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Research Papers

Development of the Prediction Technology of Cable Disconnection of In-Core Neutron Detector for the Future High-Temperature Gas-Cooled Reactors

[+] Author and Article Information
Yosuke Shimazaki

HTTR Reactor Engineering Section,
Department of HTTR,
Oarai Research and Development Center, Sector of Nuclear Science Research, Japan Atomic Energy Agency (JAEA), 4002 Narita-cho, Oarai-machi, Higashiobaraki-gun, Ibaraki 311-1393, Japan
e-mail: shimazaki.yosuke@jaea.go.jp

Hiroaki Sawahata

HTTR Operation and Maintenance Section,
Department of HTTR,
Oarai Research and Development Center, Sector of Nuclear Science Research, Japan Atomic Energy Agency (JAEA), 4002 Narita-cho, Oarai-machi, Higashiobaraki-gun, Ibaraki 311-1393, Japan
e-mail: sawahata.hiroaki@jaea.go.jp

Taiki Kawamoto

HTTR Operation and Maintenance Section,
Department of HTTR,
Oarai Research and Development Center, Sector of Nuclear Science Research, Japan Atomic Energy Agency (JAEA), 4002 Narita-cho, Oarai-machi, Higashiobaraki-gun, Ibaraki 311-1393, Japan
e-mail: kawamoto.taiki@jaea.go.jp

Hisashi Suzuki

HTTR Operation and Maintenance Section,
Department of HTTR,
Oarai Research and Development Center, Sector of Nuclear Science Research, Japan Atomic Energy Agency (JAEA), 4002 Narita-cho, Oarai-machi, Higashiobaraki-gun, Ibaraki 311-1393, Japan
e-mail: suzuki.hisashi@jaea.go.jp

Masanori Shinohara

HTTR Reactor Engineering Section,
Department of HTTR,
Oarai Research and Development Center, Sector of Nuclear Science Research, Japan Atomic Energy Agency (JAEA), 4002 Narita-cho, Oarai-machi, Higashiobaraki-gun, Ibaraki 311-1393, Japan
e-mail: shinohara.masanori@jaea.go.jp

Yuki Honda

HTTR Reactor Engineering Section,
Department of HTTR,
Oarai Research and Development Center, Sector of Nuclear Science Research, Japan Atomic Energy Agency (JAEA), 4002 Narita-cho, Oarai-machi, Higashiobaraki-gun, Ibaraki 311-1393, Japan
e-mail: honda.yuki@jaea.go.jp

Kozo Katsuyama

Alpha-Gamma Section,
Fukushima Fuels and Materials Department,
Oarai Research and Development Center, Sector of Fukushima Research and Development, Japan Atomic Energy Agency (JAEA), 4002 Narita-cho, Oarai-machi, Higashiobaraki-gun, Ibaraki 311-1393, Japan
e-mail: katsuyama.kozo@jaea.go.jp

Shoji Takada

HTTR Reactor Engineering Section,
Department of HTTR,
Oarai Research and Development Center, Sector of Nuclear Science Research, Japan Atomic Energy Agency (JAEA), 4002 Narita-cho, Oarai-machi, Higashiobaraki-gun, Ibaraki 311-1393, Japan
e-mail: takada.shoji@jaea.go.jp

Kazuhiro Sawa

Department of HTTR,
Oarai Research and Development Center,
Sector of Nuclear Science Research, Japan Atomic Energy Agency (JAEA), 4002 Narita-cho, Oarai-machi, Higashiobaraki-gun, Ibaraki 311-1393, Japan
e-mail: sawa.kazuhiro@jaea.go.jp

Manuscript received October 1, 2015; final manuscript received January 14, 2016; published online October 12, 2016. Assoc. Editor: Jovica R. Riznic.

ASME J of Nuclear Rad Sci 2(4), 041008 (Oct 12, 2016) (5 pages) Paper No: NERS-15-1201; doi: 10.1115/1.4032597 History: Received October 01, 2015; Accepted January 21, 2016

Maintenance technologies for the reactor system have been developed by using the High Temperature engineering Test Reactor (HTTR). One of the important purposes of development is to accumulate the experiences and data to satisfy the availability of operation up to 90% by shortening the duration of the periodical maintenance for future high-temperature gas-cooled reactors (HTGRs) by shifting from time-based maintenance to condition-based maintenance. The technical issue of the maintenance of the in-core neutron detector, wide range monitor (WRM), is to predict the malfunction caused by cable disconnection to plan the replacement schedule. This is because it is difficult to observe directly inside the WRM in detail. The electrical inspection method was proposed to detect and predict the cable disconnection of the WRM by remote monitoring from outside the reactor using the time-domain reflectometry (TDR). The disconnection position, which was specified by the electrical method, was identified by nondestructive and destructive inspection. The accumulated data are expected to be contributed for advanced maintenance of future HTGRs.

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References

Figures

Grahic Jump Location
Fig. 7

Characteristic impedance of HV side of ch. 3 [3]

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Fig. 1

Arrangement of neutron detector for WRMs and PRMs [5]

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Fig. 8

Tomography of ch. 2 [3]

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Fig. 6

Characteristic impedance of HV side of ch. 2 [3]

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Fig. 5

Result of Case 2 [3]

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Fig. 4

Result of Case 1 [3]

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Fig. 3

Schematic drawing of WRM [3,4]

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Fig. 9

CT value along lead wire around position F of ch. 2 [3]

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