- 2 Problem 4 19 Referring To The Nominal Lwr Cycle Described In Fig 4 39 Compute A The Specific Burnup Of The Fuel 1 (122.44 KiB) Viewed 52 times
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2. Problem 4.19: Referring to the nominal LWR cycle described in Fig. 4.39, compute (a) the specific burnup of the fuel in MWd/t; (b) the fractional burnup of the fuel; (c) the enrichment of the fresh fuel; (d) the enrichment (235U) of the spent fuel; (e) the fraction of the power originating in fissions in 235U and plutonium, respectively; (f) the 30-year requirement for uranium for this system. The plant operates at an overall efficiency of 33.4 %. (Ans.(a) 30,380 MWd/t, (b) 0.032, (c) 3.01 w/o, (d) 0.85 w/o, (e) 72.9% from 235U and 27.1% from Pu, (f) For 0.75 GWe-yr, 4.5kt..) Uraniam mining and malling U O 150047 U Conversion to UF UF 149.297 U - 3 wlo UFG Fuel Enrichmeat 821 230 fabrication 27,249 THM Lass 750U 0.2 wa tails Loss 8 2350 272 TH. Waste isposal Decayed fuel Spent foed slaraga Spent fuel assemblies EOC Reactor to, foel assemblies BOC Fuel Noces: composition 1. Mass flows in kg's per 0.75 GWe-yc. BOC EOC 2. Abbreviations: BOC = beginning of refueling cycle 23U 813 220 BOC = and of refueling cycle U 26,977 25,858 F-fission products Pa Gissile 178 Pa = total plutonium Pa issile - 139pa + 2417 Pu 246 TAM - total heavy metal - U+ Du THM 26,977 26,104 U = total uunium FP- 873 FD Un Figure 4.39 LWR once through fuel cycle. (Based on Nuclear Proliferation and Civilian Nuclear Power, U.S. Department of Energy report DOE/NE-0001/9, Volume 9, 1980.)