I'm sorry. I'm not quite understanding the question. If the survivor passes away, what happens is that the annuitant will not now recoup into some account the amount that was set aside for the survivor benefit. In other words, they're not going to be made whole for the period of time for which they took a reduced annuity so that they could create the benefit. However, what happens is that their pension then will go back up to 100% of what they would have received had they never created the optional survivor benefit.
I hope that answers the question.