Del. Code tit. 15 § 3127
The Department shall, at least 2 weeks prior to the primary election, designate the place for holding a primary election in each primary election district in the same manner as it designates polling places for a general election. The Department may require any individual polling place, that is located in a state facility, public school, or other government owned or operated facility within the county, to be closed to persons other than the voters voting on the day of the primary election if it finds that the polling place cannot or will not provide sufficient access and facilities for the purposes of the primary election without such closure. The Department shall not exercise its authority to close a state facility, public school or other government-owned and operated facility without prior consultation with the authorized representative of such facility and such consultation shall include all reasonable efforts to resolve any access issues that may exist without the need to close such facility.
15 Del. C. § 3127