| Cover | Apr. 29, 2022 |
| Entity Addresses [Line Items] | |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | Apr. 29, 2022 |
| Current Fiscal Year End Date | --12-31 |
| Entity File Number | 001-39736 |
| Entity Registrant Name | NuScale Power Corporation |
| Entity Central Index Key | 0001822966 |
| Entity Tax Identification Number | 98-1588588 |
| Entity Incorporation, State or Country Code | DE |
| Entity Address, Address Line One | 6650 SW Redwood Lane |
| Entity Address, Address Line Two | Suite 210 |
| Entity Address, City or Town | Portland |
| Entity Address, State or Province | OR |
| Entity Address, Postal Zip Code | 97224 |
| City Area Code | 971 |
| Local Phone Number | 371-1592 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Entity Emerging Growth Company | true |
| Elected Not To Use the Extended Transition Period | false |
| Entity Information, Former Legal or Registered Name | Spring Valley Acquisition Corp |
| Class A common stock, $0.0001 par value per share | |
| Entity Addresses [Line Items] | |
| Title of 12(b) Security | Class A common stock, $0.0001 par value per share |
| Trading Symbol | SMR |
| Security Exchange Name | NYSE |
| Warrant [Member] | |
| Entity Addresses [Line Items] | |
| Title of 12(b) Security | Warrants to purchase Class A common stock |
| Trading Symbol | SMR WS |
| Security Exchange Name | NYSE |
| Former Address [Member] | |
| Entity Addresses [Line Items] | |
| Entity Address, Address Line One | 2100 McKinney Avenue |
| Entity Address, Address Line Two | Suite 1675 |
| Entity Address, City or Town | Dallas |
| Entity Address, State or Province | TX |
| Entity Address, Postal Zip Code | 75201 |
