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Nagatani, Taketeru; Nakajima, Shinji; Kawakubo, Yoko; Shiromo, Hideo; Asano, Takashi; Marlow, J.*; Swinhoe, M. T.*; Menlove, H.*; Rael, C.*; Kawasue, Akane*; et al.
Book of Abstracts, Presentations and Papers of Symposium on International Safeguards; Linking Strategy, Implementation and People (Internet), 8 Pages, 2015/03
Nakajima, Shinji; Nagatani, Taketeru; Asano, Takashi; Kawasue, Akane*; Iso, Shoko*; Kumakura, Shinichi*; Watanabe, Takehito*; Marlow, J. B.*; Swinhoe, M. T.*; Menlove, H. O.*; et al.
Kaku Busshitsu Kanri Gakkai (INMM) Nihon Shibu Dai-34-Kai Nenji Taikai Rombunshu (Internet), 9 Pages, 2013/10
The Advanced Verification for Inventory Sample System (AVIS) is a nondestructive assay (NDA) system in order to verify the plutonium mass in the small MOX samples at Japan Nuclear Fuel Limited (JNFL) MOX fuel fabrication plant (J-MOX) under construction. The AVIS is required the high measurement performance because the AVIS will be used as a verification tool to substitute destructive analysis for a part of the samples which needs the bias defect verification. Therefore, the AVIS will fulfill an important role in the safeguards approach for J-MOX. Japan Atomic Energy Agency (JAEA) conducted the performance test of the AVIS under the contract with NMCC. As the results of these tests, we confirmed that the AVIS could almost satisfy the required performance by IAEA.
Nakajima, Shinji; Nagatani, Taketeru; Asano, Takashi; Marlow, J. B.*; Swinhoe, M. T.*; Menlove, H. O.*; Rael, C. D.*; Kawasue, Akane*; Iso, Shoko*; Kumakura, Shinichi*; et al.
Proceedings of INMM 54th Annual Meeting (CD-ROM), 10 Pages, 2013/07
The advanced verification inventory system (AVIS) is a nondestructive assay (NDA) system developed by Los Alamos National Laboratory (LANL) to measure small samples of bulk plutonium and uranium mixed oxide (MOX) powder and pellets at the Japan Nuclear Fuel Limited (JNFL) mixed oxide fuel fabrication plant (J-MOX). In order to mitigate the workload on the Rokkasho On-Site Laboratory (OSL), it is intended that the AVIS measurement will be substituted for a part of the Destructive Assay (DA) for J-MOX. Based on the commission from Office for Nuclear Non-Proliferation and Safeguards (JSGO) of Ministry of Education, Culture, Sports, Science and Technology (MEXT) and Nuclear Material Control Center (NMCC), Japan Atomic Energy Agency (JAEA) has conducted the performance test of the AVIS in order to confirm the system performance before installation at the J-MOX site. The performance test consists of two phases. In the phase 1 test, detector parameters such as detector efficiency and die-away time were evaluated by using a californium-252 neutron source. These results agreed well with design value and were reported at the 53rd INMM annual meeting. JAEA conducted the phase 2 test by using MOX materials in order to evaluate the total measurement uncertainty (TMU). In the test, influence of sample density, plutonium concentration and organic additives in samples were also evaluated. Consequently, it is expected that AVIS can achieve the target TMU of 0.5% required in user requirement of IAEA by optimizing measurement condition and by using well-characterized standards. This paper provides a summary of the results of comprehensive performance test of AVIS.
Nagatani, Taketeru; Nakajima, Shinji; Asano, Takashi; Marlow, J. B.*; Swinhoe, M. T.*; Menlove, H. O.*; Rael, C. D.*; Kawasue, Akane*; Iso, Shoko*; Kumakura, Shinichi*; et al.
Proceedings of INMM 53rd Annual Meeting (CD-ROM), 9 Pages, 2012/07
The advanced verification for inventory sample system (AVIS) is a nondestructive assay (NDA) system designed to measure small samples of bulk plutonium uranium mixed oxide (MOX) powder and pellets at the proposed Japan Nuclear Fuel Limited (JNFL) mixed oxide fuel fabrication plant (J-MOX). The system consists of a 
He-based passive neutron well counter with an integrated high-purity germanium 
system. The AVIS is intended to meet a performance specification of a total measurement uncertainty of less than 0.5% in the neutron (
Pu effective) measurement. It is intended that the AVIS measurement will be substituted for a fraction of the DA samples from J-MOX. JAEA has conducted performance testing on the AVIS in order to confirm the system performance before installation and to minimize the period of calibration at J-MOX site. In this paper, we provide a summary of the result of performance test phase 1 and the test plan of performance test phase 2 of the AVIS.
Akiba, Mitsunori*
JNC TJ1420 2004-027, 165 Pages, 2005/03
JNC-TJ1420-2004-027.pdf:7.37MB
Nuclear material accountancy begins with the nuclear material accounting activities which are undertaken by facility operators. These activities and corresponding accounting information generated are verified through independent inspections. For bulk handling facilities, two diversion strategies, diversion into D and diversion into MUF, could be assumed. These diversion strategies have to be detected by inspectorate quantitatively. Inspection goals, that is, significant quantities, detection time and detection probability is set in advance. Based on the detction goal amounts, sample sizes are calculated for gross defect, partial defect and bias defects testers. Major defects could be detected by these three verificatuin testers, this is called Item-D statistics.Remaining of major defects which is small defects could be detected by Material Balance-D statistics. Diversion into MUF could be detcted by MUF statistics. Overall detection capabilities are the combination of these three statistics.
Nagatani, Taketeru; Nakajima, Shinji; Asano, Takashi; Kawasue, Akane*; Iso, Shoko*; Kumakura, Shinichi*; Watanabe, Takehito*; Marlow, J.*; Martyn, S.*; Menlove, H.*; et al.
no journal, ,
The AVIS (Advanced Verification for Inventory sample System), which was designed by LANL in partnership with Nuclear Material Control Center (NMCC), is a nondestructive assay (NDA) system to measure the plutonium mass for plutonium uranium mixed oxide (MOX) powder and pellet for large scale MOX fuel fabrication plant (J-MOX). The AVIS is intended to meet a performance specification of a total measurement uncertainty of less than 0.5% in the neutron (Pu effective) measurement. It is intended that the AVIS measurement will be substituted for a fraction of the DA samples to reduce the number of DA from J-MOX. Therefore, the AVIS has a crucial role to attain effective safeguards for J-MOX. JAEA, which has experience/knowledge to develop the NDA system and plutonium handling field, was entrusted with performance testing for the AVIS from NMCC. JAEA has conducted performance testing on the AVIS using standard radiation source (neutron and ). As the results of test, it was confirmed that the AVIS has the designed performance. As a next step, JAEA will conduct the AVIS test using MOX materials in order to evaluate the relevant measurement accuracy. This paper reports the performance test results and future MOX test plans of the AVIS.
