An internal inspection shows a deliberately flawed shuttle booster test-fired last week in Utah suffered no major damage, giving NASA confidence new O-ring joints will work despite major failures, officials said Friday.

The test-firing was a major milestone on the road to resuming shuttle flights, with NASA hoping to launch Discovery on the first post-Challenger mission in the last week of September.NASA officials said earlier in the week they had hoped to name a launch date by the end of this week.