ML20100N028
| ML20100N028 | |
| Person / Time | |
|---|---|
| Site: | 99900003 |
| Issue date: | 04/09/2020 |
| From: | NRC |
| To: | NRC/NRR/DNRL/NRLB |
| References | |
| Download: ML20100N028 (6) | |
Text
From: Franovich, Rani Sent: Thursday, April 9, 2020 5:02 PM To: GEH-BWRX-300RAIsPEm Resource
Subject:
NEDC-33910P, "BWRX-300 Reactor Pressure Vessel Isolation and Overpressure Protection," Request for Additional Information 9371 Attachments: Letter 2 RAI_9731 Public.pdf Rani Rani Franovich NuScale Design Certification GE-Hitachi BWRX-300 Design Review
Hearing Identifier: GEH_BWRX300_RAIs_Public Email Number: 4 Mail Envelope Properties (BN8PR09MB3588ADC34B0866FDAB910D2D8FC10)
Subject:
NEDC-33910P, "BWRX-300 Reactor Pressure Vessel Isolation and Overpressure Protection," Request for Additional Information 9371 Sent Date: 4/9/2020 5:01:40 PM Received Date: 4/9/2020 5:01:45 PM From: Franovich, Rani Created By: Rani.Franovich@nrc.gov Recipients:
"GEH-BWRX-300RAIsPEm Resource" <GEH-BWRX-300RAIsPEm.Resource@nrc.gov>
Tracking Status: None Post Office: BN8PR09MB3588.namprd09.prod.outlook.com Files Size Date & Time MESSAGE 126 4/9/2020 5:01:45 PM Letter 2 RAI_9731 Public.pdf 170115 image001.jpg 13302 image002.png 26665 Options Priority: Normal Return Notification: No Reply Requested: No Sensitivity: Normal Expiration Date:
Request for Additional Information
Issue Date: 04/09/2020 Application
Title:
GEH BWRX-300 Topical Reports Operating Company: GE Hitachi Nuclear Energy (Wilmington, NC)
Docket No. 99900003 Review Section: 03.06.02 - Determination of Rupture Locations and Dynamic Effects Associated with the Postulated Rupture of Piping Application Section:
QUESTIONS 03.06.02-1 Section 2.2 in LTR NEDC-33910 states that for piping that have ((. The NRC staff requests that GEH describe the design of the (( }}. 03.06.02-2 Section 4.1.5 of the LTR states that for piping connected to (( }}, the BWRX-300 design requirements include consideration of the acceptance criteria to identify postulated pipe rupture locations and configurations inside containment as specified in BTP 3-4, "Postulated Rupture Locations in Fluid System Piping Inside and Outside Containment." To support the NRC staff review of NEC-33910 and its conformance to 10 CFR Part 50, Appendix A, GDC 4 related to protection against postulated breaks, the NRC staff reuests the following: (a) That GEH clarify whether a terminal end break would be postulated at the piping connection to the (( }}. (b) If a piping terminal break is postulated, that GEH describe how the BWRX-300 design requirements will provide assurance that the functionality of the (( }} will not be affected by the dynamic effects resulting from the postulated terminal end break. (c) If breaks are not postulated at those piping connection terminal ends, that GEH describe how the BWRX-300 design provides reasonable assurance that the probability of postulated failures at those connection terminal ends is extremely low. 03.06.02-3
Section 2.4.1 of the LTR states that the bolted flange connections of the (( }}. GEH also states that the design provisions, the leakage detection systems design, and the inservice inspection requirements demonstrate that the probability of gross rupture at these (( }} is extremely low. To support the NRC staff review of NEC-33910 and its conformance to 10 CFR Part 50, Appendix A, GDC 4 related to protection against postulated breaks, the NRC staff requests that GEH indicate the material of construction for these (( }} and discuss why the potential failure mechanisms, such as vibration, water hammer, corrosion, and unexpected modes of operation, are not applicable for these (( }}.}}