원전해체시 독립된 사용후핵연료저장조 국내 적용 검토

국문 초록 (Abstract)

국내 원자력발전소에서는 사용후핵연료 저장용량의 확대를 위해 사용후핵연료저장조에 조밀저장대를 설치하고 있지만 한 빛원전은 2024년에 포화가 예상된다. 또한 10개의 원자력발전소가 2029년까지 설계수명에 도달하게 된다. 하지만 원전운영 과 해체를 위한 국내 사용후핵연료 관리정책은 아직 결정되지 않은 상황이다. 미국의 경우 원전해체시 사용후핵연료를 중간 저장시설 또는 영구처분장으로 이송하기 전까지 임시적으로 독립된 사용후연료저장조(이하 ‘SFPI’) 방식을 운영하는 사례가 있다. SFPI는 원전해체시 운전정지 후 사용후핵연료를 저장하는데 있어서 방사선 노출 저감, 운영비용 절감, 안전성 보강 등 의 효과를 기대할 수 있다. 따라서 이 논문에서는 미국의 SFPI 운영경험, 시스템, 적용규정 등에 대한 사례연구를 수행하였 다. 결론적으로 SFPI 국내 적용을 위해서는 사용후핵연료저장 계통의 설계변경 범위 및 예상 소요비용 확정, 원전 해체계획 에 설비개선 계획 반영제출, 주기적안전성평가(PSR) 방법 등을 활용한 안전성 평가(운영기간 10 년), 설계변경을 위한 운영 변경허가 신청, 규제기관 심사 및 허가 취득, 설계변경 수행, 규제기관의 확인점검, SFPI 운영을 위한 교육 및 시운전, SFPI 운영 및 정기검사, SFPI 해체 등의 절차가 필요하다.

다국어 초록 (Multilingual Abstract)

In many nuclear power plant sites in Korea, high density storage racks were installed in the spent fuel pool to expand the spent fuel storage capacity. Nevertheless, the capability of the Hanbit nuclear site will be saturated by 2024. Also, 10 NPPs will reach their design life expiration date by 2029. In the case of the US, SFPI (Spent Fuel Pool Island) operated temporarily as a spent fuel storage option before spent nuclear fuels were transported to an interim storage facility or a final disposal facility. As a spent fuel storage option after shutdown during decommissioning, the SFPI concept can be expected to have the following effects: reduced occupational exposure, lower cost of operation, strengthened safety, and so on. This paper presents a case study associated with the regulations, operating experiences, and systems of SFPI in the US. In conclusion, the following steps are recommended for applying SFPI during decommissioning in Korea: confirmation of design change scope of SFPI and expected final cost, the submission of a decommissioning plan which is reflected in SFPI improvement plans, safety assessment using PSR, application of an operating license change for design change, regulatory body review and approval, design change, inspection by the regulatory body, education and commissioning for SFPI, SFPI operation and periodic inspection, and dismantling of SFPI.

참고문헌 (Reference)

1 Southern California Edison, "Testimony on the Nuclear Decommissioning of SONGS 2&3, Southern California Edison, 1-14, A1-47, SCE-01"

2 United States Nuclear Regulatory Commission, "Standard Review Plan for the Review of Safety Analysis Reports for Nuclear Power Plants: LWR Edition 9.1.3 Spent Fuel Pool Cooling and Cleanup System"

3 G.V Noordennen, "Spent Fuel Pool Island" 168-176, 1998

4 M.B Lackey, "Spent Fuel Pool Cooling and Cleanup During Decommissioning: Experience at Trojan Nuclear Power Plant" EPRI 1.1-4.1, 1999

5 International Atomic Energy Agency, "Safety Consideration in the Transition from Operation to Decommissioning of nuclear Facilities" IAEA 13-14, 2004

6 Public Engagement Commission on Spet Nuclear Fuel Management, "Reference Document for Public Engagement on Spent Nuclear Fuel"

7 R. Aker, "Maine Yankee Decommissioning Experience Report" New Horizon Scientific 5.1-5.8, 2005

8 I.S. Hwang, "Comparison of Licensing Procedure of Nuclear Power Plant between Korea and USA" 6 (6): 4-15, 2010

9 The Ministry of Trade Industry and Energy, "Atomic Paper 2013"

10 United States Nuclear Regulatory Commission, "10CFR50 Domestic Licensing of Prodcution and Utilization Facilities"