What would happen to Shinano after a Japanese surrender?

What if Shinano survived the war and reached Tokyo Bay for the surrender?

She would probably have been expended in American postwar weapons testing rather than preserved, likely becoming a radioactive artificial reef.

In this counterfactual, reaching Tokyo Bay for the surrender would probably lead to Shinano's destruction in American nuclear weapons tests. Her expected fate is a radioactive wreck near a Pacific atoll. Preserving a Japanese battleship hull converted into a forward aviation support ship would have offered an unusual museum exhibit. That is a personal preference expressed alongside the prediction of destructive testing.