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Akademický článek

New insight on the thermal impact on cementitious materials due to high-temperature with water supply: Continuous expansive spalling in water

Autor: Taito Miura, Shintaro Miyamoto, Ippei Maruyama, Abudushalamu Aili, Takumi Sato, Yuji Nagae, Go Igarashi

Publikováno v: Case Studies in Construction Materials, Vol 21, Iss , Pp e03571- (2024)

In this study, the expansion behavior of cement materials after high-temperature heating and water immersion was observed experimentally. Two experiments were conducted using mortar specimens with different sand-to-cement ratios subjected to differen

Externí odkaz: https://doaj.org/article/b457571baedb4b8aaa8ce82f089738f1

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Akademický článek

The key role of sample analysis in Fukushima Dai-Ichi decommissioning, debris management, and accident progression investigation

Autor: Bella Zubekhina, Anton Pshenichnikov, Yuji Nagae, Masaki Kurata

Publikováno v: Frontiers in Nuclear Engineering, Vol 2 (2023)

This review is an up-to-date report of the analysis of U-bearing samples from the Fukushima Daiichi Nuclear Power Station (1F). It summarizes the experience gained after previous severe nuclear accidents in the field of fuel debris analysis and the u

Externí odkaz: https://doaj.org/article/2b1bd26973dd4c14ad5b4686e250d7ab

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Akademický článek

On the degradation progression of a BWR control blade under high-temperature steam-starved conditions

Autor: Anton PSHENICHNIKOV, Yuji NAGAE, Masaki KURATA

Publikováno v: Mechanical Engineering Journal, Vol 7, Iss 3, Pp 19-00503-19-00503 (2020)

High-temperature control blade degradation tests simulating a beginning phase of a severe accident in BWRs has been comprehensively performed in Japan Atomic Energy Agency (JAEA). In the latest test, a mock-up of BWR bundle material has been investig

Externí odkaz: https://doaj.org/article/40f94824f5da4d49bf48827b2aeef709

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Akademický článek

Raman characterization of the simulated control blade debris to understand the boric compounds transformations during severe accidents

Autor: Anton PSHENICHNIKOV, Yuji NAGAE, Masaki KURATA

Publikováno v: Mechanical Engineering Journal, Vol 7, Iss 2, Pp 19-00477-19-00477 (2020)

In order to address the challenge of the future Fukushima Dai-Ichi Nuclear Power Station (1F) debris characterization a new Raman spectroscopy investigation of simulated debris obtained after two control blade degradation tests CLADS-MADE-01 and CLAD

Externí odkaz: https://doaj.org/article/22b00c51730f440e99f2e06c2476838e

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A BWR control blade degradation observed in situ during a CLADS-MADE-02 test under Fukushima Dai-Ichi Unit 3 postulated conditions

Autor: Yuji Nagae, Masaki Kurata, Anton Pshenichnikov

Publikováno v: Journal of Nuclear Science and Technology. 58:1025-1037

The paper summarizes the results of the control blade degradation test CLADS-MADE-02 performed in the Japan Atomic Energy Agency . The test focused on the beginning phase of the accident at Fukushi...

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::b18886519611045e67e9c67b286892c0
https://doi.org/10.1080/00223131.2021.1906777

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Effects of Helium Production and Displacement Damage on Microstructural Evolution and Mechanical Properties in Helium-Implanted Austenitic Stainless Steel and Ferritic/Martensitic Steel

Autor: Eiichi Wakai, Tomoaki Suzudo, Nariaki Okubo, Masataka Yamaguchi, Yuji Nagae, Hiroaki Abe, Akira Hasegawa, Shuhei Nogami, Takashi Tanno, Shigeru Takaya, Kazumi Aoto

Publikováno v: Materials Science Forum. 1024:53-69

The effects of helium concentration and displacement damage on microstructural evolution at low dpa and low helium concentration were mainly investigated in specimens of austenitic stainless steel 316FR or SUS304 and a high chromium martensitic steel

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::217375fcfad7f7293c408bb97ad25d4d
https://doi.org/10.4028/www.scientific.net/msf.1024.53

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Comparison of the observed Fukushima Dai-Ichi Unit 2 debris with simulated debris from the CLADS-MADE-01 control blade degradation test

Autor: Masaki Kurata, Yuji Nagae, Anton Pshenichnikov

Publikováno v: Journal of Nuclear Science and Technology. 58:416-425

In February 2019, TEPCO and TOSHIBA designed a robot that can handle the debris, performed a trial investigation of primary containment vessel (PCV) of the Fukushima Dai-Ichi (1F) Unit 2 and publis...

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::233f84e9b04217b6084d2dfc097faea9
https://doi.org/10.1080/00223131.2020.1856734

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