1.   Chirac argues the tests are needed to modernize its nuclear arsenal and develop computer test simulation, while critics say the blasts could encourage others to follow.

2.   France argues the tests are needed to modernize its nuclear arsenal and develop computer test simulation, while critics say the blasts could encourage others to follow suit.

3.   France argues the tests are needed to modernize its nuclear arsenal and develop computer test simulation, while critics say the blasts could encourage others to follow.

4.   But the attack in Atlanta will be a security test simulation.

5.   China and France said they are so far unable to conduct test simulations, in which ultra-fast computers predict the explosion of a nuclear device, but without detonation.

6.   China and France said they were so far unable to conduct test simulations, in which ultra-fast computers predict the explosion of a nuclear device, but without detonation.