What does the leak-before-break concept ensure in piping integrity assessments?

• A. Cracks would reach a detectable leak before a catastrophic break occurs
• B. Cracks would occur only after a catastrophic failure
• C. The pipe would never experience any crack growth
• D. Leaks occur after a major safety margin but not detectable

Answer: (B)

The leak-before-break concept means that if a crack develops in the piping, it would reach a detectable leak before the pipe experiences a catastrophic break. In practice, this provides an early warning: as cracks grow under normal and transient loads, the released fluid from a through-wall crack becomes detectable by sensors or monitoring systems long before the remaining ligament can no longer carry the load. This allows operators to isolate the affected section and repair it before a major rupture occurs. The idea relies on ensuring the crack grows in a controlled way so that the leak rate is above the detection threshold while the structure still has enough toughness to avoid immediate, sudden breakage. If leaks only happened after a catastrophic failure, there would be no timely warning, which is contrary to the safety goal of LBB.