Seismic design

Iigaki, Kazuhiko; Hanawa, Satoshi

doi:10.1016/j.nucengdes.2004.07.011

Cited by 3 publications

(1 citation statement)

References 1 publication

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“…The seismic classification is the same as that of LWRs. The details are described in "Seismic design of the HTTR" (Iigaki and Hanawa, 2004) in the same Nuclear Engineering and Design issue.…”

Section: Seismic Designmentioning

confidence: 99%

Safety design

Kunitomi¹,

Shiozawa²

2004

Nuclear Engineering and Design

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JAERI established the safety design philosophy of the HTTR based on that of current reactors such as LWR in Japan, considering inherent safety features of the HTTR. The strategy of defense in depth was implemented so that the safety engineering functions such as control of reactivity, removal of residual heat and confinement of fission products shall be well performed to ensure safety. However, unlike the LWR, the inherent design features of the high-temperature gas-cooled reactor (HTGR) enables the HTTR meet stringent regulatory criteria without much dependence on active safety systems. On the other hand, the safety in an accident typical to the HTGR such as the depressurization accident initiated by a primary pipe rupture shall be ensured. The safety design philosophy of the HTTR considers these unique features appropriately and is expected to be the basis for future Japanese HTGRs.This paper describes the safety design philosophy and safety evaluation procedure of the HTTR especially focusing on unique considerations to the HTTR. Also, experiences obtained from an HTTR safety review and R&D needs for establishing the safety philosophy for the future HTGRs are reported.

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Section: Seismic Designmentioning

confidence: 99%

Safety design

Kunitomi¹,

Shiozawa²

2004

Nuclear Engineering and Design

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Design of High Temperature Engineering Test Reactor (HTTR)

Fujiwara

Goto

Iigaki

et al. 2021

High Temperature Gas-Cooled Reactors

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A safety evaluation of HTTR core graphite structures against the great east japan earthquake

Iigaki

Ono

Shimazaki

et al. 2014

Mechanical Engineering Journal

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On March 11th, 2011, the Great East Japan Earthquake which is one of the largest earthquakes in japan occurred and the maximum acceleration in observed seismic wave in the HTTR exceeded the design value in a part of input seismic motions. Therefore, a visual inspection, a seismic analysis and a performance confirmation test of facilities were carried out in order to confirm the integrity of facility after the earthquake. The seismic analysis was carried out for the reactor core structures by using the response magnification factor method. As the results of the evaluation, the generated stress in the graphite blocks in the reactor core at the earthquake were well below the allowable values of safety criteria, and thus the structural integrity of the reactor core was confirmed. The integrity of reactor core was also supported by the visual inspections of facilities and the operation without reactor power in cold conditions of HTTR.

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Seismic design

Cited by 3 publications

References 1 publication

Safety design

Safety design

Design of High Temperature Engineering Test Reactor (HTTR)

A safety evaluation of HTTR core graphite structures against the great east japan earthquake

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