TY - JOUR
T1 - Thermal fatigue analysis in a high pressure cooling system (HPCS) nozzle of a boling water reactor
AU - Hernández-Gómez, Luis Héctor
AU - Pérez-Escobar, Brayan Leonardo
AU - Beltrán-Fernández, Juan Alfonso
AU - Flores-Campos, Juan Alejandro
AU - Pérez-Montejo, Salatiel
AU - Jiménez-Santiago, Krisselby Ivonne
AU - Ruíz-Lopez, Pablo
AU - Urriolagoitia-Calderón, Guillermo Manuel
PY - 2017
Y1 - 2017
N2 - In this paper, the Cumulative Usage Factor (CUF) of a High Pressure Core Cooling System (HPCS) reactor nozzle of a Boiling Water Reactor was calculated. This fatigue damage has been caused by the sudden injection of cold water into the reactor vessel through such nozzle. For this purpose, a three-dimensional analysis was carried out. Accordingly, a transient heat transfer analysis was developed. The temperature distribution was determined. With this information, the stress analysis was carried out. The safe end was restricted to move along its axial direction and the forging end was free to expand axially and radially. The resultant stress field established the magnitude of the alternative stresses. In the last step, a fatigue analysis was developed. The most critical point is the junction of the nozzle with the thermal sleeve. The fatigue performance was evaluated during a period of sixty years. It was assumed that 1.5 cycles per year will take place. The fatigue curves of ASME code section III were used. The results showed that the Cumulative Usage Factor (CUF) vary with the temperature injection, being 0.4090 when the water injected was 4.44°C and 0.3797 when the water temperature was 37.77°C. Both of them were estimated for a period of 60 years of operation. Therefore, damage is reduced as the temperature of the injected water increases. Besides, it is advisable to at least follow the recommendations of the NUREG's 1800 and 1801 [1, 2]. In this way, the aging of the nozzle is adequately managed.
AB - In this paper, the Cumulative Usage Factor (CUF) of a High Pressure Core Cooling System (HPCS) reactor nozzle of a Boiling Water Reactor was calculated. This fatigue damage has been caused by the sudden injection of cold water into the reactor vessel through such nozzle. For this purpose, a three-dimensional analysis was carried out. Accordingly, a transient heat transfer analysis was developed. The temperature distribution was determined. With this information, the stress analysis was carried out. The safe end was restricted to move along its axial direction and the forging end was free to expand axially and radially. The resultant stress field established the magnitude of the alternative stresses. In the last step, a fatigue analysis was developed. The most critical point is the junction of the nozzle with the thermal sleeve. The fatigue performance was evaluated during a period of sixty years. It was assumed that 1.5 cycles per year will take place. The fatigue curves of ASME code section III were used. The results showed that the Cumulative Usage Factor (CUF) vary with the temperature injection, being 0.4090 when the water injected was 4.44°C and 0.3797 when the water temperature was 37.77°C. Both of them were estimated for a period of 60 years of operation. Therefore, damage is reduced as the temperature of the injected water increases. Besides, it is advisable to at least follow the recommendations of the NUREG's 1800 and 1801 [1, 2]. In this way, the aging of the nozzle is adequately managed.
KW - Aging
KW - Cooling System
KW - Cumulative Usage Factor
KW - Nozzle
UR - http://www.scopus.com/inward/record.url?scp=85011017748&partnerID=8YFLogxK
U2 - 10.4028/www.scientific.net/DDF.370.162
DO - 10.4028/www.scientific.net/DDF.370.162
M3 - Artículo
SN - 1012-0386
VL - 370
SP - 162
EP - 170
JO - Defect and Diffusion Forum
JF - Defect and Diffusion Forum
ER -