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Confirmation of Seismic Integrity of HTTR against 2011 Great East Japan 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, Oarai-machi, Higashi-ibarakigun, Ibaraki, 311-1393, Japan
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, Oarai-machi, Higashi-ibarakigun, Ibaraki, 311-1393, Japan
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, Oarai-machi, Higashi-ibarakigun, Ibaraki, 311-1393, Japan
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, Oarai-machi, Higashi-ibarakigun, Ibaraki, 311-1393, Japan
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, Oarai-machi, Higashi-ibarakigun, Ibaraki, 311-1393, Japan
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, Oarai-machi, Higashi-ibarakigun, Ibaraki, 311-1393, Japan
inoi.hiroyuki@jaea.go.jp

Toshinari Kondo

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

Keidai Kojima

Construction Department, Common Mission Sector, Japan Atomic Energy Agency, 2-4 Shirane, Shirakata, Tokai-mura, Naka-gun, Ibaraki, 319-11195, Japan
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, Oarai-machi, Higashi-ibarakigun, Ibaraki, 311-1393, Japan
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, Oarai-machi, Higashi-ibarakigun, Ibaraki, 311-1393, Japan
sawa.kazuhiro@jaea.go.jp

1Corresponding author.

ASME doi:10.1115/1.4039288 History: Received September 15, 2016; Revised December 12, 2017

Abstract

On March 11th, 2011, the Great East Japan 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 instrument. 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 instrument." The other is the "seismic response analysis" for the building structure, equipment and instrument using the observed earthquake. All equipment and instrument 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 instrument 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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