کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
8067611 1521103 2016 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
An evaluation of thermowell's integrity in RCP test facility
موضوعات مرتبط
مهندسی و علوم پایه مهندسی انرژی مهندسی انرژی و فناوری های برق
پیش نمایش صفحه اول مقاله
An evaluation of thermowell's integrity in RCP test facility
چکیده انگلیسی
An RCP test facility has been constructed at KAERI. During the commissioning startup operation, one of thermowells was cracked due to the high-speed coolant velocity. To complete the startup operation, a modified design of the thermowells was proposed, and all the original thermowells were replaced by the modified ones. From an evaluation of the original and modified designs of the thermowells according to the recent PTC code, the original design did not satisfy the new or old requirements, and the modified design simply satisfied the old requirement. The cracked surface of the original one was owing to the fatigue stresses in transverse oscillations. Two of three modified thermowells were found to be bent after about a 4.1 × 108 fatigue cycle operation. Their tapered-shanks came in contact with the nozzle walls and each showed a rim of deformation on the root. The modified ones suffered the fatigue stresses in in-line oscillations and became bent in in-line direction. A new design of thermowells with a straight shape and shorter unsupported length satisfying the current PTC code requirement was developed and installed in the RCP test facility. For the new design, additional modal analysis based on the finite element method was performed to check the dynamic behaviors using the ANSYS code and it was found that the PTC code predicted more conservative frequencies for the evaluation of dynamic behaviors in thermowell design.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Annals of Nuclear Energy - Volume 94, August 2016, Pages 55-61
نویسندگان
, , , , , , , , ,