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; Kawai, Masashi; ; ; ; Okubo, Toshiyuki;
PNC TN9410 94-094, 69 Pages, 1994/03
As the final step of development of a control rod guide system (rod guider), it has been conducted to display information concerning the rod guider operation and the current plant conditions on a CRT in Japanese, to tell information for operators and to predict more accurately the stroke of each control rod to be driven at a reactor power adjustment operation since 1992, in oder to improve a function of man-machine interface of the rod guider. The development of the rod guider was completed with the following good results as expected. (1)The function of man-machine interface of the rod guider was improved to display information on a CRT in Japanese. (2)The voice guidance contributed to obtain higher operational reliability and to lower the load on the operators. (3)The rod guider provided the same function as operation manuals of Joyo because all operation procedures in the manuals were inputted into the rod guider. And the timely operation guides provided by the rod guider evabled non-skilled operators to control the reactor in the same manner as the experienced ones. (4)The difference of the predicted and actual rod stroke to be driven at the reactor power adjustment operation was reduced to less than 
0.2mm by both the existing inverse multiplication method and the experiences gained in the past five reactor power adjustment operations.
Karube, Koji; ; ; ; Kawai, Masashi;
PNC TN9440 93-012, 83 Pages, 1993/04
This report describes the operating experience of the primary main cooling system from January 1982 to March 1992, and of the primary auxiliary cooling system from october 1986 to March 1992. 0ut lines of the operating experience ale followings; There have been no serious troubles in this period. (1)The main system; Operation time of the circulation pumps are about 67675 hours. Accumulated operation time of the pumps are about 105970 hours. The pumps has been started 212 times. (2)The auxiliary system; Operation time of the circulation pump (EMP) is about 4767 hours. Accumulated operation time of the pump is about 8667 hours. The pump has been automatically started 31 times with the scheduled test.
Maruyama, Akira; Nomura, Shigeo; Kawai, Masashi; Takani, Satoru; Ota, Yoshio; Atsumo, Hideo
Nihon Genshiryoku Gakkai-Shi, 26(4), p.327 - 338, 1984/04
Times Cited Count：5 Percentile：51.26(Nuclear Science & Technology)None
Kano, Shigeki; Maruyama, Akira*; *; *; Kawai, Masashi; Namekawa, Masaru; Nakasuji, Takashi
PNC TN941 77-90, 102 Pages, 1977/01
A series of tests have been conducted in relation to experimental estimation of corrosion behavior of AlSI Type-316 fuel cladding tube in high temperature flowing sodium. A present study relates to establish the difference of corrosion behavior between qualities of fuel cladding tubes. A kind of the second fabrication tube for JOYO (S-II) and two kinds of tubes used for JOYO MK-I core S-III and K-III) have been exposed to 650
C sodium at a flow velocity of 3 m/sec for 5000 hrs. Also, corrosion data up to date at the Sodium Technology Section have been arranged by test variables to obtain basic information for design criterion relating to sodium corrosion of domestic fuel cladding tubes. The results obtained are as follows: (1)Corrosion behavior in sodium depended on qualities of fuel cladding tubes. The S-III tube showed the greatest corrosion rate among fuel cladding tubes tested. (2)Alpha phase, sigma phase and carbide disappearance layer were observed in the surface vicinity of sodium contact. However, sigma phase existed in bulk thickness of the S-III tube. (3)Carbon and nitrogen transferred to sodium from all fuel cladding tubes, but boron didn't. Denitrization content depended on initial nitrogen content in the tube. Decarburization content was nearly constant and didn't depend on initial carbon content in the tube. (4)It was clarified that corrosion data obtained at the Sodium Technology Section stood comparison with foreign data. A rate of thickness change was 3.5 
m/year (max. variation: 25%) at JOYO design conditions (sodium temperature: 650C, cold trap temperature: 150C, Reynolds number: 55,000 and L/D: zero). (5)A literature survey showed that active carbon content in sodium was 0.1 ppm through 0.2 ppm, which was one of rate controlling factors in carbon transfer.
Kano, Shigeki; *; *; Kawai, Masashi; *; Koakutsu, Toru; Atsumo, Hideo
PNC TN952 71-02, 271 Pages, 1971/10
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