Second IP EUROTRANS Internal Training Course

1. Status of Pb and Bi nuclear data in resonance region for XT-ADS and EFIT design. Mihail Todorov INRNE-BAS, Tzarigradsko Shaussee Blvd, №72, 1784 Sofia, Bulgaria. todoroff@inrne.bas.bg www.todoroff.tk www.todorov.tk Second IP EUROTRANS Internal Training Course Nuclear Data for Transmutation: status, needs and methods Santiago de Compostela (Spain)June 7 - 10, 2006 www.todorov.tk

2. Why Lead and Bismuth • Materials with new important assignment • Suggested as material for spallation target • Experimental data is very old • Evaluations have distinctions Second IP EUROTRANS Internal Training Course Nuclear Data for Transmutation: status, needs and methods Santiago de Compostela (Spain)June 7 - 10, 2006 www.todorov.tk

3. ADS concept Accelerator-driven systems for transmutation of nuclear waste have been suggested as solution to the problem of nuclear spent fuel. Construction of subcritical system involves suggestion of new materials such as lead and bismuth for spallation target as well as coolant and moderator At present, the accuracy of nuclear data seems to be enough to design ordinary fission reactors, but for innovative ADS more accurate data are needed for nuclides, which have not yet played important roles in ordinary reactors. Ansaldo nucleare EFIT: Reactor Block Second IP EUROTRANS Internal Training Course Nuclear Data for Transmutation: status, needs and methods Santiago de Compostela (Spain)June 7 - 10, 2006 www.todorov.tk

4. Euratom Sixth Framework Programme project EUROTRANS Advanced design of eXperimental facility demonstrating the technical feasibility of Transmutation in an Accelerator Driven System (XT-ADS) The major objectives of DM5 NUDATRA is completion of evaluated nuclear data libraries and reaction models for materials relevant for the design and optimization of ADS. Second IP EUROTRANS Internal Training Course Nuclear Data for Transmutation: status, needs and methods Santiago de Compostela (Spain)June 7 - 10, 2006 www.todorov.tk

5. NUDATRA Partners • CEA DIF Bruyères-le-Châtel, France • Universidad de Sevilla, Spain • Technische Universität Wien, Austria • Institute for nuclear Research and Nuclear Energy, Bulgaria • Nuclear Research and Consultancy Group NRG, Petten, Netherland Second IP EUROTRANS Internal Training Course Nuclear Data for Transmutation: status, needs and methods Santiago de Compostela (Spain)June 7 - 10, 2006 www.todorov.tk

6. Improvement of Pb and Bi nuclear data is part of our participation Discrepancies in the nuclear data for 207Pb and 209Bi • INRNE and Neutron Data Lab take part of EUROTRANS (NUDATRA) project as participant P20 • Our task is to collect all Pb, Bi and Am evaluated and experimental nuclear data, examine quality of files, resonance parameters, make valuations • To give recommendation for future evaluations or experimental work Second IP EUROTRANS Internal Training Course Nuclear Data for Transmutation: status, needs and methods Santiago de Compostela (Spain)June 7 - 10, 2006 www.todorov.tk

7. Evaluated nuclear data files for 206Pb • ENDF/B-VI evaluation is made by M.B. Chadwick, P.G. Young (LANL), and A.J. Koning (ECN), August 1996 and up to 900keV JEFF-31 and JEFF-3.1/A duplicate it. Resonance information is based on Larson and Horen (>70 keV), and Mughabghab (<70 keV) • JENDL-3.3 is evaluated by M.Mizumoto (JAERI) and compiled by K.Shibata. Resolved resonance parameters obtained by Reich-Moore formula were evaluated from the data of Horen+79, and Mizumoto+79 Comparison between ENDF/B-VI and JENDL-3.3 206Pb total cross-section in the energy interval 480-500KeV 10% Second IP EUROTRANS Internal Training Course Nuclear Data for Transmutation: status, needs and methods Santiago de Compostela (Spain)June 7 - 10, 2006 www.todorov.tk

8. Evaluated nuclear data files for 207Pb From 0 to 475keV ENDF/B-VI cross section data is exactly the same as JEFF-31 and JEFF-3.1/A • ENDF/B-VI evaluation is made by M.B. Chadwick, P.G. Young and A.J. Koning produced in Los Alamos in cooperation with ECN Petten, August 1996. JEFF-31 Revision 1 is made by A.J. Koning in NRG Petten. Reich-Moore resolved resonance parameters were adopted from the ENDF/B-VI.8 evaluation based on Horen and Larson below 70 keV, and Mughabghab above 70 keV • JENDL-3.3 file was evaluated by M.Mizumoto (JAERI), Jul87. Later resonance parameters were corrected by T.Nakagawa. Parameters were based on the data of Horen and recommendation of Mughabghab. Parameters of dummy resonances were taken from ENDF/B-VI evaluation. Comparison between ENDF/B-VI and JENDL-3.3 207Pb total cross-section in the energy interval 440-470KeV Second IP EUROTRANS Internal Training Course Nuclear Data for Transmutation: status, needs and methods Santiago de Compostela (Spain)June 7 - 10, 2006 www.todorov.tk

9. Evaluated nuclear data files for 208Pb 208Pbneutron data are quite different for common libraries. • ENDF/B-VI concurs with JEFF-31 from 0 to 1MeV. ENDF/B-VI evaluation is made by M.B. Chadwick, P.G. Young (LANL), and A.J. Koning (ECN) in August 1996 • JENDL-3.3 file was evaluated by M.Mizumoto (JAERI) and compiled by K.Shibata in 2001. Resolved resonance parameters were adopted from Horen and Mughabghab, corrected by T.Nakagawa • BROND-2 evaluation is made by Blokhin A.I, Belanova T.S, Titarenko N.N. MLBW formula is used. Parameters were evaluated from the data of Bilpuch, Horen, Maclin and Mizumoto Comparison between ENDF/B-VI and JENDL-3.3 208Pb total cross-section in the energy interval 900-1000KeV Second IP EUROTRANS Internal Training Course Nuclear Data for Transmutation: status, needs and methods Santiago de Compostela (Spain)June 7 - 10, 2006 www.todorov.tk

10. Evaluated nuclear data files for 209Bi • ENDF/B-VI evaluation is made by M.B. Chadwick,P.G.Young A.Smith, July 1999 • JEFF MLBW resonance parameters were adopted from the JENDL-3.3 evaluation made by N.Yamamuro, A.Zukeran, May 1989. Parameters were mainly taken from the work of Mughabghab • BROND-2 evaluation made by Blokhin A.I, Belanova T.S, Titarenko N.N. MLBW formula is used. Parameters were evaluated from the data of Horen, Maclin, Allenand and Mizumoto. Comparison between ENDF/B-VI and JENDL-3.3 209Bi total cross-section in the energy interval 200-270KeV Second IP EUROTRANS Internal Training Course Nuclear Data for Transmutation: status, needs and methods Santiago de Compostela (Spain)June 7 - 10, 2006 www.todorov.tk

11. Calculation of resonance parameters for 208,207,206Pb Several nuclei and libraries are compared to give more detailed picture of nuclear data status. Inventory of nuclear data for several lead isotopes. Second IP EUROTRANS Internal Training Course Nuclear Data for Transmutation: status, needs and methods Santiago de Compostela (Spain)June 7 - 10, 2006 www.todorov.tk

12. Calculation of resonance parameters for 208,207,206Pb Calculation of <D> (average width between resonances) is performed by simple arithmetic mean of observed resonances: , where Di=Ei+1-Ei; N is number of resonances (items), E1 and EN are respectively the first and the last resonance in the expected energy interval. The same procedure is performed for Γγ and Γn Strength function - is reckoned by: is reduced neutron width is penetrability coefficient Second IP EUROTRANS Internal Training Course Nuclear Data for Transmutation: status, needs and methods Santiago de Compostela (Spain)June 7 - 10, 2006 www.todorov.tk

13. Calculation of resonance parameters for 208,207,206Pb The average resonance parameters of 206Pb for RRR calculate from data of several libraries ! The average resonance parameters of 207Pb for RRR calculate from data of several libraries Second IP EUROTRANS Internal Training Course Nuclear Data for Transmutation: status, needs and methods Santiago de Compostela (Spain)June 7 - 10, 2006 www.todorov.tk

14. Calculation of resonance parameters for 208,207,206Pb The average resonance parameters of 208Pb for RRR calculate from data of several libraries. Number of resonances included in calculation Second IP EUROTRANS Internal Training Course Nuclear Data for Transmutation: status, needs and methods Santiago de Compostela (Spain)June 7 - 10, 2006 www.todorov.tk

15. Summary Review of evaluated nuclear data files for several Lead and Bismuth nuclei was done. In addition basic information is given for status of data. Averaging for resonance parameter in RRR was performed which gives an idea for quality of the data and distinction between different libraries, major differences are: • Γγ for all nuclei is two-three or more times greater for variety of libraries • Strength function for 206Pb in JENDL is 50% higher than ENDF/B • Strength function for207Pb in BROND is more than 10% higher than others Second IP EUROTRANS Internal Training Course Nuclear Data for Transmutation: status, needs and methods Santiago de Compostela (Spain)June 7 - 10, 2006 www.todorov.tk

16. Summary • The accurate measurement of Pb and Bi cross sections is important to improve the accuracy of the evaluated nucleardata • Evaluations were based on the data of Horen 78 • New resonance analysis is necessary in low energy region on the base of existing new measurements in CERN n-TOF and Gelina Belgium from 2004 • Accuracy valuation required from the design is need for success of nuclear data evaluation activity. Second IP EUROTRANS Internal Training Course Nuclear Data for Transmutation: status, needs and methods Santiago de Compostela (Spain)June 7 - 10, 2006 www.todorov.tk

17. Inventory of Bi resonance parameters Second IP EUROTRANS Internal Training Course Nuclear Data for Transmutation: status, needs and methods Santiago de Compostela (Spain)June 7 - 10, 2006 www.todorov.tk