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Iodine Stress Corrosion Cracking of Zircaloy-4 Tubes

¿øÀÚ·ÂÇÐȸÁö 1978³â 10±Ç 2È£ p.65 ~ 72
Moon Kyung-Jin, À̺´È£,
¼Ò¼Ó »ó¼¼Á¤º¸
 ( Moon Kyung-Jin ) 
KAIS

À̺´È£ ( Lee Byung-Ho ) 
KAIS

Abstract

¿øÀÚ·Î °¡µ¿½Ã, Á¤»ó»óÅ¿¡¼­ ¹þ¾î³ª °©ÀÛ½º·´°Ô Ãâ·ÂÀÌ ¹Ù²ð ¶§ ¹ß»ýÇÏ´Â ÀÀ·ÂÀÇ ÁýÁß°ú ÇÙ ºÐ¿­½Ã ¹ß»ýÇÏ´Â ¿ä¿ÀµåÀÇ ºÎ½Ä¿¡ ÀÇÇØ¼­ »ý±â´Â ÇǺ¹¹°ÁúÀÇ ÀÀ·ÂºÎ½ÄÆÄ±«Çö»óÀ» ÀÌÇØÇϱâ À§ÇÏ¿©, À̹ø ½ÇÇè¿¡¼­´Â Áö¸£Ä®·ÎÀÌ-4(Zircaloy-4)°üÀ» »ç¿ëÇÏ¿© ¿ä¿ÀµåÀÀ·ÂºÎ½Ä ½ÇÇèÀ» ¿øÀÚ·Î ¾ÈÀÇ »óÅ¿¡ °¡±õµµ·Ï 300¡ÉÀÇ »óžƷ¡¼­ ÇàÇÏ¿´´Ù.
¿ä¿Àµå ³óµµ¿¡ µû¶ó¼­ Áö¸£Ä®·ÎÀÌ-4, °ü(Tube)ÀÇ ÀÀ·ÂºÎ½Ä¿¡ ÇÑ ÆÄ±«½Ã°£À» ±¸Çß°í, ÀÀ·ÂºÎ½ÄÀ» ÀÏÀ¸Å³ ¼ö ÀÖ´Â ÀÓ°è¿ä¿Àµå ³óµµ ¹× ÀÓ°èÁ¢¼±¹æÇâÀÇ ÀÀ·ÂÀ» ±¸ÇÏ¿´´Ù.
¿ë¿Àµå¿¡ ÀÇÇÑ ÀÀ·ÂºÎ½ÄÀÌ È­ÇÐÀûÀÎ ¹ÝÀÀÀ̶ó±â º¸´Ù´Â ±â°èÀûÀÎ ¹ÝÀÀ¼º°ÝÀ» °®±â ¶§¹®¿¡ ÀÀ·ÂºÎ½ÄÀ» ÆÄ±«¿ªÇÐÀûÀÎ °üÁ¡¿¡¼­ ¼³¸íÇϰíÀÚ ÀÀ·Â°ú ÆÄ±«½Ã°£À» ÇÔ¼ö °ü°è·Î ´ÙÀ½°ú °°ÀÌ Á¶»çÇØ º¸¾Ò´Ù.
log t_(F)=5.5-(3/2)log c-4 log ¥ò
t_(F): ÆÄ±«½Ã°£
c: ¿ä¿Àµå³óµµ(§·/§¨)
¥ò: ÀÀ·Â(10^(4)psi)
In this paper, it is attempted to investigate the phenomena of iodine stress corrosion cracking of Zircaloy-4 cladding failures in reactor through the results of similar out-of-pile test in iodine vapour.
The main result of this experiment is a finding of the relation between the threshold stress which can lead to iodine stress corrosion cracking of Zircaloy-4 tube and the iodine concentration. The values of critical stress and the critical iodine concentration are also obtained.
A model which relates failure time of Zircaley-4 tube to failure stress and iodine concentration is suggested as follows:
log tF=5.5-(3/2)log c-4 log ¥ò
where tF: failure time, minutes
c: iodne concentration, §·/§¨
¥ò: stress, 104psi

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