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JAEA Reports

Development of Cladding Material Creep Rupture Detection System Using Laser Resonance Ionization Mass Spectrometry for the Fast Reactor

Ito, Chikara; Nose, Shoichi; Harano, Hideki; Arima, Toshihiro*

JNC TN9400 2004-007, 44 Pages, 2004/01


In the experimental fast reactor JOYO, an on-line instrumented material irradiation rig developed to acquire various irradiation data. The Material Testing Rig Temperature Control (MARICO) is capable of collecting creep rupture strength data for fast reactor fuel cladding materials. The irradiation using MARICO rig began in 1994 with JOYO's 29th operational cycle and ended in 1998 with the 32nd cycle. A ruptured sample might not be able to be specified with a device of MARICO in the irradiation examination. To improve irradiation technology, the trace rare gas detection technique using laser resonance ionization mass spectrometry (RIMS) is applied to creep rupture experiment. The irradiation capsules are labeled with tagging gases. The identification uses isotope analysis of the tagging gas leaked out of the breached steel capsule, diffused in the argon cover gas. The RIMS device analyzed the isotopic composition of the cover gas of which it took a sample. As that result, the isotopic composition that it was measured with a RIMS device corresponded with the tag gas identified by the MARICO device.

JAEA Reports

Development of argon cover gas analysis for fast reactors using atmospheric pressure ionization mass spectrometry with collision-indued dissociation

; Ito, Chikara; Arima, Toshihiro*; Yamaguchi, Katsuyuki*

JNC TN9400 2003-009, 25 Pages, 2003/03


The isotopic measurement of krypton in argon is partially obstructed by the isobaric interference in the fast reactor cover gas analysis that is performed using atmospheric pressure ionization mass spectrometry. Collision-induced dissociation is applied to decompose cluster ions and suppress the interference. Cluster ions are accelerated by an electric field in a relatively high-pressure region and are dissociated through multiple collisions with neutral particles. This process is controlled by changing the accelerating voltage in the present study. It is shown that the isobaric interference due to argon dimer ions are suppressed by increasing the accelerating voltage. The isobaric interference could be reduced to 1/60,000 in the most effective condition. It is also found that collision-induced dissociation enhances the detection sensitivity and permits quantitative analysis with a sub-ppt level for the krypton nuclides that are not interfered.

JAEA Reports

Application of trace rare gas detection Technique using laser to JOYO

Harano, Hideki; Ito, Chikara; Arima, Toshihiro*; *

JNC TN9400 2002-003, 54 Pages, 2002/03


An early detection of fuel failure and subsequent precise identification of the failed fuel subassemblies are important and indispensable for operating fast reactors from the viewpoint of their safety, reliability and plant availability as well. In order to improve the failed fuel detection and location (FFDL) technology, the laser resonance ionization spectrometry (RIMS) has been proposed to use for the trace nalysis of krypton and xenon contained in cover gas. Various promising features have been reported through the fundamental study using the RIMS device at the nuclear engineering research laboratory (NERL) of the university of Tokyo. The results suggest the feasibility of this method to on-power real-time monitoring. Based on the information obtained above, we are developing a new laser FFDL system which employs RIMS, and it is applied to the fast experimental reactor JOY0. By using this system at JOY0, the isotope analysis can be performed with high sensitivity not only for radioactive nuclides but also for stable elements of fission product (FP) and tag gas which are usually diluted in the cover gas argon. This enables to improve irradiation technology and to identify the failed fuel subassemblies immediately. For instance, it becomes possible to identify breached steel capsule to be used for on-line creep rupture experiment of cladding materials under the irradiation condition. The fuel burn-up of failed subassembly can be estimated by measuring the isotopic composition of FP nuclides, which allows the pre-location in the FFDL procedure. The present paper describes the basic design of the laser FFDL system. Some experimental results are also reported from the performance tests to examine the feasibility to fast reactor cover gas analysis.

JAEA Reports

JOYO impurity concentrations of radioactive nuclide data in the primary system (MK-II core)

; Saikawa, Takuya*; Masui, Tomohiko*; Arima, Toshihiro*

JNC TN9410 2001-014, 26 Pages, 2001/03


The experimental fast reactor "JOYO" served as the MK-II irradiation test bed core for testing fuel and material for FBR development for 18 years from 1982 to 2000. "JOYO" has no fuel failure since the initial criticality. Impurity concentrations of fission products data were accumulated in the primary argon gas and primary sodium during the MK-II core operation in order to obtain background value. 352 samples of primaly argon gas and the online gamma-ray monitor determined the fission products concentration data in the primary argon gas. In order to demonstrate the performance of the cold trap pre-filter, the cold trap pre-filter function confirmation tests were carried out in 1995 during 10$$^{th}$$ annual inspection. The $$^{137}$$Cs concentration data in the primary sodium were determined by 10 samples of primary sodium. The in core tag gas release tests were carried out during 29th cycle to 31st cycle. The online gamma-ray monitor determined the activation tag gas concentration data in the primary argon gas These fission products concentration data, the cold trap pre-filter function confirmation tests data and in core tag gas release tests data were compiled, which were recorded on CD-ROM for user convenience.

Oral presentation

Failed fuel detection and location in a fast reactor by fission product gas analysis with laser resonance ionization mass spectrometry

Ito, Chikara; Hattori, Kazuhiro; Aoyama, Takafumi; Arima, Toshihiro*

no journal, , 

no abstracts in English

Oral presentation

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