Methods and approaches to provide feedback from nuclear and covariance data adjustment for improvement of nuclear data files

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1 Summary Recrd f the 8 th Meeting f WPEC Subgrup 39 n Methds and appraches t prvide feedback frm nuclear and cvariance data adjustment fr imprvement f nuclear data files OECD/NEA Headquarters, Bulgne-Billancurt, France 1-2 December 2016 The subgrup c-rdinatrs, M. Salvatres and G. Palmitti, welcmed the participants t the meeting (see list in Appendix 1). O. Cabells acts as Secretary. The prpsed agenda was adpted (see Appendix 2). 1. REVIEW OF ACTIONS M. Salvatres and G. Palmitti welcmed the participants and reviewed the actins agreed at the previus meeting. Finalise deliverables Actin NEA: T edit and publish by next meeting the reprt based n the last versins ( Summary f Methdlgy and Cmments n Cvariance Data ) prvided by K. Ykhama and M. Ishikawa (JAEA). > Cmments/Status-f-the-wrk: First Intermediate reprt ready t be published in Actin E. Ivanv: T finalise the reprt n MC sensitivity cefficients. Update sme bibligraphic references in the reprt. T be dne by next meeting. > Cmments/Status-f-the-wrk: Draft is in prgress. See presentatin in this meeting. Actin S. Pellni: T cmplete the reprt n PIA methd utilizatin (adjusted results fr mre reactins etc.) and pssibly t cntribute t prpagatin experiments analysis and sensitivity cefficient data bases implementatin. T be dne by next meeting. > Cmments/Status-f-the-wrk: Draft in prgress. See presentatin in this meeting. Actin H. Wu: T finalise the reprt n Stress Test n 235 U(n, f) in adjustment with HCI and HMI benchmarks T be dne by next meeting. > Cmments/Status-f-the-wrk: First draft received 08/12/2016, new versin f the reprt prepared fr ND2016. The cmparisn f U-235 alpha value was included. Actin A. Barnes/Others: Prduce reprt n the status f uncertainties f Am-241. Initiate by criticality safety prblem fr space applicatin. Prgress n this actin shuld be reprted at the next meeting. > Cmments/Status-f-the-wrk: On ging. Current activities: Methdlgies and Experimental Benchmarks Actin G. Palmitti, Others: Develpment f imprved criteria fr adjustment reliability (frm methdlgy studies). Prgress t be reprted at next meeting. > Cmments/Status-f-the-wrk: On ging. 1

2 Actin M. Aufier/G. Palmitti: Cntinue t develp cntinuus energy data assimilatin techniques. Pssible applicatin t a simple, few istpe cases. T be reprted at next meeting. > Cmments/Status-f-the-wrk: On ging. Actin I. Kdeli: Prvide sensitivities f ASPIS experiment. > Cmments/Status-f-the-wrk: Dne. Actin All: Analysing and using new experiments f elemental and separatin f effects type: PROTEUS, FCA-IX, SEG, ASPIS-88, SNEAK, and MANTRA. This is the key actin fr SG39. At present, cmmitment nly by INL (G. Palmitti). > Cmments/Status-f-the-wrk: Dne. See presentatin in this meeting. Actin All: Prviding supprt fr new industrial emerging needs helping fr data uncertainty reductin (e.g. TWR). > Cmments/Status-f-the-wrk: On ging. Actin B.T. Rearden/ORNL: Prvide SCALE6.2 cvariance data in 33 grups fr SG39. By next meeting. > Cmments/Status-f-the-wrk: T be prvided in May Starting frm CIELO new files (withut uncertainties) attempt new adjustment: Actin S. Kahler, G. Palmitti: Prcessed CIELO (and ENDF/B-VII.0) infinite dilutin crss sectins in the standard 33 grups will be available fr SG39. Prvide feedback by energy range, reactin, and istpe using sensitivity database and C/E develped by SG39. > Cmments/Status-f-the-wrk: Dne. See presentatins in this meeting. Actin G. Palmitti, I Kdeli, Others: Perfrm extended adjustment using mre elemental type f integral experiments and new adjustment strategies using CIELO data. > Cmments/Status-f-the-wrk: Dne. See presentatins in this meeting. Actin CIELO/SG39: Expecting feedback frm CIELO in terms f mre cmplete and reliable cvariance data in the next future. Pssible first CIELO cvariance data release by March > Cmments/Status-f-the-wrk: On ging. See presentatins in this meeting. 2. PRESENTATIONS 2.1 Sessin n Methds SG39-1: Detailed cmparisn f Prgressive Incremental Adjustment (PIA) sequence results invlving adjustments f spectral indices and clant density effects n the basis f the SG33 benchmark S. Pellni presented results using different sequences f PIA methdlgy t test the impact f simultaneus assimilatin versus the incremental adjustment, the imprtance f iteratins and the effect f reversed rder in the sequences. Clearly, this analysis will permit t reject the adjustment when it depends n the sequence. This incnsistency can be explained because there are cnflicting effects between different steps, and/r the psteriri sensitivity cefficients are als dependent f the sequence. G. Palmitti remarked the imprtance f the rder in the sequences. He als mentined that the trend in χ 2 culd shw the reliability f the PIA technique, and the imprtance t see the change f the sensitivities in the iterative prcess. 2

3 SG39-2: ND assessment alternatives: Validatin matrix vs XS adjustment First, E. Ivanv presented a general verview and general remarks n validatin cnceptual system. The traditinal apprach and data assimilatin was discussed. It was remarked the imprtance f integral experiments (IEs) crrelatins and the prgressive apprach using dedicated IEs. It was shwn hw in the Bayesian methdlgy, the parameters t determine the Bias and the Uncertainty f the Bias are different. The incnsistency t predict the sensitivity cefficients with different cmputatin apprach wuld affect these calculatins. Different metrics, such as the uncertainty reductin factrs r the bias ranking factrs, can be used t measure the uncertainty reductin f prir uncertainty giving enugh infrmatin fr validatin f nuclear data and criteria f the selectin f integral experiments. M. Salvatres pinted ut the imprtance f this wrk t prvide guidelines r prtcls t select benchmarks and hw t use sensitivities. SG39-3: Implementatin f Resnance Parameter Sensitivity Cefficients Calculatin in CE TSUNAMI-3D V. Sbes presented the implementatin f the resnance parameter sensitivity cefficients in CE TSUNAMI-3D. The main advantages f this methdlgy lie in a cntinuus energy physics treatment and the calculatin f resnance parameters n-the fly. In additin, the Dppler bradening can be perfrmed analytically allwing fr n the fly temperature calculatin. 2.2 Sessin n Experiment analysis, sensitivity calculatins and benchmarks SG39-4: Benchmark tests f ENDF/B-VIII.0 beta 1 using sdium vid reactivity wrth f FCA-XXVII-1 assembly K. Ykyama, (in place f M. Fukushima, JAEA), presented the sdium-vid reactivity wrth f FCA XXVII-1 benchmark with high sensitivity t 235 U capture crss sectin arund 3 kev. Replacement frm ENDF/B-VII.1 t ENDF/B-VIII.0b1 increases vid reactivity wrth with a very high imprvement mainly caused by lwer 235 U capture arund kev regin, ~ 20% smaller. 2.3 Sessin n Adjustments SG39-5 Crss-sectin adjustment based n JENDL-4.0 using new experiments n the basis f the SG33 benchmark K. Ykyama presented the crss-sectin adjustment adding fur additinal integral experiments (PROTEUS 7 and 8, SNEAK 7A and 7B) n the basis f the twenty SG33 benchmarks. C/E values are cnverted int thse with JENDL-4.0 using sensitivity cefficients. It can be seen that the additin f PROTEUS wrsens the C/E values f ZPPR-9 sdium vid wrth. This effect is mainly caused by adjusting 238 U inelastic scattering crsssectin. Fr the mst imprtant crss-sectins, the change due t different evaluatins (ENDF/B-VII.1, VIII.0b1, VIII.0b3 and CIELO) and the calculated adjustment are shwn. SG39-6: Cmparisn f adjustment trends with the CIELO evaluatin S. Pellni presented the results with asympttic GLLS methdlgy using PIA sequence f 4 cnfiguratins and 14 integral experiments (spectral indexes and clant density effects). The adjustment reprduces the data frm CIELO, and shws cnsistency with the difference between evalautins. Hwever, the 238 U inelastic crss-sectin des cnsistently nt reprduce CIELO. Additinal assimilatins f SNEAK 7A and 7B spectral indexes were investigated. 3

4 SG39-7: Expanded adjustment in supprt f CIELO initiative G. Palmitti presented the results f adjustment cmpared against CIELO (ENDF/B-VII0b3) and JEFF-3.3T2. The classical SG33 set f integral experiments in the fast energy range was enlarged with new mre fcused experiments (SEG, FCA-IX, PROTEUS, MANTRA, and ASPIS-88). Majr findings and feedbacks were reprted fr these five istpes (e.g. reductin f 5-10% fr 238 U inelastic crss-sectin). Sme discrepancies with the current prpsed CIELO and JEFF-3.3 evaluatins were als fund and will be submitted t CIELO fr cmments. SG39-8: First preliminary results f the adjustment exercise using ASPIS Fe88 and SNEAK-7A/7B keff & beff benchmarks I. Kdeli presented preliminary results f adjustment using keff, shielding and βeff Benchmarks prviding a cmplementary view and wider scpe f validatin. Adjustments fr 56 Fe and 238 U were shwn. At the next meeting, it will be discussed n hw t harmnise the effrts n the adjustments in rder t prvide a cncerted feedback t the CIELO cmmunity. 2.4 Future Actins and Deliverables SG39-9: Discussin n future f SG39 and pssible new subgrup G. Palmitti presented the future steps fr ending SG39, with a tentative date fr the final deliverable in May A new prpsal f SG was presented entitled: Efficient and effective use f integral experiments fr nuclear data validatin. This new SG shuld fcus n frmalizing and applying a mre rbust methdlgy fr ND validatin using an apprpriate selectin f integral experiments t avid cmpensatins and prviding guidelines n hw t use sensitivities and cvariances and t prvide the backgrund fr an updated set f target accuracies. SG39-10: WPEC sub-grup prpsal: Investigatin f Cvariance Data in General Purpse Nuclear Data Libraries V. Sbes presented the prpsal fr the new WPEC/Subgrup. The main bjectives f this SG will be the develpment f methds fr systematic and cnsistent evaluatin f cvariance data fr the entire energy range, deliver examples f the applicatin f the prpsed methdlgy n a few selected istpes, and prvide an verview f the best practices f hw t generate mre cnsistent cvariance data sets. A tentative schedule and list f deliverables and participants were presented. 2.5 Cllabratin with ther SGs r EGs A. Plmpen, Chair f JEFF, presented the status f 238 U evaluatin fcusing n the new data in the RRR/JRC and URR/JRC. Regarding URR/JRC, between 20keV-149keV, he said that it wuld be the new Standard-2016 fr 238 U capture crss-sectin. He als mentined the status f the JEFF-3.3 evaluatin and hw the new URR/JRC has been discarded because it has a very negative reactivity impact in Big-ten and ther IMF benchmarks, shwing a large cmpensating effect between U5-U8 evaluatins which may cause fictitius alteratins f crss-sectins by the cancellatin f ther effects. After the meeting, O. Cabells suggested t use the Adjustment Methdlgy t re-evaluate bth files and see hw relevant is the crss-crrelatin between U5-U8 due t the U238-URR. 4

5 2.6 Perspectives and review f pending actins Finalise deliverables Actin NEA: T publish the intermediate reprt n Summary f Methdlgy and Cmments n Cvariance Data befre next meeting. T advertise this reprt within the ND cmmunity interested in. Actin NEA: T prepare H. Wu s reprt accrding with the OECD/NEA template. Actin S. Pellni: T finalise the reprt n PIA methd utilisatin. Actin E. Ivanv: T finalise the reprt n MC sensitivity cefficients. T include in the reprt the imprtance f crrelatins. Current activities: Methdlgies and Experimental Benchmarks Actin NEA: Rez s Benchmark n neutrn spectra measurement in irn assemblies that culd be used in SG39 if the cmplete infrmatin f the Benchmark will be available by February NEA will fllw the status f this wrk. Actin M Hursin: Update HCLWR-PROTEUS dcuments and data fr SG39 (received 09/01/2017). Actin I. Kdeli/E. Ivanv: Prvide MCNP inputs fr SNEAK fr intercmparisn. Starting frm CIELO new files (withut uncertainties) attempt new adjustment Actin K. Ykyama/G. Palmitti: Review CIELO adjustments, and mre cmplete feedback fr CIELO. All: Final adjustment fr CIELO and cmments/descriptin t be included in the Final Reprt. All/NEA: Checking/prvide NJOY inputs fr CIELO files. All/NEA: Checking/prvide inputs used in the SG39 benchmarks. All/NEA: Fr any new adjustment it is underlined the imprtance f updated cvariance data (including crss-crrelatin between istpes). Update SG39 website with papers r reprts n verifying cvariance data. 3. NEXT MEETING It is prpsed t hld the next SG39 meeting in cnjunctin with WPEC meetings during the next WPEC Nuclear Data Week at the OECD Headquarters, May 16-17, 2017; and schedule a jint sessin with SG40/CIELO. Finally, the participants in the meeting agree t extend the technical activities f SG39 during 2017, in clse cllabratin with SG40, and t present the Final Reprt in May

6 Appendix 1 Participants t the 8 th meeting f WPEC subgrup 39 CHINA Dr Wenming WANG CIAE eaglewwm@gmail.cm FRANCE Dr Evgeny IVANOV Tel.: IRSN evgeny.ivanv@irsn.fr JAPAN Mr Kenji YOKOYAMA Tel.: Japan Atmic Energy Agency ykyama.kenji09@jaea.g.jp SLOVENIA Ivan-Alexander KODELI Tel.: Institut Jzef Stefan ivan.kdeli@ijs.si SWITZERLAND Mathieu HURSIN Tel.: Paul Scherrer Institut mathieu.hursin@psi.ch Dr Sandr PELLONI Tel.: +41 (0) Paul Scherrer Institut sandr.pellni@psi.ch UNITED STATES Dr Giuseppe PALMIOTTI Tel.: INL/EROB giuseppe.palmitti@inl.gv Prf. Massim SALVATORES Tel.: Idah Natinal Labratry /EROB salvatresmassim@range.fr Dr Vladimir SOBES Tel.: Oak Ridge Natinal Labratry sbesv@rnl.gv INTERNATIONAL ORGANISATIONS Eurpean Cmmissin Jint Research Centre, Geel Dr Arjan PLOMPEN Tel.: +32 (14) EC Jint Research Centre arjan.plmpen@ec.eurpa.eu OECD Nuclear Energy Agency Data Bank, Bulgne-Billancurt Mr Oscar CABELLOS DE FRANCISCO Tel.: +33 (0) OECD/NEA Data Bank scar.cabells@ecd.rg 6

7 Appendix 2 Prpsed Agenda SG-39 NEA Headquarters 46 quai Alphnse Le Gall, Bulgne-Billancurt, France Rm BB 10 Please nte: Only registered participants with a valid ID card r passprt will be allwed access t NEA premises Thursday, December 1, :45 14:30 Welcme and actins review Giuseppe PALMIOTTI Massim SALVATORES Oscar CABELLOS Methds 14:30 15:00 Detailed cmparisn f Prgressive Incremental Adjustment (PIA) sequence results invlving adjustments f spectral indices and clant density effects n the basis f the SG33 benchmark. 15:00 15:30 ND assessment alternatives: Validatin matrix vs XS adjustment 15:30 16:00 "Implementatin f Resnance Parameter Sensitivity Cefficients Calculatin in CE TSUNAMI-3D" 16:00 16:30 Cffee Break Sandr PELLONI Evgeny IVANOV Vladimir SOBES Experiment analysis, sensitivity calculatins and benchmarks 16:30 17:00 Benchmark tests f ENDF/B-VIII.0 beta 1 using sdium vid reactivity wrth f FCA-XXVII-1 assembly 17:00-17:45 Discussin n future f SG39 and pssible new subgrup 17:45 Adjurn Kenji YOKOYAMA (in place f M. Fukushima, JAEA) All 7

8 Adjustments Friday, December 2, :00 9:30 Crss-sectin adjustment based n JENDL-4.0 using new experiments n the basis f the SG33 benchmark 9:30 10:00 Cmparisn f adjustment trends with the Ciel evaluatin 10:00 10:45 Expanded adjustment in supprt f CIELO initiative 10:45 11:15 Cffee Break Discussin n perspectives and actins 11:15 11:45 WPEC sub-grup prpsal: Investigatin f Cvariance Data in General Purpse Nuclear Data Libraries 11:45-13:15 Lunch Break 13:15 14:00 Date and place f the next meeting, any ther business 14:00 Meeting clsing Kenji YOKOYAMA Sandr PELLONI Giuseppe PALMIOTTI Vladimir SOBES 8

Methods and approaches to provide feedback from nuclear and covariance data adjustment for improvement of nuclear data files

Methods and approaches to provide feedback from nuclear and covariance data adjustment for improvement of nuclear data files Summary Recrd f the 9 th Meeting f WPEC Subgrup 39 n Methds and appraches t prvide feedback frm nuclear and cvariance data adjustment fr imprvement f nuclear data files OECD/NEA Headquarters, Bulgne-Billancurt,