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4-1 0 to the denatured cycle would consist initially in replacing the 93% 235U in 238U with 15 to 20% 235U in 238U. The HTGR has reached the prototype stage at the Fort Vrain plant in Colorado and a PBR-type reactor has been generating electricity in West Germany since 1967. While the above thermal reactors show promise as power-producing advanced converters, they will not be self-sufficient on any of the proposed alternate fuel cycles and will re- quire an exogenous source of 233U. An early but limited quantity of 233U could be provided by introducing thorium within the cores of 235U-fueled LWRs, but, as has already been pointed out in this report, for the long-term, reactors dedicated to 233U production will be required. f In the envisioned scenarios those reactors primarily will be fueled with Pu . In the calculations presented here a principal 23 % production reactor is the mixed-oxide-fueled LMFBR containing thorium in its blanket. blanket assemblies intermixed with fuel assemblies are examined. The possible advantages and disadvantages of using metal- or carbide-based LMFBR fuel assemblies are also discussed. Finally, some preliminary calculations for a helium-cooled fast breeder reactor (GCFBR) are presented. In addition, "advanced LMFBRs" that have The consideration of fast reactors that burn one fissile material to produce another has introduced considerable confusion in reactor terminology which, unfortunately, has not been resolved in this report. In the past, the term fast breeder has been applied to a fast reactor that breeds enough of its own fuel to sustain itself. Thus, the fast reactors that burn 239Pu to produce 233U are not "breeders" in the traditional sense. however, producing fuel at a rate in excess of consumption, which is to be contrasted with the advanced thermal converters whose primary function is to stretch but not increase the fuel supply. transmuters was coined at ORNL. any reactor that burns one fuel and produces another. that the words fast and breeder are used synonymously. Thus in this report and elsewhere we find various combinations of terms, such as LMFBR transmuter and converter transmuter. The situation becomes even more complicated when the fast reactor design uses both 238U and 232Th i n the blanket, so that in effect it takes on the characteristics of both a transmuter and a breeder. They are, In order to distinguish the P u - ~ o - ~ ~ fast ~ U reactors from others, the term Immediately, however, the word began to be applied to Moreover, it soon became obvious Finally, the reader is cautioned not to infer that only those reactors discussed in this chapter dre candidates for the enerTy-center, dispersed-reactor scenarios. In fact, the scenarios discussed in Chapter 6 do not even use all these reactors and they could easily consider other reactor types. assessment of the denatured 233U fuel cycle was based primarily on the availability of data at the time the study was initiated (December, 1977). The selection of reactors for this preliminary tl L L I: L
_- I -- L i d .-- L 4-1 1 References for Section 4.0 1. P. R. Kasten, F. J. Homan et al., "Assessment of the Thorium Fuel Cycle in Power Reactors," ORNL/TM-5665, Oak Ridge National Laboratory (January 1977). 2. P. R. Kasten, "The Role of Thorium in Power-Reactor Development," Atomic Energy Re- view, Vol. 111, No. 3. 3. "The Use of Thorium in Nuclear Power Reactors," prepared by Division of Reactor Development and Technology, U.S. Atomic Energy Conmission, with assistance of ANL, B&W, BNL, GEA, ORNL, and PNL, WASH 1097 (June, 1969).
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Interim Assessment of the Denatured
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i L i b I, i L L bi L L Contract No
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1, L L t i Ltr 1 L L V PREFACE AND
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L i Li 1, I b k b id ii t L id b i
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I L bi i; L 7.3.1. Possible Procedu
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i xi I b L ABSTRACT A fuel cycle th
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I b .- i, hd t t CHAPTER 1 INTRODUC
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- - I 4d _- t .- ! Lili L Ld id .-
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L .- k id .- I L: _ - I iclr .- i b
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I, G - -- I id ..- ! I _. I: L _.-
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huJ -- AI I ' b --- I bl --- t L L
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-- t Li - I' b -. c (u I i ai L i i
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L - i' u i Lt L r- L t- b L 2-7 den
Page 29 and 30: 2-9 1. Nuclear power is limited to
Page 31: e Isr i L i- b t CHAPTER 3 ISOTOPIC
Page 34 and 35: 232" Fig. 3.0-1. Decay of 232U. ORN
Page 36 and 37: 3-6 3.1. ESTIMATED U CONCENTRATIONS
Page 38 and 39: 3-8 The values in Table 3.1-2 are a
Page 40 and 41: 3-1 0 3.2. RADIOLOGICAL HAZARDS OF
Page 42 and 43: 3-1 2 232u IN RECYCLED HTGR FUEL (p
Page 44 and 45: 3-14 3.2.2 Toxicity of 232Th Given
Page 46 and 47: 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11.
Page 48 and 49: 3.18 There are three approaches whi
Page 50 and 51: 1 i i 3-20 3.3.2. Fabrication and H
Page 52 and 53: The 3-22 3.3.3 Detection and Assay
Page 54 and 55: 3-24 3.3.4. Potential Circumvention
Page 56 and 57: 3-26 - either large centrifuge pilo
Page 58 and 59: ! 3-28 Table 3.3-3. Enriched Proauc
Page 60 and 61: 3-30 The high alpha activity of ura
Page 62 and 63: 3- 32 Table 3.3-7. Sumry of Results
Page 64 and 65: 3-34 statistical redundancy through
Page 66 and 67: introduce time, cost and visibility
Page 68 and 69: 3-38 An additional factor relative
Page 71 and 72: I b t I t L 1; L t ki 4.0. 4.1. CHA
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Page 75 and 76: Y m I I I . aro ID0 10.00 4-5 ORNL-
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Page 87 and 88: u -- x i I*i 1- bi 4-1 7 The use of
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Page 91 and 92: 4-21 Case B" is a modification of C
Page 93 and 94: c 4-23 L i a L L 4.2. SPECTRAL-SHIF
Page 95 and 96: 4-25 Initial analyses of spectral-s
Page 97 and 98: h 1' b t c i--; & I- & 1: i f 4-27
Page 99 and 100: c- i L L e I b 4-29 . safeguards fo
Page 101 and 102: L t i- bi L L t i 4-31 a significan
Page 103 and 104: ~ kc'l c" -1 r-"! r! r-'i c Table 4
Page 105 and 106: F-- I iJ L ii - L c c 4-35 Referenc
Page 107 and 108: c r- L i] L h L __ f; t 4-37 trons
Page 109 and 110: Table 4.4-1. Fuel Utilization Chara
Page 111 and 112: L I 1 I Ld I ie i-- 1 t' 4-41 4.4.2
Page 113 and 114: 4-43 Table 4.4-4. PBR Coated Partic
Page 115 and 116: HEU/Th 0.59 Seed i3 Breed 0.58 HEU/
Page 117 and 118: L i; 1 I i; i 1. 2. 3. 4. 5. 6. 7.
Page 119 and 120: 4-49 Table 4.5-1. Fuel Utilization
Page 121 and 122: ments. 4-51 The calculations for LM
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Page 125 and 126: Table 4.6-1. Comparison of Fuel Uti
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Page 129 and 130: 4-59 Most of the information availa
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- i b k L L -- I , b -- I .- I Li L
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4-63 on only the preliminary data p
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c e E c
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! 5-4 5.1. REACTOR RESEARCH AND DEV
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5-6 As has been pointed out above,
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5-8 the LMFBR on its reference cycl
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5-10 The fuel performance program u
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. 5.1.2. Government Research and De
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5-1 4 The first aspect of large pla
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5-1 6 and should also address metho
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I DATA BASE DEMu)pMENT DEMO DESIGN
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j ~ 5-20 The R,D&D costs are highes
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5-22 In the case of metal-clad oxid
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5-24 5.2.2. Research, Development,
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5-26 program, including hot testing
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c c
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6-4 persed areas ensured - a fact w
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6-6 6.1.2. Reactor Options The reac
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Reactor/Cycl ea LWR-U5(LE)/U-S LUR-
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6-10 6.1.3. Nuclear Policy Options,
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Table 6.1-4. Nuclear Policy Options
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SWU SWU 6-14 UZJS USILEINS WYI U5IL
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6-16 n nM MEDL nows.1 Option 4: In
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6-18 HM HEDL7OOl.70.3 Option 6: In
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SRCIFIED CONSTRUCTION LlMllLD INTRO
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50- 40 6-22 c Y \ VL - :-: F 30- -
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6-24 The potential nuclear contribu
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%- f $400 J 2 s 2, 1 THE LWR FOLLOW
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141.6 ST - U308 4 7.2 lo3 swu ENRIC
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6-30 reactor. Since this increase i
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‘9. ,1 ST ‘3O8 6-32 12 Kg HM I
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6-34 1HE LWR WITH FISSILE UUNIUM PC
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THE LWR WITH PURONIUM MlNUllUTlON A
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6-38 be located in energy centers a
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6-40 installed capacity must be han
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lm, 1 I I I I mf RR WITH UGHT rwrmi
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6-44 6.2.7. Converter-Breeder Syste
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25.2 ST swu 6-46 19 Kg fir Pu 13 Kg
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6-48 Table 6.3-2. Summary of Result
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6-50 (4) If all plutonium produced
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I d r-- 1 > w I r- k z r L id r- .
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L 1 L u without benefit of U.S. exp
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L a, - L i -- k; L t IJ L 7-7 While
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7-9 Viewed solely from the plutoniu
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L L i; i; 7-1 1 routinely in LWRs a
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'I 7-1 3 t I: k: The isotopic compo
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U L L L L ld 1 i" * required 233U m
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I I, i 7-1 7 ii I 1 I L L k L i Thr
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li i i L Li L & I ' i kr ii L i h i
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7-21 7.3. PROSPECTS FOR IMPLEMENTAT
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L I L t L i L i 1 L 7-23 7.3.1. Pos
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7-25 7.3.2. Considerations in Comme
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.. I b k; L; i b b 1J I L 7-27 cycl
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7-29 7.4. ADEQUACY OF NUCLEAR POWER
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L i' hd .- - I ' i t L i' b i -' b
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x ibd 1 .. I i, L -- i t Table 7.4-
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7-35 cycled in Pu/Th converters, th
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L 1' b I_- ,- i b -- I ' b L 7-37 T
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..a 4 I- 1 ' u c1 Y u L 7-39 betwee
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L e, I I ' lb t 7-41 Systems that u
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e-. . ! hr L3 z i- b: i- b L c i li
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7-45 j I Table 7.5-1. Integrated As
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- isi. c ‘Id i L c 7-47 Although
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e Other e e e On the e 7-49 technol
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t a APPENDICES
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A-3 Appendix A. ISOTOPE SEPARATION
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I] 1- $i ill 8 LI b' The Gas Centri
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id A- 7 The Component Preparation L
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i ?L 1- U t L fl bi L c u La -- ti
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p; ‘U i-- L ,c c Japan A-1 1 Tabl
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13 A-13 L" efficient of the units d
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L L L t I h h u L; _- t f is throug
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u A-1 Aerodynamic Methods 7 Both th
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i i d .- I . ii hi L i: i t ' Li 1
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la t L I I, lj ir 1 Li c I L L' B-1
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i; 1 t u 1 1 B-3 Table 8.5. Reactor
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Table 6-7. Marginal Costs of U308 a
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LJ L L1 a .E 4' P Y W 5 18 2 16 : 0
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Appendix C. DETAILED RESULTS FROM E
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1 i; Li b L lkd t L L I hd I ' L; i
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L c-5 The introduction of the class
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i ' ibd 1 b i L L i L I Li . . b b
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E , 1 ' b _. I ' L 1 b _- i G i' b
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-, ii I ; b i- ii L b 4 i L L i‘
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_- I ii I _ _ I L I td C i b L i, L
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Qulatiw klur W i t y hilt (*I thrmg
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L c c b - i ii L r D-1 Appendix D.
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L L L L [i i” Table D -2. Maximum
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Fig. D-2 (cont.) 25W I I I I I (I)
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[i energy center. It can be seen fr
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L L i il L t W 0-9 Table D-4. Summa
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-- Lid c i' .- .b) i Internal Distr
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It e L L L t u I' f ' ki Federal Ag
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u 1' 1" Outside Organizations (cont
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