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JAEA Reports

Maintenance of helium sampling system in HTTR

Sekita, Kenji; Emori, Koichi; Kuroha, Misao; Kimishima, Satoru; Wakabayashi, Hiroshi

JAEA-Testing 2006-001, 49 Pages, 2006/06

JAEA-Testing-2006-001.pdf:6.24MB

no abstracts in English

JAEA Reports

Leakage rate test for reactor containment vessel of HTTR

Kondo, Masaaki; Sekita, Kenji; Emori, Koichi; Sakaba, Nariaki; Kimishima, Satoru; Kuroha, Misao; Noji, Kiyoshi; Aono, Tetsuya; Hayakawa, Masato

JAEA-Testing 2006-002, 55 Pages, 2006/07

JAEA-Testing-2006-002.pdf:6.36MB

The leakage rate test for the reactor containment vessel of HTTR is conducted in accordance with the absolute pressure method provided in Japan Electric Association Code(JEAC4203). Although leakage test of a reactor containment vessel is, in general, performed in condition of reactor coolant pressure boundary to be opened in order to simulate an accident, the peculiar test method to HTTR which use the helium gas as reactor coolant has been established, in which the pressure boundary is closed to avoid the release of fission products into the environment of the reactor containment vessel. The system for measuring and calculating the data for evaluating the leakage rate for containment vessel of HTTR was developed followed by any modifications. Recently, the system has been improved for more accurate and reliable one with any useful functions including real time monitoring any conditions related to the test. In addition, the configuration of containment vessel boundary for the test and the calibration method for the detectors for measuring temperature in containment vessel have been modified by reflecting the revision of the Code mentioned above. This report describes the method, system configuration, and procedures for the leakage rate test for reactor containment vessel of HTTR.

JAEA Reports

Maintenance of fuel failure detector system of the HTTR

Noji, Kiyoshi; Kameyama, Yasuhiko; Emori, Koichi; Aono, Tetsuya

JAEA-Testing 2006-003, 47 Pages, 2006/06

JAEA-Testing-2006-003.pdf:7.43MB

The FFD (Fuel Failure Detection) System has been installed in the HTTR in order to detects the abnormal release of fission products from the fuel during the operations. The FFD system samples the primary coolant from the high-temperature plenum division of the reactor core divided into seven regions. The system detects short life fission product(FP) gases from each region. The damaged region can be specified by the FFD system. In the design, it was considered that the change in the sampling flow rate during operation was not necessary. However, it became clear that the measured value became unstable because of a fluctuation of the sampling flow rate due to change in the primary coolant pressure during operation. Moreover, it was difficult to change the sampling flow rate during operation. The sampling flow rate was controlled by manual valves located in the service area where the entry is limited during operation. Therefore, an improvement was carried out to control the sampling flow rate from the outside of the service area. The stable measured value was obtained by the improvement. Moreover, noise reduction, improvement of oil level gauge of compressors gives excellent operation of the FFD. This report summarizes the maintenance work of detectors (precipitator), equipment and improvement items of the system.

JAEA Reports

Maintenance and management of emergency air purification system in HTTR

Aono, Tetsuya; Kondo, Masaaki; Sekita, Kenji; Emori, Koichi; Kuroha, Misao; Ouchi, Hiroshi

JAEA-Testing 2006-004, 39 Pages, 2006/06

JAEA-Testing-2006-004.pdf:9.88MB

The High Temperature Engineering Test Reactor (HTTR) has an emergency air purification system(EAPS). The system keeps the service area negative pressure condition and exhausts the filtered air to prevent fission products release to environment in accident condition. The EAPS is one of the engineered safety features which is started automatically when radioactivity in the service area increase or might increase. The performance of the EAPS should satisfy the analytical condition for public dose evaluation in the severest accidents of the HTTR. The performance should be confirmed by function tests. The function tests are divided into many tests corresponding to each assumed phenomenon. The confirmation of the performance of the system was carried out effectively by the tests. Moreover, the stable operation of the system can be achieved by improvements of the method of leak tight tests of exhaust filter unit. The report describes the outline of EAPS system, maintenance works and improvement of the system.

JAEA Reports

Operation and maintenance manual of the accelerator installed in the facility of radiation standards

Fujii, Katsutoshi; Kawasaki, Katsuya; Kowatari, Munehiko; Tanimura, Yoshihiko; Kajimoto, Yoichi; Shimizu, Shigeru

JAEA-Testing 2006-005, 146 Pages, 2006/08

JAEA-Testing-2006-005.pdf:19.71MB

4MV Van de Graff accelerator was installed in the Facility of Radiation Standards (FRS) in June 2000, and monoenergetic neutron calibration fields and high energy $$gamma$$-ray calibration fields have been developed. The calibration fields are provided for R&D on dosimetry, and for the calibration and type-test of radiation protection instruments. This article describes the operational procedure, the maintenance work and the operation of the related apparatuses of the accelerator. This article focuses on the sufficient safety and radiation control for the operators, the maintenance performance of the accelerator, and on the prevention of the malfunction due to the mistakes of the operator. This article targets the unexperienced engineers in charge of operation and maintenance of the accelerator.

JAEA Reports

User's guide of DETRAS system, 1; Construction and usage of the reactor simulator operation system at the nuclear technology and education center

Yamaguchi, Yukichi*

JAEA-Testing 2006-006, 21 Pages, 2006/12

JAEA-Testing-2006-006.pdf:3.16MB

DETRAS system is a PWR reactor simulator system for operation training whose distinguished feature is that it can be operated from the remote place of the simulator site. This document is the first one of a series of three volumes of the users guide of DETRAS. It describes setup of the network consisting of computer related devices at the Nuclear Technology and Education Center (NuTEC) of JAEA and gives explanation of startup and shutdown procedures of the simulator system.

JAEA Reports

User's guide of DETRAS system, 2; Setup of DETRAS system and its startup

Yamaguchi, Yukichi*

JAEA-Testing 2006-007, 42 Pages, 2007/01

JAEA-Testing-2006-007.pdf:10.17MB

DETRAS system is a PWR reactor simulator system for operation training whose distinguished feature is that it can be operated from the remote place of the simulator site. This document is the second one of a series of three volumes of the users guide of DETRAS. It describes a startup procedure of the DETRAS system over the simulator area, the local network involving the simulator and then gives explanation about the procedure of remote access from outside of the simulator area for startup and shutdown of the simulator.

JAEA Reports

User's guide of DETRAS system, 3; Description of the simulated reactor plant

Yamaguchi, Yukichi*

JAEA-Testing 2006-008, 130 Pages, 2006/12

JAEA-Testing-2006-008.pdf:22.2MB

DETRAS system is a PWR reactor simulator system for operation training whose distinguished feature is that it can be operated from the remote place of the simulator site. This document is a third one of a series of three volumes of the users guide of DETRAS. It describes firstly an outline of the simulated reactor system and then a users interface needed for operation of the simulator of interest and finally a series of procedure for startup of the simulated reactor and shutdown of it from its rated operation state.

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