Applied Chemistry for Engineering (공업화학)

The Korean Society of Industrial and Engineering Chemistry (한국공업화학회)
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Plugging and Re-opening Phenomena of the 5Cr-1Mo Steel Leak Hole by Water Leakage in Sodium Atmosphere

소듐 분위기에서 물누출에 의한 5Cr-1Mo Ferrite강 구멍의 막힘과 재개방 현상

  • Jeong, Kyung-Chai (Korea Atomic Energy Research Institute, KALIMER Verification Test Lab.) ;
  • Kim, Tae-Joon (Korea Atomic Energy Research Institute, KALIMER Verification Test Lab.) ;
  • Choi, Jong-Hyeun (Korea Atomic Energy Research Institute, KALIMER Verification Test Lab.) ;
  • Park, Jin-Ho (Korea Atomic Energy Research Institute, KALIMER Verification Test Lab.) ;
  • Hwang, Sung-Tai (Korea Atomic Energy Research Institute, KALIMER Verification Test Lab.)
  • 정경채 (한국원자력연구소 KALIMER검증 시험 Lab.) ;
  • 김태준 (한국원자력연구소 KALIMER검증 시험 Lab.) ;
  • 최종현 (한국원자력연구소 KALIMER검증 시험 Lab.) ;
  • 박진호 (한국원자력연구소 KALIMER검증 시험 Lab.) ;
  • 황성태 (한국원자력연구소 KALIMER검증 시험 Lab.)
  • Received : 1998.03.14
  • Accepted : 1998.06.16
  • Published : 1998.10.10
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Abstract

Small water leak experiment was carried out in liquid sodium atmosphere using a specimen of ferrite steel, which will be expected to be a material of the heat transfer tube of liquid metal fast breeder reactor. Self-plugging phenomena of leak path could be explained by the products of reaction and corrosion by sodium-water reaction. Also, re-opening mechanism of self-plugged path could be explained by the thermal transient and vibration of heat transfer tube. As a result, perfect re-opening time of self-plugged leak path was observed to be 129 minutes after water leak initiation. Re-opening shape of a specimen was appeared with double layer of circular type, and re-opening size of this specimen surface was about 2 mm diameter on sodium side.

액체금속로 증기발생기 전열관 재질로 사용이 예상되는 ferrite steel 시편을 사용해서 소듐분위기에서 미량의 물 누출 실험을 수행하였다. 누출경로는 소듐-물 반응생성물 및 부식생성물에 의한 self-plugging 현상과 열적인 transient 및 전열관의 vibration에 의한 re-opening 메카니즘으로 설명이 가능하였다. 실험결과, 600 Psig의 injection 압력으로 5 g $H_2O$를 소듐분위기 속의 시편으로 누출시킨 경우, 누출초기와 약 70분 경과 후에 약간의 누출 흔적이 보였으나, self-plugging되었던 누출경로는 129분이 경과되자 완전 re-opening된 것으로 확인되었다. 누출시편의 re-opening shape은 2중으로 되어 있었으며, 소듐부위에서 시편 표면에 나타난 re-opening size 약 2 mm의 직경을 나타내었다.

Keywords

Acknowledgement

Grant : 원자력개발 중장기 과제

Supported by : 과기부

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