From the Document: "The NRC [Nuclear Regulatory Commission] is issuing this information notice to provide information that was transmitted to the NRC by the Information Security Oversight Office (ISOO) of the National Archives and Records Administration. [...] The NRC was informed by ISOO that through the course of the ongoing investigation into the intrusion affecting the U.S. Office of Personnel Management's (OPM) systems, it was recently discovered that additional systems were compromised. These systems included those that contain information related to the background investigations of current, former, and prospective Federal government employees, as well as other individuals for whom a Federal background investigation was conducted."
NRC Information Notice 2015-06: ISOO Notice 2015-02; Nuclear Regulatory Commission Information Notice 2015-06: Information Security Oversight Office Notice 2015-02
Federal Depository Library Program Electronic Collection Archive: https://permanent.fdlp.gov/