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LLC Submittal of Presentation Materials Entitled, ACRS Presentation Chapter 8 Overview, for Use During a Public Meeting on June 6, 2018
	ML18156A126
Person / Time
Site:	NuScale
Issue date:	06/01/2018
From:	Wike J; NuScale
To:	; Document Control Desk, Office of New Reactors
References
	L0-0518-60242
	Download: ML18156A126 (26)
	v • d • e

.:f**~*.

NuScA'

- - POWER LE L0-0518-60242 June 1, 2018 Docket No.52-048 U.S. Nuclear Regulatory Commission ATTN: Document Control Desk One White Flint North 11555 Rockville Pike Rockville, MD 20852-2738

SUBJECT:

NuScale Power, LLC Submittal of Presentation Materials Entitled , "ACRS Presentation Chapter 8 Overview," for Use During a Public Meeting on June 6, 2018 The purpose of this submittal is to provide presentation materials for use during the upcoming Advisory Committee on Reactor Safeguards (ACRS) NuScale Subcommittee meeting on the safety evaluation for Chapter 8, Electrical Power, of the NuScale design certification application .

Enclosure 1 is the nonproprietary presentation entitled "ACRS Presentation Chapter 8 Overview."

This letter makes no regulatory commitments and no revisions to any existing regulatory commitments .

If you have any questions, please contact Paul lnfanger at 541-452-7351 or at pinfanger@nuscalepower.com .

Manager, Licensing NuScale Power, LLC Distribution : Frank Akstulewicz, NRC, OWFN-8H4A Michael Snodderly, NRC, TWFN-2E26 Gregory Cranston , NRC, OWFN-8G9A Samuel Lee, NRC, OWFN-8G9A Omid Tabatabai. NRC, TWFN-8G9A Enclosure 1: ACRS Presentation Chapter 8 Overview, PM-0618-60190-NP NuScale Power, LLC 1100 NE Circle Blvd ., Suite 200 Corvallis, Oregon 97330 Office 541 .360-0500 Fax 541.207.3928 www.nuscalepower.com

.:~--~*.. N USCATULE

- - *** POWER L0-0518-60242 :

ACRS Presentation Chapter 8 Overview, PM-0618-60190-NP NuScale Power, LLC 1100 NE Circle Blvd ., Suite 200 Corvallis, Oregon 97330 Office 541 .360-0500 Fax 541 .207.3928 www.nuscalepower.com

NuScale Nonproprietary ACRS Presentation

____Chapter 8 Overview Ted Hough Electrical Design Kent Welter Nuclear Safety Jeff Ehlers Electrical Design Paul lnfanger Licensing June 6, 2018 PM-061 8-60 190-N P :*

NUSCALE Revision: O Copyright 2018 by NuScale Power, LLC. **;. .: POWER-Template # : 0000-21727-F01 R3

Abbreviations

AAPS - alternate AC power supply

AC - alternating current

BOG - backup diesel generator

BPSS - backup power supply system

CFDS - containment flooding and drain system

COA - condition of applicability

CHWS - chilled water system

CNV - containment vessel

CVCS - chemical and volume control system

CW - circulating water

DC - direct current

DCA - design certification application

ECCS - emergency core cooling system

EONS - normal DC power system

EDSS - highly reliable DC power system

EHVS - electrical high voltage system 2

Abbreviations

ELVS - electrical low voltage system

. EMVS - electrical medium voltage system

FSAR - final safety analysis report

HP- horsepower

LTR - licensing topical report

MCR - main control room

MCS - module control system

MPS - module protection system

MPT - main power transformer

MS - module specific

NMS - neutron monitoring system

OPS - operations

PAM - post accident monitoring

PCS - plant control system

PLS - plant lighting system

PPS - plant protection system

PZR - pressurizer 3

Abbreviations

RAI - request for additional information

RG - regulatory guide

RT - reactor trip

SBO - station blackout

SDIS - safety display and indication system

SER - safety evaluation report

SPS - security power system

SST - station service transformers

TG - turbine generator

UAT - unit auxiliary transformer

VRLA- valve regulated lead acid 4

Purpose

Provide an overview and highlights of the electrical systems pertinent to Chapter 8 of the NuScale DCA

- design basis

- off-site power

- on-site power (AC)

- on-site power (DC)

- station blackout

- FSAR Table 8.3-9

TR-0815-16497 "Conditions of Applicab ility"

TR-0815-16497 "NRC additional conditions" 5

Starting Point

Key influences in the overall electrical design

- nuclear safety and regulatory requ irements

- Fukushima electrical insights/dependence on power

- the robust, inherently safe module concept

- our plant mechanical design emphasizes simplicity

- design electrical systems that compliment the simplicity

- 12X factor, electrical impact regarding viability and economics 6

PM-0618-60190-N P Revision: 0 Copyright 201 8 by NuScale Power, LLC.

Design Basis

Safety-related components "fail-safe" on a loss of electrical power

- solenoids (de-energized) - valves close/open depending on function

- breakers (RT + PZR) - open

Safety-related systems rely on natural passive mechanisms based on fundamental physical and thermodynamic principles

Based upon the application of Safety Classification of Passive Nuclear Power Plant Electrical Systems, TR-0815-16497, the following are key electrical design features:

- AC and DC electrical distribution systems are classified as non-Class 1E

- highly reliable DC power system (EDSS) has augmented design ,

qualification, and QA provisions

- MCR emergency lighting and PAM B&C variables powered by EDSS

- power sources are not required to support safety-related functions

- design supports exemption to GDC 17 and 18 7

Overall Single-Line Drawing

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Off-Site Power System

The off-site power system includes the switchyard and one or more connections to a transmission grid, micro-grid, or dedicated service load.

- COLA Item (8.2-1) to describe the site-specific switchyard layout and design including off-site power connections

The passive design of the NuScale power plant does not rely on AC power and does not require an off-site power system to mitigate design-basis events.

On a loss of off-site power the plant is designed to transition to "island mode" with house load powered from the designated TG unit.

On-Site AC Power

Use of standardized industrial AC electrical distribution equipment

Support online electrical bus outages with multiple modules in service (e.g., transformer capacities, short circuit ratings, etc.) _

Electrical distribution levels

- EHVS - 13.8kV (main generators, MPTs, buses)

- one generator can power entire 12-module house load

- normal AC power source to on-site loads

- EMVS-4160V (UATs, buses)

On-Site AC Power

ELVS - 480V (SSTs, buses)

- station service transformers (main-tie-main configuration)

module-specific and lower HP shared loads

PLS - 480V, 277V, 208V, and 120V

- plant lighting loads and misc. power panel loads

BPSS

- auto start on loss of all AC to 13.BkV buses (30-second time delay), manually loaded

backup diesel generators (BDGs - 480V)

- support selected plant loads (battery chargers, control room ventilation ,

eves pumps, eFDS pumps) 12 PM-0618-60190-NP ~ . NUSCALE Revision : O Copyright 201 8 by NuScale Power, LLC. . POWl::R-Te mp1ate #: 0000-217 27-F01 R3

On-Site AC Power

BPSS

- auxiliary AC power source (AAPS - 13.8kV)

support permanent nonsafety loads when normal AC not available

13.8kV so OPS can distribute power as needed

- portable generator connection (480V)

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On-Site DC Power

EDSS (highly reliable DC power system)

- augmented design requirements

- augmented QA requirements

- Class 1E isolation - performed by the MPS and NMS power supply components (i.e. , DC-DC converters)

- VRLA batteries

- battery duty cycle

EDSS MS Channel A & D - 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months (ECCS Hold Mode)

EDSS MS Channel B & C - 72 hours8.333333e-4 days 0.02 hours 1.190476e-4 weeks 2.7396e-5 months (PAM Support)

EDSS-C Division I & II - 72 hours8.333333e-4 days 0.02 hours 1.190476e-4 weeks 2.7396e-5 months (PAM Support) 14 PM -0618-60190-N P Revision: O Copyright 20 18 by NuScale Power, LLC.

On-Site DC Power

EDSS-125V EDSS-MS Channel A

- EDSS-MS (module specific)

not shared per RG 1.81

power to MPS and NMS

4-channel system to support 4-channel MPS and NMS

- EDSS-C (common)

shared common loads (PPS, MCR emergency lights, SDIS) 1

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On-Site DC Power

EONS - 250 VOC,125 VOC, and 208 VAC

- VRLA batteries and 40-minute battery duty cycle

- supports nonsafety loads/functions related to investment protection and power generation, for example:

nonsafety l&C (PCS and MCS)

control rod drive power supply

electrical distribution control power

TG emergency lube oil pumps 16 PM-06 18-60 190-NP *: NUSCALE Revision: O Copyright 2018 by NuScale Power, LLC . t PoWER-Temp1ate # : 0000-21727-F0 1 R3

Station Blackout

Passive plant design coping duration (SECY-94-084 and SECY-95-132)

- station blackout (72 hour8.333333e-4 days 0.02 hours 1.190476e-4 weeks 2.7396e-5 months coping duration)

- SBO analysis includes all 12 modules operating at 100% prior to the event

- all safety functions achieved and maintained for 72 hours8.333333e-4 days 0.02 hours 1.190476e-4 weeks 2.7396e-5 months without reliance on AC power or operator action (reactor trip, decay heat removal system , emergency core cooling system)

- core cooling and containment integrity maintained without AC power

- sensitivity case demonstrates core cooling and containment integrity maintained without DC power as well

Station Blackout (RPV Level) 40 24 hour2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months 35 ECCS actuation

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0 10 20 30 40 50 '60 70 Time (hr) 20 PM-0618-60190-NP atei*** NUSCALE Revision: 0 Copyright 201 8 by NuScale Power, LLC. :--.al'!. POWER-remp1ate #: 0000-21727-F0 1 R3

Electrical Topical Report Evaluation

NuScale received NRC eRAI No. 9359 on 1/29/18 requesting the addition of a table to the FSAR providing a cross reference for the "conditions of applicability" provided in the LTR and the "five conditions" identified in the associated SER

Nu Scale responded to the RAI on 3/27/18 with the addition of Table 8.3-9 (addresses COAs and SER conditions) and Table 8.3-10 (addresses augmented design provisions), which provide the required FSAR cross references for the LTR and associated SER

- as a resu lt of the FSAR cross reference evaluation , numerous conforming changes were made to the Tier 2 FSAR to enhance validation 21 PM-06 18-60 190-NP *:* *. NUSCAL E Revision: O Copyright 2018 by NuScale Power, LLC . **.;. -~* POWER-Template # : 0000-21727-F01 R3

Table 8.3-9 FSAR Cross Reference Table 8.3-9: FSAR Cross Reference for the Conditions of Applicability and NBC SER Limitations and Cond itions for TR-0815-1 6 497-P-A Table 3-1 Sectron I

~

FSAR Sections that Demonst rat e Condition is Satisfied

,~rndi112a ~umbec I

.L Design Basis Event Assumptions

. 15 Q Q 6 ~ and 15 Q 4 !Z2 bom stabilized 1::ondition DBE end state wi!bout opecatoc act;ons ceguiced>

. 15 Q Q 6 5 !DBE aaal:i:sis in,ludes IQss Qf ele1::tci1::al P!lwec> I

. B4 2 (SBQ Loss Qf A' and DC PQlOr'.ec foe Z2 b!lYC ducatjQn)

Ii" La.. . 3 2 4 CCBQS dQes nQt cel:i: Qn electci,al c.owecl

. 8.4.2 (SBO reactor trig}

1.b. . 4.3.1.5 {Shutdown cagabilitv does not rel:i: on electrical QQWer}

. 15.6 {Decrease in inventoQ:' event anal~ses do not rel~ on electri~al Rower or credit active injection sources)

. B4 2 !SBQ does D!lt cel:i: Qn eleoa,al c.owec foe sbutd!lwn oc ;nventQQ! 1::ontc!lll

.Ll:... . 5: 4 3 1 (Pl:lBS functiQn does nQt cel:i: on electch:al c.owerl

. 6 3 l (ECCS functi!ln does not ceJ:i: on electa,al power}

. 15 ao6 3 (DBE anal:i:sis does not ,cedit elect:ri,al c.owec file Pl::IBS oc E,,s functions}

. !able l 5 0-2 !able l 5 0:3 !able l 5 0::1 (Euel and ,ace a"eptaa,e ,citeaa 1::onficm rnce rnolinal

. B4 2 (SBQ ,ace 1::oolina celies on Pl:lBS and E,,s1 1.d. . 6.2.4.2.1 {CNV isolation function does not rell on electrical QQWer}

. 8.4.3 {SBO containment integri!l! does not rell on electrical i;iower}

- 1.e. . 6.2.1, 6.2.2, and 6.2.5.1. (Passive CNTS and UHS design does not include active ESF heat removal and combustible gas control s~stems)

. !able l 5 Q-2 (DBEtbecmal b:i:dcauli, a"eptan,e ,c;tec;a 1::onficm 1::onta;nment peak pcessuce macainl

. B4 3 (~o ,cedit foe active ESE beat cemoval foe 1::Qntainment inteacit:i: ;n SBQ anal:i:sisl il. . 6 5 3 (Acti:i:e fissiQn pcoduct cemQval s:i:stems ace not ceguicedl

. Iable l 5 0-l 2 (DBA cadi!lloai,al i::onseguen,es sbow guidelines maintained>

Lg,

- . 5.2.2. 1 (Ovemressure i;irotection Slstem does not rell on electrical QQwer} -

. 8.4.2 (SBO RPV i;iressure margin}

. Table 15.0-2 (DBE thermal hldraulic anallses confi rm margin to RCS i;iressure

Template #: 0000-2 1727-F0 1 R3

Conclusion

The electrical distribution system supports the application of Safety Classification of Passive Nuclear Power Plant Electrical Systems,TR-0815-16497

The electrical distribution system is not required to support any safety-related function or manual operator action (no RG 1.97 Type A variables), and thus is classified as non-Class 1E

Backup power sources (BDGs, AAPS) are available for asset protection , designated plant loads, and black start

The electrical distribution system has flexibility to support bus outages with multiple modules in service

The design supports exemption to GDC 17 and 18 23 PM-0618-60190-NP *;* *:* NUSCALE Revision: O Copyright 2018 by NuScale Power, LLC. ...:. .:* POWE::R..

Template#: 0000-21727-F01 R3

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