# 2026-22473: DOE Draws a New Security Line Around a California Physics Lab

2026-22473, Notice of 229 Boundary for the SLAC National Accelerator Laboratory, is a Federal Register notice from Energy Department published 2026-11-04, effective 2026-11-04 (as of 2026-11-04).

- Canonical: https://policyrisk.com/federal-register/2026-22473
- As of: 2026-11-04
- Plain-text twin of the page above; the HTML and this file carry the same facts.

## Facts
- Document number: 2026-22473
- Title: Notice of 229 Boundary for the SLAC National Accelerator Laboratory
- Type: Notice
- Agencies: Energy Department
- Citation: 91 FR 69553
- Published: 2026-11-04
- Effective: 2026-11-04
- Comments close: not stated
- Significant: no
- Touches household money: no
- Regulation identifier numbers: none
- Last updated: 2026-11-04

## In one line

DOE Draws a New Security Line Around a California Physics Lab

## Summary

The Department of Energy has officially set clear security boundaries around the SLAC National Accelerator Laboratory in Menlo Park, California, starting November 4, 2026. This means no unauthorized people or dangerous items can enter the 426-acre site, which is managed with Stanford University. If you work there or visit, expect new signs and fences to keep everyone safe and secure.

## Abstract

Notice is hereby given that the U.S. Department of Energy, pursuant to the Atomic Energy Act of 1954, prohibits the unauthorized entry and the unauthorized introduction of weapons or dangerous materials, as provided in, into or upon the following described facilities and property of the SLAC National Accelerator Laboratory of the U.S. Department of Energy.

## Effects PRIA read

- Unauthorized Entry and Weapons Prohibited: benefit, low. Starting November 4, 2026, the Department of Energy prohibits unauthorized entry and the unauthorized introduction of weapons or dangerous materials onto the SLAC National Accelerator Laboratory property. The restriction applies to the SLAC site in Menlo Park, California, which consists of approxim…
- Perimeter Marked by Signs and Fencing: benefit, low. The SLAC boundary will be marked by signage at entrances and along the perimeter, chain link fencing, and other physical features surrounding the 426.3-acre site. If you work at or visit the site, you will see these signs and fences indicating the secured boundary.

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## Sources
- [2026-22473 on federalregister.gov](https://www.federalregister.gov/documents/2026/11/04/2026-22473/notice-of-229-boundary-for-the-slac-national-accelerator-laboratory)
- [2026-22473 as published (PDF)](https://www.govinfo.gov/content/pkg/FR-2026-11-04/pdf/2026-22473.pdf)

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Source: PRIA, https://policyrisk.com/federal-register/2026-22473 (as of 2026-11-04).