Nonlinear Structural Analysis of the Spent Nuclear Fuel Disposal Canister Subjected to an Accidental Drop and Ground Impact Event

Young-Joo Kwon

doi:10.7734/COSEIK.2019.32.2.75

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2019 Vol.32, Issue 2 Next Page

Nonlinear Structural Analysis of the Spent Nuclear Fuel Disposal Canister Subjected to an Accidental Drop and Ground Impact Event 추락낙하 사고 시 지면과 충돌하는 고준위폐기물 처분용기의 비선형구조해석

2019. pp. 75-86

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Abstract

The biggest obstacle in the nuclear power generation is the high level radioactive waste such as the spent nuclear fuel. High level radioactivities and generated heat make the safe treatment of the spent nuclear fuel very difficult. Nowadays, the only treatment method is a deep geological disposal technology. This paper treats the structural safe design problem of the spent nuclear fuel disposal canister which is one of the core technologies of the deep geological disposal technology. Especially, this paper executed the nonlinear structural analysis for the stresses and deformations occurring in the canister due to the impulsive force applied to the spent nuclear fuel disposal canister in the case of an accidental drop and ground impact event from the transportation vehicle in the repository. The main content of the analysis is about that the impulsive force is obtained using the commercial rigid body dynamic analysis computer code, RecurDyn, and the stress and deformation caused by this impulsive force are obtained using the commercial finite element static structural analysis computer code, NISA. The analysis results show that large stresses and deformations may occur in the canister, especially in the rid or the bottom of the canister, due to the impulsive force occurring during the collision impact period.

Keywords

spent nuclear fuel

disposal canister

nonlinear structural analysis

finite element static structural analysis

accidental drop and impact event

impulsive force

commercial computer code

원자력발전의 최대 걸림돌은 사용 후 핵연료인 고준위폐기물이다. 높은 방사능과 발생하는 열은 사용 후 핵연료의 안전한 처분을 어렵게 하고 있다. 현재 유일한 처리방법은 심지층 처분기술이다. 본 논문은 이와 같은 심지층 처분기술의 핵심기술 중의 하나인 처분용기의 구조안전성 설계문제를 다루고 있다. 특히 처분장에서 처분용기 처분 시 사고로 운송차량에서 추락 낙하 하여 지면과 충돌하는 경우 처분용기에 가해지는 충격력에 의하여 처분용기에 발생하는 응력 및 변형에 대한 비선형구 조해석을 수행하였다. 해석의 주된 내용은 심지층 처분장에서 운반차량으로 처분용기 운반 중 사고로 추락낙하 하여 지면과의 충돌 시에 처분용기에 가해지는 충격력을 기구동역학해석 상용 컴퓨터코드인 RecurDyn으로 구하고 이 충격력에 의하여 처 분용기에 발생하는 응력 및 변형을 유한요소 정적 구조해석 상용 컴퓨터코드인 NISA를 이용하여 구한 것이다. 해석결과는 충돌 충격 시간 중 발생하여 처분용기에 가해지는 충격력에 의하여 처분용기, 특히 처분용기의 위 덮개 혹은 아래 덮개에 큰 응력과 대변형이 발생함을 보여주고 있다.

키워드

사용 후 핵연료

처분용기

비선형 구조해석

유한요소 정적 구조해석

추락낙하 충격사고

충격력

상용 컴퓨터코드

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Information

Publisher :Computational Structural Engineering Institute of Korea
Publisher(Ko) :한국전산구조공학회
Journal Title :Journal of the Computational Structural Engineering Institute of Korea
Journal Title(Ko) :한국전산구조공학회 논문집
Volume : 32
No :2
Pages :75-86
Received Date : 2018-08-23
Revised Date : 2019-01-14
Accepted Date : 2019-02-08
DOI :https://doi.org/10.7734/COSEIK.2019.32.2.75

Journal of the Computational Structural Engineering Institute of Korea ISSN:1229-3059(Print) 2287-2302(Online) 한국전산구조공학회 논문집

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