JOPSS - Search Results

JAEA Reports

Measurement of hydrogen generating from radiolysis of highly active liquid waste and its quantitative evaluation

Yamamoto, Masahiko; Surugaya, Naoki; Mori, Eito; Taguchi, Shigeo; Sato, Soichi

JAEA-Research 2015-013, 27 Pages, 2015/10

JAEA-Research-2015-013.pdf:2.84MB

The H $_{2}$ concentration generating from Highly Active Liquid Waste (HALW) of Tokai Reprocessing Plant is measured in a closed experimental system. The experimental results show that H $_{2}$ concentration gradually increases at first and then approaches a steady-state due to the H $_{2}$ consumption reaction by Pd ions. The highest H $_{2}$ concentration is 1200 ppm (0.1%) when the solution temperature is at 23 $^{circ}$ C. It is found that H $_{2}$ generating from HALW is equilibrated one order of magnitude lower than the H $_{2}$ combustion lower limit. Moreover, a model based on H $_{2}$ generation from HALW by the radiolysis and H $_{2}$ consumption reaction by Pd ions is proposed and applied to evaluate H $_{2}$ concentration behavior in the gas phase. The calculated H $_{2}$ concentrations from proposed model agreed well with the experimental values. It is demonstrated that the behavior of H $_{2}$ generating from HALW can be evaluated quantitatively by applying the proposed model in this study.

JAEA Reports

The 4th technological meeting of Tokai Reprocessing Plant

; Maki, Akira; ; ; ; ; Fukuda, Kazuhito

JNC TN8410 2001-023, 188 Pages, 2001/11

JNC-TN8410-2001-023.pdf:30.98MB

"The 4th technological meeting of Tokai Reprocessing Plant (TRP)" was held in JNFL Rokkasyo site on octorber 11 $^{th}$ , 2001. The report contains the proceedings, transparancies and questionnaires of themeetin. This time, we reported about "Maintenance and repair results of Tokai Reprocessing Plant" based on technology and knowledge accumulated in Tokai Reprocessing Plant.

JAEA Reports

Long-term durability test of acid recovery evaporators made of Ti-5% Ta aIloy and zirconium

; Fujisaku, Kazuhiko*; *; ; Koyama, Tomozo

JNC TN8410 2001-013, 255 Pages, 2001/05

JNC-TN8410-2001-013.pdf:24.24MB

Mock-ups of acid recovery evaporators which are made of Ti-5% Ta alloy and Zr were tested under inactive condition for forty thousands hours to improve a corrosion resistance of acid recovery evaporator in Tokai reprocessing plant (TRP). The mock-up unit was designed and produced referring to the specification of acid recovery evaporator in TRP and the evaporation performance of the mock-up was 1/27 of TRP. A long-term durability of both evaporators was demonstrated by results of operation data, evaporation performance and corrosion resistance. The mock-up unit did not suffer from any trouble during the running test and the operation data such as temperature, flow, concentrations of nitric acid and metal ions were fairly stable within standard condition. As for the corrosion resistance, cracks and local corrosion such as intergranular attack were not observed on both evaporators after the running test, and a corrosion of weld was not selective. The average corrosion rates at measuring points were less than 0.1mm/yr, respectively, however, thickness of the Ti-5% Ta alloy evaporator was slightly reduced at all points of vapor phase region. In addition, from the result by test coupon, it is found that both materials have low susceptibility to stress corrosion cracking in this environment. The destructive inspection showed that the mechanical properties of both materials were not degraded during the running test. Finally, the total running time of the mock-up unit is much more than a maximum running time of acid recovery evaporator made of stainless steel in TRP (nearly 15,000 hours). On the basis of the test results, an excellent durability of Ti-5% Ta alloy and Zr evaporators under was successfully demonstrated throughout the mock-up test from an engineering perspective.

JAEA Reports

; Ihara, Hitoshi; Yamamoto, Yoichi; Ikawa, Koji

JAERI-M 89-171, 152 Pages, 1989/11

JAERI-M-89-171.pdf:4.1MB

no abstracts in English

Presentation/Publication Type

Journal/Book Title

Meeting title

First Author

Keyword

Language

Publication Year

Held year of conference

Measurement of hydrogen generating from radiolysis of highly active liquid waste and its quantitative evaluation

The 4th technological meeting of Tokai Reprocessing Plant

Long-term durability test of acid recovery evaporators made of Ti-5% Ta aIloy and zirconium

None

None

None

None

None

None

None

Development of a remote piping work system - advanced design - report of results

None

None

Reports of results of mock-up test concerning the remote piping work system

Reports of results of mock-up test concerning the remote piping work system

Real Time Item Accounting System(RIAS) of Spent Fuel at the Receiving and Storage Areas

Surveillance System Using the CCTV at the Fuel Transfer Pond R0108

The Operational Experience at Tokai Reprocessing Plant-Record of Oral Presentetion at RECOD'91-

An NRTA data processing system: PROMAC-J

Study of relationship between MUF correlation and detection sensitivity of statistical analysis