Development of Ceramic Humidity Sensor for the Korean Next Generation Reactor

  • Published : 1998.10.01

Abstract

Leak-before-break(LBB) approach has been shown to be both cost effective and risk reductive when applied to high energy Piping in nuclear Power Plants. For the Korean Next Generation Reactor (KNGR) development, LBB application is considered for the Main Steam Line(MSL) piping inside containment. Unlike the primary system leakages, the MSL leak detection systems must be based on principles other than radioactivity measurements. Among humidity, heat and acoustic noise currently being considered as indicators of leakage, we explored humidity as an effective one and developed ceramic-based humidity sensor which can be qualified for LBB applications. The ceramic material, sintered and annealed MgCr$_2$O$_4$-TiO$_2$, is shown to increase its electrical conductivity drastically upon water vapor adsorption over the entire temperature range of interest. With this ceramic sensor specimen, we suggested installation-inside-the-piping method by which we can detect leakage more rapidly and sensitively. In this paper, we describe the progress in the development and characterization of ceramic humidity sensor for the LBB application to the MSL of KNGR.

Keywords

References

  1. Applicability of Leak-Before-Break to the Young Gwang 3&4 Main Coolant Loop & Surge Line Combustion Engineering, Inc
  2. Standard Review Plan 3.6.3., Draft Leak-Before-Break Evaluation Procedures U.S. N.R.C.
  3. Electrical Conductivity in Ceramics and Glass N. M. Tallan
  4. M. S. Thesis, Division of Materials Science and Engineering, Seoul National University J. H. Park
  5. Proceedings on Specialist meeting on Leak Before Break in Reactor Piping and Vessels, EDF - FRAMATOME - CEA - EC DGXI Nuclear Eletric -OECD - IAEA - NRC - SFEN LYON
  6. Kansai Electric Power Cooperation R&D Center, Japan, Comprehensive research summary No. 82-017 Development of Portable trace steam leak detection instrument K. Nii;M. Kuwabara;F. Odahara;Y. Ise;O. Kawasaki
  7. EPRI NP-5010 Application of Leak-Before-Break Analysis to PWR Piping Designed by Combustion Engineering D.J Ayres;J.J. LaRussa;B.R. Ganta;S.C. Austin
  8. J. Phys. Chem. v.72 no.10 The electrical conductivity of Silica Gel in the Presence of Adsorbed Water J. H. Anderson;G. A. Parks
  9. NUREG-1061 v.3 Evaluation of Potential for Pipe Breaks U.S. N.R.C.
  10. J. Am. Ceram. Soc. v.73 no.7 Electrical Properties of TiO₂-K₂$Ti_6$$O_13$ Porous Ceramic Humidity Sensor Y-C Yeh;T-Y Tseng;D-A Chang
  11. Materials Chemistry and physics v.46 Mechanism of humidity sensing of Ti-doped MgCr₂O₄ ceramics S. S. Pingale;S. F. Patil;M. P. Vinod;G. Pathak;K. Vijayamohanan
  12. Nuclear Engineering International Detecting and locating the smallest leaks early P. Jax
  13. EPRI Report NP-3596-SR, Rev. 1 PICEP : Pipe Crack Evaluation Program D. M. Norris;B. Chexal
  14. Physical Chemistry(4th Edition) Walter J. Moore
  15. Regulatory Guide 1. 45, Rev.1 Reactor Coolant Pressure Boundary Leakage Detection Systems U.S. N.R.C.
  16. J. Am. Ceram. Soc. v.63 no.5;6 Humidity-sensitive Electrical Conduction MgCr₂O₄-TiO₂Porous Ceramics T. Nitta;Z. Terada;S. Hayakawa
  17. J. Phys. Chem. v.73 The relation between the amounts of chemisorbed and physisorbed water on metal oxides T. Morimoto;M. Nagao;F. Tokuda
  18. Sensors and Actuators, B Ceramic sensor device materials T. Nenov;S. Yordanov