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Preparing a decommissioning project (part II)

Preparing a decommissioning project (part II). H. Sterner E. Thurow Energiewerke Nord GmbH. H. Sterner; E. Thurow, EWN, chapter 3. Measurements performed, exempted from Atomic Law. Measurements going on, exemption planned in 2004. Site reuse Exemption from Atomic Law of site areas.

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Preparing a decommissioning project (part II)

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  1. Preparing a decommissioning project(part II) H. Sterner E. Thurow Energiewerke Nord GmbH H. Sterner; E. Thurow, EWN, chapter 3

  2. Measurements performed, exempted from Atomic Law Measurements going on, exemption planned in 2004 Site reuseExemption from Atomic Law of site areas Free release measurement of site area

  3. Site reuseConstruction of harbour

  4. Technical concept Basic issues • main decommissioning and dismantling steps • dismantling principles • operational waste management • categorisation of systems/buildings/areas by radiological classes • inventory • mass flow logistic (from dismantling) • necessary plant adaptation • main items of investments (new equipment) • special dismantling and disposal concept for highly activated components • safe post operation, evaluation of the residual life time of old equipment • possibilities to reduce operational costs

  5. Technical conceptEWN table of content • Introduction • Site and buildings description • Present status • Decommissioning and dismantling activities • Decontamination methods • Emissions • Material flow and waste management • Radiological protection • Declassification • Necessary new installations and systems • Fire protection • Workers protection • Plant security • Infrastructure • Safety case • Environmental impact assessment

  6. Technical concept EWN - dismantling principles • as large components / parts as possible for treatment in our warm workshop or interim storage • dismantling planning on system basis, execution on room basis • start in unit 5; low contamination / dose rate • from low to high contamination / dose rate • use market equipment • in situ decontamination only for dose reduction

  7. Technical conceptEWN - main direction of dismantling

  8. Technical conceptPlant inventory • Systems and other components on a room-by-room basis • Masses and material types (on a room- and system-basis) • Contamination in rooms and systems (including evaluation • of contamination penetration in concrete structures) • Dose rates, including ambient rates in rooms, hot spots, • and at large components • Hazardous materials (Asbestos, PCB etc.)

  9. Technical conceptCategorisation by radiological classes • Category I - unrestricted material • Category II - suspected material (an eventual contamination cannot be excluded) • Category III - contaminated material

  10. Technical conceptCategorisation by radiological classes EWN - example Estimated mass ratio for contamination categories in the turbine hall units 1 – 4 Category I unrestricted material ca. 45 % Category II suspected material ca. 53 % Category III contaminated material ca. 2 %

  11. Technical conceptClassification of systems I Systems necessary for nuclear safety and/or radiation protection II Systems necessary for industrial safety and/or operation III Not necessary systems

  12. Technical concept WWER 440 - classification of systems (example)

  13. Technical conceptWaste and material management • Fuel • Operational waste • Dismantled material

  14. C 3 0 C A S C T A O S R T O 4 4 R 0 / 4 8 4 4 0 / 8 4 Technical conceptEWN - fuel management

  15. 3 CASTOR (252) 3 CASTOR-MOX (3) unit 5 unit 4 unit 3 unit 2 unit 1 Fuel 0 0 0 0 245 0 584 0 578 221 pool Reactor 349 0 349 0 0 0 0 0 313 0 C - 30 Wet Storage ZLN Interim Storage 39 TLB CASTOR(35 KGR; 4 KKR) 2940 KGR CASTOR C - 30 2398 1607 235 Sale 1990 2004 (1996) Technical conceptEWN - fuel management (state September 2004)

  16. Technical conceptEWN – operational waste management

  17. Plant Greifswald site 1.800.000 Mg Category II and III Potentially contaminated and contaminated Ca. 565.000 Mg Category I Not contaminated Ca. 1.235.000 Mg Concrete and plant parts Ca. 94.000 Mg Plant parts TH 1 – 6, IH 6 Ca. 50.000 Mg Building structures Ca. 1.185.000 Mg Remaining building structures Ca. 471.000 Mg Technical conceptEWN - material management

  18. Technical conceptEWN - material managementRelease measurement

  19. Technical conceptProject structuring • Different structures depending on point of view • Work breakdown • Responsibility • Objects • Type of work • Phases

  20. Technical conceptEWN - Work breakdown

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