VISIPLAN 3D ALARA planning tool applied to decommissioning ...

VISIPLAN 3D ALARA planning tool applied to decommissioning ...

Dose assessment and dose optimization using the VisiPlan 3D ALARA planning tool Examples 0.001 Geometric and material data taken from paper plans Sources HDTDDT tube floor HDT strainer PU571 V18 V17 SC2 SC1 PU 501 Herpi RC 2060 SPHX CL MC2 Model Building and validation MC2 MC1 mixed bed PR surge line SP M 95 Spray tank level 3 PR level 3 GV level 3

GV level 7 PR level 7 Tyau brun 2 Tyau brun 1 Dose (mSv/h) Example of decommissioning activities BR3 (1) Comparison contacts 10 1 0.1 Metingen VISIPLAN 0.01 Example of decommissioning activities BR3 (2) General planning A. Situation before the operations. D. Removal of the rotors. B. Hot spot removal on level 0 m E. Removal of the SPHX C. Hot spot removal around DDT lower part F. Removal of the shutdown circuit Example of decommissioning activities BR3 (3) Detailed planning "Prparati on " du chant ier man h obturation des fent res de la piscine RC (7) 2

5 Vent ilat ion mobile BR2 3 Stand de dcoupe (inst allation / check) 3 4 Marquage tuyaut eries 2 12 8 Modi fi cati ons de s ci rcui ts Eau de service 2 10 SOD 3 24 OD (niet ) 2 10 2 5 2 2 P ompe MC n2 2 2 Herpi's

2 2 Ligne collecte d'effluent s 2 3 Dshabillage DDT suprieur 2 4 Dshabillage SPHx 2 4 Spray System 2 5 Dshabillage DDT infrieur (dont L.O. + HDT ) 2 3 P iquages t uyaut eries primaires 2 3 Dshabillage MBT + vacuat ion 2 4 P iquages GV 2 3 Dmant lement ligne N 2

2 man h 2 5 niv - 4,805 m 4 6 sur balanoires MC 4 9 MK7 (GV) 3 12 Aut res MK3 - MK6 (balanoires MC, T P ) 3 12 vacuati on de s rotors de s pompe s pri mai re s 2 4 vacuati on de s S PHx (opti onn e l ) 2 5 Air comprim Mi se en s cu ri t NS T vase d'expansion D man tl em en t poi nts chau ds + au tres oprati ons vacuati on ch e mi ns de cbl e s Mon tage chafaudage s (fi rme e xt rie u re )

Modifi cati on tat de s bo te s re ssort Example of decommissioning activities BR3 (4) Scenario comparison Total manSv as a function of collective time 25000 man.Sv 20000 Collective dose without dose reducing actions 15000 VISIPLAN PV Wihtout HS removal HS removal SPHX not removed 10000 Collective dose with Hot spot removal 5000 Collective dose with Hot spot and Heat exchanger removal 0 0 500 1000 man.h 1500 2000 Decommissioning of Cell 41 (SCKCEN) VisiPlan Dose prognoses : 21 man*mSv Measured 26 man*mSv

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