ML20199M421
| ML20199M421 | |
| Person / Time | |
|---|---|
| Site: | 99900003 |
| Issue date: | 07/17/2020 |
| From: | NRC |
| To: | NRC/NRR/DNRL/NRLB |
| References | |
| Download: ML20199M421 (5) | |
Text
From: Franovich, Rani Sent: Friday, July 17, 2020 10:46 PM To: GEH-BWRX-300RAIsPEm Resource Cc: GEH.RAI@ge.com
Subject:
RE: Request for Additional Information Letter No. 011 (RAI 9765)
Attachments: Letter 11 RAI_9765 Public.pdf Rani Rani Franovich NuScale Design Certification GE-Hitachi BWRX-300 Design Review
Hearing Identifier: GEH_BWRX300_RAIs_Public Email Number: 9 Mail Envelope Properties (BY5PR09MB4358ADAA5D09A6D693FE1E7E8F7D0)
Subject:
RE: Request for Additional Information Letter No. 011 (RAI 9765)
Sent Date: 7/17/2020 10:45:57 PM Received Date: 7/17/2020 10:45:58 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 111 7/17/2020 10:45:58 PM image002.jpg 13195 image004.png 28064 Letter 11 RAI_9765 Public.pdf 119467 Options Priority: Normal Return Notification: No Reply Requested: No Sensitivity: Normal Expiration Date:
Request for Additional Information Letter No. 011 (RAI 9765)
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 06.02.01-2 Containment Subcompartments In GEH Licensing Topical Report (TR), "BWRX-300 Containment Performance (NEDC-33911P, Revision 0)," the applicant stated that, "The BWRX-300 design does not include any subcompartments with large bore high energy lines that would limit the flow of fluid to the containment in the event of a pipe rupture." The report states that subcompartment pressurization and acoustic loads resulting from pipe breaks in subcompartments for the purposes of structural integrity do not apply to the BWRX-300 containment. The applicant concluded that subcompartments are used in the model only to the extent to calculate containment atmosphere mixing, and that the acceptance criteria associated with SRP Section 6.2.1.2, "Subcompartment Analysis," are met without the need for specific analyses for the BWRX-300 design.
The staff notes that the BWRX-300 containment design is at a conceptual stage and considers the volume below the RPV, the space between RPV and the biological shield, and the containment head area above the refueling bellows, as sub-compartments. For the staff to conclude that subcompartment pressurization does not apply to the BWRX-300 containment, the applicant would need to justify that requirements in General Design Criteria (GDC) 4 and GDC 50 are met for the actual subcompartments functional design by showing that no significant pressure differentials are created across the subcompartment walls under the postulated DBAs caused by line breaks both inside or outside the subcompartments. Therefore, the staff requests the applicant to discuss how the BWRX-300 containment subcompartments meet the regulations and provide a statement of compliance and the related design methodology development in the TR.