First of all, I take it you are "reinstating" (not revalidating) your CFI because more than 2 years has gone by. Don't let this happen again.
There's not much about CFI certs on the TSA web site. Since you are not adding to your skill set, I'd say no clearance is required. Lots of contact info on the AOPA web site (search TSA on the AOPA site.)