Introduction Arjan Plompen

ANDES WP1Measurements foradvanced reactorsystemsIntroductionArjan Plompen

Task 1.1 High accuracy measurements ofneutron inelastic scattering cross sections• 1.1a Neutron inelastic scattering 238 U• IPHC (A. Bacquias) (IRMM, IFIN-HH)• 1.1b Neutron inelastic scattering Na, Mo, Zr• IRMM (-) (IFIN-HH, IPHC)H. Rouki et al., High resolution measurement of neutron inelastic scatteringcross-sections for 23 Na, Nucl. Instrum. Meth. A672 (2012) 82• 1.1c Covariances for inelastic scattering• IFIN-HH (A. Negreț) (IRMM, IPHC)

Task 1.2 High accuracy measurements ofneutron capture cross sections• 1.2a+b 238 U+ 241 Am capture measurements atGELINA• JRC+CEA (C. Lampoudis) (CIEMAT)• 1.2c+d 238 U+ 241 Am capture measurements atCERN n_TOF• CEA+CIEMAT (D. Cano Ott) (INFN, ITN, JRC)• 1.2e Feasibility surrogate reactions Cm n-capture• CENBG (L. Mathieu) (CEA/DAM, CEA/DEN)

Task 1.3 High accuracy measurements forfission• 1.3a 238 Pu(n,f) through 237 Np( 3 He,pf)• CENBG (-) (IPNO, CEA)• 1.3b Measurements of 240,242 Pu(n,f) vs 238 U(n,f)at IRMM• IRMM (P. Salvador Castiñeira)• 1.3c Measurements of 240,242 Pu(n,f) vs 1 H(n,n) 1 Hat CENBG• CENBG (-) (IRMM)• 1.3d Measurements of 240,242 Pu(n,f) vs 235 U(n,f)at CERN n_TOF• INFN (M. Calviani) (ITN, IRMM)

Task 1.3 High accuracy measurements forfission• 1.3e Improved analysis 241,243 Am(n,f) &245Cm(n,f) cross sections measured at CERNn_TOF• INFN (M. Calviani, as above)• 1.3f Measurements of fission fragment isotopicdistributions and fission probabilities for Np, Pu,Cm• GANIL (C. Rodriguez) (CENBG, IPNO, CEA/DAM, USC)

Task 1.4 High accuracy fission product decaydata measurements for reactor kinetics anddecay heat calculations• 1.4a Total absorption gamma-ray spectroscopy of88Br, 94 Rb, 95 Rb, 137 I• JYU (CIEMAT)• 1.4b b-delayed neutron emission probabilities for88Br, 94 Rb, 95 Rb, 137 I• CIEMAT (JYU)

• DeliverablesList of deliverablesaddresses a large fraction ofthe advanced reactorsystems entries on theHigh priority request list fornuclear data(OECD-NEA, WPEC)First deliverable:INFN/n_TOF (M. Calviani)

Milestones

Requirements and status: 238 U(n,n’)Required: 2-9% (50 keV – 20 MeV)Achieved: 10-30%Limited earlierworkDifficultexperiments

Requirements and status: 238 U(n,g)Required: 1-3% (2-25 keV)Achieved: 3-9% Standards claim about 2%.A lot of workwas doneNew effortneeds toemphasiseaccuracyExample:232Th(n,g)

Requirements and status: 240 Pu(n,f)Required: 2-3% (0.5-6 MeV) (0.5-2 keV: 10-15%)Achieved: 5-6% 20%A lot of workwas doneNew effortneeds toemphasiseaccuracy

Requirements and status: 242 Pu(n,f)Required: 4-10% (0.2-6 MeV)Achieved: 20%A lot of workwas doneNew effortneeds toemphasiseaccuracy

Accuracy & redundancy is needed• Compare different methods• State-of-the-art technique• Interaction between experimental groups•238U(n,n’); 23 Na(n,n’) 238 U(n,g); 241 Am(n,g);240Pu(n,f); 242 Pu(n,f)

Exploratory efforts• Surrogate reactions• Fission: 238 Pu(n,f) by 237 Np( 3 He,pf): target quality! • Capture: can we address Cm(n,g) by this tecnique?• Fission yields: 12 C( 238 U,xf); inverse kinematics andmultiple nucleon transfer reactions; GANIL/VAMOS

Response to SG-25• Fission products• Beta-delayed neutron emission probabilities• Decay data by Total Absorption Calorimetry

Relations to other projects• ERINDA: support of visits to laboratories• EUFRAT: support of visits to laboratories• TRAKULA: 240,242 Pu fission at nELBE• METROFISSION: metrology for fission 240,242 Pu atPTB and NPL• NEA EXFOR and JEFF: use of data for newevaluations

Conclusion• ANDES WP1 Measurements for advanced reactorsystems is an ambitious program to improve theknowledge of cross sections, fission probabilities,fission yields and fission product decay data• Focus on advanced reactor needs• Guided by OECD-NEA subgroup results of theWorking Parties on Evaluation Co-operation• Aims at contributing to improvements inpredictability of safety and performance analyseswith JEFF as a target library