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  • 한국과학기술정보연구원(KISTI) 서울분원 대회의실(별관 3층)
  • 2024년 07월 03일(수) 13:30
 

  • P-ISSN1225-0163
  • E-ISSN2288-8985
  • SCOPUS, ESCI, KCI

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  • P-ISSN 1225-0163
  • E-ISSN 2288-8985

가압 경수로 사용후핵연료 중 삼중수소 분석

Determination of Tritium in Spent Pressurized Water Reactor (PWR) Fuels

분석과학 / Analytical Science and Technology, (P)1225-0163; (E)2288-8985
2004, v.17 no.5, pp.381-387
이창헌 (한국원자력연구소)
서무열 (한국원자력연구소)
최광순 (한국원자력연구소)
지광용 (한국원자력연구소)
김원호 (한국원자력연구소)
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초록

가압 경수로 사용후핵연료의 화학특성을 규명하기 위하여 극미량 함유되어 있는 삼중수소 (3H)의 정량기술을 확립하였다. 분석과정에서 발생하는 방사성 폐액의 양을 줄이고 분석자의 방사선 피폭을 줄이기 위하여 하나의 시료로부터 14C과 3H를 순차적으로 회수할 수 있도록 분리조건을 최적화하였다. 사용후핵연료를 질산으로 용해하는 과정에서 14CO2와 함께 휘발하는 129I2는 AgNO3가 침윤되어 있는 흡착제로 제거하였다. 14CO2는 1.5 M NaOH에 포집시키고 3H2O는 증류시켜 회수하였다. 3H의 평균 회수율은 97.9%, 상대표준편차는 0.9% (n = 3) 이었으며, 37,000 MWd/MtU 연소도의 사용후핵연료를 대상으로 3H를 분석하고 표준물첨가법으로 분석신뢰도를 평가하였다.

keywords
Tritium, Spent Pressurized Water Reactor (PWR) Fuels, Liquid scintillation counting, Tritium, Spent Pressurized Water Reactor (PWR) Fuels, Liquid scintillation counting

Abstract

To characterize chemically a spent pressurized water reactor (PWR) fuel, an analytical method for trace amounts of tritium (3H) in it has been established. Considering the effective management of radioactive wastes generated through the whole experimental process and the radiological safety for analysts, a separation condition under which 14C and 3H can be sequentially recovered from a single fuel sample was optimized using simulated spent PWR fuel dissolved solutions. 14CO2 evolved during dissolution of the spent PWR fuels with nitric acid was trapped in an aliquot of 1.5 M NaOH. 129I2 which was volatilized along with 14CO2 was removed using a silver nitrate-impregnated silica gel absorbent. 3H remaining in the fuel dissolved solution as 3H2O was selectively recovered by distillation. Its recovery yield was 97.9% with a relative standard deviation of 0.9% (n=3). 3H in a spent PWR fuel with burnup value of 37,000 MWd/MtU was analyzed, reliability of this analytical method being evaluated by standard addition method.

keywords
Tritium, Spent Pressurized Water Reactor (PWR) Fuels, Liquid scintillation counting


참고문헌

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(1983.) Carbon-14 immobilization via the Ba(OH)2,8 H2O process,

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(1979.) Monitoring and removal of gaseous carbon-14 species,

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(1983.) 14C release at light water reactors,

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Dissolution studies of spent nuclear fuels,

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