Sections of ASME B&PV Code Applicable to Type B Packages
Component FunctionCategory ICategory IICategory III
ContainmentSection III, Division 1, Subsection NB
or
Section III, Division 3
Section III, Division 1, Subsection ND
*
Section III, Division 1, Subsection NF
**
See "Err:" below
Criticality (structural support) Section III, Division 1, Subsection NG (NF for Buckling)
Shielding and Other Safety Items Section VIII, Division 1   or   Section III, Division 1, Subsection NF
* Category I criteria are also acceptable.
** Category I or II criteria are also acceptable.
Err: Sec. III NF is a typo. It should read Section VIII, Division 1.

This table is taken from the DOE "Packaging Review Guide for Reviewing Safety Analysis Reports for Packagings" which can be downloaded from DOE's "RAMPAC" site (see References)