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Location of Fissile Material : Total γ -ray count of modelled plutonium glove box via MCNPX Kelum Gamage BSc.(Eng), PhD student (2 nd year), AMIE(SL),

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Presentation on theme: "Location of Fissile Material : Total γ -ray count of modelled plutonium glove box via MCNPX Kelum Gamage BSc.(Eng), PhD student (2 nd year), AMIE(SL),"— Presentation transcript:

1 Location of Fissile Material : Total γ -ray count of modelled plutonium glove box via MCNPX Kelum Gamage BSc.(Eng), PhD student (2 nd year), AMIE(SL), IEEE Professor Malcolm Joyce BSc, PhD, CEng, CPhys, FInsP, FInucE 1

2 2 Nuclear Decommissioning… Kelum Gamage Paper No:12

3 3 Significance of the Project [1]  characterisation of glove boxes, moribund plant  assessment of future arising from current processes  accelerate the assessment of plutonium contaminated material  reducing risk and potential dose to workers  enable the PCM hazards to be prioritised source of energy toxicological riskradiological hazards Kelum Gamage Paper No:12

4 4 Plutonium-239 Gamma-ray Spectrum [2] Kelum Gamage Paper No:12

5 5 Analytical approach for gamma-ray self-shielding effects [3] plutonium-239 (93%) & 240 (7%) 316L stainless steel (cobalt- 60) concrete (caesium-137) compared with MCNPX simulations Gamma-ray self shielding Kelum Gamage Paper No:12

6 6 Gamma-ray self shielding (cont.) Kelum Gamage Paper No:12

7 7 Sphere Cylinder Cube Gamma-ray self shielding (cont.) Kelum Gamage Paper No:12

8 8 Modelling of glove box environment [4]  MCNPX simulations  Plutonium-239 (93%) & 240 (7%)  Layers and lump type  Enclosure types Kelum Gamage Paper No:12

9 9 Modelling of glove box environment (cont.) Figure a : Spherical lump Figure b : Layered type Case 1 Kelum Gamage Paper No:12

10 10 Modelling of glove box environment (cont.) Figure a : Enclosure thickness const. Figure b : Pu mass const. MCNPX results case 1 : Sphere lump Kelum Gamage Paper No:12

11 11 Modelling of glove box environment (cont.) MCNPX results case 1 : Cylindrical lump Figure a : Enclosure thickness const. Figure b : Pu mass const. Kelum Gamage Paper No:12

12 12 Modelling of glove box environment (cont.) MCNPX results case 1 : Cubical lump Figure a : Enclosure thickness const. Figure b : Pu mass const. Kelum Gamage Paper No:12

13 13 Modelling of glove box environment (cont.) MCNPX results case 1 : Pu layer type Figure a : Enclosure thickness const. Figure b : Pu mass const. Kelum Gamage Paper No:12

14 14 Modelling of glove box environment (cont.) Case 2 Kelum Gamage Paper No:12

15 15 Modelling of glove box environment (cont.) MCNPX results case 2 Figure a : x=20 Figure b : x=40. Kelum Gamage Paper No:12

16 16 Modelling of glove box environment (cont.) MCNPX results case 2 Figure a : x=60 Figure b : x=80. Kelum Gamage Paper No:12

17 17 Conclusion Kelum Gamage Paper No:12 Spherical lump type Stainless steel & Borosilicate type Locate near front surface Peak count at the center of the plane

18 18 Acknowledgement Kelum Gamage Paper No:12

19 19 References 1.M. Joyce. Location of fissile material with digital fast neutron tracking. Application for NDA doctoral bursary, July ENSDF Data Base. Evaluated nuclear structure data file. [Online] Available: K. Gamage, M. Joyce. An analytical approach to γ-ray self-shielding effects for radioactive bodies encountered nuclear decommissioning scenarios. (In preparation) 4. K. Gamage, M. Joyce. Determination of 129keV γ-ray emission of modeled plutonium glove boxes using MCNPX. (In preparation) Kelum Gamage Paper No:12

20 20 THANK YOU... Contact : Kelum Gamage Paper No:12


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