Still working — heavy queries on the fallback index can run 20-40 seconds.
C.F.R.
»
Title 10
» CHAPTER I—NUCLEAR REGULATORY COMMISSION › PART 71—PACKAGING AND TRANSPORTATION OF RADIOACTIVE MATERIAL › Subpart E—Package Approval Standards
10 C.F.R. § 71.61
Special requirements for Type B packages containing more than 105A2
A Type B package containing more than 10
5A2 must be designed so that its undamaged containment system can withstand an external water pressure of 2 MPa (290 psi) for a period of not less than 1 hour without collapse, buckling, or inleakage of water.