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Safety Review of Severe Accident Senario for Wet Spent Fuel Storage Facility

사용후핵연료 습식저장 시설의 중대사고 안전성 검토

  • Received : 2011.11.23
  • Accepted : 2011.12.21
  • Published : 2011.12.30

Abstract

When the Fukushima nuclear power plant accident occurred in March of 2011, a hydrogen explosion in the reactor building at the 4th unit of Fukushima plants led to a big surprise because the full core of the unit 4 reactor had been moved and stored underwater at the spent nuclear fuel storage pool for periodic maintenance. It was because the possible criticality in the fuel storage pool by coolant loss may yield more severe situation than the similar accident happened inside the reactor vessel. Fortunately, it was assured to be evitable to an anxious situation by a look of water filled in the storage pool later. In the paper, the safety state of the spent fuel storage pool and rack structures of the domestic nuclear plants would be roughly reviewed and compared with the Fukushima plant case by engineering viewpoint of potential severe accidents.

지난 2011년 3월의 후쿠시마 원전 사고시 원자로 건물에서의 연쇄적인 수소폭발이 발생하였을 때 관계자들은 제1원전 4호기의 폭발에 더욱 놀랐었는데 이는 그 당시 4호기는 정기보수를 위하여 원자로내 모든 핵연료를 저장조에 보관중이었기 때문이다. 저장조내 냉각수 유실로 노심에서 옮겨진 핵연료가 공기 중에 노출되어 수소가 발생하고 임계가 도달하였다면 더욱 심각할 수도 있기 때문이었는데 다행히 추후에 양호한 냉각수 상태가 확인되어 우려할 상황을 피할 수 있었다. 본 논문에서는 후쿠시마 원전 사고를 계기로 국내 원자력 발전소내 핵연료 임시 저장시설의 안전성과 관련하여 중대사고 관점에서 검토해 보고자 한다.

Keywords

References

  1. G. C. Song, "Strategy and Roadmap for Spent Fuel Management", Public Listening for Spent Fuel Management Alternative, (2011.08.19).
  2. T. M. Shin, "Seismic Analysis of Spent Fuel Storage Structures for PHWR Plant", Fall Conference of KSNVE. pp.338-344 (2003).
  3. T. M. Shin and I. Y. Kim, "Review on the Seismic Analysis Method of Free Standing High Density Fuel Storage Racks of PWR Plants", Korea Nuclear Society, 27(1) (1997).
  4. T.M. Shin and K.S. Kim, "Study on the Impactproof Internal Structure Design of a Spent Nuclear Fuel Transport Cask", Transactions of the KSNVE, 19(4) (2009).
  5. T.M. Shin, "Analysis of Spent Fuel Storage Racks at Fuel Drop Accident", Fall Conference of KNS (1994).

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