• Title/Summary/Keyword: HANARO Reactor

Search Result 189, Processing Time 0.032 seconds

Vibration Analysis of a Cooling Fan Gear Reducer of the Secondary Cooling Tower in HANARO (하나로 2차 냉각탑의 냉각팬 감속기의 진동분석)

  • Park, Young-Chul
    • Transactions of the Korean Society of Mechanical Engineers A
    • /
    • v.34 no.7
    • /
    • pp.935-941
    • /
    • 2010

  • 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.

  • https://doi.org/10.3795/KSME-A.2010.34.7.935 인용 PDF KSCI

FLOW CHARACTERISTICS OF A SYSTEM WHICH HAS TWO PARALLEL PUMPS (두 대의 펌프가 병렬로 설치된 장치의 유량 특성)

  • Park, J.G.;Park, J.H.;Park, Y.C.
    • Journal of computational fluids engineering
    • /
    • v.17 no.4
    • /
    • pp.1-8
    • /
    • 2012

  • During a reactor normal operation, two parallel 50% capacity cooling pumps circulate primary coolant to remove the fission reaction heat of the reactor through heat exchangers cold by a cooling tower. When one pump is failure, the other pump shall continuously circulate the coolant to remove the residual heat generated by the fuels loaded in the reactor after reactor shutdown. It is necessary to estimate how much flow rate will be supplied to remove the residual heat. We carried out a flow network analysis for the parallel primary pumps based on the piping network of the primary cooling system in HANARO. As result, it is estimated that the flow rate of one pump increased about 1.33 times the rated flow of one pump and was maintained within the limit of the cavitation critical flow.

  • https://doi.org/10.6112/kscfe.2012.17.4.001 인용 PDF KSCI

The Analysis of Flow Circulation System for HANARO Flow Simulated Test Facility (하나로 유동모의 설비의 유체순환계통 해석)

  • Park, Yong-Chul
    • 유체기계공업학회:학술대회논문집
    • /
    • 2002.12a
    • /
    • pp.419-424
    • /
    • 2002

  • The HANARO, a multi-purpose research reactor of 30 MWth open-tank-in-pool type, has been under normal operation since its initial criticality In February, 1995. Many experiments should be safely performed to activate the utilization of the HANARO. A flow simulation facility is being developed for the endurance test of reactivity control units for extended life times and the verification of structural integrity of those experimental facilities prior to loading in the HANARO. This test facility is composed of three major parts; a half-core structure assembly, flow circulation system and support system. The flow circulation system is composed of a circulation pump, a core flow pipe, a core bypass flow pipe and instruments. The system is to be filled with de-mineralized water and the flow should be met the design flow to simulate similar flow characteristics in the core channel of the half-core test facility to the HANARO. This paper, therefore, describes an analytical analysis to study the flow behavior of the system. The computational flow analysis has been performed for the verification of system pressure variation through the three-dimensional analysis program with standard k-$\epsilon$ turbulence model and for the verification of the structural piping integrity through the finite element method. The results of the analysis are satisfied the design requirements and structural piping integrity of flow circulation system.

  • PDF

Measurements of In-phantom Neutron Flux Distribution at the HANARO BNCT Facility

  • Kim Myong Seop;Park Sang Jun;Jun Byung Jin
    • Nuclear Engineering and Technology
    • /
    • v.36 no.3
    • /
    • pp.203-209
    • /
    • 2004

  • In-phantom neutron flux distribution is measured at the HANARO BNCT irradiation facility. The measurements are performed with Au foil and wires. The thermal neutron flux and Cd ratio obtained at the HANARO BNCT facility are $1.19{\times}10^9\;n/cm^{2}s$ and 152, respectively, at 24 MW reactor power. The measured in-phantom neutron flux has a maximum value at a depth of 3 mm in the phantom and then decreases rapidly. The maximum flux is about $25\%$ larger than that of the phantom surface, and the measured value at a depth of 22 mm in the phantom is about a half of the maximum value. In addition, the neutron beam is limited well within the aperture of the neutron collimator. The two-dimensional in-phantom neutron flux distribution is determined. Significant neutron irradiation is observed within 20 mm from the phantom surface. The measured neutron flux distribution can be utilized in irradiation planning for a patient.

  • PDF KSCI