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하나로 2차 냉각탑의 냉각팬 감속기의 진동분석

Vibration Analysis of a Cooling Fan Gear Reducer of the Secondary Cooling Tower in HANARO

  • Park, Young-Chul (Dev. of Research Reactor Engineering, Korea Atomic Energy Research Institute)
  • 투고 : 2010.01.06
  • 심사 : 2010.05.20
  • 발행 : 2010.07.01

초록

하나로는 한국에 설치되어 있는 열출력 30MW의 개방 수조형 연구로 이다. 이는 발전로와 달리 원자로에서 발생하는 열을 이용하여 전기를 생산하는 것 대신에 원자로의 노심 온도를 유지하기 위하여 냉각탑을 통해 대기로 이 열을 냉각한다. 냉각탑 월간 점검 중에 냉각탑 4번의 냉각팬 감속기가 기준을 상회하는 고진동을 기록하였다. 본 연구의 목적은 고진동의 원인을 찾아 정상적으로 수리하기 위함이다. 연구 방법은 FFT 스펙트럼 기법을 적용하여 고진동의 원인을 분석하였다. 그 결과 고진동 주파수는 피니언 기어의 고유 진동수의 두 배인 354Hz이었다. 피니언 기어를 점검한 결과 이빨 표면이 깨져 있었다. 깨진 피니언 기어를 제거하고 새것으로 교체한 후에는 감속기는 정상적으로 작동하였다.

HANARO is an open-tank-in-pool-type Korean research reactor that generates 30MW of thermal power. It differs from power plant reactor in that the heat generated by HANARO is exhausted into the atmosphere through a secondary cooling tower, thus maintaining the core temperature constant. During every monthly inspection of the cooling tower, large vibrations that exceeded the permissible limit were observed at cooling fan gear reducer No. 4 of the cooling tower. The purpose of this study is to identify the origin of the large vibration and to repair it. FFT spectrum analysis is performed to identify the part that caused the large vibration. The results of the frequency analysis showed that the vibration frequency was 354 Hz, which is twice the natural frequency of the pinion gear. A check of the pinion gear revealed that there was a crack on the surface of the pinion gear. After the gear was replaced, the reducer operated normally.

키워드

참고문헌

  1. Park, Y. C. and Wu, J. S., 1996, "SystemPerformance Test in HANARO," the Proceeding ofthe 5th ASRR Vol. 1, pp. 240-246.
  2. Park, Y. C., 2000, "Cooling Tower Capability Test Procedure," Periodic Inspection Procedure, HANTAP-05-RS-ROP-PI-34, KAERI.
  3. Park, Y. C., 1999, "Cooling Tower Inspection,"Periodic Inspection Procedure, HANTAP-05-RS-ROPPI-30, KAERI.
  4. Park, Y. C., et al., 2000, “Evaluation for the Cooling Capability of Secondary Cooling Tower in HANARO,”Proceeding of the KFMA Annual Meeting 2000, pp. 345-350.
  5. Park, Y. C., et al., 2007, "The Results of a SiteRepair after a High Vibration Trip of a SecondaryCooling Fan in HANARO," Transactions of theKorean Nuclear Society Spring Meeting.
  6. Park, Y. C., et al., 2007, "Cooling Tower Overhaulof Secondary Cooling System in HANARO,"Proceedings of the KSME 2007 Spring Meeting,pp.2714-2719.
  7. PRUFTECHNIK, "VIBXPERT, FFT Data Collector& Signal Analyzer," Instruction Manual.
  8. Park, Y. C., 2009, "Technical Specification forRepair of Cooling Tower in HANARO," HAN-SEDD-SP-711-09-001, KAERI.
  9. Marley, "Field Repair Instruction Manual of Series22.2 &22.3, Gear Reducer" p.7.