Requests to use NERSC resources are submitted annually via a web form known as the ERCAP (Energy Research Computing Allocations Process) Request Form. ERCAP is accessed through the NERSC Information Management (NIM) web interface and is available year-round.
If you are new to NERSC and want to apply for an allocation as a new Principal Investigator please read Applying for your First NERSC Allocation.
In general existing projects should be renewed for the next allocation year - you should not start a new request if you have an existing repository. Renewing carries forward most of the responses to the request questions and preserves the project's user list.