Summary: ELSEVIER Nuclear Engineering and Design 146 (1994) 349-362
Solid breeder thermal transient under purge-line-break accidents
Alice Y. Ying, Mohamed A. Abdou
Mechanical,Aerospace and Nuclear EngineeringDepartment, 43-133 Engineering1~, Universityof California, Los Angeles,
Los Angeles, CA 90024-1597, USA
The breeder thermal performances under a purge line break have been analyzed for two blanket design options: a
blanket design using a packed breeder bed and a blanket design using a sintered breeder product. Under a purge
line break open to a vacuum environment, the packed bed breeder temperature exceeds its operating temperature
limit at a faster rate than that of the sintered breeder blanket design for the same breeder temperature gradient.
Depending on the breeder material and nominal operating conditions, the breeder reaches its maximum operating
temperature in time ranging from 32 seconds to 125 seconds for a break area of 10 cm2 in packed bed designs.
However for the sintered product design, the consequence of this transient might not result in the breeder exceeding
its maximum operating temperature if a reasonable contact pressure could be established at the interface. To reduce
the safety hazards, the tritium concentration build up in the vacuum vessel in conjunction with the purge gas
pressure inside the blanket module should he used as a measure for initiating the reactor shutdown for this type of
accident. The consequence of the purge line break outside the vacuum vessel on the breeder transient thermal