11/27/2012 - updated mpower presentation slides, 'nuclear ... · e r) e t t 0 i ni systems...

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Nuclear Island System Design UpdateNovember 27t" 2012

(Redacted Version)

© 2012 Babcock & Wilcox mPower, Inc. All Rights Reserved. This document is the property of Babcock & Wilcox mPower, Inc. (B&W mPower)

This is a pre-application document and includes preliminary B&W mPower Reactor design or design supporting information and is subject to further internal review, revision, or verification.

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Agenda• Objectives" Nuclear Island (NI) Systems Overview

, Safety Strategy* Auxiliary Condenser (CNX)

' Functions, Major Components, Safety Classification

* Reactor Coolant Inventory and Purification (RCI), Functionsý Major Components, Safety Classification

• Emergency Core Cooling (ECC), Functions

Major ComponentsSafety Classification

" Discussion

0 2012 Babcock & Wilcox mPower, Inc. All rights reserved. 2

( e n• e r a trio ri

Objectives

* Provide an update on key NI systems design andfunctions

• Review systems safety strategy anddefense-in-depth

© 2012 Babcock & Wilcox mPower, Inc. All rights reserved. 3

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mPowS rNI Systems Safety Strategy

Minimieg thDroailtsadignM ini mize the probability a ndimpact of design basis accidents

Promote defense-in-depth

* Large integral NSSS* Small penetrations -[

]RCI provides high and low pressure decay heatremoval, [ I

Rely upon simple, passive safetyfeatures and capabilities

Provide protection from severeaccidents

I

© 2012 Babcock & Wilcox mPower, Inc. All rights reserved. [CCI per Affidavit 4(a)-(d)] 4a

e r) e t 0 t I

NI Systems Safety Strategy" Reactor Coolant System (RCS) design minimizes both the probability and

impact of design basis accidents

" CNX and RCI maintain RCS within safe operating envelope as first line ofdefense (defense-in-depth)

" A simple, passive safety system protects the reactor core in the eventthat conditions in RCS leave safe operating envelope

" Simple, passive features protect the lower vessel and containment in theevent of a severe accident

[

Core remains covered for all postulated accidents

S2012 Bbcock & Wilcox mPnower Inc All rights reserved At . I_. aI - J "I 5LLLI per AMiTIdaVIt '18ja-Ojdj

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Robust Defense-in-Depth Strategy[

]© 2012 Babcock & Wilcox mPower, Inc. All rights reserved. [CC1 per Affidavit 4(a)-(d)] 6

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mePower tIo

Auxiliary Condenser System (CNX)


generationCNX- Aux Condenser System

[

I@ 2012 The Babcock & Wilcox Company. All rights reserved. [CCI per Affidavit 4(a)-(d)] 8

( e rn e ra t C) I

CNX - System Overview

• High pressure decay heat removal

* Controlled decay heat removal, Hot standby condition [ I, Safe shutdown conditions [ I

© 2012 Babcock & Wilcox mPower, Inc. All rights reserved. [CCI per Affidavit 4(a)-(d)] 9

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CNX System Functions

* Safety related functionsý Containment isolation

* Non-safety functions0[

0 2012 Babcock & Wilcox mPower, Inc. All rights reserved. [CCM per Affidavit 4(a)-(d)] 10

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Major Components

Containment isolation valves

I* Air-cooled condenser

I


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Reactor Coolant Inventory and Purification System (RCl)


(J Es e a a M+++ t c) i tm ..ow.... RCI - Normal Operation

I


generationmPa wer RCI - Inventory Control

J

0 2012 Babcock & Wilcox mPower, Inc. All rights reserved. [CCI per Affidavit 4(a)-(d)] 14

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miPowsrwRCI - RHR Operation

I

© 2012 Babcock & Wilcox mPower, Inc. All rights reserved. [CCI per Affidavit 4(a)-(d)] is

generationRCI- [ Boron Injection]

]

Q 2012 Babcock & Wilcox mPower, Inc. All rights reserved. [CCI per Affidavit 4(a)-(d)] 16

c- & i e& a t i otjme rwe

RCI- System Overview

IeRCS

•RCS

purification and [ Iinventory control and chemical addition

° Decay heat removal, Normal shutdown residual heat removal

, Post 72- hr residual heat removal0 [ ]high pressure decay heat

removal

17© 2012 Babcock & Wilcox mPower, Inc. All rights reserved. [CCI per Affidavit 4(a)-(d)]

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System Functions

[


(c e n e1 rE , t i c)r

RCI Major Components

* Containment isolation valves* LTOP valves* Circulation pumps" Charging pumps* Regenerative and non-regenerative HXs" Filters• Demineralizers" Degasification - gas transfer membrane" Tanks -[ ], RCS Makeupl CRDM accumulator


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Emergency Core Cooling System (ECC)


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ECC - System Overview

" Passive safety system" Designed to provide core cooling supply for all design

basis accidents" Enhanced reliability of support systems (defense in

depth) reduces the probability of actuating ECC" Reduced number of safety-related components required

to perform required functions versus current designs" Core remains covered for all scenarios

[ ]

© 2012 Babcock & Wilcox mPower, Inc. All rights reserved. [M per Affidavit 4(a)-(d)J22

ECC Safety-Related Functions

-[

I


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ECC Major Components

" Refueling Water Storage Tank (RWST)] tank filled with demineralized water

" High-Pressure Automatic Depressurization Valves(ADVs)

, Two sets of series MOVs actuated on [I

" Low-Pressure ADVs, Four sets of series MOVs actuated on [

" Intermediate Pressure Injection Tank (IPIT)] filled with demineralized water

© 2012 Babcock & Wilcox mPower, Inc. All rights reserved. [CCI per Affidavit 4(a)-(d)]24

Cl e r1E k- t 10 -1f

Discussion


11/27/2012 - updated mpower presentation slides, 'nuclear ... · e r) e t t 0 i ni systems...

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