講演番号をこちらに

04aD10P
IFMIF/EVEDAリチウム試験ループにおける実証試験の進捗
1) 運転性能に関する各種実証試験
Progress of Activities in the IFMIF/EVEDA Lithium Test Loop
1) EVEDA Li Test Loop Operational Test
近藤浩夫、金村卓治、古川智弘、平川康、若井栄一
Hiroo Kondo, Takuji Kanemura, Tomohiro Furukawa, Yasushi Hirakawa Eiichi Wakai（独）日本原子力研究開発機構
Japan Atomic Energy Agency
1. Introduction
Engineering Validation and Engineering Design Activities(EVEDA) for the International Fusion Materials Irradiation
Facility (IFMIF) have been carried out under the “BroaderApproach” (BA) agreement. As a major activity by theJapanese for the Li target facility, the EVEDA Li test loop(ELTL) was constructed at the Japan Atomic Energy
Agency's Oarai site to validate the hydraulic conditions ofthe IFMIF Li target. This paper presents the first operational
results of the Li target in the ELTL. A series of tests were
performed to check the operational performance of the Litarget.
Validations of the performance of the ELTL, the Li target,
and the purification system are specified in the first phase of
the validation (the phase 1 validation) from the beginning.
Finally in this phase, we have established a significant
achievement that was observation of the Li target at thedesign nominal velocity (15 m/s) under a vacuum condition.
In this presentation, we focus on tests on observation of theLi target using a normal camera up to the maximum velocity.

located 196.97 mm downstream from the nozzle outlet in thecurrent configuration. The area within 30 mm from each sidewall is the margin within which the side wall effect should
be avoided. The surface wake originated from the corner ofthe nozzle was initially pointed out as a major factor to
disturb the thickness uniformity. Through observation, theside wall margin of 30 mm was sufficient to avoid thesurface wake from each side wall. Therefore, the thicknessof the Li target was almost flat except for the small surface
wakes caused from the center of the nozzle. The contributionof these surfaces wakes to the thickness uniformity wasconfirmed by a laser distance meter, and therefore, thenon-uniformity was confirmed to be within 1 mm. This
result will be reported in the near future.

2. Experimental facility and condition

The ELTL, whose Li inventory is 5.0 m3 and platform sizeis roughly 20 × 20 × 20 m (See our previous report [1] formore details), can produce the Li target at a maximum
velocity of 20 m/s under a vacuum condition of around 10-3
Pa. The Li target is formed in a component called as thetarget assembly which consists of a flow straightener, adouble reducer nozzle, and a back plate. Li flows into thedouble reducer nozzle, and is formed as the Li target whose
velocity, thickness, and width are 20 m/s (maximum), 25mm, and 100 mm, respectively along the concave back plate.
The Li target is to be observed and measured in detailthrough a viewing port.
In this study, the flow rate is measured by anelectro-magnetic flow meter (EMF). The pressure ismeasured by a pressure gauge for tests under pressurized
conditions and by a vacuum gauge under vacuum conditions.
The appearance of the Li target was monitored and recorded
by a digital camera (D800 with AS Nikkor 28-300 mm,Nikkon).
The pressure conditions were two cases—pressurized (117,120 kPa) and vacuum conditions (373, 550 Pa)—and thetemperature was set at 300 °C.

3. Results and discussion
Fig. 1 shows photographs of the Li target under thevacuum (373 Pa) condition. The exposure time in all
photographs was 2 s to characterize the time-averaged shapeof the Li target.
The center of the beam footprint planned in the IFMIF isFig. 1 Li target flow appearance under vacuum condition
Pressure: 373 Pa, Velocity: 15 m/s (left) and 20 m/s (right)

4. Conclusion
In the phase 1 validation of the ELTL, a series of tests
on the Li target were initially performed. The tests aimedat establishing the Li target start-up process andpreliminary observation of the Li target flow up to themaximum design velocity (20 m/s). As a result, we havesuccessfully established the stable Li target, and thethickness and surface fluctuation of the Li target can beclarified by diagnostics such as a laser thickness meterand a high-speed video camera in the later phase.

References[1]

H. Kondo et al., “IFMIF/EVEDA Lithium Test Loop: Designand Fabrication Technology of Target Assembly as a KeyComponent”, Nucl. Fusion 51 (2011) 123008