Nuclear News Roundup Aug 02, 2016 China continues to sell nuclear reactors to Pakistan, a US think-tank has said, expressing concern over export of nuclear materials in violation of international norms and established procedures. hindustanitimes.com The National Nuclear Security Administration has authorized the B61-12 warhead life-extension program to enter the production-engineering phase. defensenews.com Unit 2 of the Heysham II nuclear power plant on the north west coast of England yesterday broke the world record for the continuous operation of a commercial nuclear power reactor. The reactor is due to be taken offline next month for maintenance. world-nuclear-news.org Japan is raising concerns about North Korea's nuclear warhead miniaturization capabilities. upi.com