ML17252B630

SMR DC RAI - Request for Additional Information No. 218, RAI 9054 (9.5.4)

ML17252B630
Person / Time
Site:	NuScale
Issue date:	09/09/2017
From:	NRC
To:	NRC/NRO/DNRL/LB1
References
Download: ML17252B630 (3)

Text

NuScaleDCRaisPEm Resource From: Cranston, Gregory Sent: Saturday, September 09, 2017 5:00 PM To: RAI@nuscalepower.com Cc: NuScaleDCRaisPEm Resource; Lee, Samuel; Chowdhury, Prosanta; Dias, Antonio; Dinh, Thinh; Markley, Anthony

Subject:

RE: Request for Additional Information No. 218, RAI 9054 (9.5.4)

Attachments: Request for Additional Information No. 218 (eRAI No. 9054).pdf Attached please find NRC staffs request for additional information concerning review of the NuScale Design Certification Application.

Please submit your technically correct and complete response within 60 days of the date of this RAI to the NRC Document Control Desk.

If you have any questions, please contact me.

Thank you.

Gregory Cranston, Senior Project Manager Licensing Branch 1 (NuScale)

Division of New Reactor Licensing Office of New Reactors U.S. Nuclear Regulatory Commission 301-415-0546 1

Hearing Identifier: NuScale_SMR_DC_RAI_Public Email Number: 241 Mail Envelope Properties (d556454c79714d9ea00ff6bc5e777650)

Subject:

RE: Request for Additional Information No. 218, RAI 9054 (9.5.4)

Sent Date: 9/9/2017 4:59:52 PM Received Date: 9/9/2017 4:59:56 PM From: Cranston, Gregory Created By: Gregory.Cranston@nrc.gov Recipients:

"NuScaleDCRaisPEm Resource" <NuScaleDCRaisPEm.Resource@nrc.gov>

Tracking Status: None "Lee, Samuel" <Samuel.Lee@nrc.gov>

Tracking Status: None "Chowdhury, Prosanta" <Prosanta.Chowdhury@nrc.gov>

Tracking Status: None "Dias, Antonio" <Antonio.Dias@nrc.gov>

Tracking Status: None "Dinh, Thinh" <Thinh.Dinh@nrc.gov>

Tracking Status: None "Markley, Anthony" <Anthony.Markley@nrc.gov>

Tracking Status: None "RAI@nuscalepower.com" <RAI@nuscalepower.com>

Tracking Status: None Post Office: HQPWMSMRS07.nrc.gov Files Size Date & Time MESSAGE 556 9/9/2017 4:59:56 PM Request for Additional Information No. 218 (eRAI No. 9054).pdf 88624 Options Priority: Standard Return Notification: No Reply Requested: No Sensitivity: Normal Expiration Date:

Recipients Received:

Request for Additional Information No. 218 (eRAI No. 9054)

Issue Date: 09/09/2017 Application

Title:

NuScale Standard Design Certification 048 Operating Company: NuScale Power, LLC Docket No.52-048 Review Section: 09.05.04 - Emergency Diesel Engine Fuel Oil Storage and Transfer System Application Section: 9.5.4 QUESTIONS 09.05.04-1 10 CFR 52.47(a)(2) requires that a standard design certification applicant provide a description and analysis of the structures, systems, and components (SSCs) of the facility, with emphasis upon performance requirements, the bases, with technical justification therefore, upon which these requirements have been established, and the evaluations required to show that safety functions will be accomplished.

The applicant did not provide Sections 9.5.4 through 9.5.8 in the FSAR and yet other portions of the application (e.g., Subsection 8.1.2.1) indicate the existence and use of backup diesel generators as part of the backup power supply system (BPSS) when normal AC power sources are not available, and to provide backup electrical power to selected equipment l oads.

Furthermore, Subsection 19.1.7.2, also states Results of the Multiple Module Risk Evaluation at Full Power, states that [T]here are no additional module-specific components that are found to be risk significant in the multiple module PRA than are identified as risk significant in the single module PRA. The site AC power sources, i.e., the shared backup diesel and combustion turbine generator (CTG), are risk significant because of the importance of the site-wide LOOP initiator.

Therefore, the applicant is requested to provide descriptions for the backup diesel auxiliary systems to allow NRC staff to perform an appropriate review of the emergency diesel system.