ENTRY 23514 20190604 228023514 0 1 SUBENT 23514001 20190603 228023514 1 1 BIB 11 43 23514 1 2 TITLE Measurement of buckling and relative reaction rates in 23514 1 3 some plutonium-graphite assembles 23514 1 4 AUTHOR (D.H.Carter,W.G.Clarke,C.Hunt,J.Marshall,D.B.McCulloch,23514 1 5 J.E.Sanders,C.R.Symons) 23514 1 6 REFERENCE (J,JNE/AB,18,105,1964) 23514 1 7 INSTITUTE (2UK WIN) 23514 1 8 REL-REF (M,,C.J.Campbell+,C,58GENEVA,15,(P10),1958) 15/P10 23514 1 9 Relative fission rates measurement method used is 23514 1 10 similar to one of Campbell+ - thermal comparison. 23514 1 11 . STEWPOT - 43=group diffusion-theory code (mentioned a23514 1 12 "Massimo+, to be published") 23514 1 13 INC-SPECT Lattice spectrum and thermal spectrum 23514 1 14 DETECTOR (FISCH) 1/8 inch diameter, 4ft 6inch long, operate at 23514 1 15 600 deg C temperature, active length 0.4inch. 23514 1 16 METHOD Fission rates were determined at the center of 23514 1 17 graphite filler. 23514 1 18 Thermal calibration before and after experiment. 23514 1 19 CORRECTION Absorption of neutrons by the walls of the chambers 23514 1 20 - of order 1/3 %. 23514 1 21 Self-shielding within the fissile coating of the 23514 1 22 chambers was negligible 23514 1 23 ADD-RES .Reaction rates ratios measured ( Table 9): 23514 1 24 System Temp,K F(Pu239/U235) F(U233/U235) 23514 1 25 PuG1 288 1.330+-0.011 1.175+-0.011 23514 1 26 PuG2 290 1.554+-0.011 1.395+-0.011 23514 1 27 PuG2 473 1.443+-0.029 1.410+-0.022 23514 1 28 PuG2 645 1.184+-0.024 1.430+-0.021 23514 1 29 PuG3 290 1.520+-0.013 1.350+-0.012 23514 1 30 PuG4 291 1.745+-0.017 1.660+-0.015 23514 1 31 PuG5 290 1.790+-0.016 1.885+-0.018 23514 1 32 UG1 291 1.612+-0.015 1.315+-0.013 23514 1 33 Ratios to boron at PuG3 system and 290 deg K: 23514 1 34 F(Pu239/B) F(U235/B) F(U233/B) 23514 1 35 1.520+-0.018 0.988+-0.018 1.334+-0.016 23514 1 36 See Table 1 for Systems used. 23514 1 37 . Where 23514 1 38 F(i/j)=(Ci/Cj lattice spect.)/(Ci/Cj thermal spect.), 23514 1 39 Ci- fission chamber count rate for i= U233,U235,Pu239. 23514 1 40 .Reaction rates ratio uncertainty includes 23514 1 41 counting statistics, 23514 1 42 uncertainty of correction, 23514 1 43 inaccuracies in locating the fission chambers 23514 1 44 HISTORY (20190604C) M.M. 23514 1 45 ENDBIB 43 0 23514 1 46 NOCOMMON 0 0 23514 1 47 ENDSUBENT 46 0 23514 199999 SUBENT 23514002 20190604 228023514 2 1 BIB 4 6 23514 2 2 REACTION (94-PU-239(N,ABS),,ETA,,,DERIV) 23514 2 3 ANALYSIS Derived from measured buckling and calculated data by 23514 2 4 STEWPOT. 23514 2 5 ERR-ANALYS (DATA-ERR) One standard deviation 23514 2 6 STATUS (TABLE) Text of abstract and text page 120 of 23514 2 7 Nucl.Energy,A and B,v.18,p.105,1964 23514 2 8 ENDBIB 6 0 23514 2 9 NOCOMMON 0 0 23514 2 10 DATA 3 1 23514 2 11 EN DATA DATA-ERR 23514 2 12 EV PRT/REAC PRT/REAC 23514 2 13 0.0253 2.11 0.05 23514 2 14 ENDDATA 3 0 23514 2 15 ENDSUBENT 14 0 23514 299999 SUBENT 23514003 20190604 228023514 3 1 BIB 4 6 23514 3 2 REACTION ((94-PU-239(N,ABS),,ETA)/(92-U-235(N,ABS),,ETA)) 23514 3 3 ANALYSIS Derived from measured data for UG1,PuG2,PuG3 and 23514 3 4 spectrum dependence given by the STEWPOT data. 23514 3 5 ERR-ANALYS (DATA-ERR) One standard deviation 23514 3 6 STATUS (TABLE) Text page 121 of 23514 3 7 Nucl.Energy,A and B,v.18,p.105,1964 23514 3 8 ENDBIB 6 0 23514 3 9 NOCOMMON 0 0 23514 3 10 DATA 3 1 23514 3 11 EN DATA DATA-ERR 23514 3 12 EV NO-DIM NO-DIM 23514 3 13 0.0253 1.02 0.02 23514 3 14 ENDDATA 3 0 23514 3 15 ENDSUBENT 14 0 23514 399999 ENDENTRY 3 0 2351499999999