压水堆核电厂的设计基准事故定义为主管道双端断裂,这一假设过于保守.管道的失效方式往往是先出现破口而后再泄漏,即所谓的先漏后破(Leak Before Break,简称LBB),而不是双端断裂.LBB准则是防止核电厂压力管道发生灾难性破裂事故的重要...压水堆核电厂的设计基准事故定义为主管道双端断裂,这一假设过于保守.管道的失效方式往往是先出现破口而后再泄漏,即所谓的先漏后破(Leak Before Break,简称LBB),而不是双端断裂.LBB准则是防止核电厂压力管道发生灾难性破裂事故的重要评定准则.本文介绍了LBB评定技术在国外的发展情况和意义,阐述了LBB在AP1000核电厂中的应用情况及LBB评价的理论基础.展开更多
A series of tests were completed for three types of loss of coolant accidents (LOCAs) (pipe break in the gas plenum. near the liquid level and submerged under water) in the test nuclear heating reactor (NHR). Experime...A series of tests were completed for three types of loss of coolant accidents (LOCAs) (pipe break in the gas plenum. near the liquid level and submerged under water) in the test nuclear heating reactor (NHR). Experiments show that the three cases of LOCAs (loss of coolant accidents) have different patterns. In the case of a pipe break connected to the gas plenum, the quantity of water lost is independent of the diameter of the broken pipe. In the case of a pipe located near the liquid level. the quantity of water lost depends on the location of the pipe. In the case of a pipe break below the water level. all the water above the break will be discharged. The discharge patterns for all three cases are analyzed in detail.展开更多
文摘压水堆核电厂的设计基准事故定义为主管道双端断裂,这一假设过于保守.管道的失效方式往往是先出现破口而后再泄漏,即所谓的先漏后破(Leak Before Break,简称LBB),而不是双端断裂.LBB准则是防止核电厂压力管道发生灾难性破裂事故的重要评定准则.本文介绍了LBB评定技术在国外的发展情况和意义,阐述了LBB在AP1000核电厂中的应用情况及LBB评价的理论基础.
文摘A series of tests were completed for three types of loss of coolant accidents (LOCAs) (pipe break in the gas plenum. near the liquid level and submerged under water) in the test nuclear heating reactor (NHR). Experiments show that the three cases of LOCAs (loss of coolant accidents) have different patterns. In the case of a pipe break connected to the gas plenum, the quantity of water lost is independent of the diameter of the broken pipe. In the case of a pipe located near the liquid level. the quantity of water lost depends on the location of the pipe. In the case of a pipe break below the water level. all the water above the break will be discharged. The discharge patterns for all three cases are analyzed in detail.
