WASHINGTON — A confidential survey of workers on the Deepwater Horizon in the weeks before the oil rig exploded showed that many of them were concerned about safety practices and feared reprisals if they reported mistakes or other problems.

In the survey, commissioned by the rig’s owner, Transocean, workers said that company plans were not carried out properly and that they “often saw unsafe behaviors on the rig.”

According to a separate 112-page equipment assessment also commissioned by Transocean, many key components — including the blowout preventer rams and failsafe valves — had not been fully inspected since 2000, even though guidelines require its inspection every three to five years.

The report cited at least 26 components and systems on the rig that were in “bad” or “poor” condition.