Transbay transit center officials still aren’t saying when they’ll reopen the $2.2 billion transit hub — closed for eight months by fractured girders and seemingly endless inspections — but they’re rehiring workers, making sure the elevators, escalators and signs are functioning, and cleaning up.

While no reopening date has been scheduled, the activity is a sign that buses — and people — could flow into the three-block-long bus station, retail center and rooftop park again, possibly by the end of June.

Engineers for the Transbay Joint Powers Authority, an independent peer review committee and a group of consultants met May 22 and 23 in New York City to determine whether all the needed repairs, inspections and reviews have been completed and whether the center is ready to reopen.

The answer: almost. Michael Engelhardt, a structural engineering professor at the University of Texas, Austin, heads the review panel assembled by the Metropolitan Transportation Commission at the request of San Francisco Mayor London Breed and Oakland Mayor Libby Schaaf.

“We think this could be wrapped up pretty quickly,” he said last week. “Possibly in a week or two. We’re not talking about months of study.”

When the center reopens is up to the Transbay Joint Powers Authority, which operates the building and oversaw its construction. But spokeswoman Christine Falvey said the agency wants the go-ahead from the review committee.

“We are eager to receive their final conclusions and will release a reopening date when we receive word that they are fully satisfied with all of our efforts to reopen the center,” she said.

Engelhardt said the conclusion of the New York meeting was that engineers need to open up the walls or ceilings in a few locations to examine a combination of welds to ensure that they were done correctly.

If the welds check out, the committee will prepare a letter to the MTC saying the engineers have reviewed the repairs of the fractured girders and inspections of the rest of the center and consider the center safe to reopen. Should they find faulty welds, all bets are off.

But Engelhardt said he is optimistic. So far, inspections of drawings and welds have found no problems, he said.

“It’s been a long ride, and I think we’re coming close to the end,” he said.

Michael Cabanatuan is a San Francisco Chronicle staff writer. Email: mcabanatuan@sfchronicle.com Twitter: @ctuan