If anything, calling in outside authorities to assess the plant means that they expect it to pass inspection. That would give them justification for starting up more than 2 of the reactors, as what was initially planned. The longer it takes to restart, the greater number of reactors they'll be able to bring online at once.
It's surging because the decline in price of LNG. From someone more knowledgeable than me, it's going to raise net income this year to around 800 billion yen. This isn't retail speculation, it's a lower cost of revenue.