ML23317A414
| ML23317A414 | |
| Person / Time | |
|---|---|
| Site: | 99902078 |
| Issue date: | 11/11/2023 |
| From: | NRC |
| To: | NRC/NRR/DNRL/NRLB |
| References | |
| Download: ML23317A414 (5) | |
Text
From:
Getachew Tesfaye Sent:
Saturday, November 11, 2023 10:18 AM To:
Request for Additional Information Cc:
Thomas Hayden; Mahmoud Jardaneh; Griffith, Thomas; Osborn, Jim; NuScale-SDA-720RAIsPEm Resource
Subject:
NuScale SDAA Section 9.5.3 - Request for Additional Information No. 009 (RAI-10106-R1)
Attachments:
SECTION 9.5.3 - RAI-10106-R1-FINAL.pdf Attached please find NRC staffs request for additional information (RAI) concerning the review of NuScale Standard Design Approval Application for its US460 standard plant design (Agencywide Documents Access and Management System (ADAMS) Accession No. ML222339A066).
Please submit your technically correct and complete response by the agreed upon date to the NRC Document Control Desk.
If you have any questions, please do not hesitate to contact me.
Thank you, Getachew Tesfaye (He/Him)
Senior Project Manager NRC/NRR/DNRL/NRLB 301-415-8013
Hearing Identifier:
NuScale_SDA720_RAI_Public Email Number:
17 Mail Envelope Properties (DM6PR09MB5686657E52507208B9F0C56C8CADA)
Subject:
NuScale SDAA Section 9.5.3 - Request for Additional Information No. 009 (RAI-10106-R1)
Sent Date:
11/11/2023 10:17:33 AM Received Date:
11/11/2023 10:17:37 AM From:
Getachew Tesfaye Created By:
Getachew.Tesfaye@nrc.gov Recipients:
"Thomas Hayden" <Thomas.Hayden@nrc.gov>
Tracking Status: None "Mahmoud Jardaneh" <Mahmoud.Jardaneh@nrc.gov>
Tracking Status: None "Griffith, Thomas" <tgriffith@nuscalepower.com>
Tracking Status: None "Osborn, Jim" <josborn@nuscalepower.com>
Tracking Status: None "NuScale-SDA-720RAIsPEm Resource"
<NuScale-SDA-720RAIsPEm.Resource@usnrc.onmicrosoft.com>
Tracking Status: None "Request for Additional Information" <RAI@nuscalepower.com>
Tracking Status: None Post Office:
DM6PR09MB5686.namprd09.prod.outlook.com Files Size Date & Time MESSAGE 585 11/11/2023 10:17:37 AM SECTION 9.5.3 - RAI-10106-R1-FINAL.pdf 170510 Options Priority:
Normal Return Notification:
No Reply Requested:
No Sensitivity:
Normal Expiration Date:
1 REQUEST FOR ADDITIONAL INFORMATION No. 009 (RAI-10106-R1)
BY THE OFFICE OF NUCLEAR REACTOR REGULATION NUSCALE STANDARD DESIGN APPROVAL APPLICATION DOCKET NO. 05200050 CHAPTER 9, AUXILIARY SYSTEMS SECTION 9.5.3, LIGHTING SYSTEMS ISSUE DATE: 11/11/2023
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Background===
By letter dated December 15, 2022, NuScale Power, LLC (NuScale or the applicant),
submittedPart 2, Final Safety Analysis Report, (FSAR), Chapter 9, Auxiliary Systems, Revision 0 (Agencywide Documents Access and Management System Accession No. ML22364A281) of the NuScale Standard Design Approval Application (SDAA) for its US460 standard plant design. The NRC staff reviewed the information on the lighting systems in SDAA FSAR section 9.5.3, Lighting Systems, and determined that additional information is required to complete its review.
Question 9.5.3-1 REGULATORY BASIS There are no general design criteria or other requirements that directly apply to the normal and emergency or supplementary plant lighting systems. However, 10 CFR 50.34(f)(2)(iii) states that an application shall provide a control room design that reflects state-of-the-art, human-factor principles before committing to the fabrication or revision of fabricated control room panels and layouts. A control room design includes lighting for operators to perform actions, and NUREG-0700 provides detailed acceptance criteria for human factors engineering design attributes, including lighting.
NUREG-0800, section 9.5.3, Lighting Systems recommends that the lighting systems have adequate illumination levels and conform to the illumination levels recommended in NUREG-0700, Human System Interface Design Review Guidelines, Revision 3.
ISSUE NuScale SDAA FSAR section 9.5.3.2.3, Normal and Emergency Main Control Room Lighting, states:
The MCR lighting system provides artificial illumination under operating, maintenance, testing, and emergency conditions. Normal and emergency illumination levels are in accordance with the applicable lighting levels for a computer-based control room specified in NUREG-0700, Revision 3. Two divisions of the common augmented direct current power system, described in Section 8.3.2, Direct Current Power Systems, provide power to the light fixtures in the MCR. In the event of a loss of normal AC power, the common augmented direct current power system batteries supply power to the MCR lights. The batteries are capable of maintaining the MCR emergency lighting at an average illumination level of 10 foot-candles at workstations in the main operating area for a minimum of 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br />.
2 NUREG-0700, Revision 3, section 12.1.2.3-1, General Illumination Levels, recommends 1) an overall general illuminance levels on worksurfaces in the control room where paperwork is required should be in the range of 200-750 lux (18.6-69.7 foot-candles (fc)), and 2) if visual display devices are used at the workstation, as in computer-based control rooms, the maximum illuminance should be 500 lux (46.5 fc). In addition, NUREG-0700, Revision 3, Table 12.1, Nominal Illumination Levels For Various Tasks And Work Areas, provides illumination levels for tasks and work areas in the control room including an illuminance of 100 fc (1080 lux) for seated operator stations, handwritten reading, writing and data recording in the control room.
In NuScale SDAA FSAR section 9.5.3.2.3, it appears that NuScale does not discuss 1) the illuminance levels for the MCR normal lighting system under operating, maintenance, and testing conditions, and 2) if the batteries supply power to the MCR normal and emergency lighting systems under operating, maintenance, testing, and emergency conditions.
INFORMATION REQUESTED a-Provide the illumination levels for the MCR normal lighting system for the tasks and work areas that are provided in NUREG-0700, Revision 3, section 12.1.2.3-1 and Table 12.1 under the operating, maintenance, and testing conditions. If the illumination levels for MCR normal lighting fixtures for the tasks and work areas in the MCR are not consistent with the illumination levels provided in NUREG-0700, Revision 3, section 12.1.2.3-1 and Table 12.1, explain how the MCR normal lighting system conforms to the applicable lighting levels for a computer-based control room specified in NUREG-0700, Revision 3, during normal operations.
b-Clarify if both the MCR normal and emergency lighting fixtures are powered by the two divisions of the common augmented direct current power system under operating, maintenance, testing, and emergency conditions.
Question 9.5.3-2 REGULATORY BASIS There are no general design criteria or other requirements that directly apply to the normal and emergency or supplementary plant lighting systems.
NUREG-0800, section 9.5.3, recommends that the lighting systems provide adequate emergency lighting in all areas, required for firefighting, control and maintenance of equipment used for implementing safe shutdown of the plant during all plant operating conditions, and the access routes to and from these areas.
ISSUE NuScale SDAA FSAR section 9.5.3.2.2, Emergency Lighting System, discusses the emergency lighting fixtures outside of the MCR that are provided for existing areas and for supporting fire suppression actions and safe shutdown operation during SBO events.
However, it appears that NuScale SDAA, section 9.5.3.2.2 does not discuss emergency operating light fixtures in areas needed for control and maintenance of safe shutdown equipment outside of the MCR during other conditions of the plant (e.g., accident conditions).
3 INFORMATION REQUESTED Clarify if NuScale requires emergency light fixtures in areas needed for control and maintenance of safe shutdown equipment outside of the MCR during other plant operating conditions such as transients and accident conditions and provide the illumination levels for the emergency lighting in those areas. If not, please explain why not or provide justification for not needing emergency light fixtures in those areas.
Question 9.5.3-3 REGULATORY BASIS There are no general design criteria or other requirements that directly apply to the normal and emergency or supplementary plant lighting systems.
NUREG-0800, section 9.5.3 recommends that the lighting systems have adequate illumination levels conform to the illumination levels recommended in NUREG-0700.
NUREG-0700, Revision 3, Table 12.8, Range of Recommended Illuminances, provides illumination levels for the normal lighting in inspection/ assembly and in-plant areas.
ISSUE In SDAA FSAR section 9.5.3, NuScale states that the plant illumination levels provided by the plant lighting systems are in accordance with the applicable lighting levels specified in NUREG-0700. NuScale states that the normal plant lighting provides artificial illumination for outdoor areas outside the protected area and within the owner-controlled area, and for plant buildings.
However, NuScale did not provide illumination levels for the normal lighting system in any areas of the plant.
INFORMATION REQUESTED Clarify if the normal plant lighting system outside of the MCR provides illumination levels that are consistent with the illumination levels in the inspection/assembly and in-plant areas identified in NUREG-0700, Revision 3, Table 12.8. If not, provide the illumination levels for the normal lighting in inspection/ assembly and in-plant areas listed in Table 12.8, and explain how NuScale meets NUREG-0700, Revision 3, with respect to illumination levels for the normal lighting in those areas.