Japanese Nuclear Data Committee Research Articles

JENDL: Nuclear databases for science and technology

It is exactly 50 years since the Japanese Nuclear Data Committee was founded both in the Atomic Energy Society of Japan and in the former Japan Atomic Energy Research Institute. The committee promoted the development of Japan’s own evaluated nuclear data libraries. As a result, we managed to produce a series of Japanese Evaluated Nuclear Data Libraries (JENDLs) to be used in various fields for science and technology. The libraries are categorized into general-purpose and special-purpose ones. The general-purpose libraries have been updated periodically by considering the latest knowledge on experimental and theoretical nuclear physics that was available at the time of the updates. On the other hand, the special-purpose libraries have been issued in order to meet the needs for particular application fields. This paper reviews the research and development for those libraries.

Quality Management System Proposed to JENDL Evaluation Project

A concept of the quality management system proposed for the Japanese Evaluated Nuclear Data Library (JENDL) is described. The concept is based on the process approach established as an International Standard of a quality management system (ISO 9001). In order to discuss how to guarantee the quality of JENDL, a working group focusing on a quality assurance strategy was established in the Japanese Nuclear Data Committee. After three years of discussions, the working group published a report about a quality management system for JENDL and proposed this work to the JENDL evaluation group of the Japan Atomic Energy Agency. The concept of quality management system of JENDL consists of five items: (1) Objective, (2) Organization, (3) Scope, (4) Quality Assurance, and (5) Quality Manual. The concept of the quality management system and the documented procedure have been presented.

シグマ委員会の２００３，２００４年度における核データ研究活動

This technical note summarizes research activities on nuclear data carried out by Japanese Nuclear Data Committee (JNDC) during the fiscal years of 2003 and 2004. During this period, the nuclear data files for special purposes (JENDL-HE-2004 and JENDL-PD-2004) were released. Other activities are described: analysis of post nuclear fuel irradiation experiments, nuclear chart and nuclear data evaluation for astrophysics.

Benchmark problems in nuclear data processing and utilization system for innovative reactors

A nuclear data processing and utilization system has been developed for research and development of innovative reactors such as accelerator-driven systems. The system is able to handle JENDL-3.3, ENDF/B-VI, and JEFF-3.1 to generate pointwise and groupwise cross sections in several formats, and has a capability to perform criticality and shielding benchmarks. Verification of nuclear data is available by using various criticality and shielding benchmark problems selected from database such as ICSBEP and SINBAD. The system performance highly depends on the quality of benchmark problems so that appropriate benchmarks should be selected from existing database. However a number of adequate benchmarks are quite a few to verify nuclear data for application of the accelerator-driven systems. Hence that new measurement should be necessary concerning criticality and shielding benchmarks. In the JENDL high-energy file (JENDL/HE) project, the intermediate-energy nuclear data integral test working group of Japanese Nuclear Data Committee made critical review of existing benchmark problems for accelerator-driven systems and performed verification of nuclear data in JENDL/HE. In this paper, the scheme of benchmark procedure and the selected benchmarks in the nuclear data processing and utilization system have been described.

シグマ委員会の2001, 2002年度における核データ研究活動

シグマ委員会の2001, 2002年度における核データ研究活動

JENDL High Energy File

Nuclear Data Center at Japan Atomic Energy Research Institute is developing the JENDL High Energy File in cooperating with Japanese Nuclear Data Committee. The JENDL High Energy File includes neutron and proton nuclear data 20 MeV to 3 GeV. In this report, reported are evaluation methods and results of the evaluation and benchmark tests for the JENDL High Energy File.

Integral Test of JENDL-3.3 with Shielding Benchmarks

Integral test of neutron and gamma-ray production data for the latest version of Japanese Evaluated Nuclear Data Library, Version 3.3 (JENDL-3.3) has been performed by using shielding benchmarks. An evaluation scheme for shielding benchmark analysis established in Japanese Nuclear Data Committee (JNDC) was applied to the integral test for medium-heavy nuclei such as Aluminum, Sodium, Titanium, Vanadium, Chromium, Iron, Cobalt, Nickel, Copper, Niobium and Tungsten. Calculations were made based on a continuous-energy Monte Carlo code MCNP4B/4C and multi-group discrete ordinates codes ANISN and DORT. The latest version of NJOY99 was employed to generate cross-section libraries for these transport codes. Calculations with JENDL-3.2, ENDF/B-VI, FENDL-1 and FENDL-2 were also made for comparison. In the present study, benchmark results of neutron and gamma-ray production data are shown for Sodium, Iron, Vanadium, Tungsten, Nickel, Titanium, Chromium, Niobium and Cobalt

Development of One Group Constant Library for the Computer Code ORIGEN-2 Using JENDL-3.2

Standard one group constant libraries for the ORIGEN-2 code are prepared using JENDL-3.2 for calculating the amount of nuclides generated in spent fuel of BWR, PWR and FBR, and the adaptability of the libraries is examined for the safety evaluation of the nuclear fuel cycle. This task is performed as a part of the activities of the nuclide generation evaluation working group of Japanese Nuclear Data Committee.

Activity Report of Japanese Nuclear Data Committee in Period of April 1999 to March 2001

Activity Report of Japanese Nuclear Data Committee in Period of April 1999 to March 2001

JSSTDL-300 : The Standard Shielding Cross Section Library Based on JENDL-3.2

A common group cross-section library JSSTDL based on Japanese Evaluated Nuclear Data Library, Version 3 Revision 2 (JENDL-3.2) has been updated in Japan Atomic Energy Research Institute (JAERI) under the cooperation of the Working Group on Standard Group Constants affiliated by the Subcommittee of Group Constants of Japanese Nuclear Data Committee (JNDC). Up to now, JSSTDL-295 based on JENDL-3.2 was developed for shielding applications, however some users pointed out a difficulty of the JSSTDL-295 for applying configurations including polyethylene slabs. It was caused from inadequate group structure for the thermal energy region and the weighting function. In the update version of JSSTDL (JSSTDL-300), we increased number of thermal energy groups from 5 to 10, and also determined the energy boundaries much carefully. The JSSTDL-300 was tested with various shielding benchmark problems, and the validity was confirmed. The integral test scheme established in JNDC was applied in this study. In the present paper, we describe the result of integral test of JSSTDL-300 for applying benchmarks of Japanese-American Shielding Program for Experimental Research (JASPER). It has been concluded that JSSTDL-300 is highly applicable for shielding applications such as configurations in which thermal neutrons were enhanced.

Status of JENDL Photonuclear Data File and Intercomparison with Other Libraries

The Japan Atomic Energy Research Institute (JAERI) Nuclear Data Center has started evaluation work in cooperation with Japanese Nuclear Data Committee (JNDC) to produce a JENDL Photonuclear Data File. The JENDL Photonuclear Data File is provided for applications such as electron accelerator shielding and radiation therapy, and given for gamma-ray induced reactions up to 140 MeV. The photon absorption cross section is evaluated with the giant dipole resonance model and the quasi-deuteron model, and the decaying processes are estimated with the statistical model with preequilibrium correction by using MCPHOTO and ALICE-F codes. The intercomparison has been made of JENDL Photonuclear Data File with other evaluated photonuclear data files such as BOFOD, CNDC, EPNDL, and LANL as well as experimental data available for the important elements.

「シグマ委員会」における核データ収集・評価活動

This report presents the activities of the Japanese Nuclear Data Committee (JNDC) in the period of April 1997 to March 1999. In this period, preparation of the next version of the Japanese Evaluated Nuclear Data Library, JENDL-3.3, has progressed. Generation of the special purpose files also has been advanced. In this report, the activities of each group affiliated by the committee are presented and the following are described as special topics: (1) progress in evaluating JENDL-3.3, (2) production of JENDL Covariance File and its processing system, (3) completion of the JENDL Dosimetry File, and (4) the JENDL FP Decay Data File.

「シグマ委員会」における核データ収集・評価活動 １９９５，１９９６年度の活動報告

This report presents the activities of the Japanese Nuclear Data Committee (JNDC) in the period of April 1995 to March 1997. In this period, the various benchmark tests have been done for the JENDL-3.2 library released in 1994, and some problems inherited in the library have been pointed out and discussed in order to improve the library. On the other hand the special purpose files have been steadily progressed. In this report, the activities of each group under the committee are presented and JENDL-3.3, activation cross section file, high energy nuclear data file, nuclear data for evaluation of radiation damage and one group cross sections for ORIGEN2 code are also presented as topics of the activities.

「シグマ委員会」における核データ収集・評価の活動 １９９３，１９９４年度の作業報告

This is a progress report on the activities of the Japanese Nuclear Data Committee (JNDC) in the period of April 1993 to March 1995. In this period, the latest version of the Japanese Evaluated Nuclear Data Library, JENDL-3.2, has been released for users after benchmark tests of data therein. Preparation of the special purpose nuclear data files has been also progressed. As special topics, the followings are presented here: (1) the completion and benchmark tests of the JENDL-3.2, (2) progress in evaluating special purpose nuclear data, (3) progress in studying high energy nuclear data, and (4) utilization of nuclear data by means of internet.

「シグマ委員会」における核データ収集・評価の活動 １９９１，１９９２年度の作業報告

This is a progress report on the activities of the Japanese Nuclear Data Committee (JNDC) in the period of April 1991 to March 1993. In this period, a revision work of the Japanese Evaluated Nuclear Data Library version 3 (JENDL-3) has been performed and decay heat data based on the JNDC FP Decay Data Library have been approved by the Nuclear Safety Commission as a recommended data for the ECCS safety analysis. Activities of data evaluations for intermediate energy neutron, charged particle and photo nuclear reactions have been progressing to meet the wider range of new requirements for nuclear data. As special topics, the followings are presented here; (1) the status on the revision work proposed to JENDL-3.2, (2) the status of the nuclear data evaluation for intermediate energy region, (3) the Integrated Nuclear Data Evaluation System (INDES), and (4) international cooperation on nuclear data evaluation.

Recommendation on Decay Heat Power in Nuclear Reactors.

A recommendation on the decay heat power in nuclear reactors was issued from the Research Committee on Standardization of the Decay Heat Power in Nuclear Reactors of Atomic Energy Society of Japan (AESJ). The recommendation is based on the summation calculation results with the Japanese Nuclear Data Committee (JNDC) Fission Product (FP) Nuclear Data Library, Version (JNDC-V2) and the recommended data are consisted of tabulated values of decay heat power, its β and γ-ray components, and their accuracies for five fissionable nuclides; 235U, 238U, 239Pu, 240Pu and 241Pu. A set of 33-term exponential polynomials are given to help the users calculating the decay heat power for any irradiation history and cooling time. The time evolution of the energy spectra of the γ-ray component is also given. A realistic estimation of the neutron capture effect on the decay heat power can be obtained by the interpolation of the tabulated data obtained by the summation calculation.

「シグマ委員会」における核データ収集・評価の活動 平成元，２年度の作業報告

This is a progress report on the activities of the Japanese Nuclear Data Committee (JNDC) in the period of April 1989 to March 1991. In this period, JENDL-3 (the Japanese Evaluated Nuclear Data Library, version 3) and the JNDC FP Nuclear Data Library-Version 2 have been released for users after completion of extensive checking and integral tests of the data therein. New activites have been initiated to meet the wider range of new requirements for nuclear data. As special topics, the followings are presented here; (1) the completion of the JENDL-3 FP File, (2) the current status of the Special Purpose Nuclear Data FileS, and (3) international cooperation on nuclear data evaluations.

「シグマ委員会」における核データ収集・評価の活動 昭和６２，６３年度の作業報告

「シグマ委員会」における核データ収集・評価の活動 昭和６２，６３年度の作業報告

ジグマ委員会における核データ収集・評価の活動 昭和６０，６１年度の作業報告

This is a progress report on the activities of the Japanese Nuclear Data Committee (JNDC) in the period of April 1985 to March 1987. As special topics, two prominent results are presented, the oompletion of Japanese Evaluated Nuclear Data Library version 3 (JENDL-3), and plans for the Post-JENDL-3 activity program. In the former, it includes the scope of JENDL3, contribution to the fusion neutronics and some problems between simultaneous evaluations of important nuclides and FBR integral tests. For the latter, the recommendation from the working groups on the special purpose file and on the plan of the Post-JENDL-3 activity are presented. Some remarks for the promotion of the utilization of JENDL are also described.

Activity Report of Japanese Nuclear Data Committee in Period of April 1983 to March 1985

This is a progress report on the activities of the Japanese Nuclear Data Committee (JNDC) in the period of April 1983 to March 1985. Special topics are presented on improvements of the nuclear data evaluation methodology, on the study of nuclear model parameters, and on a development of the cross section sensitivity and adjustment code system. Application of the nuclear data to new fields such as fuel cycle and to medical science is also reported. Moreover, some tasks to promote the distribution and utilization of the Japanese Evaluated Nuclear Data Library (JENDL) are described.