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SPECIAL SECTION PAPERS

Comprehensive Seismic Evaluation of HTTR Against the 2011 Off the Pacific Coast of Tohoku Earthquake

[+] Author and Article Information
Masato Ono

Department of HTTR,
Oarai Research and Development Center,
Sector of Nuclear Science Research,
Japan Atomic Energy Agency,
4002 Narita-Cho, Higashi-ibarakigun,
Oarai-machi 311-1393, Ibaraki, Japan
e-mail: ono.masato@jaea.go.jp

Kazuhiko Iigaki

Department of HTTR,
Oarai Research and Development Center,
Sector of Nuclear Science Research,
Japan Atomic Energy Agency,
4002 Narita-Cho, Higashi-ibarakigun,
Oarai-machi 311-1393, Ibaraki, Japan
e-mail: iigaki.kazuhiko@jaea.go.jp

Hiroaki Sawahata

Department of HTTR,
Oarai Research and Development Center,
Sector of Nuclear Science Research,
Japan Atomic Energy Agency,
4002 Narita-Cho, Higashi-ibarakigun,
Oarai-machi 311-1393, Ibaraki, Japan
e-mail: sawahata.hiroaki@jaea.go.jp

Yosuke Shimazaki

Department of HTTR,
Oarai Research and Development Center,
Sector of Nuclear Science Research,
Japan Atomic Energy Agency,
4002 Narita-Cho, Higashi-ibarakigun,
Oarai-machi 311-1393, Ibaraki, Japan
e-mail: shimazaki.yosuke@jaea.go.jp

Atsushi Shimizu

Department of HTTR,
Oarai Research and Development Center,
Sector of Nuclear Science Research,
Japan Atomic Energy Agency,
4002 Narita-Cho, Higashi-ibarakigun,
Oarai-machi 311-1393, Ibaraki, Japan
e-mail: shimizu.atsushi35@jaea.go.jp

Hiroyuki Inoi

Department of HTTR,
Oarai Research and Development Center,
Sector of Nuclear Science Research,
Japan Atomic Energy Agency,
4002 Narita-Cho, Higashi-ibarakigun,
Oarai-machi 311-1393, Ibaraki, Japan
e-mail: inoi.hiroyuki@jaea.go.jp

Toshinari Kondo

Construction Department,
Common Mission Sector,
Japan Atomic Energy Agency,
2-4 Shirane, Shirakata, Naka-gun,
Tokai-mura 319-11195, Ibaraki, Japan
e-mail: kondo.toshinari@jaea.go.jp

Keidai Kojima

Construction Department,
Common Mission Sector,
Japan Atomic Energy Agency,
2-4 Shirane, Shirakata, Naka-gun,
Tokai-mura 319-11195, Ibaraki, Japan
e-mail: kojima.keidai@jaea.go.jp

Shoji Takada

Department of HTTR,
Oarai Research and Development Center,
Sector of Nuclear Science Research,
Japan Atomic Energy Agency,
4002 Narita-Cho, Higashi-ibarakigun,
Oarai-machi 311-1393, Ibaraki, 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,
4002 Narita-Cho, Higashi-ibarakigun,
Oarai-machi 311-1393, Ibaraki, Japan
e-mail: sawa.kazuhiro@jaea.go.jp

Manuscript received September 15, 2016; final manuscript received December 12, 2017; published online March 5, 2018. Assoc. Editor: Leon Cizelj.

ASME J of Nuclear Rad Sci 4(2), 020906 (Mar 05, 2018) (8 pages) Paper No: NERS-16-1104; doi: 10.1115/1.4039288 History: Received September 15, 2016; Revised December 12, 2017

On Mar. 11, 2011, the 2011 off the Pacific coast of Tohoku Earthquake of magnitude 9.0 occurred. When the great earthquake occurred, the high temperature engineering test reactor (HTTR) had been stopped under the periodic inspection and maintenance of equipment and instruments. A comprehensive integrity evaluation was carried out for the HTTR facility because the maximum seismic acceleration observed at the HTTR exceeded the maximum value of design basis earthquake. The concept of comprehensive integrity evaluation is divided into two parts. One is the “visual inspection of equipment and instruments.” The other is the “seismic response analysis” for the building structure, equipment and instruments using the observed earthquake. All equipment and instruments related to operation were inspected in the basic inspection. The integrity of the facilities was confirmed by comparing the inspection results or the numerical results with their evaluation criteria. As the results of inspection of equipment and instruments associated with the seismic response analysis, it was judged that there was no problem for operation of the reactor, because there was no damage and performance deterioration. The integrity of HTTR was also supported by the several operations without reactor power in cold conditions of HTTR in 2011, 2013, and 2015. Additionally, the integrity of control rod guide blocks was also confirmed visually when three control rod guide blocks and six replaceable reflector blocks were taken out from reactor core in order to change neutron startup sources in 2015.

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References

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Figures

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Fig. 4

Deformation of guide of piping

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Fig. 8

Analytical result of reactor building (West–East)

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Fig. 5

Seismometer position at the HTTR reactor building: (a) B3F, (b) B1F, (c) 1F, and 2F

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Fig. 6

Analytical model of reactor building (horizontal)

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Fig. 3

Flowchart of inspection and evaluation

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Fig. 2

Positions of the HTTR site and epicenter

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Fig. 1

Bird-eye's view of the HTTR reactor building

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Fig. 7

Analytical result of time history of acceleration of seismic wave and response spectrum: (a) time history of acceleration seismic wave (South) and (b) time history of acceleration seismic wave (North)

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Fig. 9

Evaluation procedure of equipment and instruments

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Fig. 10

Comparison of different pressure of core

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Fig. 11

Appearance inspection of control rod guide block

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