Open AccessNatural Circulation in the Blanket Heat Removal System During a Loss-of-Pumping Accident (LOFA) Based on Initial Conceptual Design
Author(s) -
L.L. Hamm
Publication year - 1998
Language(s) - English
Resource type - Reports
DOI - 10.2172/4895
Subject(s) - blanket , natural circulation , decay heat , natural convection , environmental science , heat exchanger , nuclear engineering , convection , mechanics , materials science , engineering , mechanical engineering , physics , composite material
A transient natural convection model of the APT blanket primary heat removal (HR) system was developed to demonstrate that the blanket could be cooled for a sufficient period of time for long term cooling to be established following a loss-of-flow accident (LOFA). The particular case of interest in this report is a complete loss-of-pumping accident. For the accident scenario in which pumps are lost in both the target and blanket HR systems, natural convection provides effective cooling of the blanket for approximately 68 hours, and, if only the blanket HR systems are involved, natural convection is effective for approximately 210 hours. The heat sink for both of these accident scenarios is the assumed stagnant fluid and metal on the secondary sides of the heat exchangers