DOE/NNSA Clearance Action Tracking System (CATS) Development & Maintenance Support Services.

Amendment #4 incorporates the following revised attachments L-1, L-3, L-7 L-8, and L-11; and revises the cover letter stating questions will no longer be accepted and any proposal, modification, or revision, that is received after the exact time specified for receipt of proposals is "late" and will not be considered.

Amendment #3 extends the proposal due date to August 28, 2025; Revises CLINs 00001, 00002, 02001, and 03002 Incorporates the following revised attachments: L-1, L-2, L-3, L-7, and M-1; Incorporates attachment L-11 Questions and Answers and Removes attachment L-6 in its entirety.

Amendment #2 extends the questions or concerns submissions from July 23, 2025 to August 7, 2025 and extends the proposal due date to August 22, 2025. This extension is due to a system error that did not release the original solicitation in SAM.gov and will therefore allow prospective offerors with access to SAM.gov the same allotment of time to review the RFP, submit timely questions, and development of its respective offer as those that have accessed the RFP through FedConnect.

Amendment #1 uploading attachment M-1 Section M Provisions to the solicitation. Request for Proposal No. 89233125RNA000262, the U.S. Department of Energy (DOE), National Nuclear Security Administration (NNSA) Contracting Operations Division is hereby issuing the attached Request for Proposal (RFP) for the Clearance Action Tracking System (CATS) Development & Maintenance acquisition.