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Zentralabteilung Forschungsreaktoren Contents - The German FRJ-2 Research Reactor - Operation and Decommissioning - Distribution of Neutronflux and activity.

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Presentation on theme: "Zentralabteilung Forschungsreaktoren Contents - The German FRJ-2 Research Reactor - Operation and Decommissioning - Distribution of Neutronflux and activity."— Presentation transcript:

1 Zentralabteilung Forschungsreaktoren Contents - The German FRJ-2 Research Reactor - Operation and Decommissioning - Distribution of Neutronflux and activity Geometrical Nodalization (MCNP) ORIGEN Model and Calculations - Effects of geometrical inhomogenities - Results and Summary ANALYSIS OF THE ACTIVITY INVENTORY FOR THE DECOMISSIONING PLAN OF THE GERMAN FRJ-2 RESEARCH REACTOR R. NABBI, P. BOURAUEL, G. DAMM

2 Type:Tank Operation: 1962 - 2006 Thermal Power: 10/15/23 MW Moderator / Coolant:D 2 O (Heavy Water) Vertical experimental tubes:25 inside core and 25 inside reflector Horizontal experimental tubes:10 inside D 2 O and 21 inside graphite reflector Neutron flux: core max.:3,2*10 14 1/(cm 2 s) reflector max.:2,6*10 14 1/(cm 2 s) Zentralabteilung Forschungsreaktoren The main design data of the FRJ-2 Research Reactor

3 Zentralabteilung Forschungsreaktoren Nab-April2007 MCNP: Arrangement of the beam tubes in the structures

4 Zentralabteilung Forschungsreaktoren MCNP: FRJ-2 model with the nodalized reactor core

5 Zentralabteilung Forschungsreaktoren MCNP: FRJ-2 model with the nodalized reactor core

6 3-d Distribution of the n-flux in the reactor core midplane and fuel element (MCNP-BURN) Core center CoreFuel element

7 Zentralabteilung Forschungsreaktoren MCNP: Nodalization of the whole reactor block

8 Zentralabteilung Forschungsreaktoren Visualization of the streaming effect Cd-layer

9 Zentralabteilung Forschungsreaktoren MCNP: Distribution of thermal N-flux

10 Zentralabteilung Forschungsreaktoren Neutron flux distribution in the structures

11 Detailed neutron flux distribution in the structure

12 Zentralabteilung Forschungsreaktoren Distribution of N-flux above the Cd-layer Nab-April2007

13 Distribution of thermal N-flux in the steel tank Zentralabteilung Forschungsreaktoren

14 Total activity in the structures of the reactor

15 Zentralabteilung Forschungsreaktoren Nuclide activity in different structures after 5 years cooling time

16 Zentralabteilung Forschungsreaktoren Distribution of the total activity in radial structures

17 Zentralabteilung Forschungsreaktoren Summary & Conclusions A sophisticated MCNP model is generated on the basis of detailed material composition and geometrical design data Using the MCNP model the neutron flux was determined with a high level of accuracy and low standard deviations Using ORIGEN, the activity inventory in different components could be determined. The calculations resulted in a detailed activity map allowing The determination of the low and high level activity zones Reduction of waste material mass and volume Optimum dismantling process with minimum radiation effect The main source of activity are H3, Fe55 and Co60 resulting from the activation of impurities

18 Horizontal cut view of the whole reactor block Therm. Power Central FE


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