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; *; *; Aoki, Tadao; *; *
PNC TN941 82-216, 62 Pages, 1982/09
This report describes the performance test of pony motor system mounted on the MONJU primary prototype pump. The test was conducted under various operation modes, and the following results were obtained: (1)The transition from the main motor to the pony motor was achieved very smoothly. (2)The transmission of the pony motor system worked well with its speed and torque kept constant. (3)start-up of a pump with a pony motor was accomplished very smoothly. (4)Apony motor current was about 63
65% of it rated operation. (5)A characteristics of pony motor system in high temperature atomosphere remained as same as that in the room temperature. (6)The amplitude of pony motor bearing vibration during operation was a little.
*; *; *; Aoki, Tadao; *; *
PNC TN941 82-178, 34 Pages, 1982/08
It was already confirmed that SID (Sodium lionization Detector) and DPD (Differential Pressure Detector) type sodium leak detectors for LMFBR "MONJU" had enough detection sensitivity. But an endurance test was required for putting them to practical use. Especially, life time of filament for the sodium aerosol ionization in the SID had to be examined. So, endurance performance of SID and DPD were investigated during about one year using an experimental equipment which simulates nitrogen atmosphere of reactor primary loop and sodium aerosal sampling tube. Results oftained in this test are as follows ; (1)SID filament did not break during one year operation, and little change of detection sensitivity was observed. (2)Neither performance deterioration nor measurement circuit trouble was experienced on the DPD.
*; *; *; Aoki, Tadao; *; *
PNC TN941 82-153, 44 Pages, 1982/07
Research and development of the Ultrasonic Flowmeter (USFM) for the large pipe sodium loop in the Prototype LMFBR "MONJU" have been conducted so far, and sodium flow measurement test using 12-inches USFM was already finished. But cold leg pipe of secondary loop of "MONJU" is 22B (primary loop; 24B), in which USFM is to be installed, so 24-inches USFM was made and some performance were measured in still sodium as the first step of some tests, and following results were obtained. (1)The ultrasonic pulse height enough for the operation of the USFM electronic circuit and long term stability was obtained in 200 550
C sodium temperature. (2)The electronic circuit parameters which could collect temperature dependency of USFM output within 
0.2% (200550C) were decided by the measurement of ultrasonic transmission time. (3)The zero point drift of USFM output was measured in the constant and transient sodium temperature, and the stability more than 0.2% (FS 6 m/s) was obtained. From these results, 24-inches USFM is found to have the possibility of utilization, so temperature collection accuracy of USFM Scale Factor and other performance must be confirmed by the sodium flow test for the application in "MONJU".
