Refine your search:     
Report No.
 - 
Search Results: Records 1-13 displayed on this page of 13
  • 1

Presentation/Publication Type

Initialising ...

Refine

Journal/Book Title

Initialising ...

Meeting title

Initialising ...

First Author

Initialising ...

Keyword

Initialising ...

Language

Initialising ...

Publication Year

Initialising ...

Held year of conference

Initialising ...

Save select records

JAEA Reports

Verification of alternative dew point hygrometer for CV-LRT in MONJU; Short- and long-term verification for capacitance-type dew point hygrometer (Translated document)

Ichikawa, Shoichi; Chiba, Yusuke; Ono, Fumiyasu; Hatori, Masakazu; Kobayashi, Takanori; Uekura, Ryoichi; Hashiri, Nobuo*; Inuzuka, Taisuke*; Kitano, Hiroshi*; Abe, Hisashi*

JAEA-Research 2017-001, 40 Pages, 2017/03

JAEA-Research-2017-001.pdf:5.19MB

In order to reduce the influence on a plant schedule of the MONJU by the maintenance of dew point hygrometers, The JAEA examined a capacitance type dew point hygrometer as an alternative dew point hygrometer for a lithium-chloride type dew point hygrometer which had been used at the CV-LRT in the MONJU. As a result of comparing a capacitance type dew point hygrometer with a lithium-chloride type dew point hygrometer at the CV-LRT (Atmosphere: nitrogen, Testing time: 24 hours), there weren't significant difference between a capacitance type dew point hygrometer and a lithium-chloride type dew point hygrometer. As a result of comparing a capacitance dew point hygrometer with a high-mirror-surface type dew point hygrometer for long term verification (Atmosphere: air, Testing time: 24 months), the JAEA confirmed that a capacitance type dew point hygrometer satisfied the instrument specification ($$pm$$2.04$$^{circ}$$C) required by the JEAC4203-2008.

JAEA Reports

Verification of alternative dew point hygrometer for CV-LRT in Monju

Ichikawa, Shoichi; Chiba, Yusuke; Ono, Fumiyasu; Hatori, Masakazu; Kobayashi, Takanori; Uekura, Ryoichi; Hashiri, Nobuo*; Inuzuka, Taisuke*; Kitano, Hiroshi*; Abe, Hisashi*

JAEA-Research 2016-021, 32 Pages, 2017/02

JAEA-Research-2016-021.pdf:5.0MB

In order to reduce the influence on a plant schedule of the MONJU by the maintenance of dew point hygrometers, The JAEA examined a capacitance type dew point hygrometer as an alternative dew point hygrometer for a lithium-chloride type dew point hygrometer which had been used at the CV-LRT in the MONJU. As a result of comparing a capacitance type dew point hygrometer with a lithium-chloride type dew point hygrometer at the CV-LRT (Atmosphere: nitrogen, Testing time: 24 hours), there weren't significant difference between a capacitance type dew point hygrometer and a lithium-chloride type dew point hygrometer. As a result of comparing a capacitance dew point hygrometer with a high-mirror-surface type dew point hygrometer for long term verification (Atmosphere: air, Testing time: 24 months), the JAEA confirmed that a capacitance type dew point hygrometer satisfied the instrument specification ($$pm$$2.04$$^{circ}$$C) required by the JEAC4203-2008.

JAEA Reports

Cracking investigation of Monju emergency generator C unit cylinder liner; Cylinder liner soundness confirmation by a fall cause of the materials strength of the cylinder liner and the supersonic wave speed

Kobayashi, Takanori; Sakon, Miyoji; Takada, Osamu; Hatori, Masakazu; Sakamoto, Tsutomu; Sato, Toshiyuki; Kazama, Akihito*; Ishizawa, Yoshihiro*; Igawa, Katsuhisa*; Nakae, Hideo*

JAEA-Review 2011-047, 48 Pages, 2012/02

JAEA-Review-2011-047.pdf:9.58MB

I confirmed a leak of the effluent gas from cylinder part during a load examination after the check of the emergency generator C unit on December 28, 2010 of the facilities check average and confirmed crack in No.8 cylinder liner part. As a result, because it was not performed oil pressure management properly without attaching an oil pressure gauge when I removed cylinder liner about the cause, crack occurred by having been able to write excessive stress for the cylinder liner and reached damage. By a process of this investigation, a fall of the materials strength of some cylinder liner was confirmed, but because a lead ingredient got mixed with materials by a casting process at the time of the production of the cylinder liner, as for this, Widmannst tten graphite occurred, and it became clear that materials strength fell. In addition, I performed inspection by the supersonic wave velocity measurement as technique to distinguish this Widmannst tten graphite easily and confirmed that I was effective.

Journal Articles

Design and modification of steam generator safety system of FBR MONJU

Matsuura, Makoto; Hatori, Masakazu; Ikeda, Makinori

Nuclear Engineering and Design, 237(12-13), p.1419 - 1428, 2007/07

 Times Cited Count:16 Percentile:74.96(Nuclear Science & Technology)

MONJU is a prototype Fast Breeder Reactor (FBR) in Japan. The sodium-water reaction in the steam generator (SG) is one of the important safety assessment items for a sodium cooled reactor like MONJU. A latest evaluation method on the design margin against the overheating tube rupture showed that it had not enough margins on the present SG system in the worst case. For improving that margin, it needs to shorten the time of the sodium-water reaction by earlier water leak detection in the SG and sooner water ejection from the SG tubes. Therefore MONJU is now carrying out the following modification works (1) addition of steam relief valves, (2) addition of a gas pressure gauge with changing the interlock logic and lowering the trigger level, (3) reducing the opening of the valves on the SG gas flow line to the dump tank because of earlier detection for the pressure rise. After this modification, the design margin of the SG system will be sufficiently improved. For the tube materials, the value of the cumulative damage for the creep failure will be much smaller than 1, and the equivalent stress for the ductile failure will be much smaller than the tensile strength.

Journal Articles

Heat transfer and fluid flow of benard-cell convection in rectangular container with free surface sensed by infrared thermography

Inagaki, Terumi*; Hatori, Masakazu*; Suzuki, Tomohiro*; Shiina, Yasuaki

Journal of Visualization, 9(2), p.145 - 160, 2006/00

 Times Cited Count:9 Percentile:45.82(Computer Science, Interdisciplinary Applications)

no abstracts in English

Journal Articles

Infrared thermography for analyzing heat transfer and fluid flow of benard-cell convection in a rectangular container with free surface

Inagaki, Terumi*; Hatori, Masakazu*; Suzuki, Tomohiro*; Shiina, Yasuaki

Proceedings of International Conference on Advanced Optical Diagnostics in Fluids, Solids and Combustion (VSJ-SPIE '04) (CD-ROM), 9 Pages, 2004/12

no abstracts in English

Journal Articles

Heat transfer phenomenon of natural convection in an open vessel and its infrared sensing

Inagaki, Terumi*; Kaneko, Toshinobu*; Hatori, Masakazu*; Shiina, Yasuaki

Nihon Kikai Gakkai Rombunshu, B, 70(699), p.279 - 286, 2004/11

no abstracts in English

Oral presentation

Equipments integrity confirmation of fast breeder prototype reactor MONJU, 6; Function test of integrated sodium leak monitoring system

Nishibayashi, Yohei; Matsuno, Hiroki; Hatori, Masakazu

no journal, , 

The cell monitor to detect it at the early stage of the sodium leakage to an integrated leakage monitoring system and overseas heat insulation that consolidated information related to the sodium leakage to offer information on the situation of the site to the driving member in the central control room promptly when the sodium of the coolant leaked, and to support the judgement and displayed it was set up. In the check test such as integrated leakage monitoring systems, the function of this monitoring system and the cell monitor was confirmed.

Oral presentation

Function test of nitrogen gas injection system

Sato, Takeshi; Kobayashi, Takanori; Kato, Masaaki; Hatori, Masakazu

no journal, , 

The modifications of nitrogen gas supply system were made, such as the installation of nitrogen gas storage tanks, the addition of a liquid nitrogen evaporator, and piping installation in each compartment where sodium equipments were installed, in order to suppress sodium fires and have quick closure of the accidents by injecting nitrogen gas into the compartment where a sodium leak occurred when sodium in the equipments of secondary heat transport system leaked. The functions and the performances of these modified system and equipments were confirmed in Function Test of Nitrogen Gas Injection System.

Oral presentation

About the intensity evaluation by the strength reduction of flake graphite cast iron by mixing of Pb, and acoustic velocity

Hatori, Masakazu; Kobayashi, Takanori; Sakamoto, Tsutomu; Nakae, Hideo*

no journal, , 

Since the fall of tensile strength was accepted in high P cast iron which is a kind of flake graphite cast iron, when chemical component analysis was carried out, content of a little Pb(s) and Ca was checked. The Widmannstatten black lead which abnormalities produced in the form of flake graphite was observed by the metal organization of the elegance concerned. For this reason, evaluation of the soundness about other having existing delivered is called for. Although evaluation by the SUMP method was also possible about the existence of Widmannstatten black lead, since carrying out to having existing delivered had a big problem in workability, the valuation method by a non-destructive test was searched for. From it having been reported to the acoustic velocity which spreads the inside of tensile strength and a sample in flake graphite cast iron that correlation is seen, About whether the same relation is realized also in the flake graphite cast iron which widow Widmannstatten black lead which is black lead-shaped abnormalities generated, it checked by carrying out sonic measurement by an ultrasonic thickness gage. Generating of the abnormalities (Widmannstatten black lead) of the black lead form by mixing of Pb and the fall of the tensile strength accompanying this were accepted, and the result checked that correlation was between the acoustic velocity which spreads the inside of a sample, and tensile strength. Thereby, it is thought that discernment by un-destroying of flake graphite cast iron with the possibility of Pb mixing was attained.

Oral presentation

Verification test of alternative dew point detector for CV-LRT in Monju

Chiba, Yusuke; Ichikawa, Shoichi; Ono, Shimpei; Hatori, Masakazu; Kobayashi, Takanori; Uekura, Ryoichi; Hashiri, Nobuo*; Inuzuka, Taisuke*; Abe, Hisashi*; Kitano, Hiroshi*

no journal, , 

The lithium chloride-type dew point detector was used for reactor containment vessel the entire leak rate test (CV-LRT) in fast-breeder reactor Monju (Monju) which needs the maintenance every three months. But when the plant process is considered, it's desirable for the maintenance periods beyond 12 months. Thereupon the capacitance-type dew point detector made in VAISALA Corporation was nominated as the alternative lithium chloride-type dew point detector in Monju. The lithium chloride-type dew point detector, when it's adopted, for, to have to be satisfied a request of the regulations, it's necessary to estimate the performance of the lithium chloride-type dew point detector. In the condition of the CV-LRT, the dew point data were measured by the capacitance-type dew point detector and the lithium chloride-type dew point detector for 24 hours. These data were compared and the performance of the capacitance-type dew point detector was estimated. Furthermore, the dew point data of Monju under the atmosphere ware continuously measured by the capacitance-type dew point detector and the mirror surface-type dew point detector for 2 years. These data were compared and the performance of the capacitance-type dew point detector was estimated. As a result, the capacitance-type dew point detector was confirmed that had the instrument precision that JEAC4203-2008 required.

Oral presentation

Verification of alternative dew point hygrometer for CV-LRT in MONJU; Short and long-term verification for capacitance type dew point hygrometer

Hatori, Masakazu; Ichikawa, Shoichi; Chiba, Yusuke; Kobayashi, Takanori; Uekura, Ryoichi; Hashiri, Nobuo*; Inuzuka, Taisuke*; Kitano, Hiroshi*; Abe, Hisashi*; Ono, Fumiyasu

no journal, , 

In order to reduce the influence on a plant schedule of Monju by the maintenance of dew point hygrometers, JAEA Agency examined a capacitance type dew point hygrometer as an alternative dew point hygrometer for a lithium-chloride type dew point hygrometer which had been used at the containment vessel leak rate test in Monju. As a result of comparing a capacitance type dew point hygrometer with a lithium-chloride type dew point hygrometer at the CV-LRT (Atmosphere: nitrogen, testing time/24 hours), there was no significant difference between a capacitance type dew point hygrometer and a lithium-chloride type dew point hygrometer. As a result of comparing a capacitance dew point hygrometer with a high-precision-mirror-surface type dew point hygrometer for long term verification (Atmosphere: air, testing time: 24 months), it was confirmed that a capacitance type dew point hygrometer satisfied the instrument specification required by the CV-LRT. There are no other cases where atmosphere measurement has been carried out for a long time by existing measuring instruments.

Oral presentation

On the operation of ventilation air-conditioning equipment for MONJU during decommissioning phase

Ookubo, Manabu; Shimizu, Ryo; Hatori, Masakazu; Kobayashi, Takanori; Uekura, Ryoichi

no journal, , 

Under the circumstances where the fuel is disposed in the reactor core and the furnace fuel storage tank during the decommissioning measures of "Monju" where the decay heat is at an extremely low level, while preventing the sodium from being frozen by the preheater heater, It is desirable to continue operation of cooling the dissipated heat released into the compartment by ventilating air conditioning equipment. However, the operation of ventilation air conditioning equipment is designed for normal operation of nuclear reactors, and it is necessary to review the proper operation according to the situation at the stage of decommissioning. In this report, we will summarize the relationship between the actual load and the capacity of the ventilating and air conditioning equipment based on the past operation data and report on the status of consideration on rational ventilation air conditioning equipment operation at the decommissioning stage.

13 (Records 1-13 displayed on this page)
  • 1