Preparing a decommissioning project(part II)H. SternerE. ThurowEnergiewerke Nord GmbHH. Sterner; E. Thurow, EWN, chapter 3

Site reuse Exemption from Atomic Law of site areasFree release measurement of site area

Site reuseConstruction of harbour

Technical concept Basic issuesmain decommissioning and dismantling stepsdismantling principlesoperational waste managementcategorisation of systems/buildings/areas by radiological classesinventorymass flow logistic (from dismantling)necessary plant adaptationmain items of investments (new equipment)special dismantling and disposal concept for highly activated componentssafe post operation, evaluation of the residual life time of old equipmentpossibilities to reduce operational costs

Technical conceptEWN table of contentIntroductionSite and buildings descriptionPresent statusDecommissioning and dismantling activitiesDecontamination methodsEmissionsMaterial flow and waste managementRadiological protectionDeclassificationNecessary new installations and systemsFire protectionWorkers protectionPlant securityInfrastructureSafety caseEnvironmental impact assessment

Technical concept EWN - dismantling principlesas large components / parts as possible for treatment in our warm workshop or interim storagedismantling planning on system basis, execution on room basisstart in unit 5; low contamination / dose ratefrom low to high contamination / dose rateuse market equipmentin situ decontamination only for dose reduction

Technical conceptEWN - main direction of dismantling

Technical concept Plant 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.)

Technical concept Categorisation by radiological classes Category I- unrestricted material

Category II- suspected material (an eventual contamination cannot be excluded) Category III- contaminated material

Technical concept Categorisation by radiological classes

EWN - example

Estimated mass ratio for contamination categoriesin the turbine hall units 1 4

Category Iunrestricted material ca. 45 %Category IIsuspected materialca. 53 %Category IIIcontaminated materialca. 2 %

Technical concept Classification of systemsISystems necessary for nuclear safety and/or radiation protectionIISystems necessary for industrial safety and/or operationIIINot necessary systems

Technical concept WWER 440 - classification of systems (example)

SystemUnitSystem CategoryRemarksPost OperationPreparation SafeEnclosureSafe Enclosureventilation for reactor- and auxiliary building1, 2, 3, 4IIICapacity reduction,Adaptation and/orInstallation of newVentilation systemswater cleaning system 2 (SVO-2)1/23/4IIIIIIIIIIIIIIIIIIwater cleaning system 3 (SVO-3) including sewage water system1/23/4IIIIIIIIIIIIIIwater cleaning system 4 (SVO-4)1/23/4IIIIIIIIIIIIIIIIsteam generator facility1, 2, 3, 4IIIIIIIIIsteam generator blowdown system1, 2, 3, 4IIIIIIIIIwater cleaning system 5 (SVO-5)1, 2, 3, 4IIIIIIIIIwater cleaning system 6 (SVO-6)1 - 4IIIIIIIIIsolid radioactive waste store1 - 4IIIIIremoval solid wasteliquid radioactive waste store1 - 4IIIIIoff-gas cleaning system1/23/4IIIIIIIIIIIIIIIIII

Technical conceptWaste and material management Fuel

Operational waste

Dismantled material

Technical conceptEWN - fuel management

Technical conceptEWN - fuel management (state September 2004)

Technical conceptEWN operational waste management

disposal as

conventional waste

drum drying

facility

Treatment

drum drying

facility

rotational thin

film evaporator

planet

drum drying

facility

equipment for

drying of resins

disposal as radioactive waste

Interim

Storage Nord

(ISN)

Interim

Storage Nord

(ISN)

Interim

Storage Nord

(ISN)

Interim

Storage Nord

(ISN)

Interim

Storage Nord

(ISN)

free classing

facility

equipment for

drying of resins

sorting and

compaction

facility

sludges from

outside the

controlled area

sludge-resin

mixtures

low-activated

resins

solid radioactive

mixed waste

liguid evaporato

concentrates

buffer storage

Technical conceptEWN - material management

Technical conceptEWN - material managementRelease measurement

Technical conceptProject structuringDifferent structures depending on point of view Work breakdown

Responsibility

Objects

Type of work

Phases

Technical conceptEWN - Work breakdown