ALBUQUERQUE, N.M. (AP) — New Mexico's senators are asking for millions of dollars more to help with recovery efforts at the federal government's only underground nuclear waste repository.

Sens. Tom Udall and Martin Heinrich also want more money for cleanup projects at Los Alamos National Laboratory.

The New Mexico Democrats outlined their nearly $65 million request in a letter sent earlier this month to a Senate appropriations subcommittee.

Most of the request stems from recovery efforts at the Waste Isolation Pilot Plant. The senators cited a backlog of equipment maintenance, repairs and upgrades as well as environmental projects mandated as part of a multimillion settlement with the state of New Mexico.

The repository has been shut down since 2014, when a drum of inappropriately packed waste from Los Alamos resulted in a radiation release.