Built-in root, surface breaking, flaws?

Выражение встречается в следующем контексте:
The Proposal
The proposal covers all activities from the receipt of representative materials from Company, through to the delivery of the final report on the Full-Scale test.
The activities include:
• Receipt of materials
• Mechanical testing of base materials
• Proposed test layout
• Welding requirements
• Built-in root, surface breaking, flaws
• Stress analysis
• Full-scale testing
• Test environment
• Standard NACE testing of small-scale SSCC specimens
• Test procedure
• Post test examination
• Instrumentation for pressure, temperature, gas sampling
• Safety
• Quality assurance
• Assumptions

Заранее спасибо