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; Sumino, Kozo; Yasu, Tetsunori; ; ; ; Terunuma, Seiichi
PNC TN9410 91-376, 79 Pages, 1991/11
None
Kotaka, Yoshinori; Michino, Masanobu; *; *; *; *; Terunuma, Seiichi*
PNC TN9410 89-129, 50 Pages, 1989/04
In order to reflect JOYO operational and maintainable experience to MONJU, JOYO operation section has to interchange technical information with MONJU. This report is used technical information interchanging meeting with MONJU regarding to primary sodium purification system and described that experiences of sodium reception, sodium initial purification and sodium purification during power increase.
*; *; *; *; *; *; *
PNC TN9410 89-084, 61 Pages, 1989/03
A cold trap examination for measurements of dose rate, which purpose is to grasp the distribution of Captured oxygen impurity from the surface dose rate and distribution of nuclide, was carried out in the 6th and the 7th periodic Annual Inspection. The results obtained from this examination were as follows. (1)The surface dose rate of a new modeling Cold Trap at the 7th periodic Annual Inspection was about twice rate as much as the 6th. (2)
Na, 
C0, 
Mn, and 
Sb were detected from C0ld Traps. (3)The distribution of Co at a old modeling Cold Trap was same as the distribution of captured oxygen of CT4-1B which is mocked up for a old modeling Cold Trap of JOYO. Therefore the distribution at a Cold Trap will be expected that the distribution of Co is same as the distribution of captured oxygen impurity. (4)The new modeling Cold Trap was designed to Capture the oxygen impurity homogeneity at mesh territory. The distribution of Co at the new modeling Cold Trap was uniformed at mesh territory. Therefore, if there are the Correlation between the distribution of Co and the captured oxygen impurity, New modeling Cold Trap was displaied design function and Captured oxygen impurity homogeneity.
Kotaka, Yoshinori; *; *; *; *; *; *
PNC TN9410 88-108, 121 Pages, 1988/03
This paper describes operational experiences of Joyo Secondary Sodium Purification System which were obtained from September 1979 in the middle of the first annual inspection and maintenance to March 1987 in the middle of the 6th annual inspection and maintenance. The test results were as follows. (1)The impurities in the secondary sodium cooling system were oxygen and Hydrogen. The impurity density corresponded to the plugging-temperature. (2)The cold trap control temperature was changed from 150
C to 130C on 16 May, 1982 in order to decrease corrosion due to the impurities in the secondary sodium cooling system. (3)The purification efficiency test of secondary cold trap was conducted on 26 through 29, December 1979. It was found that purification efficiency coefficient was 80%. While the test conducted, secondary cooling system was held at 200C constant. (4)Sodium charge in the secondary sodium purification system was conducted on 25 October 1980 and the secondary cold trap was started to be in use. In the secondary cold trap it was happened to be abnormal tendency, that is, the cold trap control temperature could not be abated to the set temperature, the heat exchange of economizer was not enough, and the mesh temperature changed. As a result of examination, the cause of the abnormal tendency was presumed that argon (Ar) gas space happened to exsist in sodium of secondary cold trap. The argon (Ar) gas space was supposed to be provided during the sodium drain in the secondary sodium purification system. Some recovery plant operation was proceeded ln order to reduce the argon (Ar) gas space out of the secondary cold trap. Thereafter, the secondary cold trap was operated without any trouble. (5)The number of cases of the secondary purification system trouble was 28. Among them, electrical troubles happened twelve times, mechanically oriented troubles happened sixteen times. Those troubles, however, did not affect to the ...
*; *; *; Kotaka, Yoshinori; *; *; *
PNC TN9410 88-045, 96 Pages, 1988/03
The Plugging Meter is used in JOYO Secondary Auxiliary Cooling System to monitor the sodium purity. This Plugging Meter have been operated more than 12 years since the coolant sodium was charged into JOYO Secondary Auxiliary Cooling System in 1975. Since its operation, some trouble conditions were observed and countermeasures have been taken. For these presume, the state of occurrence trouble conditions were investigated from 100MW 1st cycle operation to 100MW 14th cycle operation. The cause of some trouble conditions are as follows. (1)Increase of Plugging temperature during Reactor operation is supposed to be caused by unknown impurity precipitations except oxygen or hydrogen one. The unknown impurity is transfered from piping and component material in Secondary Auxiliary Cooling System after Reactor Power-up. (2)Sodium flow changes in Plugging Meter, like electric nois, are caused by gas into system sodium flow. (3)Sodium flow changes in Plugging Meter, in case that is not concerned with impurity precipitation, are caused by output voltage changes of the electromagnetic flow meter. This output voltage is shifted by sodium temperature changes. The researches and investigations of Plugging Meter in this system are continued to clear above and other specified matters, and take basically countermeasures.
Sekiguchi, Mineo*; *; *; *; *; *; *
PNC TN9410 87-124, 392 Pages, 1987/09
The fuel handling facility was set up in oct. 1974. The operational tests were done in three phases successively, first in air, then in argone gas and finally under sodium at 250C. Initial fuel loading for criticality of "Joyo" started in March 1977 and the criticality was achieved in April. After this, lower power test, power up test for 50 MW, 50 MW cycle operations, power up test for 75 MW, and 75 MW cycle operations followed till Dec. 1981. After the core conversion from the Breeding Core (MK-I Core) to the Irradiation Core (MK-II Core), 100 MW power achieved in March 1983 and the 100 MW cycle operation is going well now. In the meanwhile, the fuel handling facility transfered about 600 core assemblies and were checked five times as the regular inspection. This report reviews the experiences of operation and maintenance of the fuel handling facility from Jan. 1983 to Dec. 1985.
*; *; *; *; *; *; *
PNC TN941 83-27VOL2, 456 Pages, 1983/02
PNC-TN941-83-27VOL2.pdf:20.9MB
None
*; *; *; *; *; *; *
PNC TN941 83-27VOL1, 827 Pages, 1983/02
PNC-TN941-83-27VOL1.pdf:25.12MB
In the Experimental Fast Reactor "Joyo", Core Conversion from the Breeding Core (MK-I Core) to the Irradiation Core (MK-II Core) was begun in January 1982. Core Conversion required the refueling of 290 core elements, reconstruction of the control rod drive mechanism, and change-out of both the upper guide tube and lower guide tube of the control rods. The schedule for these activities was planned carefully to achieve 100MWt power in March 1983. Joyo achieved MK-II core initial criticality on November 22, 1982, on schedule and immediately began core characterzation. As the result of the Core Conversion activities, we handled many core elements, twice as many as before this core conversion, and in so doing obtained many kinds of experience and data for maintenance and operation of the refueling system. This report describes the considerable pre-conversion activities and planning, and the accomplishments and results of these Core Conversion activities.