At this time requests to download MACCS, WinMACCS, SecPOP, or MelMACCS can be made from http://www.nrc.gov/about-nrc/regulatory/research/obtainingcodes.html. This will take you to a Nuclear Regulatory Commission's (NRC) webpage which provides additional detail on obtaining MACCS, WinMACCS, SecPOP, MELMACCS, and other NRC-Developed Computer Codes. Scroll down to the MELCOR/MACCS heading and click on the non-disclosure agreement (NDA) link. This will open a NDA form which must be filled out before you can download the codes. Select the code you wish to obtain from the drop-down menu on the form and complete and fax/email the form to 301-251-7423 or
firstname.lastname@example.org. A fee may be necessary to obtain the code depending on what type of organization is requesting the code. Once the NRC obtains and approved the NDA they will send you a Login ID and Password. Once obtaining the Login ID and Password, go to the MELCOR download website (https://melcor.sandia.gov/md4/). Enter your assigned Login ID and Password and follow all subsequent steps to download the code.