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Mohamad A, Nakajima K, Miwa S, Osaka M. Chemical interaction between Sr vapor species and nuclear reactor core structure. J NUCL SCI TECHNOL 2022. [DOI: 10.1080/00223131.2022.2092227] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
Affiliation(s)
- Afiqa Mohamad
- Nuclear Science and Engineering Center, Japan Atomic Energy Agency, Ibaraki, Japan
| | - Kunihisa Nakajima
- Nuclear Science and Engineering Center, Japan Atomic Energy Agency, Ibaraki, Japan
| | - Shuhei Miwa
- Nuclear Science and Engineering Center, Japan Atomic Energy Agency, Ibaraki, Japan
| | - Masahiko Osaka
- Nuclear Science and Engineering Center, Japan Atomic Energy Agency, Ibaraki, Japan
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2
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Ngarayana IW, Murakami K, Do TMD. Effect of surface oxidation on the cesium chemisorption behavior of SS 304, Inconel 600 and X-750. J NUCL SCI TECHNOL 2022. [DOI: 10.1080/00223131.2022.2029608] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Affiliation(s)
- I. Wayan Ngarayana
- Nuclear Material & Maintenology Laboratory, Nuclear System Safety Engineering, Nagaoka University of Technology, Nagaoka, Japan
| | - Kenta Murakami
- Nuclear Material & Maintenology Laboratory, Nuclear System Safety Engineering, Nagaoka University of Technology, Nagaoka, Japan
- Nuclear Professional School, School of Engineering, Tokyo University, Tokyo, Japan
| | - Thi-Mai-Dung Do
- Nuclear Material & Maintenology Laboratory, Nuclear System Safety Engineering, Nagaoka University of Technology, Nagaoka, Japan
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3
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Rizaal M, Miwa S, Suzuki E, Imoto J, Osaka M, Gouëllo M. Revaporization Behavior of Cesium and Iodine Compounds from Their Deposits in the Steam-Boron Atmosphere. ACS OMEGA 2021; 6:32695-32708. [PMID: 34901618 PMCID: PMC8655899 DOI: 10.1021/acsomega.1c04441] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/16/2021] [Accepted: 11/03/2021] [Indexed: 06/14/2023]
Abstract
This paper presents our investigation on cesium and iodine revaporization from cesium iodide (CsI) deposits on stainless steel type 304L, which were initiated by boron and/or steam flow. A dedicated basic experimental facility with a thermal gradient tube (TGT) having a temperature range of 1000-400 K was used for simulating the phenomena. In the absence of boron, it was found that the initially deposited CsI at 850 K could be revaporized as CsI vapor/aerosol or reacted with the carrier gas and stainless steel (Cr2O3 layer) to form Cs2CrO4. The latter mechanism consequently released gaseous iodine that was later accumulated downstream. After introducing boron to the steam flow, a severe revaporization occurred. This, in addition to the revaporized CsI vapor/aerosol, was caused by cesium borate (Cs2B4O7 and CsB5O8) formation, which then largely released gaseous iodine that was capable of reaching the TGT outlet (<400 K). In the case of a nuclear severe accident, our study has demonstrated that an increase of gaseous iodine in the colder region of a reactor could occur after late release of boron or a subsequent steam flow after refloods of the reactor, thus posing its inherent risk once leaked to the environment.
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Affiliation(s)
- Muhammad Rizaal
- Nuclear
Science and Engineering Center, Japan Atomic
Energy Agency, 2-4 Shirane, Shirakata, Naka-gun, Tokai-mura, Ibaraki 319-1195, Japan
| | - Shuhei Miwa
- Nuclear
Science and Engineering Center, Japan Atomic
Energy Agency, 2-4 Shirane, Shirakata, Naka-gun, Tokai-mura, Ibaraki 319-1195, Japan
| | - Eriko Suzuki
- Nuclear
Science and Engineering Center, Japan Atomic
Energy Agency, 2-4 Shirane, Shirakata, Naka-gun, Tokai-mura, Ibaraki 319-1195, Japan
| | - Junpei Imoto
- Nuclear
Science and Engineering Center, Japan Atomic
Energy Agency, 2-4 Shirane, Shirakata, Naka-gun, Tokai-mura, Ibaraki 319-1195, Japan
| | - Masahiko Osaka
- Nuclear
Science and Engineering Center, Japan Atomic
Energy Agency, 2-4 Shirane, Shirakata, Naka-gun, Tokai-mura, Ibaraki 319-1195, Japan
| | - Mélany Gouëllo
- VTT
Technical Research Centre of Finland,
P.O. Box 1000, Espoo FI-02044 VTT, Finland
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Osaka M, Gouëllo M, Nakajima K. Cesium Chemistry in the LWR severe accident and towards the decommissioning of Fukushima Daiichi Nuclear Power Station. J NUCL SCI TECHNOL 2021. [DOI: 10.1080/00223131.2021.1997664] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Affiliation(s)
- Masahiko Osaka
- Nuclear Science and Engineering Center, Japan Atomic Energy Agency, Ibaraki, Japan
| | - Mélany Gouëllo
- Severe Accident Analysis, VTT Technical Research Centre of Finland Ltd, Finland
| | - Kunihisa Nakajima
- Nuclear Science and Engineering Center, Japan Atomic Energy Agency, Ibaraki, Japan
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Suzuki C, Nakajima K, Osaka M. Phase stability of Cs-Si-O and Cs-Si-Fe-O compounds on stainless steel. J NUCL SCI TECHNOL 2021. [DOI: 10.1080/00223131.2021.1971576] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Affiliation(s)
- Chikashi Suzuki
- Nuclear Science and Engineering Center, Japan Atomic Energy Agency, Naka-gun, Japan
| | - Kunihisa Nakajima
- Nuclear Science and Engineering Center, Japan Atomic Energy Agency, Naka-gun, Japan
| | - Masahiko Osaka
- Nuclear Science and Engineering Center, Japan Atomic Energy Agency, Naka-gun, Japan
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Park Y, Shin H, Kim S, Jin Y, Kim DH, Jae M. Analysis of severe accident progression and Cs behavior for SBO event during mid-loop operation of OPR1000 using MELCOR. NUCLEAR ENGINEERING AND TECHNOLOGY 2021. [DOI: 10.1016/j.net.2021.03.006] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Rizaal M, Nakajima K, Saito T, Osaka M, Okamoto K. Investigation of high-temperature chemical interaction of calcium silicate insulation and cesium hydroxide. J NUCL SCI TECHNOL 2020. [DOI: 10.1080/00223131.2020.1755733] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Affiliation(s)
- Muhammad Rizaal
- Nuclear Science and Engineering Center, Japan Atomic Energy Agency, Ibaraki, Japan
- Department of Nuclear Engineering and Management, School of Engineering, The University of Tokyo, Tokyo, Japan
| | - Kunihisa Nakajima
- Nuclear Science and Engineering Center, Japan Atomic Energy Agency, Ibaraki, Japan
| | - Takumi Saito
- Nuclear Professional School, School of Engineering, The University of Tokyo, Ibaraki, Japan
| | - Masahiko Osaka
- Nuclear Science and Engineering Center, Japan Atomic Energy Agency, Ibaraki, Japan
| | - Koji Okamoto
- Nuclear Professional School, School of Engineering, The University of Tokyo, Ibaraki, Japan
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Suzuki E, Nakajima K, Osaka M, Ohishi Y, Muta H, Kurosaki K. Low temperature heat capacity of Cs2Si4O9. J NUCL SCI TECHNOL 2020. [DOI: 10.1080/00223131.2020.1727374] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Affiliation(s)
- Eriko Suzuki
- Nuclear Science and Engineering Center, Japan Atomic Energy Agency, Ibaraki, Japan
| | - Kunihisa Nakajima
- Nuclear Science and Engineering Center, Japan Atomic Energy Agency, Ibaraki, Japan
| | - Masahiko Osaka
- Nuclear Science and Engineering Center, Japan Atomic Energy Agency, Ibaraki, Japan
| | - Yuji Ohishi
- Division of Sustainable Energy and Environmental Engineering, Graduate School of Engineering, Osaka University, Osaka, Japan
| | - Hiroaki Muta
- Division of Sustainable Energy and Environmental Engineering, Graduate School of Engineering, Osaka University, Osaka, Japan
| | - Ken Kurosaki
- Division of Sustainable Energy and Environmental Engineering, Graduate School of Engineering, Osaka University, Osaka, Japan
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