ML18103A198

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Chapter 11 Audit Report - June Through November 2017
ML18103A198
Person / Time
Site: NuScale
Issue date: 04/30/2018
From: Markley A
NRC/NRO/DNRL/LB1
To: Samson Lee
NRC/NRO/DNRL/LB1
Markley A
References
Download: ML18103A198 (21)
v • d • e


Text

April 30, 2018 MEMORANDUM TO: Samuel S. Lee, Chief Licensing Branch 1 Division of New Reactor Licensing Office of New Reactors FROM: Anthony W. Markley, Senior Project Manager /RA/

Licensing Branch 1 Division of New Reactor Licensing Office of New Reactors

SUBJECT:

AUDIT

SUMMARY

FOR THE REGULATORY AUDIT OF THE RADIOACTIVE WASTE MANAGEMENT SYSTEM FOR NUSCALE POWER, LLC NuScale Power, LLC (NuScale), submitted by letter dated December 31, 2016, to the U.S.

Nuclear Regulatory Commission (NRC) a Design Control Document for its Design Certification Application (DCA) of the NuScale small modular reactor (SMR) design (Agency wide Documents Access and Management System Accession (ADAMS) No. ML17013A229). The NRC staff started its detailed technical review of NuScales DCA on March 27, 2017.

The purpose of the NRCs regulatory audit of the Radioactive Waste Management System aspects of the DCA was to: (1) gain a better understanding of the NuScale SMR design; (2) assess submitted information; (3) identify information that will require docketing to support the licensing basis and/or regulatory decisions; and (4) review related non-docketed information to allow the NRC staff to better inform their regulatory decision making.

During Phase I of the DCA review, the NRC staff conducted a safety audit of the Radioactive Waste Management aspects of the DCA. The audit was conducted in accordance with the NRC Office of New Reactors (NRO) Office Instruction, NRO-REG-108, Regulatory Audits (ADAMS Accession No. ML081910260). The audit was conducted from June 20, 2017, through November 15, 2017, in accordance with, Audit Plan for the Regulatory Audit of Chapter 11, Radioactive Waste Management for NuScale Power LLC (ADAMS Accession No. ML17159A685).

The NRC staff focused its review on information related to the unique and novel features of the NuScale SMR design and de-emphasized those aspects found similar to, or that had a lower radiological significance than other large light-water reactor designs. The NRC staff used the supporting information contained in the DCA and NuScale Technical Report TR-1116-52065-NP, Revision 0, Effluent Release (GALE Replacement) Methodology and Results, to evaluate the analytical results provided in the tables and figures of the application.

CONTACTS: Anthony W. Markley, NRO/DNRL Stephen Williams, NRO/DNRL 301-415-3165 301-415-6498

S. Lee 2 Where clarification was needed, the NRC staff used information available through the audit to examine the methods, models, and assumptions implemented by the applicant to determine the radioactive material content of systems, structures, and components, kinds and quantities of the resultant radiation sources and source terms, types of design features provided to support the radioactive waste management system, and the calculated doses to radiation workers and members of the public.

Enclosed with this memorandum are materials relevant to the closure of this audit. The enclosures are as follows: (1) NuScale Power, LLC, DCA Radioactive Waste Management System Audit Report, (2) Specific Audit Items, (3) Specific Editorial Items, and (4) Requests for Additional Information.

Docket No.52-048

Enclosures:

1. Audit Report
2. Specific Audit Items
3. Specific Editorial Items
4. Requests for Additional Information

ML18103A198 NRO-002 OFFICE DNRL/LB1: LA DSEA/RPAC DSEA/RPAC: BC DSEA: DD DNRL/LB1: PM NAME MMoore SWilliams MDudek ACampbell AMarkley DATE 4/16/2018 4/24/2018 4/24/2018 4/4/2018 4/24/2018 U.S. NUCLEAR REGULATORY COMMISSION NUSCALE POWER, LLC DESIGN CONTROL APPLICATION RADIOACTIVE WASTE MANAGEMENT SYSTEM AUDIT REPORT JUNE 20, 2017 - NOVEMBER 15, 2017

1. BACKGROUND The purpose of this U.S. Nuclear Regulatory Commissions (NRC) regulatory audit was to facilitate the NRC staffs evaluation of information related to its safety analyses for the Radioactive Waste Management System; and to facilitate its safety review of NuScale Power, LLC (NuScale) Design Certification Application (DCA) Chapter 11, Radioactive Waste Management, as well as the related supporting sections of the application. The NRC staff also:
  • Gained a better understanding of the NuScale design,
  • Assessed submitted information,
  • Identified information that will require docketing to support the licensing basis and/or regulatory decisions,
  • Reviewed related non-docketed information to allow the NRC staff to better inform their regulatory decision making, and
  • Developed follow-up requests for additional information.

The NRC staff focused its review on information related to the unique and novel features of the NuScale small modular reactor (SMR) design and de-emphasized those aspects found to be similar to large light-water reactors (LWRs). The NRC staff used the supporting information contained in the DCA and NuScale Technical Report (TR)-1116-52065-NP, Revision 0, Effluent Release (GALE Replacement) Methodology and Results, to evaluate the analytical results provided in the tables and figures of the application. Where clarification was needed, the NRC staff used information available through the audit to examine the methods, models, and assumptions implemented by the applicant to determine the radioactive material content of structures, systems, and components (SSCs), kinds and quantities of the resultant radiation sources and source terms, types of design features provided to support the radioactive waste management system, and the calculated doses to radiation workers and members of the public.

2. Regulatory Basis The NRC staffs criteria is based on meeting the relevant requirements of the following NRC regulations:
  • Title 10 of the Code of Federal Regulations (CFR) Part 20, Appendix B
  • 40 CFR Part 190
3. Audit Agenda The NRC staff held 18 meetings with the applicant throughout the audit at the NuScale office in Rockville, Maryland, at the NRC Headquarters, or by telephone with NuScale. The NRC staff used these meetings to facilitate an understanding of the NuScale DCA, and the information the applicant had made available for review by the NRC staff.

June 20, 2017 Entrance Meeting August 2, 2017 Audit Meeting August 10, 2017 Audit Meeting August 17, 2017 Audit Meeting August 23, 2017 Audit Meeting August 30, 2017 Audit Meeting September 6, 2017 Audit Meeting September 13, 2017 Audit Meeting September 20, 2017 Audit Meeting September 27, 2017 Audit Meeting October 4, 2017 Audit Meeting October 5, 2017 Failed Fuel Fraction Meeting October 10, 2017 Audit Meeting October 11, 2017 Audit Meeting October 18, 2017 Audit Meeting October 31, 2017 Audit Meeting November 7, 2017 Audit Meeting November 15, 2017 Exit Meeting

4. Audit Participants NRC Staff

Participants:

  • Stephen E. Williams (NRO, Chapter 11 Audit Lead)
  • Ron LaVera (NRO)
  • Edward Stutzcage (NRO)
  • Anthony Markley (NRO, Senior Project Manager)

NuScale (and Other Support Organization)

Participants:

  • Mark Shaver
  • Jon Bristol
  • Liz English
  • Jim Osborn
  • Steve Mirsky
  • Paul Guinn
  • Greg Myers
  • Jennie Wike
  • Carrie Fosaaen
  • Tom Crabtree
  • Steve Pope
  • Steve Unikewicz
  • Patrick Conley
  • Ron Wise
5. Information Made Available by NuScale for Review by the NRC Staff During the course of the audit, NuScale provided the NRC staff with electronic access to information used in analyzing the NuScale SMR design. The types of information included:

calculation packages, LADTAP II input/output (I/O) files, GASPAR II I/O files, RADTRAD I/O files, ORIGEN I/O files, MCNP I/O files, Excel spreadsheets, piping and instrumentation diagrams, technical reports, and other related technical documents that supports information contained in the DCA.

6. Deviations from the Audit Plan There were no identified deviations from the audit plan.
7. Audit Activities The NRC staff focused its review on information related to the unique and novel features of the NuScale SMR design and de-emphasized those aspects found to be similar to large LWRs.

The NRC staff used the supporting information contained in the DCA and TR-1116-52065-NP to evaluate the analytical results provided in the tables and figures of the application. Where clarification was needed, the NRC staff used information available through the audit to examine the methods, models, and assumptions implemented by the applicant to determine the radioactive material content of SSCs, kinds and quantities of the resultant radiation sources and source terms, types of design features provided to support the radioactive waste management system, and the calculated doses to members of the public.

During the audit, the NRC staff reviewed a range of topics, primarily using the guidance contained in the NuScale Design Specific Review Standard (DSRS) Section 11.1, Coolant Source Terms (ADAMS Accession No. ML1130704492); DSRS Section 11.2, Liquid Waste Management System (ADAMS Accession No. ML15355A334); DSRS Section 11.3, Gaseous Waste Management System (ADAMS Accession No. ML15355A335); DSRS Section 11.4, Solid Waste Management System (ADAMS Accession No. ML15355A336); and DSRS Section 3

11.5, Process and Effluent Radiological Monitoring Instrumentation and Sampling Systems (ADAMS Accession No. ML15355A337).

The NRC staff also used the guidance in NUREG-0800, Standard Review Plan for the Review of Safety Analysis Reports for Nuclear Power Plants: LWR Edition (SRP), Branch Technical Position (BTP) 11-3, Design Guidance for Solid Radioactive Waste Management Systems Installed in Light-Water-Cooled Nuclear Power Plants (ADAMS Accession No. ML070730202);

BTP 11-5, Postulated Radioactive Release Due to a Waste Gas System Leak or Failure (ADAMS Accession No. ML12258A115); and BTP 11-6, Postulated Radioactive Releases Due to Liquid-Containing Tank Failures (ADAMS Accession No. ML070720635).

The DSRS and SRP are not a substitute for NRC regulations and compliance with them is not required. As an alternative, an applicant may identify any differences between a DSRS section and the design features, analytical techniques, and procedural measures proposed in an application and discuss how the proposed alternative provides an acceptable method of complying with NRC regulations that underlie the DSRS acceptance criteria. Where the DCA contents differed from the guidance contained in the DSRS, the NRC staff reviewed the associated analytical techniques, data and conclusions, associated with the proposed alternative.

Through interactions with the applicant during the NRC staffs review of the information described above, if additional questions could not be answered, they became either: (1) an editorial item, (2) an audit item, or (3) an RAI. All editorial, audit, or RAIs identified from the audit are attached to the audit report.

8. Audit Exit Summary The audit exit was held on November 15, 2017, by teleconference. During the exit, the NRC staff described the topical areas reviewed during the course of the audit. The NRC staff also identified the 36 audit items (10 editorial items, 15 audit items, and 11 RAIs). Per the request of the applicant, RAIs were issued for areas for which the NRC staff is seeking additional clarification. audit and editorial items are described in Enclosures 2 and 3.
9. Specific RAIs After discussions between the NRC staff and the applicant during the audit, the following RAIs were issued as a result of the audit:
  • RAI-8750 Branch Technical Position (BTP) 11-6 Postulated accidental liquid tank failure analysis.
  • RAI-8752 RG 1.110 Cost benefit analysis (CBA).
  • RAI-8755 BTP 11-5 Postulated accidental waste gas system leak failure analysis.
  • RAI-9161 Realistic Failed Fuel Fraction (RFFF) and Technical Report TR-1116-52065-NP.

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  • RAI-9238 Type E Variable Clarification.
  • RAI-9239 Determining the basis for the dilution flow rates.
  • RAI-9240 RG 1.143 System Boundary Clarification.
  • RAI-9251 Waste generation rates and storage areas.
  • RAI-9253 Tc-99 and tritium source terms. contains a discussion of RAIs 9161, 9253, and 9239 and all have been issued.

RAI 9161 has a delayed response that the NRC staff is tracking that also includes RAIs 9253 and 9239.

10. Specific Open Items The audit resulted in 10 editorial items, 15 audit Items, 11 RAIs for a total of 36 audit items.
11. List of acronyms and abbreviations ADAMS - Agencywide Documents Access and Management System AOO - Anticipated Operational Occurrences BTP - Branch Technical Position CES - Containment Evacuation System COL - Combined Operating License CRVS - Normal Control Room HVAC System CVCS - Chemical and Volume Control System DBFFF - Design Basis Failed Fuel Fraction DCA - Design Certification Application DSRS - NuScale Design Specific Review Standard ECL - Effluent Concentration Level EPRI - Electric Power Research Institute FFF - Failed Fuel Fraction (DBFFF or RFFF)

FRED - EPRI Fuel Reliability Database FSAR - Final Safety Analysis Report GAC - Granulated Activated Charcoal GDC - General Design Criterion GRWS - Gaseous Radioactive Waste System HIC - High Integrity Container HVAC - Heating Ventilation and Air Conditioning I/O - Input/Output ITAAC - Inspections, Tests, Analyses, and Acceptance Criteria LRWS - Liquid Radioactive Waste System LWR - Light Water Reactor NEI - Nuclear Energy Institute NPM - Nuclear Power Module NPP - Nuclear Power Plant NRC - Nuclear Regulatory Commission NRO - Office of New Reactors 5

PCUS - Pool Cleanup System PWR - Pressurized Water Reactor P&ID - Piping and instrumentation diagrams RAI - Request for Additional Information RCS - Reactor Coolant System RFFF - Realistic Failed Fuel Fraction RG - Regulatory Guide RPAC - Radiation Protection and Accident Consequences Branch RPCS - Reactor Pool Cooling System RWB - Radioactive Waste Building RXB - Reactor Building SFPCS - Spent Fuel Pool Cooling System SMR - Small Modular Reactor SSC - Structures, Systems, and Components SRP - Standard Review Plan (NUREG-0800)

SRST - Spent resin storage tank SRWS - Solid Radioactive Waste System TS - Technical Specifications U.S. - United States X/Q - Atmospheric Dispersion Factor 10 CFR - Title 10 of the Code of Federal Regulations 6

SPECIFIC AUDIT ITEMS The audit items listed below are those items identified by the U.S. Nuclear Regulatory Commission (NRC) staff that did not warrant an RAI, but were considered technical issues that NuScale Power, LLC (NuScale) had agreed to incorporate in Revision 1 of the Design Certification Application (DCA). The NRC staff will verify the audit items inclusion in Revision 1 of the DCA.

Audit DCA NuScale Agenda Item NuScale Resolution Item Section 1 11.1 Section 11.1, Table 11.1-6 values for the NuScale will annotate Table radionuclides Nb95 and Ag110m do not 11.1-6 in Revision 1 to DCA.

agree with the activity listed in Table 11.1- NuScale explained that Ag110m 4 multiplied by 10, as do most of the other contribution was overly radionuclides. Table 11.1-6 values shown conservative. NuScale agreed are 8.3783E-07 microcuries/gram (uCi/g) to change Ag-110m to the value and 2.5105E-04 uCi/g versus 3.3160E-06 contained in ANSI/ANS- 18.1-uCi/g and 2.7848E-04 uCi/g, respectively, 1999. This value will be the in Table 11.1-4. Explain these same for both normal operation discrepancies and provide a DCA markup and DBA source terms.

to include any changes. NuScale also agreed to provide to explanation the values selected for Nb-95. The NRC staff will verify this item in Revision 1 of the DCA.

2 11.2 In Table 11.2-8, there is no summation of NuScale agreed to revise Table the unity rule analysis with the ECLs. 11.2-8 to add the sum of the Provide a DCA markup to include this fraction of ECLs to indicate information. compliance with 10 CFR 20 Appendix B Note 4. The NRC staff will verify this item in Revision 1 of the DCA.

Enclosure 2

Audit DCA NuScale Agenda Item NuScale Resolution Item Section 3 11.2 The applicant is requested to address the NuScale agreed to add a final sentence in the Chemical Waste pointer in section 11.2 to direct paragraph, which states Administrative the reader to this COL Item for controls prohibit the mixing of nitrate admin controls in COL Item 9.2-containing fluids with demineralizer 1. The NRC staff will verify this resins. item in Revision 1 of the DCA.

a. Where will these admin controls be located?
b. Should it be an ITAAC or COL Action item?

4 11.2 The applicant is requested to address the NuScale agreed to change the following issues that occur on DCA meaning of these statements.

Chapter 11 pages 11.2-8 and 11.2-12. The NRC staff will verify this item in Revision 1 of the DCA.

a. On page 11.2-8, following the bullets, the text reads Refer to the LCW mobile processing equipment skid for additional details on the skid components.
b. On page 11.2-12, the line of text directly above the Safety Evaluation section states See Section 11.2.5 for automatic control features as a result of upset conditions.
c. These two sentences read as actions that need to be taken vice pointers to help the reader.

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Audit DCA NuScale Agenda Item NuScale Resolution Item Section 5 11.2 The applicant is requested to address the The applicant will use SRP following issue that occurs in DCA and/or DSRS nomenclature to Sections 11.2, 11.3, and 11.4. make these sections consistent throughout the DCA. The NRC

a. Theres inconsistency with the systems staff will verify this item in name (LWMS vs LRWS). Revision 1 of the DCA.
i. The title and header both state Liquid Waste Management System, as well as the DSRS.

ii. The text uses liquid radioactive waste system on the first line and throughout the text.

iii. DCA Chapter 1 has both listed on the acronym list.

b. The applicant should change all LRWS, GRWS, and SRWS, including all pointer in various sections outside of DCA Chapter 11.

6 11.3 In DCA Table 11.3-5, there doesn't seem NuScale agreed to provide to be any results/summation of the additional text in DCA Section analysis for compliance with the ECLs. text to explain the X/Q value in Explanation on what X/Q was used to Table 11.3-5. The NRC staff determine the unci/mL as a footnote to will verify this item in Revision 1 DCA Table 11.3-5. of the DCA.

7 11.3 In DCA Section 11.3.3 under the heading NuScale agreed to provide Containment Leakage AOO, the NRC additional text in DCA Section staff is seeking information on what 11.1 to provide reference to TR-specific input values the applicant is 116-52065. The NRC staff will referencing from NUREG-0017 for verify this item in Revision 1 of gaseous effluent release AOO. the DCA.

8 11.3 Include text in DCA Section 11.3 that NuScale agreed to provide explains an elevated release. additional text in DCA Section 11.3 to describe the stack and the release pathway. The NRC staff will verify this item in Revision 1 of the DCA.

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Audit DCA NuScale Agenda Item NuScale Resolution Item Section 9 11.4 Other sources of wet solid waste include NuScale agreed to provide spent cartridge filters from the liquid additional text in DCA Section radioactive waste system CVCS and pool 11.4.2.2 to describe the TUF cleanup system, TUF and RO filter and RO from DCA Section 11.2.

membranes and rejects from the LRWS, The NRC staff will verify this and oily wastes from LRWS. Explain item in Revision 1 of the DCA.

what "rejects" are.

10 11.4 Each of the two PSTs is sized to receive NuScale agreed to provide spent resins from the LRW demineralizers additional text in DCA Section for at least two years of plant operation, 11.4 to describe the separation plus the associated flush water. The of wastes. The NRC staff will carbon from the GAC bed is normally verify this item in Revision 1 of transferred directly to a HIC instead of a the DCA.

PST to prevent mixing the carbon with spent resins. Why is this done?

11 11.4 In large how are transportation NuScale agreed to provide requirements addressed for solid rad additional text in DCA Section waste and identify the applicable 11.4.2.5.5 to state the regulations. transportation requirements are in accordance with NEI Template 07-10A. The NRC staff will verify this item in Revision 1 of the DCA.

12 11.4 Request clarification on what modular NuScale agreed to provide equipment is vs mobile equipment. See additional text in DCA Section DCA Section 11.4.2.9 11.4.2.9 to clarify the difference between modular equipment and mobile equipment. The NRC staff will verify this item in Revision 1 of the DCA.

13 11.4 Question about why the Spent Resin NuScale agreed to provide storage tank is so large. 16,000 gallons additional text in DCA Section (DCA Table 11.4-1) for what appears to 11.4 to describe the inputs into be for 450 ft3/yr of waste generation (as the Spent Resin Storage Tank.

found in DCA Section 11.4-3). The NRC staff will verify this item in Revision 1 of the DCA.

14 11.2 What is the basis of the flow rates used NuScale agreed to provide for 10 CFR Part 20 compliance additional text to describe the calculations and 10 CFR Part 50 different flowrates used in the Appendix I calculations? Section 11.2.3.3 analysis contained in DCA states 2 separate flow rates. Section 11.2. The NRC staff will verify this item in Revision 1 of the DCA.

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Audit DCA NuScale Agenda Item NuScale Resolution Item Section 15 11.2, The NRC staff proposed to provide NuScale agreed to provide 11.3, NuScale with standard language to clarify additional text in DCA Section 11.4 if a systems isolation valve was included 11.2, 11.3, and 11.4 to define in the description for RG 1.143 the system boundaries. The components. The NRC staff proposed the NRC staff will verify this item in following standard text: Revision 1 of the DCA.

Each radwaste SSC classifications need to address the following information:

1. All components connected to a component classified as a RW-IIa (e.g.,

piping, pumps, etc.) are also classified as RW-IIa, up to and including the nearest isolation component (e.g., isolation values), on each connection, to the RW-IIa component.

2. All components connected to a component classified as a RW-IIb (e.g.,

piping, pumps, etc.) are also classified as RW-IIb, up to and including the nearest isolation component (e.g., isolation values), on each connection, to the RW-IIb component.

3. All components connected to a component classified as a RW-IIc (e.g.,

piping, pumps, etc.) are also classified as RW-IIc, up to and including the nearest isolation component (e.g., isolation values), on each connection, to the RW-IIc component.

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SPECIFIC EDITORIAL ITEMS The editorial items listed below are those items identified by NRC staff that did not warrant an RAI and were minor editorial fixes that NuScale agreed to incorporate in Revision 1 of the DCA.

The NRC staff will verify the editorial items inclusion in Revision 1 of the NuScale DCA.

Editorial Question NuScale Resolution No.

1 Clarify/justify the text on page 11.2-4 in the RCCW NuScale agreed to provide Drain Tank, section. On page 11.2-4, the text in the a pointer to DCA Section section titled RCCW Drain Tank reads The reactor 9.2.2 that describes the component cooling water drain tank collects water various components that drained from various RCCWS components prior to drain to the RCCW drain maintenance. The RCCWS is normally non-radioactive tank. The NRC staff will and is normally returned to the RCCWS as makeup verify this item in Revision water. Address the following: 1 of the DCA.

1. List the various RCCWS components that drain to the tank. By listing the components, the non-radioactive claim can be justified.
2. Justify that the water drained from the various RCCWS components is only done prior to maintenance.
3. Unlike other sections, there is no pointer to another section of the FSAR. Example: the Chemical Waste section on page 11.2-9 refers to Section 9.3.3.

Determine if a pointer should be included in the text.

Please address these items and provide a markup for the proposed DCA changes.

Enclosure 3

Editorial Question NuScale Resolution No.

2 This enhancement of the Figures in section 11.2 is NuScale agreed to provide required to ensure that there is sufficient design DCA Section 11.2 pointers information available in accordance with 10CFR50.34a. in the text to refer to Enhance the Figures in DCA Tier 2 Section 11.2 specific figures in the back Liquid Waste Management System (LWMS). On of 11.2. The NRC staff will page 11.2-3, the text refers to all of the Figures at the verify this item in Revision end of the section and reads Figure 11.2-1a through 1 of the DCA.

Figure 11.2-1j provide flow diagrams of the LRWS.

With regard to the Figures included in Section 11.2, note the following:

1. Although there are 10 Figures (11.2-1a through 11.2-1j) in total, several of them depict various subsystems of the entire LWMS. In order to accurately review the plant systems portion of the LWMS, include subsystem names in the titles of the Figures. For example: Figure 11.2-1a - Degasifiers, Figure 11.2-1b

- Low Conductivity Waste Collection System, Figure 11.2-1c - High Conductivity Waste Collection System, etc.

2. Add pointers to the appropriate Figures throughout the text in Section 11.2. For example: on page 11.2-5, the Low Conductivity Waste System section would include pointers to Figures 11.2-1a and 11.2-1b. On page 11.2-7, the High Conductivity Waste System section would include a pointer to Figure 11.2-1c.

Please address these items and provide a markup for the proposed DCA changes.

3 Ordered List Punctuation: NuScale agreed to make the editorial changes Whenever there is a bulleted list of items, proper provided. The NRC staff ordered list punctuation should be adhered to. The will verify this item in final item in the list ends with .. The second to last Revision 1 of the DCA.

item ends with , and. All other items in the list end in a comma. The sentence that leads to the list should end with :.

Examples of this issue can be seen on pages, 11.2-2, 11.2-3, 11.2-5, and 11.2-6.

The applicant is requested to perform a global check to ensure the text is accurate.

2

4 Initial Capitalization for Systems: NuScale agreed to make Whenever a system appears in the text for the first the editorial changes time, the system name should be spelled out using provided. The NRC staff initial capitalization followed by the acronym in will verify this item in parenthesis. Examples: Reactor Coolant System Revision 1 of the DCA.

(RCS) and As Low As Reasonably Achievable (ALARA). Following that first time, only the acronym should be used. Examples of this issue can be found on pages 11.2-1, 11.2-2, and 11.2-4. In the last line of text on page 11.2-14, the text includes reactor thermal power. This should be replaced with RTP, since Rated Thermal Power is a widely understood acronym. The applicant is requested to perform a global check to ensure the text is accurate.

5 The applicant is requested to address the following NuScale agreed to make editorial issues: the editorial changes provided. The NRC staff will verify this item in Page 11.2-1, First paragraph under Design Bases title, Revision 1 of the DCA.

2nd line. There is no comma needed between accidents and and.

Second paragraph under Design Bases title, the final 2 sentences arent complete sentences.

Third paragraph under Design Bases - dont need quotations marks around as low as reasonably achievable.

Page 11.2-4, Final line of the page - Take out processing, if radioactive. Insert processing if found to be radioactive.

Page 11.3-1 First paragraph under Design Bases title, 2nd line. There is no comma needed between accidents and and.

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Editorial Question NuScale Resolution No.

6 The applicant is requested to address an issue NuScale discussed that regarding the COL Items contained in the text in DCA this change has already Sections 11.2, 11.3, and 11.4. While the COL Items in been implemented. The the text do match the text in Table 1.8-2, there is a NRC staff will verify this minor discrepancy that occurs throughout. The word item in Revision 1 of the Applicant is capitalized in Table 1.8-2, but remains DCA.

lowercase in the body of the text 7 In DCA Table 11.2-3 the NRC staff notes some of the NuScale agreed to delete pathways are not completely described in DCA Section the 12x NUREG 0017, 11.2. The NRC staff notes a description of the waste Table 2-27 Reference for from the oil separator is not discussed in DCA Section the detergent waste source 11.2. Looking for information to understand where this term contributions.

waste pathway is expected to accumulate, and to Received clarification on understand if the figures provided in DCA Section 11.2 the liquid waste pathways accurately reflect the expected waste inputs. In considered. The NRC staff addition the NRC staff notes there is no expected liquid will verify this item in waste input from the detergent waste pathway. Is this Revision 1 of the DCA.

intentional or an oversight?

8 When making reference to the Exclusion Area NuScale stated that the Boundary (EAB), is the NRC staff to assume that this EAB and the Site Boundary also is the site boundary? What is the definition of the are used interchangeably.

EAB? DCA Section 2.1 contains the definition for the EAB.

The NRC staff will verify this item in Revision 1 of the DCA.

9 Table 11.4-4 Solid Radioactive Waste System NuScale agreed to make Equipment Malfunction Analysis, sixth item down Spent the editorial changes Resin Storage Tanks (SRSTs) and PSTs, under provided. The NRC staff Results (Consequences) states "The tanks cannot be will verify this item in pressurized to perform pneumatic sluicing to an HIC." Revision 1 of the DCA.

Should be "to perform pneumatic sluicing to a HIC."

10 DCA Table 11.2-7 shows incorrect total body (5 NuScale agreed to correct mrem/yr) and organ (15 mrem/yr) annual doses for total body (3 mrem/yr) and compliance with the 10 CFR Part 50, Appendix I organ (10 mrem/yr) annual ALARA design objectives for all evaluated exposure doses in DCA Table 11.2-pathways. 7. The NRC staff will verify this item in Revision 1 of the DCA.

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REQUESTS FOR ADDITIONAL INFORMATION The requests for additional information (RAIs) listed below are those items identified by staff that warranted additional investigation by the NRC staff and an RAI was discussed with and agreed upon with NuScale.

Item Request for Additional Information (RAI) RAI No. - Path No. Forward 1 The NRC staff and applicant also discussed topics such as the RAI 9161 Realistic Failed Fuel Fraction (RFFF), Design Basis Failed Fuel RAI response will be Fraction (DBFFF), Technical Specification 3.4.8, Reactor issued by NuScale Coolant System Specific Activity surveillance criteria, and the by August 31, 2018.

Maximum Hypothetical Accident (MHA) radionuclides and specific activity, as applied to design considerations for ventilation, shielding, Environmental Qualification (EQ), dose estimates for identified post-accident sampling activities, and effluent releases. The DCA information basis comes from the NuScale Technical Report TR-1116-52065-NP, Revision 0, Effluent Release (GALE Replacement) Methodology and Results.

The NRC staff and applicant discussed the RFFF value of 0.0028 percent or 28 parts per million (ppm) described in NuScale Technical Report TR-1116-52065-NP, Revision 0. As a result, the NRC staff requested in Request for Additional Information (RAI) 9161 that the applicant justify the basis of the RFFF and other information in TR-1116-52065-NP. The RFFF impacts (proportionally) normal operating source terms, effluent releases, and occupational and public doses. During the audit, the NRC staff contacted the Electric Power Research Institute (EPRI) for questions on fuel failure data the applicant had applied and cited in TR-1116-52065-NP. Based on information provided by EPRI, the NRC staff found that the source of compiled fuel failure data for U.S. nuclear power plants is from the EPRI Fuel Reliability Database (FRED). Although Technical Report TR-1116-52065-NP presents data and statistical analyses using historical fuel failure data (e.g., early 1970s through 1999), the EPRI source of validated data from FRED only dates back to year 2000. Using ERPI FRED data obtained during the audit, the applicant presented the NRC staff with an updated maximum RFFF value of 0.0066 percent or 66 ppm (from years 2007 through 2016 for U.S. pressurized water reactors (PWRs)). The NRC staff and applicant discussed an acceptable approach to determine a conservative RFFF for the NuScale SMR design, and agreed to use EPRI FRED data from years 2007 through 2016 (10 years) for U.S. PWRs, the maximum fuel failure value determined from those 10 years, and the outage fuel failure methodology. The applicants response to RAI 9161 is expected on August 31, 2018, due to a contract initiated with EPRI to obtain fuel failure data and the need to revise numerous calculations.

Enclosure 4

Item Request for Additional Information (RAI) RAI No. - Path No. Forward 2 The NRC staff reviewed the monitors contained in DCA Section RAI 9238 11.5. The NRC staff reviewed the monitor ranges and requested RAI issued to clarifications about several of the monitoring ranges provided in NuScale, clarification DCD Table 11.5-1. The NRC staff also reviewed the monitors call resulted in contained in the control room and the Normal Control Room revision of RAI 9238 HVAC System. In review of the committed guidance of RG 1.97 and re-issuance to the NRC staff questioned the availability of Type E monitors NuScale.

provided for the control room. The NRC staff and applicant discussed the lack of a Type E monitor for the control room air, however, the applicant stated that the downstream control room heating ventilation and air conditioning monitor would satisfy the Type E requirements, but also acknowledged that it was not currently classified as a Type E monitor. The NRC staff considers that a beta monitor in addition to the area monitor in the control room would satisfy the Type E functions and requirements to meet the committed guidance of RG 1.97.

3 The NRC staff has determined that the Realistic and design basis RAI 9253 source terms in the NuScale design exclude Tc-99, a long-lived RAI response will be and environmentally mobile radionuclide produced in the fuel, issued by NuScale which can escape as a fission product into the reactor coolant by August 31, 2018.

system for release into the environment. Tc-99 should be included in source terms, environmental transport analyses, and dose assessments, or its exclusion justified. (Question related to NRC eRAI 8750 and NuScale RAIO-0817-55643.)

Therefore, the NRC staff requests that NuScale include Tc-99 activities in the fuel, primary and secondary coolant for realistic and design basis source terms in DCD Chapter 11 Tables 11.1-1, 11.1-4, 11.1-5, 11.1-6, and 11.1-7, and TR-1116-25065-NP, or justify its exclusion; include Tc-99 activity in the postulated accidental liquid release source term for the pool surge control system in DCD Chapter 12 Table 12.2-10, or justify its exclusion; and based on the above, provide a DCD and TR-1116-25065-NP markup to include these changes.

The NRC staff also determined that the proposed alternate methodology used to calculate the tritium (H-3) production rate in the reactor coolant system (RCS) is non-conservative and underestimates H-3 concentrations in liquid and gaseous effluent releases during normal operations because it does not account for the buildup of H-3 due to recycling of previously used RCS. In the NuScale design, H-3 is the largest calculated water activation production reaction due to more water in the RCS per megawatt generated, higher capacity factor, and higher starting lithium concentration, which results in more H-3 production than a standard light water pressurized reactor. An increase in H-3 concentration results in a proportional increase to offsite public dose. (Question related to NRC eRAI 9270.)

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Item Request for Additional Information (RAI) RAI No. - Path No. Forward Therefore, the NRC staff requests that NuScale provide the method, model, and assumptions used to calculate the H-3 production rate in the RCS to account for H-3 buildup due to recycling of previously used RCS, or justify the current H-3 activity, concentration, and liquid and gaseous effluent release rates are conservative and bounding, and based on the above, provide a DCD and TR-1116-25065-NP markup to include these changes.

4 The NRC staff determined that the applicants explanation of RAI 9239 parameters were unclear for the liquid dose calculation Currently with performed in 10 CFR Part 50, Appendix I. The NRC staff NuScale for communicated that there was insufficient information in the DCA response.

regarding the liquid dilution flows that are needed to determine if the liquid effluent concentrations released are within regulatory limits. The applicant agreed with the NRC staffs assessment and indicated that additional information for the liquid effluent dilution flows would be provided in DCA Section 11.2.3.3, and DCD Table 11.2-4.

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