Unite union members had warned of strikes over bonus pay, but it has now been agreed that interim bonuses will be paid out until the end of August.
A long-term settlement will also be considered by union officials and EDF Energy, which is behind the scheme.
Hinkley Point C is expected to be operational in 2025.
Unite officer, Jerry Swain, said the interim agreement was "crucial" in providing a "breathing space" and "creating the opportunity for a long-term solution".
"I am pleased that following consultation with our stewards and members that we have been able to agree a clear path forward," he said.
"And that the prospect of industrial action, which is always a last resort, can be taken off the agenda in order to allow the panel to deliberate."
Nigel Cann, of EDF, said it has created a "very competitive reward structure" for its workforce.
"We are pleased that these interim arrangements allow constructive dialogue to continue to finalise this important agreement," he said.
"Unite has been a constructive partner in the discussions to date and I look forward to this continuing throughout the construction of the Hinkley Point C power station."

An average 8.1 million people tuned in to watch the TV talent search as it was broadcast, compared with an average 4.5 million who watched The Voice.
Viewing peaked at 9.6 million on ITV as 13-year-old Beau Dermott wowed the judges with her singing.
Some 6.1 million saw Kevin Simm crowned the winner of the BBC's singing show.
Despite winning the ratings battle on Saturday, the Britain's Got Talent opener received the lowest viewing figures of any launch show since its very first episode in 2007 when 4.9 million people tuned in.
Last year 10.1 million watched the launch, down from a high of 11.1 million in 2014.
Saturday's episode saw Dermott secure a standing ovation and the first Golden Buzzer from the judges - which gives her an automatic place in the live shows - following her rendition of Defying Gravity from the musical Wicked.
After a slight fall in viewership for the following acts, audiences peaked again as 9.5 million watched Moldovan Alexandr Magala's sword swallowing act.
The judges and crowd screamed and covered their eyes as the 26-year-old slid upside-down a pole with the sword lodged in his mouth, coming to a stop an inch above the ground.
"I actually thought you were going to die," Simon Cowell admitted after the act was put through to the next round of the competition.
According to overnight figures, around 40% of all TV audiences were watching Britain's Got Talent between 19:00 BST and 20:20 BST.
When the programme finished, two million viewers switched over to The Voice for its final 40 minutes and to see the winner announced.
Simm, who was previously in the pop group Liberty X, beat runner-up Jolan to be crowned the last winner of the singing contest on BBC One before the show moves to ITV.
Although audience figures for the latest series of The Voice had started strongly with an average 7.9 million viewers, ratings steadily declined in past weeks with 4.5 million tuning into the semi-final last week.
The finale drew its lowest ever ratings, down from 6.3 million viewers who tuned in to watch it last year, and 6.6 million in 2014.
The threat of industrial action by workers building the Hinkley Point nuclear power station has been averted due to an interim pay deal.
[NEXT_CONCEPT]
The return of Britain's Got Talent was a ratings winner for ITV, scoring almost double the viewers as the final of The Voice on BBC One.