ID | 4 |
---|---|
Type | |
Target | 92-U-235 |
Reaction | (n,f) |
Quantity | prompt g - Prompt gamma production |
Incident energy | Thermal - Fast |
Accuracy | 7.5 % |
Secondary Energy/Angle | Eg=0-10MeV |
Field(s) | Fission |
Subfield | LWR, Gen-IV |
Accepted date | 12-May-2006 |
Status | Work in progress |
Latest review date | 22-Apr-2022 |
Prof. Gerald RIMPAULT at CAD-DER, FR
Project (context)JEFF, NEA WPEC Subgroup 27
ImpactThe four fast reactor systems of GenIV feature innovative core characteristics for which gamma-ray heating estimates for non-fuel zones require an uncertainty of 7.5% [1]. For the experimental Jules Horowitz Reactor (RJH) at Cadarache a similar requirement appears [2]. Recent studies show evidence of discrepancies on integral measurement in MASURCA, EOLE and MINERVE, from which it is clear that the expectations for GenIV systems and the RJH thermal reactor are not met [3]. Gamma-ray energy release is dominated by Pu-239 and U-235.
Accuracy7.5% on the total gamma energy
7.5% on multiplicity
Best accuracy achievable for the gamma spectrum shape
Reference 1: G. Rimpault, Proc. Workshop on Nuclear Data Needs for Generation IV, April 2005, Antwerp, Belgium
Reference 2: D. Blanchet, Proc. M&C 2005, Int. Topical Meeting on Mathematics and Computation, Supercomputing, Reactor Physics and Nuclear and Biological Applications, Sep. 2005, Avignon, France
Reference 3: 'Needs for accurate measurements of spectrum and multiplicity of prompt gammas emitted in fission', G. Rimpault, A. Courcelle and D. Blanchet, CEA/Cadarache – DEN/DER/SPRC.
Forty percent of the total gamma-ray energy release results from prompt decay of fission products. No comprehensive analytic expressions exist and Hauser-Feshbach model calculations are involved and presently lack sufficient knowledge to warrant a solution of the problem. New measurements would be needed to guide new evaluation efforts. Present evaluations are based on measurements from the seventies.
Review commentDiscrepancies observed for C/E ratios in various benchmarks range from 10 to 28%. The request is well motivated and based on a considerable effort.
Entry statusWork in progress (as of SG-C review of May 2018)
Pending new evaluation or validation (as of SG-C review of June 2019)
Pending new evaluation or validation (as of SG-C review of May 2021) with recommendations for priority validation of the latest evaluations
Please report any missing information to hprlinfo@oecd-nea.org
Experiments
Theory/Evaluation