Surveillance of Site A and Plot M

The results of Argonne National Laboratory’s Site A and Plot M environmental monitoring program and the results of the annual site inspection are presented in this publication.

Reference Document

Site A and Plot M 2024 Surveillance Report and 2025 Inspection Report

The cover of Argonne National Laboratory's 2024 Surveillance of Site A and Plot M report. It features an image of the stone historical marker in the ground surrounded by grass with engraved text explaining that it is for where "the world's first nuclear reactor was rebuilt at this site in 1943."

This Site A and Plot M 2024 Surveillance Report and 2025 Inspection Report was prepared by the Environment, Safety and Health, (ESH) Directorate at Argonne National Laboratory (Argonne) for the U.S. Department of Energy Office of Legacy Management (DOE-LM). The results of the Site A and Plot M environmental monitoring program and the results of the annual site inspection are presented in this publication.