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-Oqn ZAP ENERGY <br /> ZRD-SPL-001 <br /> 2.3.2 Shielding Specifications <br /> Additional shielding has been designed to meet the dose limits for the shielding design and the <br /> ALARA principles. The specifications of the shielding are listed in Table 3; the 3D model in the <br /> PHITS simulation model is shown in Figure 9 with a top-down view and a different angle view. <br /> Table 3.Shielding description and their specifications. <br /> Shielding Shielding Shielding <br /> Description Shielding Height <br /> Label Material Thickness <br /> A West wall HDPE 5 in — 8 ft above the floor <br /> B Southwest wall HDPE 5 in 8 ft above the floor <br /> C South wall HDPE 6 in 8 ft above the floor <br /> Supplementary 7 ft 10 in to 9 ft 10 in above the <br /> D South wall HDPE 1 in floor <br /> (overlap with"C"by 2 in) <br /> E East wall HDPE 5 in 8 ft above the floor <br /> F North wall HDPE 5 in 8 ft above the floor <br /> G Northwest wall HDPE 5 in 8 ft above the floor <br /> H HV Lab wall HDPE 1 in 8 ft above the floor <br /> 2.3.3 Dose Distribution with additional shielding and Dose Contributions from Gamma <br /> The annual unshielded and shielded doses at the areas of consideration are listed in Table 2. Figure <br /> 10 shows a 2D dose map at the machine for the Zap Everlab facility with a 100-mrem/y iso-dose <br /> boundary. The relative statistical uncertainties of the dose calculation in the PHITS Monte Carlo <br /> simulation are plotted in Figure 11. The statistical uncertainties are in general below 3-5% at the <br /> considered locations. It is concluded that the occupied areas are all below the dose limit with the <br /> specific occupancy for each space with sufficient statistically significant confidence. <br /> Among the total effective dose, contributions can be broken down into neutrons and gamma rays. <br /> The gamma rays are generated when neutrons interact with the surrounding materials and the <br /> HDPE shielding. The dose contribution from gamma rays in shown in Figure 12 with an iso-dose <br /> line of 10 mrem/y. It is confirmed that the gamma rays only contribute to a few percent of the total <br /> doses in the areas of concern. <br /> Zap Energy Inc. Proprietary Information <br /> 12 <br />