10 CFR § 9.301 - Social Security account numbers in documents sent by mail.

---
identifier: "/us/cfr/t10/s9.301"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "10 CFR § 9.301 - Social Security account numbers in documents sent by mail."
title_number: 10
title_name: "Energy"
section_number: "9.301"
section_name: "Social Security account numbers in documents sent by mail."
chapter_name: "NUCLEAR REGULATORY COMMISSION"
part_number: "9"
part_name: "PUBLIC RECORDS"
positive_law: false
currency: "2026-03-24"
last_updated: "2026-03-24"
format_version: "1.1.0"
generator: "[email protected]"
authority: "Atomic Energy Act of 1954, sec. 161 (42 U.S.C. 2201); Energy Reorganization Act of 1974, sec. 201 (42 U.S.C. 5841); 44 U.S.C. 3504 note."
cfr_part: "9"
---


# 9.301 Social Security account numbers in documents sent by mail.

(a) Social Security account numbers shall not be visible on the outside of any package sent by mail.

(b) A document sent by mail may only include the Social Security account number of an individual if it is determined by the head of the agency that the inclusion of a Social Security account number is necessary.

(c) The inclusion of a Social Security account number of an individual on a document sent by mail is necessary when—

(1) Required by law; or

(2) Necessary to identify a specific individual and no adequate substitute is available.

(d) Social Security account numbers must be partially redacted in documents sent by mail whenever feasible.