NUS CALE POWER - NRC

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L0-0518-60037

May 31 , 2018 Docket No. 52-048

U.S. Nuclear Regulatory Commission ATTN: Document Control Desk One White Flint North 11555 Rockville Pike Rockville, MD 20852-2738

SUBJECT: NuScale Power, LLC Submittal of Presentation Materials Entitled "NuScale Power Containment Leak Rate Test Program," PM-0518-59978, Revision 1

REFERENCES: 1. Letter from NuScale Power LLC, to Nuclear Regulatory Commission, "NuScale Power, LLC Submittal of the NuScale Standard Plant Design Certification Application ," dated December 31 , 2016 (ML 17013A229) Letter from NuScale Power LLC, to Nuclear Regulatory Commission, "NuScale Power, LLC Submittal of Presentation Materials Entitled 'NuScale Power Containment Leak Rate Test Program,' PM-0518-59978, Revision O, dated May 15, 2018

2.

NuScale Power, LLC (NuScale) participated in a public meeting with the NRC technical staff on May 17, 2018, to discuss the NuScale Containment Design and Appendix J Exemption Request which was submitted to the NRC in the referenced Design Certification Application .

The purpose of this submittal is to provide the presentation materials that NuScale used during th is meeting. The enclosure to this letter contains the presentation entitled "NuScale Power Containment Leak Rate Test Program," PM-0518-59978, Revision 1.

This letter makes no regulatory commitments and no revisions to any existing regulatory commitments .

If you have any questions, please contact ennie Wike at 541-360-0539 or at [email protected] .

Sincerely,

J~ (µ~ Manager, Licensing NuScale Power, LLC

Distribution : Samuel Lee, NRC, OWFN-8G9A Omid Tabatabai, NRC, OWFN-8G9A Prosanta Chowdhury, NRC, OWFN-8G9A Bruce Bavol , NRC, OWFN-8G9A

Enclosure: "NuScale Power Containment Leak Rate Test Program", PM-0518-59978, Revision 1

NuScale Power, LLC 1100 NE Circle Blvd ., Suite 200 Corvallis, Oregon 97330 Office 541 .360-0500 Fax 541.207.3928

www nuscalepower com

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Enclosure:

"NuScale Power Containment Leak Rate Test Program", PM-0518-59978, Revision 1

NuScale Power, LLC 1100 NE Circle Blvd ., Suite 200 Corvallis, Oregon 97330 Office 541 .360-0500 Fax 541 .207.3928

www.nuscalepower.com

L0-0518-60037

PM-0518-59978

Revision: 1

NuScale Nonproprietary

NuScale Power Containment Leak Rate Test Program

May 17, 2018

Jennie Wike Manager, Licensing, NuScale

Zack Houghton Manager, NSSS Design, NuScale

Copyright 2018 by NuScale Power, LLC.

· NuSCALE · POWER-

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Acknowledgement & Disclaimer

This material is based upon work supported by the Department of Energy under Award Number DE-NE0000633.

This report was prepared as an account of work sponsored by an agency of the United States Government. Neither the United States Government nor any agency thereof, nor any of their employees, makes any warranty, express or implied, or assumes any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed, or represents that its use would not infringe privately owned rights. Reference herein to any specific commercial product, process, or service by trade name, trademark, manufacturer, or otherwise does not necessarily constitute or imply its endorsement, recommendation, or favoring by the United States Government or any agency thereof. The views and opinions of authors expressed herein do not necessarily state or reflect those of the United States Government or any agency thereof.

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Agenda

• Overview of the NuScale Containment Leak Rate Testing (CLRT) program

• Initial design pressure testing and flange contact analysis

• Planned responses to eRAI 9474

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Containment Leak Rate Testing

• After shutdown, all Type Band C penetrations are as-found tested

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Type B penetrations Process Penetrations

CNV Closure Flange

CNV Head Manway Flange

CNV Head CRDM Access Flange

CNV Manway

SG Inspection Port 1




PZR Heater Port 1

PZR Heater Port 2

ECCS Trip and Rest Valves (11)

CIV Test Port Covers (8)

Electrical Penetrations

l&C Division 1 Penetration

l&C Division 2 Penetration

Electrical 1 - PZR Power Penetration

Electrical 2 - PZR Power Penetration

l&C Channel A Penetration Flange

l&C Channel B Penetration Flange

l&C Channel C Penetration Flange

l&C Channel D Penetration Flange

CRDM Power Penetration

RPI Group 1 Penetration

RPI Group 2 Penetration

Copyright 2018 by NuScale Power, LLC. ·. NUSCALE .' POWE::R-

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Containment Leak Rate Testing

• After shutdown, all Type Band C penetrations are as-found tested

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Type C penetrations

Description

CVCS Injection CIV

eves Discharge CIV

CVCS PZR Spray CIV

RPV High Point Degasification CIV

Containment Flood & Drain CIV

1

Containment Evacuation CIV

RCCWS Supply CIV

RCCWS Return CIV

SG Thermal Relief Valves


Quantity

2

2

2

2

2

2

2

2

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CLRT Overview

• As-left Type B or C test on any penetration impacted during maintenance

• Local leak rate test (LLRT) results shall meet< 0.6 La

• Module moved to operating bay

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Closure Flange Integrity Test • New test proposed to confirm integrity of the closure flange

seal after module movement

- Containment vessel pressurized with air during startup

- Test port monitored to provide assurance of leak tight condition of the

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closure flange joint with pressure inside containment


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Design Pressure Testing and Contact Force Analysis

• For the initial module, NuScale plans to perform initial design pressure testing of an assembled containment vessel with:

- design bolting materials

- bolt preload tensioning

- design double a-ring seals

• Subsequent modules may be initial design pressure tested as upper and lower module sections based on manufacturer limitations

• Initial design pressure testing requirements will ensure no leakage through any bolted joint at design basis pressure

• NuScale plans to complete analysis to show that contact force is maintained at the sealing joint for all Type B bolted connections

• Combination of initial design pressure testing and flange contact force analysis provides reasonable assurance that test program is sufficiently representative of accident conditions

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NuScale RAI 9474 Response

6.2.6-22

6.2.6-23

6.2.6-24

6.2.6-25

6.2.6-26

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Summary

Provide the technical basis for concluding that Type B and C testing are sufficiently representative of accident conditions.

Confirm that the factory hydrotest will be performed on an assembled containment vessel under design conditions. Add an ITAAC for the ASME code required hydro.

Confirm intent to demonstrate leak tight integrity after each refueling outage.

Identify key attributes and inspections verified for vessel reassembly. Add flange bolting inspection elements to TR-1116-51962.

Provide calculations for total expected leakage for all flanges, preload, and flange gaps at design pressure.

Analysis and initial design pressure testing ensure leakage characteristics not substantively different at ambient vs design pressure. Type B and C testing sum to less than 0.6 La.

Proposed initial design pressure test as requested on completely assembled initial unit with allowance to test separate upper and lower assemblies on subsequent units, maintaining design assembly configuration, and captured ITAAC.

As-found Type B for all flanges and as-left Type B on all opened flanges prior to return to operations. Closure flange integrity test proposed to ensure maintaining integrity at main seal following transport.

Inspection of bolting and cover, install of new seals, preload , verify preload of closure flange. Standard industry practices for bolted joint procedures. Closure flange integrity test proposed to ensure no gross main seal failure during transport.

Analysis will be completed to show no flange gap at design preload and accident conditions. Calculation will be provided to evaluate potential total leakage from joints. Leakage assumption will be preliminary estimates to show margin only.

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Summary • NuScale is proposing a new test to confirm integrity of the

closure flange seal after module movement

• Maximum allowable leak rate (L8 ) is demonstrated by

- Type B testing (as-left and as-found)

- Type C testing (as-left and as-found)

- analysis and initial design pressure test assure seal

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performance during design basis pressure conditions


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Portland Office 6650 SW Redwood Lane, Suite 210 Portland, OR 97224 971 .371.1592

Corvallis Office 1100 NE Circle Blvd., Suite 200 Corvallis, OR 97330 541 .360.0500

Rockville Office 11333 WoodglenAve ., Suite 205 Rockville, MD 20852 301 . 770.0472

Charlotte Office 2815 Coliseum Centre Drive, Suite 230 Charlotte, NC 28217 980.349.4804

Richland Office 1933JadwinAve., Suite 130 Richland, WA 99354 541 .360.0500

Arlington Office 2300 Clarendon Blvd., Suite 1110 Arlington, VA 22201

London Office 1st Floor Portland House Bressenden Place London SW1 E 5BH United Kingdom +44 (0) 2079 321700

http://www.nuscalepower.com 'ti Twitter: @NuScale_Power .::.·:· .. N USCALE

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NUS CALE POWER - NRC

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