western Europe, type, power and decommissioning cost per kilowatt of power: European Union Website about Nuclear Decommissioning [32], World Nuclear Association (reactor building companies) [33], United Kingdom [34].

Country: Location: Reactor type: Operative Life: Decommissioning
Austria [35]
(Nuclear Free Country) [36]
Zwentendorf NPP
Google Maps
723 MWe
NEVER activated [37], after referendum in 1978  ?  ?
Belgium Mol PWR (BR-3)
25 years
pilot project
(underwater cutting and remote operated tools) [38], [39]
France Brennilis HWGCR 70 MWe 12 years
terrorist attack with explosives
Phase 3 Euro 480 Million
(20 times the forecasted amount)
France Bugey-1 UNGG
Gas cooled, graphite moderator
postposned  ?
France Chinon 1,2,3 Gas-graphite
postponed  ?
France St. Laurent Gas-graphite  ? postponed  ?
France Superphénix at
Fast breeder nuclear reactor
11 years
postponed estimated for the future:
$ 4000/kWe ?
Great Britain Berkeley Magnox
(2 x 138 MWe)
27 years
Safestore: 30 years
(internal demolition)
$ 2600/kWe
Great Britain Sellafield-Windscale
(Note: [3])
Windscale Advanced Gas Reactor
(32 MWe)
18 years
Fire of graphite in moderation bars inside the reactor
partial meltdown of fuel
Remotion of reactor in 2009 -
pilot project
(cutting with remot controlled robots, UV lasers) [41], [42], [43], [44]
Bigger than $2600/kWe
(WNI estimes)
Until now
E. 117 Million
West Germany Gundremmingen-A BWR
250 MWe

11 years
dismantling -
pilot project
(underwater cutting)
(~ $ 300-550/kWe)
Italy Caorso NPP BWR
840 MWe [45], [46]
3 years
( 1978 - Closed in 1987 after referendum in 1986 )
Safstore: 30 years
(demolizione interna)
$/kWe [47]
Italy Garigliano NPP (Caserta) BWR
150 MWe [48]
 ? years
(Closed on March 01, 1982)
Safstore: 30 years
(internal demolition)
Italy Latina NPP (Foce Verde) Magnox
210 MWe Gas-graphite [49]
24 years
( 1962 - Closed in 1986 after referendum )
Safstore: 30 years
(internal demolition)
Italy Trino Vercellese NPP PWR Westinghouse,
270 MWe [50]
 ? years

( Closed in 1986 after referendum )
Safstore: 30 years
(internal demolition)
Nederlands Dodewaard NPP BWR Westinghouse,
58 MWe [51]
28 years
Defuelling completed -
Safstore for 40 years
Krsko NPP [52] PWR (Westinghouse)
696 MWe
40? years
Will be deactivated in 2022  ?
Spain Vandellós NPP-1 UNGG
480 MWe
18 years
fire in a turbogenerator
Safestore: 30 years
(internal demolition)
Phases 1 and 2:
Euro 93 Million
Switzerland [53] DIORIT MWe Gas-graphite

Safestore: ? years
(internal demolition)
Switzerland LUCENS 8,3 MWe CO2-heavy water
fire in 1969
Entombment for ? years
Safestore & Decon: 24 years
(internal demolition)
Switzerland SAPHIR 0,01-0,1 MWe
(Light water pool)
39 years
(Experimental demonstrator)
(In public display
since inauguration
open to visitors:

"Cherenkov's light")

Nuclear Decommissioning in Eastern Europe and former Soviet Union

Several nuclear reactors dismantled in the nations born from the former Soviet Union: (Belarus, Russia, Ukraine and others) and rectors dismantled in countries formerly belonging to "Warsaw Pact" and/or to "Comecon", type, electric power and decommissioning cost per kilowatt of power: World Nuclear Association [54], OSTI (Russia & USA) [3].

Country: Location: Reactor typr: Operative life: Decommissioning
Bulgaria Kozloduy NPP-1,2,3,4 [55] PWR VVER-440
(4 x 408 Mwe)
Reactors 1,2 closed in 2003,
reactors 3,4 closed in 2006

(Closing forced
by European Union)
De-fuelling  ?
East Germany Greifswald NPP-1,
5 x 408 MWe

(underwater cutting)
(~ $ 330/kWe)
East Germany Rheinsbergh NPP-1 VVER-210
70-80 MWe
24 years
In dismantling
since 1996
Safstor (underwater cutting)
(~ $ 330/kWe)
East Germany Stendal NPP-1,2,3,4 VVER-1000
(4 x 1000 MWe)
Never activated
(1st reactor 85% completed)
NOT radioactive
(Cooling towers
demolished with explosives)
(Structure in exhibition
inside an
industrial park)
Russia Mayak [56]
PUREX plant for
uranium enrichment
Several severe incidents
 ?  ?
Russia Seversk [57]
Three plutonium reactors
Plant for uranium enrichment
Two fast-breeder reactors closed (of three), after disarmaments agreements with USA in 2003 [58].  ?  ?
Slovakia Mochovce NPP-1,2
(180 km east from Vienna) [59], [60]
VVER 440
2 X 440 MWe
(1998-2028?)  ?
Ukraine Chernobyl NPP-4
(110 km
from Kiev)
1000 MWe
 ? years
WORST NUCLEAR ACCIDENT IN ALL HISTORY: hydrogen explosion, then graphite fire (1986)
See:Chernobyl disaster
(armed concrete "sarcophagus")
Past: ?
Future: riding sarcophagus in steel [61]

Legal aspects

The decommission of a nuclear reactor can only take place after the appropriate licence has been granted pursuant to the relevant legislation. As part of the licensing procedure various documents, reports and expert opinions have to be written and delivered to the competent authority, e.g. safety report, technical documents, environmental impact study (EIS).

In the European Union these documents are the basis for the environmental impact assessment (EIA) according to Council Directive 85/337/EEC. A precondition for granting such a licence is an opinion by the European Commission according to Article 37 of the Euratom Treaty. Article 37 obliges every Member State of the European Union to communicate certain data relating to the release of radioactive substances to the Commission. This information must reveal whether and if so what radiological impacts decommissioning – planned disposal and accidental release – will have on the environment, i.e. water, soil or airspace, of the EU Member States [62]. On the basis of these general data, the Commission must be in a position to assess the exposure of reference groups of the population in the nearest neighbouring states.

Cost of decommissioning

In USA many utilities estimates now average $325 million per reactor all-up (1998 $).

In France, decommissioning of Brennilis Nuclear Power Plant, a fairly small 70 MW power plant, already cost 480 million euros (20x the estimate costs) and is still pending after 20 years. Despite the huge investments in securing the dismantlement, radioactive elements such as Plutonium, Cesium-137 and Cobalt-60 leaked out into the surrounding lake.[63] [64]

In the UK, decommissioning of Windscale Advanced Cooled Reactor (WAGR), a 32 MW power plant, cost 117 million euros.

In Germany, decommissioning of Niederaichbach nuclear power plant, a 100MW power plant, amounted to more than 90 million euros.


(Lack of) Decommissioning Funds

In Europe there is considerable concern on the funds necessary to finance final decommissioning. In many countries either the funds do not appear sufficient to pay the financial decommissioning, and in other countries the (substantial) funds are being used (too) freely for activities other than decommissioning, putting the funds at risk, and distorting competition with parties who do not have nuclear decommissioning funds available.[65]

Currently (2008) the European Commission is looking into this issue.

Similar concerns exist in the United States, where the U.S. Nuclear Regulatory Commission has located apparent decommissioning funding assurance shortfalls and requested 18 nuclear power plants to address that issue.[66]

See also


  1. ^ Nuclear Decommissioning article by World Nuclear Association (associaciation of nuclear reactors builders: [1]
  2. ^ NRC: Locations of Power Reactor Sites Undergoing Decommissioning
  3. ^ a b OSTI: Appendix A - A Summary of the Shutdown and Decommissioning Experience for Nuclear Power Plants in the United States and the Russian Federation. Appendix B - A Summary of the Regulatory Environment for the Shutdown and Decommissioning of Nuclear Power Plants in the United States and the Russian Federation. Appendix C - Recommended Outlines for Decommissioning Documentation
  4. ^ IAEA: Taking Canada's Gentilly-1 to a "static state (by Balarko Gupta)
  5. ^ ASCE: Gentilly-1 a study in nuclear decommission
  6. ^ A Chernobyl in Québec? (correspondence on the dangers of Québec's only nuclear plant)
  7. ^ OSTI: Energy Citations Database about Rancho Seco nuclear power plant
  8. ^ US-NRC: Rancho Seco nuclear power plant
  9. ^ UNITED STATES NUCLEAR REGULATORY COMMISSION: Three Mile Island - Decomissioning Unit 2
  10. ^ OSTI, Office of Scientific and Technical Information - Shippingport station decommissioning project: start of physical decommissioning
  11. ^ Koberstein, Paul (2005-03-09). "Trojan: PGE's Nuclear Gamble". Willamette Week. p. A1. Retrieved 2007-06-15.  
  12. ^ "Trojan Nuclear Plant Decommissioning Update" (PDF). Issues in Perspective. Portland General Electric. March 2006. Retrieved 2008-04-06.  
  13. ^ Yankee Rowe Nuclear Reactor (third nuclear reactor in USA, totally dismantled)
  14. ^ Maine Yankee Nuclear Power Station, ME - Power Technology
  15. ^ Maine Yankee Decommissioning 80% Complete
  16. ^ Maine Yankee Decommissioning Experience Report
  17. ^ Connecticut Yankee Nuclear Reactor - Complete Decommissioning
  18. ^ SEC-INFORMATION: Connecticut Yankee The United Illuminating Company (UI), a wholly owned subsidiary of UIL Holdings Corporation (UIL), owns 9.5% of the equity of Connecticut Yankee Atomic Power Company. Connecticut Yankee has prepared a draft updated estimate of the cost of decommissioning its nuclear unit, as part of its transition to self performance of decommissioning. Connecticut Yankee's draft updated cost estimate includes an increase of approximately $270 million over the cost estimate reported in November 2002
  19. ^ With Exelon's Zion 1 & 2 reactors (2 x 1098 MWe) closed down in 1998 and in Safstor, a slightly different process is envisaged, considerably accelerating the decommissioning. Exelon has contracted with a specialist company - EnergySolutions, to remove the plant and return the site to greenfield status. To achieve this, the plant's licence and decommissioning funds will be transferred to EnergySolutions, which will then be owner and licensee, and the site will be returned to Exelon about 2018. Used fuel would remain on site until taken to the national repository.
  20. ^ WEBWIRE: Exelon Nuclear To Accelerate Decommissioning Of Zion Station
  21. ^ Nuclear Decommissioning article by the association of nuclear reactor builders
  22. ^ IAEA: Decommissioning in China
  23. ^ PRESS TV (Iranian News Agency): North Korea to decommission nuclear facility
  24. ^ THE GUARDIAN: Nuclear agreement: North Korea halts decommissioning
  25. ^ Article in IAEA-TECDOC--1043: Permanent cessation of Tokai power plant's operation
  26. ^ Science Links Japan: Progression of decommissioning of Tokai power plant. First case of power reactor in Japan.
  27. ^ Organisation for Economic Co-operation and Development/Nuclear Energy Agency, report 2003: "Strategy Selection for the Decommissioning of Nuclear Facilities" (page 118)
  28. ^ SCIDEV: India's energy mix needs nuclear boost
  29. ^ ECOWORLD: Nuclear power in India, by Avilash Roul
  30. ^ INDIA - CISED: Economics of Nuclear Power Heavy Water Reactors
  31. ^ Federation of American Scientists: Osiraq/Tammuz Nuclear Reactor
  32. ^ European webside on Decommissioning of Nuclear Intallations - Decommissioning in Europe
  33. ^ Nuclear Decommissioning (Reactor Building Companies)
  34. ^ British Parliament: Estimated dates for the dismantling of nuclear reactors in the United Kingdom
  35. ^ NEA: Decommissioning in Austria
  36. ^ EURONUCLEAR-NEWS: Can Austria Survive Without Nuclear Power ?
  37. ^ SUSTAINABILITY INSTITUTE: Zwentendorf, a Nuclear Plant That Will Never Be Turned On
  38. ^ EU-DECOM-belgium - From 1979 until now: five framework programmes
  39. ^ [ The European Nuclear Decommissioning Training Facility - Mol, Belgium, 2002]
  40. ^ NUCLEARTOURIST: Partial Fuel Meltdown Events
  41. ^ UKAEA - Case Studies - Decommissioning - Windscale Advanced Gas-Cooled Reactor
  42. ^ EU-DECOM-belgium - From 1979 until now: five framework programmes
  43. ^ WAGR decommissioning : preparation, removal and disposal of the WAGR heat exchangers
  44. ^ Summary of Responses to Discussion Letter on Future of Windscale
  45. ^ Zona Nucleare - La centrale nucleare in fase di smantellamento ex-ENEL di Caorso (Piacenza)
  46. ^ Il Fiume Po: La Centrale Nucleare di Caorso
  47. ^ LA REPUBBLICA: Per Caorso un addio lungo mezzo secolo, piano ENEL per smantellare la centrale
  48. ^ Zona Nucleare - La centrale nucleare in fase di smantellamento ex-ENEL di Garigliano (Caserta)
  49. ^ Zona Nucleare - La centrale nucleare in fase di smantellamento ex-ENEL di Foce Verde (Latina)
  50. ^ Zona Nucleare - La centrale nucleare in fase di smantellamento ex-ENEL di Trino Vercellese (Vercelli)
  51. ^ NEA: Decommissioning in the Netherlands ([[]])
  52. ^ Nuclear Power in Slovenia
  53. ^ Nuclear Energy Agency: Decommissioning in Switzerland
  54. ^ Nuclear Decommissioning article by the international association of nuclear reactor builders
  55. ^ World Nuclear Association: Nuclear Power in Bulgaria
  56. ^ La storia dei ripetuti incidenti a Majak
  57. ^ UK-Russia Closed Nuclear Cities Partnership
  58. ^ Russia shuts second plutonium-producing reactor at Seversk
  59. ^ BBC: Austria against restarting of nuclear reactor at Mochovce
  60. ^ YAHOO NEWS: Slovakia forced to restar nuclear reactors after Ukranian gas crisis
  61. ^ European Bank for Reconstruction and Development: Breakthrough for Chernobyl nuclear decommissioning efforts (Consortium Novarka to build New Safe Confinement Holtec International to complete Spent Fuel Storage)
  62. ^ Heuel-Fabianek, B., Kümmerle, E., Möllmann-Coers, M., Lennartz, R. (2008): The relevance of Article 37 of the Euratom Treaty for the dismantling of nuclear reactors. atw - International Journal for Nuclear Power 6/2008
  63. ^ Le Télégramme: Brennilis
  64. ^ Ouest-France: "Brennilis : EDF se fait taper sur les doigts"
  65. ^ ENDS: Nuclear decommissioning funds “require oversight”
  66. ^ [2]

External links


Got something to say? Make a comment.
Your name
Your email address