Senior military figures have expressed concern that Chinese investment in the new Hinkley Point power station could threaten national security.
The Times has reported that intelligence agencies warned ministers that plans to allow China to take a stake in the Somerset plant could pose a security risk.
But Energy Secretary Amber Rudd said the UK had the strongest level of nuclear regulation worldwide.
Speaking at a Westminster lunch, she said "The Chinese can come and engage with us, but is is our regulations, our high standards that they will have to live up to."
A final investment decision on Hinkley C could be announced during Chinese president Xi Jinping's state visit.