Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Suzuki, Mitsutoshi; Hori, Masato; Aso, Ryoji; Usuda, Shigekazu
Proceedings of INMM 47th Annual Meeting (CD-ROM), 8 Pages, 2006/00
The multiscale statistical process control (MSSPC) method is applied to explain material unaccounted for (MUF) in a large scale reprocessing plant using numerical calculations. Increasing the amount of nuclear material throughput per year, which is more than 5000kgPu in commercial reprocessing plant, the accumulated annual measurement errors will exceed 1SQ (=8kgPu) and frequent Near Real Time Accountancy (NRTA) and process monitoring measures are required to satisfy the IAEA safeguard criteria. In this study, continuous wavelet functions are used to decompose the process data, which is simulated batch operation mode superimposed by various types of disturbance, and the disturbance components constituting the data are divided into both time and frequency region. Because MSSPC based on wavelet decomposition provides efficient performance over a wide range of abnormal events, the protracted or abrupt diversion loss, not known a priori, can be detected for nuclear safeguards purpose. The diagnosis for MSSPC is applied to distinguish an abnormal event from the normal data and shows how to detect both types of diversion loss using principle component analysis (PCA). MUF data is generally supposed to be autocorrelated time series data. Quantitative performance of MSSPC for the time series data is shown with the average run lengths simulated by Monte-Calro calculation to compare the nondetection probability B. Recent discussion about bias corrections (BC) in material balances is introduced and other approach is presented to evaluate MUF in an explanatory manner without an adoption of BC.
Sumi, Mika; Kageyama, Tomio; Suzuki, Toru; Manson, P.*; Neuhoff, J.*
Proceedings of INMM 47th Annual Meeting (CD-ROM), 7 Pages, 2006/00
All accountancy analyses at the Plutonium Fuel Development Center (PFDC) of JAEA are performed by isotope dilution mass spectrometry (IDMS) with well-characterized standard materials, which prepared at PFDC itself from Pu and U reference materials. Currently, Pu reference materials must be obtained from foreign suppliers because there are no facilities in Japan with the capability for preparation and supply of Pu reference materials, and, importing those Pu reference materials is gradually becoming more difficult. Therefore, JAEA has started collaborative work with NBL for the preparation of Pu reference materials and associated Large Size Dried (LSD) spike. MOX powder which has been stored in JAEA was dissolved and ion-exchange was performed to obtain purified Pu solution at JAEA. Several aliquots had taken from the solution, dried, and sent to NBL for analysis. Pu samples were shipped and have arrived to NBL. After certification analysis on NBL, the Pu nitrate solution will be mixed with a U nitrate solution which prepared from CRMs. The uncertainty of the purified Pu solution and prepared LSD spikes will be evaluated by GUM method. This paper presents the present status and future plans for the collaboration work.
Dosho, Hisaharu
Proceedings of INMM 47th Annual Meeting (CD-ROM), 8 Pages, 2006/00
This paper introduces current status on the activities of two organizations, including the cooperation between them. It is the new challenge of Japan to develop human resources who can carry out responsible activities for the compatibility between peaceful use of nuclear energy and nuclear nonproliferation by using the related knowledge on both policies and technology.
Inoue, Naoko; Hori, Keiichiro; Dosho, Hisaharu; Ota, Kiyokazu*; Otsuka, Naoto; Aso, Ryoji; Senzaki, Masao
Proceedings of INMM 47th Annual Meeting (CD-ROM), 6 Pages, 2006/00
no abstracts in English
Kurasaki, Takaaki*; Dosho, Hisaharu; Ota, Kiyokazu*; Hori, Keiichiro; Kuribayashi, Toshihiro; Otsuka, Naoto
Proceedings of INMM 47th Annual Meeting (CD-ROM), 8 Pages, 2006/00
no abstracts in English