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Merger Transaction - Schedule of Common Stock Outstanding (Details) - shares
 6 Months Ended
May 03, 2022
Jun. 30, 2022
Business Acquisition, Equity Interests Issued or Issuable [Line Items]    
Legacy NuScale Equityholders (shares) 178,396,711  
PIPE Shares (shares) 23,700,002  
Total Shares at Closing (excluding shares below) (shares) 220,368,091  
Remaining NuScale Consideration Shares - upon Exercise of NuScale Corp Options (shares) 14,742,933 775,094
Other - Earn Out Shares (shares) 1,643,924  
Total Shares (shares) 236,754,948  
Stock converted, reverse recapitalization, percentage of total shares outstanding 81.00%  
Stock issued during period, shares, reverse recapitalization, percentage of total shares outstanding 10.80%  
% 100.00%  
Spring Valley    
Business Acquisition, Equity Interests Issued or Issuable [Line Items]    
Stock issued during period, acquisitions (shares) 18,271,378  
Stock issued during period, shares, acquisitions, percentage of total shares outstanding 8.30%  
Spring Valley Class A Shareholders    
Business Acquisition, Equity Interests Issued or Issuable [Line Items]    
Stock issued during period, acquisitions (shares) 14,400,369  
Stock issued during period, shares, acquisitions, percentage of total shares outstanding 6.50%  
Spring Valley Founders    
Business Acquisition, Equity Interests Issued or Issuable [Line Items]    
Stock issued during period, acquisitions (shares) 3,871,009  
Stock issued during period, shares, acquisitions, percentage of total shares outstanding 1.80%