ML18193B168
| ML18193B168 | |
| Person / Time | |
|---|---|
| Site: | NuScale |
| Issue date: | 07/12/2018 |
| From: | Rad Z NuScale |
| To: | Document Control Desk, Office of New Reactors |
| References | |
| LO-0718-60865 | |
| Download: ML18193B168 (4) | |
Text
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.. NU SCALE
.:. POWER' July 12, 2018 U.S. Nuclear Regulatory Commission ATTN: Document Control Desk One White Flint North 11555 Rockville Pike Rockville, MD 20852-2738 LO-0718-60865 Docket No.52-048
SUBJECT:
NuScale Power, LLC Submittal of Changes to Final Safety Analysis Report, Section 7.0.4.1, Module Protection System, and Figure 7.0-2, Module Protection System Boundaries
REFERENCES:
Letter from NuScale Power, LLC to Nuclear Regulatory Commission, "Nu Scale Power, LLC Submittal of the NuScale Standard Plant Design Certification Application, Revision 1," dated March 15, 2018 (ML18086A090)
During a public teleconference with NRC staff on June 25, 2018, NuScale Power, LLC (NuScale) discussed potential updates to the Final Safety Analysis Report (FSAR) to clarify the description of the 24 hour2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> timers that are part of the module protection system. As a result of this discussion, NuScale revised FSAR section 7.0.4.1, "Module Protection System," and Figure 7.0-2, "Module Protection System Boundaries."
The Enclosure to this letter provides a mark-up of the FSAR pages incorporating revisions to section 7.0.4.1 and Figure 7.0-2 in redline/strikeout format. NuScale will include this change as part of a future revision to the NuScale Design Certification Application.
This letter makes no regulatory commitments or revisions to any existing regulatory commitments.
Please feel free to contact Paul lnfanger at 541-452-7351 or at pinfanger@nuscalepower.com if you have any questions.
Sincerely,
~~
/4;;;;~--Rad Director, Regulatory Affairs NuScale Power, LLC Distribution: Samuel Lee, NRC, OWFN-8G9A Gregory Cranston, NRC, OWFN-8G9A Omid Tabatabai, NRC, OWFN-8G9A
Enclosure:
"Changes to NuScale Final Safety Analysis Report Section 7.0.4.1, "Module Protection System," and Figure 7.0-2, "Module Protection System Boundaries" NuScale Power, LLC 1100 NE Circle Blvd, Suite 200 Corvallis, Oregon 97330 Office 541.360-0500 Fax 541.207.3928 www.nuscalepower.com
LO-0718-60865 NuScale Power, LLC 1100 NE Circle Blvd., Suite 200 Corvallis, Oregon 97330 Office 541.360-0500 Fax 541.207.3928 www.nuscalepower.com
Enclosure:
Changes to NuScale Final Safety Analysis Report Sections Section 7.0.4.1, Module Protection System, and Figure 7.0-2, Module Protection System Boundaries.
NuScale Final Safety Analysis Report Instrumentation and Controls - Introduction and Overview Tier 2 7.0-3 Draft Revision 2 mitigates damage to the reactor core and reactor coolant system components and ensures containment integrity. The ESFAS functions are summarized in Table 7.1-4 The MPS also transmits status and information signals to the nonsafety-related MCS, maintenance workstation (MWS), and SDIS, and performs monitoring for post-accident monitoring (PAM) functionality.
RAI 07.0.DSRS-1, RAI 07.0.DSRS-2, RAI 07.0.DSRS-3, RAI 07.0.DSRS-4, RAI 07.0.DSRS-5, RAI 07.0.DSRS-6 The MPS is built on the highly integrated protection system platform (See TR-1015-18653-P-A), which is a field programmable gate array (FPGA)-based system.
The MPS incorporates the fundamental I&C design principles of independence, redundancy, predictability and repeatability, and diversity and defense-in-depth as used by TR-1015-18653-P-A. The information in this section satisfies the application specific information requirements in TR-1015-18653-P-A listed in Table 7.0-2 for application specific action item (ASAI) numbers 2, 18 and 57. There are no deviations in the application specific NuScale I&C architecture presented in this Chapter from what is described and approved in TR-1015-18653-P-A.
The MPS includes the following safety-related (except where noted otherwise) elements:
separation group sensor electronics and input panels four separation groups of signal conditioning four separation groups of trip determination manual actuation switches in the main control room main control room isolation switches in the remote shutdown station Class 1E components to provide isolation from the nonsafety-related highly reliable DC power system (EDSS) power supply power supplies for sensors and MPS components, which also provide isolation from the nonsafety-related EDSS eight voltage sensors for detecting loss of 480 VAC to the EDSS battery chargers four reactor trip breakers and associated cabling four pressurizer heater trip breakers and associated cabling two nonsafety-related MWSs two nonsafety-related MPS gateways three nonsafety-related 24-hour timers per division for PAM-only mode two divisions of RTS voting and actuation equipment (see Section 7.0.4.1.2) two divisions of ESFAS voting and actuation equipment (see Section 7.0.4.1.3)four under-the-bioshield temperature sensors The MPS boundary extends from the output connections of the sensors and detectors to the input connections of the actuated components as shown in Figure 7.0-2.
NuScale Final Safety Analysis Report Instrumentation and Controls - Introduction and Overview Tier 2 7.0-42 Draft Revision 2 Figure 7.0-2: Module Protection System Boundaries 6HQVRU
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