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KMID : 0371819970290020158
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Nuclear Engineering and Technology
1997 Volume.29 No. 2 p.158 ~ p.166
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Numerical Analysis of Letdown System Performance Test for YGN 3
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Seo, Ho Taek
Sohn, Suk Whun/Seo, Jong Tae/Boo, Jung Sook
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Abstract
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Integrated performance test of Chemical and Volume Control System was successfully performed in 1994. However, an extensive effort to cornett hardware and software problems in the letdown line was required mainly due to the lack of adequate simulation code to predict the test accurately. Although. the. LTC computer code was used during the YGN 3&4 NSSS design process, the code can not satisfactorily predict the test due to its insufficient letdown line modeling. This study developed a numerical model to simulate the letdown test by modifying the current LTC code, and then verified the model by comparing with the test data The comparison shows that the modified LTC computer code can predict the transient behavior of letdown system tests very well. Especially, the model was verified to be able to predict the "Stiction (composition of stick and friction)" phenomena which caused instantaneous fluctuations in the letdown backpressure and flowrate. Therefore, it is oncluded that the modified LTC computer code with the ability of calculating the "Stiction" phenomena will be very useful for future plant design and test predictions.
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