ML20199M420
| ML20199M420 | |
| Person / Time | |
|---|---|
| Site: | 99900003 |
| Issue date: | 07/17/2020 |
| From: | NRC |
| To: | NRC/NRR/DNRL/NRLB |
| References | |
| Download: ML20199M420 (5) | |
Text
From: Franovich, Rani Sent: Friday, July 17, 2020 10:42 PM To: GEH-BWRX-300RAIsPEm Resource Cc: GEH.RAI@ge.com
Subject:
Request for Additional Information Letter No. 010 (RAI 9764)
Attachments: Letter 10 RAI_9764 Public.pdf Rani Rani Franovich NuScale Design Certification GE-Hitachi BWRX-300 Design Review
Hearing Identifier: GEH_BWRX300_RAIs_Public Email Number: 8 Mail Envelope Properties (BY5PR09MB4358BA2749C1721266EBA83E8F7D0)
Subject:
Request for Additional Information Letter No. 010 (RAI 9764)
Sent Date: 7/17/2020 10:42:13 PM Received Date: 7/17/2020 10:42:16 PM From: Franovich, Rani Created By: Rani.Franovich@nrc.gov Recipients:
"GEH.RAI@ge.com" <GEH.RAI@ge.com>
Tracking Status: None "GEH-BWRX-300RAIsPEm Resource" <GEH-BWRX-300RAIsPEm.Resource@nrc.gov>
Tracking Status: None Post Office: BY5PR09MB4358.namprd09.prod.outlook.com Files Size Date & Time MESSAGE 126 7/17/2020 10:42:16 PM image005.jpg 13228 image006.png 26591 Letter 10 RAI_9764 Public.pdf 119119 Options Priority: Normal Return Notification: No Reply Requested: No Sensitivity: Normal Expiration Date:
Request for Additional Information Letter No. 010 (RAI 9764)
Issue Date: 07/17/2020 Application
Title:
GEH BWRX-300 Topical Reports Operating Company: GE Hitachi Nuclear Energy (Wilmington, NC)
Docket No. 99900003 Review Section: 06.02.01 - Containment Functional Design Application Section:
QUESTIONS 06.02.01-1 Maximum Expected External Pressure The applicant elected to use SRP 6.2.1.1.A, "PWR Dry Containments, Including Subatmospheric Containments, Rev. 3," as the guidance and acceptance criteria for the BWRX-300 design. One of the six specific areas of review in SRP Section 6.2.1.1.A pertains to the maximum expected external pressure to which the containment may be subjected. To satisfy the requirements of General Design Criteria (GDCs) 38 and 50 of Appendix A to 10 CFR Part 50 with respect to the functional capability of the containment heat removal systems and containment structure under loss-of-coolant accident conditions, provisions would be needed to protect the containment structure against possible damage from external pressure conditions. The provisions should include conservative structural design to assure that the containment structure is capable of withstanding the maximum expected external pressure; or interlocks in the plant protection system and administrative controls preclude inadvertent operation of the containment heat removal systems. If the containment is designed to withstand the maximum expected external pressure, the external design pressure of the containment should provide an adequate margin above the maximum expected external pressure to account for uncertainties in the analysis of the postulated event. However, the applicant did not provide any information regarding the demonstration methodology/evaluation model and safety margin to satisfy the external pressure acceptance criterion in its Topical Report (TR), "BWRX-300 Containment Performance (NEDC-33911P, Revision 0). Therefore, the staff requests the applicant to discuss how its design meets GDCs 38 and 50 to assure containment functional capability of the BWRX-300 containment, and to update its TR with the necessary information demonstrating that the design meets the external pressure criterion.