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Related Party Transactions	3 Months Ended	12 Months Ended
	Mar. 31, 2022	Dec. 31, 2021
Related Party Transactions	11.Related Party Transactions From time to time, the Company enters into strategic agreements with Fluor, whereby Fluor or NuScale perform services for one another. For the three months ended March 31, 2022 and 2021, NuScale incurred expenses of $3,601 and $3,193, respectively, related to such arrangements. As of March 31, 2022 and 2021, NuScale owes Fluor, as accounts payable, amounts totaling $2,100 and $1,021, respectively. For the three months ended March 31, 2022 and 2021, NuScale earned revenue of $1,561 and $441, respectively.	10. Related Party Transactions From time to time, the Company enters into strategic agreements with Fluor, whereby Fluor or NuScale perform services for one another. For the years ended December 31, 2021 and 2020, NuScale incurred expenses of $18,113 and $4,452, respectively. As of December 31, 2021 and 2020, NuScale owes Fluor, as accounts payable, amounts totaling $3,731 and $1,949, respectively. For the years ended December 31, 2021 and 2020, NuScale earned revenue of $1,553 and $0, respectively.
SPRING VALLEY ACQUISITION CORP
Related Party Transactions	Note 5 - Related Party Transactions Founder Shares On August 21, 2020, the Sponsor paid $25,000 to the Company in consideration for 7,187,500 Class B ordinary shares (the “Founder Shares”). In September 2020, the Sponsor transferred 40,000 Founder Shares to each of the Company’s directors (120,000 shares in total). On October 22, 2020, the Sponsor effected a surrender of 1,437,500 Founder Shares to the Company for no consideration, resulting in 5,750,000 Founder Shares outstanding. The Sponsor transferred all of the Founder Shares owned by the Sponsor to SV Acquisition Sponsor Sub, LLC, a Delaware limited liability company and wholly owned subsidiary of the Sponsor (“Holdco”), prior to the closing of the Initial Public Offering. The Founder Shares included an aggregate of up to 750,000 shares that were subject to forfeiture depending on the extent to which the underwriters’ over-allotment option was exercised, so that the number of Founder Shares would equal, on an as-converted basis, approximately 20% of the Company’s issued and outstanding ordinary shares after the Initial Public Offering. As a result of the underwriters’ election to fully exercise their over-allotment option, a total of 750,000 Founder Shares are no longer subject to forfeiture. The Sponsor has agreed, subject to limited exceptions, not to transfer, assign or sell any of the Founder Shares until the earliest of (A) one year after the completion of a Business Combination and (B) subsequent to a Business Combination, (x) if the closing price of the Class A ordinary shares equals or exceeds $12.00 per share (as adjusted for share sub-divisions, share dividends, rights issuances, reorganizations, recapitalizations and the like) for any 20 trading days within any 30-trading day period commencing at least 150 days after a Business Combination, or (y) the date on which the Company completes a liquidation, merger, share exchange or other similar transaction that results in all of the Public Shareholders having the right to exchange their Class A ordinary shares for cash, securities or other property. Administrative Support Agreement Commencing on November 23, 2020, the Company entered into an agreement to pay an affiliate of the Sponsor up to $10,000 per month for office space, secretarial and administrative services. Upon completion of a Business Combination or its liquidation, the Company will cease paying these monthly fees. For the three months ended March 31, 2022 and 2021, $30,000 has been expensed related to the agreement. As of March 31, 2022 and December 31, 2021, the Company had accrued $50,000 and $40,000, respectively, for services in connection with such agreement on the accompanying condensed consolidated balance sheets. Promissory Note - Related Party On August 21, 2020, the Company issued an unsecured promissory note (the “Promissory Note”) to the Sponsor, pursuant to which the Company could borrow up to an aggregate principal amount of $300,000. The Promissory Note was non-interest bearing and payable on the earlier of (i) December 31, 2020 or (ii) the completion of the Initial Public Offering. As of March 31, 2022 and December 31, 2021, there was no outstanding amounts under the Promissory Note. Subsequent to the repayment, the facility was no longer available to the Company. Related Party Loans In order to finance transaction costs in connection with a Business Combination, the Sponsor or an affiliate of the Sponsor or certain of the Company’s directors and officers may, but are not obligated to, loan the Company funds as may be required (“Working Capital Loans”). If the Company completes a Business Combination, the Company would repay the Working Capital Loans out of the proceeds of the Trust Account released to the Company. Otherwise, the Working Capital Loans would be repaid only out of funds held outside the Trust Account. In the event that a Business Combination does not close, the Company may use a portion of proceeds held outside the Trust Account to repay the Working Capital Loans, but no proceeds held in the Trust Account would be used to repay the Working Capital Loans. Except for the foregoing, the terms of such Working Capital Loans, if any, have not been determined and no written agreements exist with respect to such loans. The Working Capital Loans would either be repaid upon consummation of a Business Combination, without interest, or, at the lender’s discretion, up to $1,500,000 of such Working Capital Loans may be convertible into warrants of the post-Business Combination entity at a price of $1.00 per warrant. The warrants would be identical to the Private Placement Warrants. As of March 31, 2022 and December 31, 2021, there were no Working Capital Loans outstanding.	Note 5 - Related Party Transactions Founder Shares On August 21, 2020, the Sponsor paid $25,000 to the Company in consideration for 7,187,500 Class B ordinary shares (the “Founder Shares”). In September 2020, the Sponsor transferred 40,000 Founder Shares to each of the Company’s directors (120,000 shares in total). On October 22, 2020, the Sponsor effected a surrender of 1,437,500 Founder Shares to the Company for no consideration, resulting in 5,750,000 Founder Shares outstanding. The Sponsor transferred all of the Founder Shares owned by the Sponsor to SV Acquisition Sponsor Sub, LLC, a Delaware limited liability company and wholly owned subsidiary of the Sponsor (“Holdco”), prior to the closing of the Initial Public Offering. The Founder Shares included an aggregate of up to 750,000 shares that were subject to forfeiture depending on the extent to which the underwriters’ over-allotment option was exercised, so that the number of Founder Shares would equal, on an as-converted basis, approximately 20% of the Company’s issued and outstanding ordinary shares after the Initial Public Offering. As a result of the underwriters’ election to fully exercise their over-allotment option, a total of 750,000 Founder Shares are no longer subject to forfeiture. The Sponsor has agreed, subject to limited exceptions, not to transfer, assign or sell any of the Founder Shares until the earliest of: (A) one year after the completion of a Business Combination and (B) subsequent to a Business Combination, (x) if the closing price of the Class A ordinary shares equals or exceeds $12.00 per share (as adjusted for share sub-divisions, share dividends, rights issuances, reorganizations, recapitalizations and the like) for any 20 trading days within any 30-trading day period commencing at least 150 days after a Business Combination, or (y) the date on which the Company completes a liquidation, merger, share exchange or other similar transaction that results in all of the Public Shareholders having the right to exchange their Class A ordinary shares for cash, securities or other property. Administrative Support Agreement Commencing on November 23, 2020, the Company entered into an agreement to pay an affiliate of the Sponsor up to $10,000 per month for office space, secretarial and administrative services. Upon completion of a Business Combination or its liquidation, the Company will cease paying these monthly fees. For the year ended December 31, 2021 and for the period from August 20, 2020 (inception) through December 31, 2020, $120,000 and $0, respectively, has been expensed related to the agreement. As of December 31, 2021, the Company had accrued $40,000, for services in connection with such agreement on the accompanying consolidated balance sheets. There was no outstanding balance under this agreement as of December 31, 2020. Promissory Note — Related Party On August 21, 2020, the Company issued an unsecured promissory note (the “Promissory Note”) to the Sponsor, pursuant to which the Company could borrow up to an aggregate principal amount of $300,000. The Promissory Note was non-interest bearing and payable on the earlier of (i) December 31, 2020 or (ii) the completion of the Initial Public Offering. As of December 31, 2021 and 2020, there is no outstanding amounts under the Promissory Note. Subsequent to the repayment, the facility was no longer available to the Company. Related Party Loans In order to finance transaction costs in connection with a Business Combination, the Sponsor or an affiliate of the Sponsor or certain of the Company’s directors and officers may, but are not obligated to, loan the Company funds as may be required (“Working Capital Loans”). If the Company completes a Business Combination, the Company would repay the Working Capital Loans out of the proceeds of the Trust Account released to the Company. Otherwise, the Working Capital Loans would be repaid only out of funds held outside the Trust Account. In the event that a Business Combination does not close, the Company may use a portion of proceeds held outside the Trust Account to repay the Working Capital Loans, but no proceeds held in the Trust Account would be used to repay the Working Capital Loans. Except for the foregoing, the terms of such Working Capital Loans, if any, have not been determined and no written agreements exist with respect to such loans. The Working Capital Loans would either be repaid upon consummation of a Business Combination, without interest, or, at the lender’s discretion, up to $1,500,000 of such Working Capital Loans may be convertible into warrants of the post-Business Combination entity at a price of $1.00 per warrant. The warrants would be identical to the Private Placement Warrants. As of December 31, 2021 and 2020, there were no Working Capital Loans outstanding.

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- Definition

The entire disclosure for related party transactions. Examples of related party transactions include transactions between (a) a parent company and its subsidiary; (b) subsidiaries of a common parent; (c) and entity and its principal owners; and (d) affiliates.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 850
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 850
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 850
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 850
-URI http://asc.fasb.org/topic&trid=2122745

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 850
-SubTopic 10
-Section 50
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39691-107864

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