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JAEA Reports

Fuel Failure Simulation Test in JOYO; FFDL in-pile test(III)

Ito, Chikara; Ito, Hideaki; Ishida, Koichi; Hatoori, Kazuhiro; Oyama, Kazuhiro; Sukegawa, Kazuya*; Murakami, Takanori; Kaito, Yasuaki; Nishino, Kazunari; Aoyama, Takafumi; et al.

JNC TN9410 2005-003, 165 Pages, 2005/03


At experimental fast reactor JOYO, appraisal of detection efficiency of behavior and FFD and FFDL of the fission product which is discharged inside the furnace as one of safety research of the country, is carried out. In MK-II core, the slit in the gas plenum part of the test sub-assembly, the test which irradiates this(1985 April, FFDL in-pile test(I)), providing the slit in the fuel column part of the test sub-assembly, the test which it irradiates(1992 November, FFDL in-pile test(II)) were carried out.MK-III reactor core replacement was completed and started in 2004. That the behavior in the system of FP with the reactor core replacement and so on changes in the MK-III reactor core and to have an influence on the sensitivity and the replying of FFD and FFDL are thought of. Therefore, behavior of FP in the fuel failure in the MK-III reactor core, the performance of FFD and FFDL must be confirmed beforehand. Moreover, to prepare for the fuel failure and the RTCB test which is doing a future plan, and to confirm a plant operation procedure in the fuel failure in MK-III reactor core operation and to attempt for the correspondency to improve are important.Therefore, in the period from 2004 November 11th to November 29th, it carried out the FFDL in-pile(III). It did a series of plant operation to stop a nuclear reactor after loading a reactor core center with the fuel element for the test which provided an artificial slit for the fuel cladding in the MK-III reactor core and irradiating it and detecting fuel damaging and to take out fuel. And it confirmed the operation procedure of the fast reactor in the fuel failure.Also, the improvement items such as the improvement of the operation and the procedure and the remodeling and the service of the facilities could be picked up. In the future, it attempts these compatible, and it prepares for the MK-III reactor core operation and it incorporates a final examination result by the improvement of the safety of FBR.

JAEA Reports

Periodic safety review of the experimental fast reactor JOYO; Review of the activity for safety

Maeda, Yukimoto; Kashimura, Yoichi; Suzuki, Toshiaki; Isozaki, Kazunori; Hoshiba, Hideaki; Kitamura, Ryoichi; Nakano, Tomoyuki; Takamatsu, Misao; Sekine, Takashi

JNC TN9440 2005-001, 540 Pages, 2005/02


Periodic safety review (Review of the activity for safety) which consisted of "Comprehensive evaluation of operation experience" and "Incorporation of the latest technical knowledge" was carried out up to January 2005.

JAEA Reports

Report of tests for radiation control executed in the JOYO MK-III performance tests

Hoshiba, Hideaki; Hashimoto, Makoto; Irokawa, H.; Usui, Toshihide; Sato, Hayato; Emori, Shuichi

JNC TN9410 2004-017, 170 Pages, 2004/08


While the JOYO MK-III Project, after the modification of primary coolant system started in oct.2000 and the integrated function tests, from Jun.2003, the performance test was executed for the purpose of verification of designed performance and confirmation of basic characteristics as an irradiation reactor. While the JOYO MK-III performance test, 28 tests were executed. Radiation control section took charge of 3 of them, "Dose Rate Distribution", "Radiation Control" and "Gaseous Waste Radioactive Concentration Measurement". The performance tests in charge of radiation control section was started on Jun.27, 2003, that is before the start-up of reactor, and were carried out when the thermal output of reactor was 40MWt, 70MWt, 105MWt and effective full power, 140MWt. The pre-operation tests in charge of radiation control section are "Test of dose rate measurement in operation and after shutdown". "Test of radioactive concentration measurement of air", and "Test of gaseous waste processing performance". The final test was "Test of dose rate measurement after shutdown", which was executed on Nov.27 2003. JOYO passed the inspection and the performance test was finished. The representative results in these performance tests are; 1.Every result is under the criterion 2.Dose rate and monitoring data are totally less than the data in MK-II operation. Though it confirmed that all the data are under the criterion, it is considered that these tests should be performed at proper intervals because the circumstances may change.

JAEA Reports

Report of Radiation Exposure Control on the 13th Annual Inspection at the Experimental Fast Reactor JOYO

Kano, Yutaka; Hoshiba, Hideaki; Emori, Shuichi; T.Higuchi

JNC TN9410 2004-012, 51 Pages, 2004/03


The 13th annual inspection at the experimental fast reactor JOYO had been executed from June 1, 2000 to November 27,2003.While this inspection,in addition to the regular maintenance and repair, some countermeasure works based on safety overhaul and works relevant to the heat transport system modification for upgrading the irradiation performance (MK-III modfication) in the under floor of reactor building were implemented. Duration of the inspection was about 3.5 years, longer than past inspections. While the inspection, the replacement of the internal heat exchanger (IHX) A,B, in primary coolant system, and relevant pipes was considered important in radiation control. The point of radiation control of this work was external exposure to workers.The expectation of exposure dose in the annual inspection and the MK-III modification were made for every work subject in consideration of procedure, number of workers, period and place of the work. The expectation of total exposure in the annual inspection, summed up the yearly expectation from 2000 to 2003 , was 1156 man-mSv. While In the MK-III modification from June 1, 2000 to November 30, 2002 , the expectation of total exposure was 7135 man-mSv. Furthermore, all the while in the MK-III modification, We call for work end department that workers exposure was as low as practical. As a result, total exposure was 633 man-mSv in the annual inspection, and 2386 man-mSv in the MK-III modification. Both of total result exposure was about 30-50 % of the expectation, and every worker's exposure were controlled under the criteria of exposure control. Finally, the works in the 13th annuall inspection was properly executed.

JAEA Reports

Summary Report of the Experimental Fast Reactor JOYO MK-III Performance Test

Maeda, Yukimoto; Aoyama, Takafumi; Yoshida, Akihiro; Sekine, Takashi; Ariyoshi, Masahiko; Ito, Chikara; Masaaki, Nemoto; Murakami, Takanori; Isozaki, Kazunori; Hoshiba, Hideaki; et al.

JNC TN9410 2003-011, 197 Pages, 2004/03


MK-III performance tests began in June 2003 to fully characterize the upgraded core and heat transfer system. Then, the last pre-use inspection was finished in November 2003.This report summarize the result of each performance test.

JAEA Reports

Radiation control report on intermediate heat exchanger replacement and related works

Kano, Yutaka; ; ; *; Hoshiba, Hideaki; ; Shindo, Katsutoshi

JNC TN9410 2002-009, 127 Pages, 2002/03


The 13th periodical inspection of the experimental fast reactor JOYO is being made from Jun. 2000 to Jan. 2003. While this inspection, from the end of oct. 2000 to Nov. 2001, the MK-III modification work on heat transport system was made in lower region of the reactor containment vessel in the reactor facility (under floor area). In the MK-III modification work, the works important to radiation control were the replacement of intermediate heat exchangers (IHxs) and fixtures, and the picking out of the surveillance material from primary heat transport piping carried out in the maintenance building. Because the working areas of these works were executed in small space around the complicated primary heat transport piping, workability was bad and dose rate from the corrosion products (CP) in piping or fixtures was high. In such condition, radiation control was performed mainly concerned about external exposure. The planned total external exposure of the IHX replacement and related works was 7135 man$$times$$mSv (target of total dose control: less than 5708 man$$times$$mSv, 80% of the plan), derived from special radiation work plans for segmental works, concerned about work procedure, number of workers, period of work, dose rate of working area and surface dose rate of equipments. The special radiation control organization was established for such long and large-scale work. The special organization held detailed discussion about radiation control of this work with the execution section and contractors appropriately, performed carefal external/internal exposure control and surface contamination control and made effects to reduce the external exposure thoroughly. As a result of these action, the total external exposure was 2386 man$$times$$mSv ( $$simeq$$33% of the plan, $$simeq$$42% of the target) and the maximum individual exposure were 24.7 mSv for staffs and 21.7 mSv for contractors. The dose rate, surface contamination and air contamination while the works were ...

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