---
kind: "section"
citation: "10 C.F.R. § 71.51"
title: "10"
number: "71.51"
heading: "Additional requirements for Type B packages."
url: "https://uscodex.org/cfr/10/71.51"
---

# §71.51. Additional requirements for Type B packages.

- (a) A Type B package, in addition to satisfying the requirements of [§§ 71.41 through 71.47](/cfr/10/71.41..71.47.md), must be designed, constructed, and prepared for shipment so that under the tests specified in:
  - (1) [Section 71.71](/cfr/10/71.71.md) (“Normal conditions of transport”), there would be no loss or dispersal of radioactive contents—as demonstrated to a sensitivity of 10−6 A2 per hour, no significant increase in external surface radiation levels, and no substantial reduction in the effectiveness of the packaging; and
  - (2) [Section 71.73](/cfr/10/71.73.md) (“Hypothetical accident conditions”), there would be no escape of krypton-85 exceeding 10 A2 in 1 week, no escape of other radioactive material exceeding a total amount A2 in 1 week, and no external radiation dose rate exceeding 10 mSv/h (1 rem/h) at 1 m (40 in) from the external surface of the package.
- (b) Where mixtures of different radionuclides are present, the provisions of appendix A, paragraph IV of this part shall apply, except that for Krypton-85, an effective A2 value equal to 10 A2 may be used.
- (c) Compliance with the permitted activity release limits of [paragraph (a)](#a) of this section may not depend on filters or on a mechanical cooling system.
- (d) For packages which contain radioactive contents with activity greater than 10 5 A2, the requirements of [§ 71.61](/cfr/10/71.61.md) must be met.

## Notes

### Amendments

[60 FR 50264, Sept. 28, 1995, as amended at 69 FR 3794, Jan. 26, 2004; 69 FR 58039, Sept. 29, 2004]

### Authority

Authority: Atomic Energy Act of 1954, secs. 53, 57, 62, 63, 81, 161, 182, 183, 223, 234, 1701 (42 U.S.C. 2073, 2077, 2092, 2093, 2111, 2201, 2232, 2233, 2273, 2282, 2297f); Energy Reorganization Act of 1974, secs. 201, 202, 206, 211 (42 U.S.C. 5841, 5842, 5846, 5851); Nuclear Waste Policy Act of 1982, sec. 180 (42 U.S.C. 10175); 44 U.S.C. 3504 note. Section 71.97 also issued under Sec. 301, Pub. L. 96-295, 94 Stat. 789 (42 U.S.C. 5841 note).

### Source

Source: 60 FR 50264, Sept. 28, 1995, unless otherwise noted.

### Amendments

[60 FR 50264, Sept. 28, 1995, as amended at 69 FR 3794, Jan. 26, 2004; 69 FR 58039, Sept. 29, 2004]