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Hattori, Shuji*; Inoue, Fumitaka*; Kurachi, Hiroaki*; Tsukimori, Kazuyuki; Yada, Hiroki
no journal, ,
no abstracts in English
Ishii, Hirotake*; Shimoda, Hiroshi*; Bian, Z.*; Nakai, Toshinori*; Izumi, Masanori; Morishita, Yoshitsugu; Kanehira, Yoshiki*
no journal, ,
A support method of decommissioning work of nuclear power plants using Augmented Reality was proposed and a prototype system was developed. Then, using the prototype system, the proposed method was evaluated. Three workers used the prototype system along with a scenario which dismantles an ion tower, and then questionnaire and interview investigation was conducted. As the results, it was found that the proposed method that records the cutting parts on the CAD data using a stylus pen was easy and effective compared to the legacy recording method using paper documents, but a new tablet PC that has a larger screen with lighter weight is necessary in order to apply the proposed method to the real decommissioning work.
Ito, Hiroto; Onizawa, Kunio
no journal, ,
This study proposes models for ultrasonic testing (UT) accuracy at In-Service Inspection (ISI) in probabilistic fracture mechanics (PFM) analysis. Regression analysis of the data brought by Ultrasonic Test & Evaluation for Maintenance Standards (UTS) project and modeling for successful candidates of Performance demonstration certification system provided the models for accuracy of flaw detection and sizing. New PFM analysis code, which evaluates failure probabilities at weld lines in piping aged by Stress Corrosion Cracking, has been developed by JAEA. The models were introduced into the code. Failure probabilities under the UT models at a weld line were evaluated by the code.
Okamoto, Hisahiko; Tagawa, Akihiro; Ueda, Masashi; Yamashita, Takuya
no journal, ,
In-service inspection (ISI) is carried out to confirm the integrity of the main components of the Fast Breeder Reactor (FBR) "MONJU". The reactor vessel (RV) is the most important component of the FBR. Using the RV-ISI device it is conducted a visual test along the weld line of the reactor vessel. The inspection is carried out using a CCD camera for visual tests at elevated temperature (200 deg.) and high irradiation dose condition (10Sv/hr). Presently, the manufacture of the new device was ended and the performance test is carried out. This paper describes the result of the performance test using a mockup.
Mihalache, O.; Yamaguchi, Toshihiko; Yamashita, Takuya
no journal, ,
In the present paper it is estimated the feasibility of using a multi-frequency algorithm to suppress eddy current signal from sodium bands deposits outside of magnetic steam generator tubes in fast breeder reactors. The ECT signal from outer defects in SG tubes is modeled using a finite element code. The paper presents a detailed analysis of revealing defects under sodium bands using a tuned multi-frequency eddy current algorithm.
Tagawa, Akihiro; Narisawa, Masataka*; Yamashita, Takuya
no journal, ,
This paper describes the development of a new inspection robot for the in-service inspection (ISI) of the heat transfer system of the FBR MONJU. The inspection is carried out using a tire type for volumetric tests at elevated temperature (Atmosphere 55 
C, Piping Surface 80 C) and irradiation dose condition (Dose Rate 10mSv/h, Piping Surface Dose Rate 15mSv/h). The inspection robot which took in a new tire type ultrasonic testing sensor and a new control method was developed.Detection goals that signal to noise ratio by over 2 for 50% thickness defect of wall were attained as a result of the functional test.