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Nakamura, Hironobu; Beddingfield, D. H.*; Nakamichi, Hideo; Kurita, Tsutomu
Proceedings of INMM 51st Annual Meeting (CD-ROM), 9 Pages, 2010/07
The Distributed Source-Term Analysis (DSTA) technique has been used in a variety of safeguards applications to determine the location and quantity of material contained within large sample volumes. The DSTA method can provide the user with knowledge of the location of neutron-producing materials and the magnitude of the localized activity. A facility operator can use this information to identify the physical location of holdup during cleanout activities. In this paper, we present the concept of using the DSTA method as a 
(BCAT) that is used by operator during cleanout activities to increase recovered material and reduce facility MUF. In addition to the above effects, this BCAT concept provides that operator radiation-exposure and unmeasured inventory can be also reduced. We also present the actual powder recovering result performed in PCDF and comparison result between recovered material amount and calculated amount by BCAT.
Mukai, Yasunobu; Nakamura, Hironobu; Hosoma, Takashi; Yoshimoto, Katsunobu; Tamura, Takayuki*; Iwamoto, Tomonori*
Proceedings of INMM 51st Annual Meeting (CD-ROM), 9 Pages, 2010/07
JNFL and JAEA are collaboratively developing an advanced solution monitoring and measurement system (ASMS) for Rokkasho Reprocessing Plant (RRP). In this study, as a second trial, we designed and fabricated a new demonstration-type detector for ASMS, then installed it to another process tank in PCDF. Using two detectors, tests for process monitoring capability were performed for several operational conditions such as sampling, bubbling, circulation, solution transfer between two tanks, followed by studies in sensitivity of monitoring and studies in stability for the duration of storage. As a result, excellent performances and advantages of ASMS compared with conventional SMMS were confirmed. It is concluded that ASMS can provide very useful information of operation status and Pu amount shared between operator and inspector. It is sure that the combination of current SMMS and the ASMS is very powerful tool to improve transparency in the future safeguards design.
Nakamura, Hironobu; Beddingfield, D. H.*; Nakamichi, Hideo; Kurita, Tsutomu
Proceedings of INMM 51st Annual Meeting (CD-ROM), 9 Pages, 2010/07
The Distributed Source-Term Analysis (DSTA) technique has been used in a variety of safeguards applications to determine location and quantity of material contained within large sample volumes. It can provide user with knowledge of the location of neutron-producing materials and magnitude of the localized activity. Operator can use this information to identify the physical location of holdup during cleanout operations. In this paper, we present the concept of using the DSTA method as a (BCAT) that is used by operator during cleanout to increase recovered material, to decrease unmeasured inventory, and to perform the cleanout activity effectively in order to reduce operator radiation-exposure. We confirmed good consistency between the difference of neutron activity before and after cleanout calculated by BCAT and neutron activity of actual recovered material.
-rays in material accountancy and safeguards verification for future nuclear fuel cycle facilitiesSeya, Michio; Hajima, Ryoichi; Nishimori, Nobuyuki; Kikuzawa, Nobuhiro; Hayakawa, Takehito; Shizuma, Toshiyuki; Fujiwara, Mamoru
Proceedings of INMM 51st Annual Meeting (CD-ROM), 10 Pages, 2010/07
This article introduces possibilities of various applications of ERL (Energy Recovery Linac) based laser Compton scattering (LCS) X- and -ray sources to nondestructive assay (NDA) in material accountancy and safeguards verification for future nuclear fuel cycle (FNFC) facilities. The NDA system using 1-3 MeV LCS -ray source (350 MeV electrons + laser) with having semi-monochromatic energy distribution and enough intensity could be applied to measurement of Pu not only in spent nuclear fuel but also in fresh MOX fuel with FPs (fission products) and MAs (minor actinides) by NRF (nuclear resonance fluorescence) method. This NDA system is as well applicable for measuring Pu in hulls or vitrified waste. The NDA system using 100-150 keV LCS X-ray source (85 MeV electrons + laser) could be applied to measurement of concentrations of U, Pu, MAs in solutions with higher speed than the present Hybrid K-edge/XRF densitometer.
Hayakawa, Takehito; Shizuma, Toshiyuki; Hajima, Ryoichi; Kikuzawa, Nobuhiro; Nishimori, Nobuyuki; Seya, Michio; Fujiwara, Mamoru
Proceedings of INMM 51st Annual Meeting (CD-ROM), 10 Pages, 2010/07
We propose a new nondestructive assay method for 
U, 
Pu, and minor actinides in spent nuclear fuel assembly in a water pool. Nuclear fuel materials are detected using nuclear resonance fluorescence (NRF) with laser Compton scattering (LCS) -rays, which are generated by collision of high energy electrons and laser photons. This method can identify each isotope of interest hidden in heavy shields such as lead plates with a thickness of several centimeters. A simulation calculation shows that we can detect 1% fraction Pu in all the fuel rods with statistical error lower than 2% using the proposed high flux LCS -ray source in the measurement time of 4000s.
Sumi, Mika; Abe, Katsuo; Kageyama, Tomio; Nakazawa, Hiroaki; Kurosawa, Akira; Yamamoto, Masahiko; Mason, P.*; Neuhoff, J.*; Doubek, N.*; Balsley, S.*; et al.
Proceedings of INMM 51st Annual Meeting (CD-ROM), 9 Pages, 2010/07
Large Size Dried (LSD) spikes are currently used in many facilities in Japan (and around the world) for U and Pu accountancy analysis by Isotope Dilution Mass Spectrometry (IDMS). Because of the large quantity of plutonium standard materials are needed to support Japanese facilities for nuclear fuel cycle and expected difficulties in the long term supply and transport of Pu reference materials, JAEA decided to evaluate the possibility of using MOX stored at Plutonium Fuel Development Center (PFDC) as a source of Pu standard material for LSD spike preparation. At PFDC, Pu nitrate solution was prepared from MOX and two types of the LSD spikes were prepared. The samples of each spike were distributed for verification measurements to international and domestic laboratories. Details of the Pu make-up value evaluation, the LSD spike preparation and the evaluation of the verification results will be presented.
Inoue, Naoko; Kaji, Naoya; Suda, Kazunori; Kawakubo, Yoko; Suzuki, Mitsutoshi; Koyama, Tomozo; Kuno, Yusuke; Senzaki, Masao
Proceedings of INMM 51st Annual Meeting (CD-ROM), 10 Pages, 2010/07