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-'4
gener ationI
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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generation
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
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( e n• e r a trio ri
Objectives
* Provide an update on key NI systems design andfunctions
• Review systems safety strategy anddefense-in-depth
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genera tion
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
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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
I
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generatioUn
Robust Defense-in-Depth Strategy[
]© 2012 Babcock & Wilcox mPower, Inc. All rights reserved. [CC1 per Affidavit 4(a)-(d)] 6
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(q e n r at1 t -I
mePower tIo
Auxiliary Condenser System (CNX)
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generationCNX- Aux Condenser System
[
I@ 2012 The Babcock & Wilcox Company. All rights reserved. [CCI per Affidavit 4(a)-(d)] 8
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( 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
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generation
CNX System Functions
* Safety related functionsý Containment isolation
* Non-safety functions0[
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g(JO• HO? t i 0()
Major Components
Containment isolation valves
I* Air-cooled condenser
I
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generationrl
Reactor Coolant Inventory and Purification System (RCl)
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(J Es e a a M+++ t c) i tm ..ow.... RCI - Normal Operation
I
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generationmPa wer RCI - Inventory Control
J
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ie f-0 r a 0 -iIj 10 t
miPowsrwRCI - RHR Operation
I
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generationRCI- [ Boron Injection]
]
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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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generation
System Functions
[
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(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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g e n era-t i o n
Emergency Core Cooling System (ECC)
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ECC Flow Diagram
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~1
g e n e rat i) or
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
[ ]
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ECC Safety-Related Functions
-[
I
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generation
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
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Cl e r1E k- t 10 -1f
Discussion
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