B •w babcock & wilcox nuclear power generation B 800 main street 0 iynchburg, va 24504 b phone 434.522.6800 0 fax 434.522.6837 P www.babcockcorn July 16, 2009 U.S. Nuclear Regulatory Commission ATTN: Document Control Desk One White Flint North 11555 Rockville Pike Rockville, MD 20852-2738 SUBJECT: Non-Proprietary Slides for B&W mPowerTM Modular Reactor Approach to Reactivity. REFERENCE: B&W Transmittal letter dated July 6, 2009. The B&W Nuclear Power Generation Group met with the NRC staff on July 7 th 2009 in a closed meeting to discuss the reactivity control approach for the B&W mPowerTM Reactor. During that meeting, and in the referenced letter, B&W committed to providing a redacted, non-proprietary version of the presentation. The attached sets of slides are provided as non-proprietary and releasable to the public without restriction. Questions concerning this submittal may be directed to Jeff Halfinger at (434) 522-5941. (Email: iahalfinqerbabcock.com). .def alfingter JAH/jlr cc: Thomas J. Kenyon, NRC, TWFN-6 C34 William D. Reckley, NRC, TWFN-6 C34 qC-)OI babcock & wilcox nuclear power generation group, inc., a Babcock & Wilcox company L . s) o iLocL H O oLjv '
Transcript
B •w babcock & wilcox nuclear power generationB 800 main street 0 iynchburg, va 24504 b phone 434.522.6800
0 fax 434.522.6837 P www.babcockcorn
July 16, 2009
U.S. Nuclear Regulatory CommissionATTN: Document Control DeskOne White Flint North11555 Rockville PikeRockville, MD 20852-2738
SUBJECT: Non-Proprietary Slides for B&W mPowerTM Modular Reactor Approach to Reactivity.
REFERENCE: B&W Transmittal letter dated July 6, 2009.
The B&W Nuclear Power Generation Group met with the NRC staff on July 7 th 2009 in a closed meeting todiscuss the reactivity control approach for the B&W mPowerTM Reactor. During that meeting, and in thereferenced letter, B&W committed to providing a redacted, non-proprietary version of the presentation.
The attached sets of slides are provided as non-proprietary and releasable to the public without restriction.
Questions concerning this submittal may be directed to Jeff Halfinger at (434) 522-5941.(Email: iahalfinqerbabcock.com).
.def alfingter
JAH/jlr
cc: Thomas J. Kenyon, NRC, TWFN-6 C34William D. Reckley, NRC, TWFN-6 C34
qC-)OI
babcock & wilcox nuclear power generation group, inc., a Babcock & Wilcox company L .
s) o iLocL H O oLjv '
m pr ve eerg ý. TM~a pro gressiv7e energy soluti'on Redacted Version
O
nuclear power generation
Modular Reactor Approach toReactivity Control
July 7, 2009 NRC Pre=Application Review
Redacted material marked with square brackets and noted by[CCI per Affidavit 4(a)-(d)]
a Babcock & Wilcox company
mpower babcock & wilcox nuclear power cgeneration
Presentation Outline* Introduction
* B&W mPower safety design features
[CCI per Affidavit 4(a)-(d)]
m Reactivity control approach
* Regulatory requirements for reactivity control, General Design Criteria 26, 27, and 29, Anticipated Transients Without Scram (ATWS) /7
babcock & wilcox nuclear power generationl~b.a progressive energy solution
[CCI per Affidavit 4(a)-(d)] -I(D20 h abok&Wlo Com............ .- Alihsrsre.1
d•AI'fl• oW er babcock & wilcox nuclear power generation........ . clerio wrtin ra io
a progressive energy souton
[CCI per Affidavit 4(a)-(d)] J7@ 09TeBboc sicxCmpn.Alrgtsrsre.1
aIProesiv e ryf' babcock & wilcox nuclear power generationa ProCgressive energy 4()-utdon
[CCI per Affidavit 4(a)-(d)] J2@20 h acc&Wlo Co.. . . . y. . . ..rghseere
d m~f wE,'L babcock & wilcox nuclear power generationa progressive energy solution
[CCI per Affidavit 4(a)-(d)]
@ 09TeBboc icxCmpn.Alrgtsrsre.1
aProseert babcock.& wilcox nuclear power generationa progressiv[eenerfgysolUtton
[CCI per Affidavit 4(a)-(d)] ~220 9 Te abock&. . lox. .man. . . ..ihtrsrvd
a"nProsWer7 babcock & wilcox nuclear power generationa progressi ve energy soiution
Reactivity Control Regulatory Requirements
*General Design Criteria0 GDC 26 - Two independent reactivity control systems
o GDC 27 - Capable of reliably controlling reactivity changes
, GDC 29 - Highly reliable capability of performing safety function
*10 CFR 50.62 reduction in risk from anticipated transientswithout scram (ATWS)
I @ 2009 Th~~e Babcck..... cx..op..yA.l..gh..resrve.. .5
a prog~ressive engrgys.dl~uin babcock & wilcox nuclear power generation
General Design Criterion 26
Two independent reactivity control systems of different design principlesshall be provided. One of the systems shall use control rods, preferablyincluding a positive means for inserting the rods, and shall be capable ofreliably controlling reactivity changes to assure that under conditions ofnormal operation, including anticipated operational occurrences, and withappropriate margin for malfunctions such as stuck rods, specifiedacceptable fuel design limits are not exceeded. The second reactivitycontrol system shall be capable of reliably controlling the rate of reactivitychanges resulting from planned, normal power changes (including xenonburnout) to assure acceptable fuel design limits are not exceeded. One ofthe systems. shall be capable of holding the reactor core subcritical undercold conditions.
Q 209TeBbok&WicxCmayAlrihsrsre.1
I1Pe babcock & wilcox nuclear power generationa progressive energy soiunon
arog'rXsiv e__••t babcock &,wilcox nuclear power generationa progressive energy solution
General Design Criterion 27
The reactivity control systems shall be designed to have acombined capability, in conjunction with poison addition by theemergency core cooling system, of reliably controllingreactivity changes to assure that under postulated accidentconditions and with appropriate margin for stuck rods thecapability to cool the core is maintained.
@ 00 The Bbok&Wlo opn. lihsrsre.1
,•I'POF#V i'~fJ babcock & wilcox nuclear power generationa progressive energy solution
[CCI per Affidavit 4(a)-(d)] 7S@200 Th Bacok &Wilox ompnyAllrigts.eseve...9
aprogWsivee er'I babcock & wilcox nuclear power generationMb.a prog'ressi'v-e ýe~n'e-gyls'olutilon
General Design Criterion 29
The protection and reactivity control systems shall be designedto assure an extremely high probability of accomplishing theirsafety functions in the event of anticipated operationaloccurrences.
200 Th............ Bacc icxCmay l ihsrsre.2
a rogfressve energy solution
C000o
babcock & wilcox nuclear power generation
K [CCI per Affidavit 4(a)-(d)] 7Q 2009 The Babcock & Wilcox Company. All rights reserved.
e babcock & wilcox nuclear power generationa progressive energy solution
10 CFR 50.62 -ATWS* (c)(1) PWRs must have independent, diverse, reliable equipment for
auxiliary feedwater initiation and turbine trip upon indication of an ATWS
[Privileged information per Affidavit 6(b)]
I @ 2009 Th~e Babcok.&. Wlcox.om......................d-2
t-IIIPQ}'eIP babcock & wilcox nuclear power generationa progressive energy sdlution
10 CFR 50.62 -ATWS(c)(2) pressurized water reactors manufactured by... Babcock andWilcox must have a diverse, independent, reliable scram system.
[CCI per Affidavit 4(a)-(d)]
I (D 2009 Th~~~eBabock.......... pan....... htsresrv... .3
1 jh l-lIJ 44 e babcock & wilcox nuclear power generation
Summary
[CCI per Affidavit 4(a)-(d)]
" Reactivity control system has diverse, independent,reliable scram systems and meets the requirementsfor ATWS
" B&W mPower design fully complies with GeneralDesign Criteria 26, 27, and 29
" Design assures the capability to cool the core underpostulated accident conditions
" Design provides a highly reliable and passiveapproach to safety
