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Evaluation of Nuclear Plant Cable Aging Through Condition Monitoring


Extending the lifetime of a nuclear power plant [(hereafter referred to simply as NPP)] is one of the most important concerns in the global nuclear industry. Cables are one of the long-life items that have not been considered for replacement during the design life of a NPP. To extend the cable life beyond the design life, it is first necessary to prove that the design life is too conservative compared with actual aging. Condition monitoring is useful means of evaluating the aging condition of cable. In order to simulate natural aging in a nuclear power plant. a study on accelerated aging must first be conducted. In this paper, evaluations of mechanical aging degradation for a neoprene cable jacket were performed after accelerated aging under tcontinuous and intermittent heating conditions. Contrary to general expectations, intermittent heating to the neoprene cable jacket showed low aging degradation, 50% break-elongation, and 60% indenter modulus, compared with continuous heating. With a plant maintenance period of 1 month after every 12 or 18 months operation, we can easily deduce that the life time of the cable jacket of neoprene can be extended much longer than extimated through the general EQ test. which adopts continuous accelerated aging for determining cable life. Therefore, a systematic approach that considers the actual environment conditions of the nuclear power plant is required for determining cable life.

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참고문헌 (11)

  1. GAZDZINSKI, R.F., DENNY, W.M., TOMAN,G.J. & BUTWIN, R. T., Aging Management Guideline for Commercial Nuclear Power Plant-Electrical Cable and Terminations, Rep. SAND 96-0344, US Dept. Of Energy, Prepared by Sandia National Labs for the US Dept. of Energy, Albuquerque, NM(1996) 
  2. URNAY, D.G.,DAWSON,J., 'Reverse temperature effect during radiation aging of XLPE cable insulation material', (Proc. Of Int. Conf. On Aging Studies and Lifetime Extension of Materials', Oxford, 1999) Kluwer/Plenum Press,London(in press) 
  3. GILLEN, K.T., CLOUGH, R.L., WISE,J., MALONE, G.M., Explanation of enhanced mechanical degradation for radiation-aged polyolefins as the temperature is decrease, Rep. SAND 94-1104C, Sandia National Laboratories, Albuquerque, NM(1994) 
  4. INTERNATIONAL ELECTROTECHNICAL COMMISSION, Guide for the Determination of Thermal Endurance Properties of Electrical Insulating Materials, IEC 216-1 Part 1: General Guidelines for Aging Procedures and Evaluation of Test Results, Geneva, (1990) 
  5. 'Assessment and management of ageing of major nuclear power plant components important to safety', IAEA-TEDOC-1188, IAEA, Austria, December (2000) 
  6. 'Standard Test Method for Decomposition Kinetics by Thermogravimetry', ASTM E1641, (1999) 
  7. 'Test method for rapid thermal degradation of solid electrical insulation materials by thermogravimetric method(TGA)', ASTM 3850, (2000) 
  8. Jong-seog Kim, 'Evaluation of cable life based on condition monitoring', 01 fall meeting of Korean nuclear society, (2001) 
  9. 'Standard test methods for rubber properties in tension', ASTM D412, (1983) 
  10. Jong-seog Kim, 'Development of cable aging indenter', 99 spring meeting of Korean nuclear society, April (1999) 
  11. J.A.BRYDSON, Rubbery Materials and their compounds, ELDEVIER APPLIED SCIENCE, (p 31-32, p 34-35) 

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