ENTRY 41359 20100315 41494135900000001 SUBENT 41359001 20100315 41494135900100001 BIB 13 54 4135900100002 TITLE Measurement of neutron spectra for spherical 4135900100003 critical assemblies of 235-U(90%), 235-U(36%) and 4135900100004 239-Pu(98%) . 4135900100005 AUTHOR (M.I.Kuvshinov, A.M.Shvetsov, V.P.Egorov, 4135900100006 E.F.Fomushkin, V.P.Gorelov, V.I.Il'In, V.F.Kolesov, 4135900100007 A.A.Malinkin, G.N.Maslov, I.G.Smirnov, A.M.Voinov, 4135900100008 A.N.Zakharov) 4135900100009 INSTITUTE (4RUSEPA) 4135900100010 REFERENCE (C,96MITO,2,E-338,199609) Main Reference 4135900100011 (C,97TRIEST,2,1359,199705) Incident neutron spectrum 4135900100012 details for KS-1. First author A.M.Shvetsov. 4135900100013 (W,Fomushkin,20090925) 4135900100014 REL-REF (N,,A.M.Shvetsov+,C,94GATLIN,130,199405) 4135900100015 Details of neutron spectrometer. 4135900100016 FACILITY (REAC,4RUSEPA) Critical Assembly KS-1 4135900100017 INC-SOURCE Critical Assembly KS-1 (90% U-235). 4135900100018 INC-SPECT Measured KS-1 leakage spectrum is presented on 4135900100019 Fig.2.a of C,97TRIEST, Fig.6 of C,96MITO,2,E-338,1996.4135900100020 Unfolded by the measured in the center of critical 4135900100021 assembly values of fission and activation integrals 4135900100022 neutron spectrum in the center of critical assembly is4135900100023 given of Fig.4 of C,96MITO,2,E-338,1996. 4135900100024 Energy spectrum was measured from 0.5 to 8 MeV. 4135900100025 Cf-252 spontaneous fission neutron spectrum was 4135900100026 measured for validation. 4135900100027 DETECTOR (SPEC,PROPC) Proportional gas counter was used to 4135900100028 measure the neutron leakage spectrum of KS-1. 4135900100029 Length of cylinder-cathode - 1 m, internal diameter 4135900100030 7.5 cm, wall thickens 1 mm, material -stainless steel.4135900100031 Tungsten wire-anode of 40 microm diameter. High-purity4135900100032 methane as working gas at pressure about 300kPa(3atm);4135900100033 0.4 volume % of He-3 added- for energy calibration by 4135900100034 He-3(n,p)T exothermic reaction ( 0.764 MeV recoil 4135900100035 protons energy peak). At voltage 2.5 kV the energy 4135900100036 resolution 3.8 %, at 3 kV - 4 %. Efficiency of neutron4135900100037 registration high as 1 %. 4135900100038 (IOCH) Small-sized ionization chambers with 4135900100039 metrologically tested layers of U-235,U-238,Pu-239, 4135900100040 Pu-240, Np-237 - for measurement of neutron spectra 4135900100041 in the center of critical assemblies. 4135900100042 ADD-RES Leakage spectra for critical assemblies 4135900100043 KS-2(Pu-239 98%), KS-12 (U-235 36%), KS-1 (U-235 90%).4135900100044 ERR-ANALYS (DATA-ERR) Errors not specified 4135900100045 HISTORY (20000218C) + + Compiled at the CJD + + 4135900100046 (20000218U) Last checking has been done. 4135900100047 (20090918A) M.M. EN-DUMMY=0.0253 eV was corrected into 4135900100048 EN-MEAN=0.5 MeV; MXW -> SPA; 4135900100049 BIB information and reference C,97TRIEST were added 4135900100050 according to comments of E.Fomushkin. 4135900100051 Request for the data of incident spectrum ( KS-1) and 4135900100052 for Cf-252 spon.fiss. neutron spectrum was sent to 4135900100053 E.Fomushkin 25.09.2009. 4135900100054 (20100315A) SPA -> FIS . 4135900100055 STATUS (TABLE) Data are taken from 97TRIEST, vol.1,p.664,1997.4135900100056 ENDBIB 54 0 4135900100057 COMMON 3 3 4135900100058 EN-MEAN EN-MIN EN-MAX 4135900100059 MEV MEV MEV 4135900100060 0.5 0.2 8.0 4135900100061 ENDCOMMON 3 0 4135900100062 ENDSUBENT 61 0 4135900199999 SUBENT 41359002 20100315 41494135900200001 BIB 1 1 4135900200002 REACTION (96-CM-245(N,F),,SIG,,FIS) 4135900200003 ENDBIB 1 0 4135900200004 NOCOMMON 0 0 4135900200005 DATA 2 1 4135900200006 DATA DATA-ERR 4135900200007 B B 4135900200008 1.767 0.063 4135900200009 ENDDATA 3 0 4135900200010 ENDSUBENT 9 0 4135900299999 SUBENT 41359003 20100315 41494135900300001 BIB 1 1 4135900300002 REACTION (96-CM-246(N,F),,SIG,,FIS) 4135900300003 ENDBIB 1 0 4135900300004 NOCOMMON 0 0 4135900300005 DATA 2 1 4135900300006 DATA DATA-ERR 4135900300007 B B 4135900300008 0.93 0.031 4135900300009 ENDDATA 3 0 4135900300010 ENDSUBENT 9 0 4135900399999 SUBENT 41359004 20100315 41494135900400001 BIB 1 1 4135900400002 REACTION (96-CM-247(N,F),,SIG,,FIS) 4135900400003 ENDBIB 1 0 4135900400004 NOCOMMON 0 0 4135900400005 DATA 2 1 4135900400006 DATA DATA-ERR 4135900400007 B B 4135900400008 1.897 0.056 4135900400009 ENDDATA 3 0 4135900400010 ENDSUBENT 9 0 4135900499999 ENDENTRY 4 0 4135999999999