Meridian Primary School in Peacehaven has been classed as inadequate by an education watchdog and placed into special measures.
Ofsted criticised the school in Roderick Avenue North for underachievement and low standards.
The school said it was confident the issues could be fixed quickly and that it had some strengths.
A county council spokesperson said: “We are obviously very disappointed with the outcome of the Ofsted inspection, which raises a number of issues about the performance of the school which need addressing urgently.
“Applying to the Secretary of State to appoint an interim executive board (IEB) is not uncommon in cases where schools are placed in special measures and is a proven way of securing rapid improvement in outcomes for pupils.
“Children don’t get a second chance to have an education and therefore it’s vital that we have in place a governing body with the experience and skills required to turn the school around as quickly as possible.”
Headteacher Claire Westcott said: “We’re obviously disappointed to be in special measures but we’re confident the issues highlighted in the report can and will be rapidly put right so all our pupils get the best possible education.
“We’ve already done a lot of work which is starting to raise standards and during the inspection good and outstanding teaching was observed.
“We’re building on our strengths so we can provide high quality learning across the school.”
Peacehaven MP Simon Kirby said he was concerned the council had asked the Secretary of State for Education to appoint an Interim Executive Board and dismiss the largely new board of Governors, appealing for them to have time to address problems.