The Korean Register issued a statement informing of the current situation in all Chinese ports and shipyards amid the coronavirus outbreak; The majority of the ports listed below prohibit any access, while some can be visited by acquiring permission from a local authority.
Shanghai Branch Office
All Shipyard (Newbuilding Ship) + Shipyard (Docking Shipyard) Work: Progress will be delayed due to lack of workers.
Port or Anchorage: As a result of a consultation with the Shanghai Port Authority, even...
https://safety4sea.com/access-concerning-chinese-ports-and-shipyards-update/