ML18220A874
| ML18220A874 | |
| Person / Time | |
|---|---|
| Site: | NuScale |
| Issue date: | 07/25/2018 |
| From: | Harris S NuScale |
| To: | Office of New Reactors |
| Shared Package | |
| ML18220A872 | List: |
| References | |
| LO-0718-61173 PM-0718-61172, Rev. 0 | |
| Download: ML18220A874 (10) | |
Text
Enclosure:
"NuScale CIRLT-RAI 9474," PM-0718-61172 NuScale Power, LLC 1100 NE Circle Blvd., Suite 200 Corvallis, Oregon 97330 Office 541.360-0500 Fax 541.207.3928 www.nuscalepower.com L0-0718-61173
PM-0718-61172 Revision: O NuScale Nonproprietary NuScale CILRT-RAI 9474 July 25th, 2018 Scott Harris Gary McGee Ed Heald Corrie Nichol Copyright 2018 by NuScale Power, LLC.
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Template#: 0000-21727-F01 R3
Agenda
- Recap of proposed RAI response
- Preservice Design Pressure Leakage Test
- CNV flange analysis
- ITAAC
- Response summary
- Refueling Overview (video)
- Closed Session (proprietary)
- Screenshots of flange analysis model
- Additional slides for refueling discussion if needed 2
PM-0718-61172 Revision: 0 Copyright 2018 by NuScale Power, LLC.
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Template#: 0000-21727-F01 R3
CILRT
- 10 CFR Part 50, Appendix J Testing
- Type A (vessel test at accident pressure - NuScale seeks exemption)
- Type B (containment penetrations)
- Type C (containment isolation valves)
- In lieu of a Type A test, NuScale is proposing a preservice design pressure leakage test
Purpose:
Verify design of flange seals through leak test at design pressure 3
PM-0718-61172 Revision: O Copyright 2018 by NuScale Power, LLC.
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Preservice Design Pressure Leakage Test
- Test Characteristics
- CNV assembled with all flanges in place
- Take place in factory or onsite (must be out of RXB pool)
- Test will use final design flanges, bolting material (with design preload), and design seals
- Test will be performed with water as the pressure medium (similar to hydrotest)
- Test occurs at containment design pressure 4
PM-0718-61172 Revision: 0 Copyright 2018 by NuScale Power, LLC.
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,;:*POWER' Template#: 0000-21727-F01 R3
Preservice Design Pressure Leakage Test
- Acceptance Criteria
- Design pressure must be held for a minimum of 10 minutes prior to start of inspection
- Pressure will be maintained at or above design pressure for the time needed to visually inspect each vessel flange for leakage past outer flange seal
- Successful test is no visible leakage at bolted connections
- Similar to code requirements for a hydrotest
- Subsequent Modules
- Test may be modified so that upper and lower can be tested separately 5
PM-0718-61172 Revision: O Copyright 2018 by NuScale Power, LLC.
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CNV Bolting Analysis
- Updating the Containment Vessel Flange Bolting Calculation for new scope:
- Add analysis to demonstrate that inner a-ring seal contact is maintained for all CNV bolted flanges when internal containment is at design pressure when considering accident thermal transient conditions
- Add analysis to demonstrate that lifting and moving the module does not stress CNV bolted flanges in a manner that contributes to flange distortion or seal positioning that would create leakage
- Add assessment to show results of testing under ambient temperature conditions 6
PM-0718-61172 Revision: O Copyright 2018 by NuScale Power, LLC.
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CNV Bolting Analysis
- Models of the bottom, middle, and top of the CNV, similar to the CNV ultimate pressure integrity calc, are used. Each type of bolted flange connection is modeled
- Stud, nuts, washers and threaded inserts are included in the mode with contact defined between the nuts-washers, washers-flange, and cover-flange
- All bolted connection preloads are calculated with margin over minimum preload need to maintain a tight joint
- Thermal transient analyzed to obtain temperature distribution through CNV for inadvertent RRV opening and eves injection line break transients
- The design pressure will be applied with temperature occurring at the time of peak accident pressure.
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ITAAC 02.01.07
- Design Commitment
- The CNV serves as an essentially leak-tight barrier against the uncontrolled release of radioactivity to the environment.
- Inspections, Tests, Analyses
- A leakage test will be performed of the pressure containing or leakage-limiting boundaries, and CIVs.
- Acceptance Criteria
- The leakage rate for local leak rate tests (Type B and Type C) for pressure containing or leakage-limiting boundaries and CIVs meets the requirements of 10 CFR Part 50, Appendix J.
- This ITAAC will be modified to include Acceptance Criteria for the preservice leak test at design pressure, with clarifying details added to Tier 2, Section 14.3.
8 PM-0718-61172 Revision: 0 Copyright 2018 by NuScale Power, LLC.
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Summary of RAI 9474 Response
- Update to Technical Report to update leakage assessment program (TR-1116-51962)
- Update FSAR 3.8.2.7
- Update FSAR 6.2
- Update Type A Test Exemption
- Update ITAAC Table 2.1-4
- Update Table 14.3-1 to match ITAAC
- Submit responses to RAI 9474, Questions 06.02.06-22 through 06.02.06-26 9
PM-0718-61172 Revision: O Copyright 2018 by NuScale Power, LLC.
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