Refine your search:     
Report No.
 - 
Search Results: Records 1-9 displayed on this page of 9
  • 1

Presentation/Publication Type

Initialising ...

Refine

Journal/Book Title

Initialising ...

Meeting title

Initialising ...

First Author

Initialising ...

Keyword

Initialising ...

Language

Initialising ...

Publication Year

Initialising ...

Held year of conference

Initialising ...

Save select records

JAEA Reports

Neutron irradiation test of copper alloy/stainless steel joint materials

Yamada, Hirokazu; Kawamura, Hiroshi

JAEA-Technology 2005-001, 28 Pages, 2006/01

JAEA-Technology-2005-001.pdf:5.1MB

As a study about the joint technology of copper alloy and stainless steel for utilization as cooling piping in International Thermonuclear Experimental Reactor (ITER), Al$$_{2}$$O$$_{3}$$-dispersed strengthened copper or CuCrZr was joined to stainless steel by three kinds of joint methods (casting joint, brazing joint and friction welding method) for the evaluation of the neutron irradiation effect on joints. A neutron irradiation test was performed to three types of joints and each copper alloy. The average value of fast neutron fluence in this irradiation test was about 2$$times$$10$$^{24}$$n/m$$^{2}$$(E$$>$$1MeV), and the irradiation temperature was about 130$$^{circ}$$C. As post-irradiation examinations, tensile tests, hardness tests and observation of fracture surface after the tensile tests were performed. All type joints changed to be brittle by the neutron irradiation effect like each copper alloy material, and no particular neutron irradiation effect due to the effect of joint process was observed. On the casting and friction welding, hardness of copper alloy near the joint boundary changed to be lower than that of each copper alloy by the effect of joint procedure. However, tensile strength of joints was almost the same as that of each copper alloy before/after neutron irradiation. On the other hand, tensile strength of joints by brazing changed to be much lower than CuAl-25 base material by the effect of joint process before/after neutron irradiation. Results in this study showed that the friction welding method and the casting would be able to apply to the joint method of piping in ITER.

JAEA Reports

H$$^{-}$$ ion beam acceleration in a single gap multi-aperture accelerator

Watanabe, Kazuhiro; Takayanagi, Tomohiro; Okumura, Yoshikazu; Hanada, Masaya; Inoue, Takashi; Kashiwagi, Mieko; Morishita, Takatoshi; Taniguchi, Masaki

JAEA-Technology 2005-002, 19 Pages, 2006/01

JAEA-Technology-2005-002.pdf:2.34MB

no abstracts in English

JAEA Reports

Breeding blanket development; Tritium release from breeder

Tsuchiya, Kunihiko; Kawamura, Hiroshi; Nagao, Yoshiharu

JAEA-Technology 2005-003, 73 Pages, 2006/01

JAEA-Technology-2005-003.pdf:5.19MB

no abstracts in English

JAEA Reports

The Design of the radial collimator for residual stress analysis diffractometer at J-PARC

Torii, Shuki; Moriai, Atsushi

JAEA-Technology 2005-004, 31 Pages, 2006/02

JAEA-Technology-2005-004.pdf:13.06MB

no abstracts in English

JAEA Reports

Study on a conceptual design of a data acquisition and instrument control system for experimental suites at Materials and Life Science Facility(MLF) of J-PARC

Nakajima, Kenji; Nakatani, Takeshi; Torii, Shuki; Higemoto, Wataru; Otomo, Toshiya*

JAEA-Technology 2005-005, 44 Pages, 2006/02

JAEA-Technology-2005-005.pdf:3.17MB

no abstracts in English

JAEA Reports

Evaluation of heat exchange performance for primary pressurized water cooler in HTTR

Tochio, Daisuke; Nakagawa, Shigeaki

JAEA-Technology 2005-006, 116 Pages, 2006/01

JAEA-Technology-2005-006.pdf:7.08MB

In High Temperature Engineering Test Reactor (HTTR), the rated thermal power of 30MW, the generated heat at reactor core is finally dissipated at the air-cooler by way of the heat exchangers of the primary cooling system, such as the primary pressurized water cooler (PPWC) and the intermediate heat exchanger (IHX). The heat exchangers in the primary cooling system are required the heat exchange performance to remove reactor generated heat 30MW under the condition of reactor coolant outlet temperature 850$$^{circ}$$C/950$$^{circ}$$C. Therefore, the heat exchanges are required to satisfy the design criteria of heat exchange performance. In this report, heat exchange performance data of the rise-to-power-up test and the in-service operation for the PPWC in the main cooling system was evaluated. Moreover, the evaluated values were compared with the design values, and it is confirmed that PPWC has the required heat exchange performance in the design.

JAEA Reports

Evaluation of effect of inlet distortion on aerodynamic performance of helium gas compressor for Gas Turbine High Temperature Reactor (GTHTR300) (Contract research)

Takada, Shoji; Takizuka, Takakazu; Yan, X.; Kurokochi, Naohiro; Kunitomi, Kazuhiko

JAEA-Technology 2005-007, 241 Pages, 2006/02

JAEA-Technology-2005-007.pdf:48.98MB

Because the main pipe is connected perpendicular to the flow direction inside the distributing header in the inlet casing of the helium gas compressor design of GTHTR300, the main flow flowing into the header tends to separate from the header wall and to cause reverse flow, which increases flow resistance in the header. This phenomenon increases the total pressure loss in the header and inlet distortion, which is considered to deteriorate the aerodynamic performance of the compressor. Tests were carried out to evaluate the effects of inlet distortion on aerodynamic performance of compressor by using a 1/3-scale helium gas compressor model by varying a level of inlet distortion. Flow was injected from the wall of header to adjust circumferential velocities uniform before and after the inverse flow region to dissipate the separation and inverse flow. At the rated flow point, inlet distortion was reduced 2-3 % by injection, which resulted in increasing adiabatic efficiency of blade section around 0.5 %. At the same time, pressure loss of the inlet casing was reduced around 3-5%, which is equivalent to adiabatic efficiency improvement around 0.8%. Surge flow rate was lowered from 10.0 kg/s to 9.6 kg/s. By setting orifice at the inlet of inlet casing and increasing inlet distortion 4% higher, the adiabatic efficiency of blade section became 1 % higher. A new correlation between inlet distortion and adiabatic efficiency of blade section at the rated flow rate was derived based on compressor-in-parallel model and fitted to the test results. Overall adiabatic efficiency of full scale compressor was predicted 90.2% based on the test results of efficiency and Reynolds number correlation, which was close to 89.7% that was predicted by test calibrated design and CFD codes, which satisfied the design value 89.0 % of the compressor for GTHTR300.

JAEA Reports

Burnup characteristics of burnable poison and core characteristics of HTTR

Fujimoto, Nozomu; Nojiri, Naoki

JAEA-Technology 2005-008, 45 Pages, 2006/01

JAEA-Technology-2005-008.pdf:1.9MB

The HTTR uses burnable poison to compensate the change in reactivity with burnup. The burnable poison is a rod type and the change in effective absorption cross section become large due to its shape. Therefore, change in effective cross section of burnable poison due to burnup, temperature, fuel enrichment, etc. are evaluated and the core calculation model for burnup calculation. Using the model, burnup calculations are carried out and compared with results of experiments and other code. It become clear that the model shows reasonable results.

JAEA Reports

Development of new $$alpha$$-ray measurement methods with radon suppression focused on pulse time interval

Sanada, Yukihisa; Nohara, Naofumi*; Adachi, Yasuyuki*; Nemoto, Kazuhiko*; Kawai, Keiichi*; Kobayashi, Hirohide; Hashimoto, Tetsuo*

JAEA-Technology 2005-009, 33 Pages, 2006/01

JAEA-Technology-2005-009.pdf:1.42MB

An $$alpha$$-ray measurement methods based on analyzing the time interval of pulses was newly developed. This method was developed aiming to suppress the background counts originated in progeny of uranium series. A delayed coincidence and time interval analysis (TIA) methods have been applied to measure a-b decay successive events (correlated events) on microsecond time-scale (164$$mu$$s). The measurement system have such functions with silicon detectors was developed intending to shorten the dead time. The basic performance of the system was examined by using $$^{230}$$Th electrodeposited sources. Follows were obtained in this work : The theory of measurement $$^{214}$$Po using TIA methods was established. Measurement system of $$^{214}$$Po was developed. Conformation methods of correlated events by using $$^{230}$$Th electrodeposited sources was suggested. The efficiency of correlated events in aerosol samples was estimated. The methods to measure correlated events was indicated by addition of $$^{230}$$Th. The method of subtracting the progenies of the thorium series are to examine.

9 (Records 1-9 displayed on this page)
  • 1