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KMID : 0371820000320010001
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Nuclear Engineering and Technology
2000 Volume.32 No. 1 p.1 ~ p.9
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DHC Characteristics of M11 Pressure Tube in Wolsong Unit 1
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Sungsoo Kim
Youngsuk Kim
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Abstract
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Delayed hydride cracking (DHC) velocity and threshold stress intensity factor for DHC (KIH) tests in the radial direction on M11 pressure tube material in Wolsong unit 1 were carried out following the Atomic Energy Canada Limited (AECL) standard test procedure in order to identify the effect of undercooling on DHCV and to acquire the KIH data. The results showed that KIH 's were 8.8±0.8 MPa√m in the back offcut and 11.4±0.7 MPa√m in the front offcut. The fact that KIH in the front offcut is about 20% higher than that in the back offcut is attributed to the microstructural difference between the materials of the front and back ends. KIH 's in M11 pressure tube appeared to be higher than the values from the tubes made of double melted ingot reported earlier. This can be interpreted by the fact that very small amounts of Chlorine (Cl) and Phosphorus (P) are contained in the ingot and that the content of the harmful elements in the M11 pressure tube is equivalent to that made of a quadruple melting process. DHC velocities at 250?C in the front offcut in the radial direction are measured to be 5~8×10?8 m/s. The results show that the prior thermal history change the DHC velocity significantly. This effect was confirmed by the experiment of undercooling prior to the DHC tests.DHC tests.
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