Wales have confirmed they will play all four of their autumn home games – including the November 28 meeting with England – in Llanelli.
The Principality Stadium remains out of action as it has been used as a field hospital in the battle against the Covid-19 pandemic.
Pivac’s men had already confirmed they would play Scotland and Georgia in Llanelli, but an announcement on the England game had been delayed.
Wales had hoped to play in front of crowds in order to bring in priceless revenue, but that has not proved possible after the country returned to lockdown.
Wales face Scotland in the Six Nations in Llanelli on Saturday and will then meet Georgia, England and an opponent to be confirmed at Parc y Scarlets in the Autumn Nations Cup.
The Scotland game follows a 38-21 friendly loss in Paris last weekend.
Flanker Wainwright said of the move to west Wales: “A lot of the boys have played regional rugby there. We’re looking forward to making it our home for a couple of matches and putting things right.
“International rugby is a lot more intense. We probably didn’t cope with it very well, but we’re looking forward to the challenge of Scotland.”
Reflecting on the loss in Paris, where Wales scored tries through Leigh Halfpenny and Nicky Smith, Wainwright added: “The step up from regional to international rugby is different.
“The speed of the game is a lot faster and you have to be a lot more careful with decision making.
“That can have a massive impact on the game. It’s been seven months without an international so to have that game was massive for us getting ready for Scotland.
“We’ll go away and review the things that did go well and have a look at the things that didn’t. In regional games we’ve had no crowds and it took a couple of games to adapt to that.
“In international rugby the crowds are a lot bigger and there is a lot more energy in the stadium. From a players’ point of view we did miss that. Hopefully we can put it right next week.
“We’ll put a big focus on getting things right for Scotland.”