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HAPL Concrete Shielding Requirements Mohamed Sawan UW Fusion Technology Inst. HAPL Project Meeting UW-Madison October 22-23, 2008.

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Presentation on theme: "HAPL Concrete Shielding Requirements Mohamed Sawan UW Fusion Technology Inst. HAPL Project Meeting UW-Madison October 22-23, 2008."— Presentation transcript:

1 HAPL Concrete Shielding Requirements Mohamed Sawan UW Fusion Technology Inst. HAPL Project Meeting UW-Madison October 22-23, 2008

2 October 2008 HAPL Meeting, UW 2 Concrete Shielding Configuration Containment Building Bio-shield Arch Structural Support Beam Duct Shield

3 October 2008 HAPL Meeting, UW 3 Past HAPL Concrete Shielding Approach  Concrete bio-shield around final optics and chamber was determined previously assuming that access is allowed outside it during operation  This led to a sizable bio-shield  Adding the concrete containment building and concrete arch structural support results in significant amount of concrete

4 October 2008 HAPL Meeting, UW 4 Previous HAPL Concrete Shield Dimensions From T. Kozub, C. Gentile, I. Zatz, et al., “Concepts and Requirements for GIMM Structures,” April 2008 HAPL meeting ~400,000 m 3 of concrete  2.5 m inner spherical bio- shield around chamber  3.8 m containment building

5 October 2008 HAPL Meeting, UW 5 Current HAPL Bio-Shielding Strategy  Access inside containment building allowed only for maintenance during shutdown periods  Inner bio-shield around chamber and final optics sized to yield acceptable dose of ~2.5 mrem/h about one day after shutdown  Containment building sized to yield an acceptable occupational dose to workers of ~0.5 mrem/h during operation  Even with these conservative dose limits significant reduction in amount of concrete can be achieved

6 October 2008 HAPL Meeting, UW 6 Required Inner Bio-Shield  Past experience showed that if fast neutron flux (E>0.1 MeV) is limited to ~5x10 5 to 3x10 6 n/cm 2 s during operation, dose rate levels of ~2.5-10 mrem/h after 1-10 day cool down period will result from decay gamma of activated shield and outlying equipments allowing for hands-on maintenance  To get conservative estimates we use 5x10 5 n/cm 2 s fast neutron flux limit during operation to determine required inner bio- shield thickness that allows for hands-on maintenance

7 October 2008 HAPL Meeting, UW 7 Required Inner Bio-Shield (Cont.)  Required inner bio-shield around chamber determined for two blanket options: ⁃ 80 cm LiPb/SiC blanket, 10 cm SS/water VV ⁃ 100 cm Flibe/Be/SiC blanket, 10 cm SS/water VV  Largest shield required at the neutron trap behind the GIMM where no shielding credit is provided by blanket and VV  Required shielding around final optics estimated from map of fast neutron flux around laser beam line

8 October 2008 HAPL Meeting, UW 8 Required Inner Bio-Shield behind Blanket/VV  Assumed inner surface at 20 m from target  Type 04 ordinary concrete used with SS316 rebar  Required inner bio- shield thickness behind LiPb blanket is ~1 m and reduces to only ~0.75 m with Flibe blanket  A conservative 1 m thickness is recommended

9 October 2008 HAPL Meeting, UW 9 Required Bio-Shield at Neutron Trap behind GIMM  Required bio- shield thickness at neutron trap (@33 m from target) behind GIMM is ~1.85 m  Conservative thickness of 2 m is recommended

10 October 2008 HAPL Meeting, UW 10 Required Bio-Shield Around Final Optics  Bio-shield thickness at GIMM is 1 m and reduces to 0.5 m around M2 and 0.3 m around M3  Shield at neutron trap should be 2 m at back and 1.5 m at side Fast Flux (n/cm 2 s) 0.3 m shield SiC GIMM M2 M3 2 m shield 0.5 m shield 1 m shield 1.5 m shield

11 October 2008 HAPL Meeting, UW 11 Required Containment Building Thickness  Assumed inner surface of containment building at 50 m from target  Type 04 ordinary concrete used with carbon steel C1070 rebar  Required containment building thickness is ~1.5 m  Since no credit is taken for added shielding by concrete arch structure, we can use thinner containment building

12 October 2008 HAPL Meeting, UW 12 Summary and Conclusions  Amount of concrete required for bio- shield and containment building can be reduced significantly (by at least a factor of 2) based on shielding requirements  Considerations for structural support might dictate using thicker bio-shield and containment building than required for radiation shielding

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