Reactor Design Overview - uxc.com Specific/mPower...Reactor Design Overview ANSI-NIST Gaithersburg, MD March 12, 2012 Matt Ales Component Design Lead Engineer The Babcock & Wilcox

Reactor Design Overview

ANSI-NIST Gaithersburg, MD

March 12, 2012 Matt Ales

Component Design Lead Engineer The Babcock & Wilcox Company

© 2012 Generation mPower LLC All rights reserved. 1

Outline

Introduction

Plant Layout

Integral Reactor Design

Safety Features

Technology Development

Codes and Standards

Lead Plant Deployment

Conclusion


Alliance between B&W and Bechtel

Risk sharing with 90/10 current ownership

300+ FTE development team

Technology and project execution

Turnkey projects = cost/schedule certainty

Broad industry engagement

Investment from 15 member Consortium

26 member Industry Advisory Council

Goal is to deploy lead plant by 2020

Industry side of public-private partnership

Platform for industry cost/risk sharing

Nebraska Electric G&T Cooperative

Hoosier Energy Rural Electric Cooperative, Inc.

Generation mPower Industry Consortium

Industry Partners

Industry Advisory Council Includes Consortium members above plus:

AEP Dayton Power & Light Duke Energy Exelon NPPD Vattenfall

Bruce Power Dominion Entergy MidAmerican Progress Energy

www.generationmpower.com

http://www.generationmpower.com/


Formal alliance between B&W Company and Bechtel Power Corporation

• Executed July 14, 2010

• Substantial commitment by B&W and Bechtel

• Platform for One-Stop Shop; Design/Licensing through Deployment

Develop and deploy, by 2020, an SMR that offers:

Lower capital cost

Schedule & cost certainty

Competitive levelized cost of electricity (LCOE)

within the constraints of:

• Proven: GEN III+, established NRC regulation

• Safe: Robust margins, passive safety

• Practical: Standard fuel, construction and O&M

• Benign: below grade, small footprint, public acceptance

A “game changer” for the nuclear power plant industry

Generation mPower LLC

© 2012 Generation mPower LLC All rights reserved. 4 .4

“Twin-pack” mPower plant configuration

Less than 40 acre site footprint

Low profile architecture

Water or air cooled condenser

Enhanced security posture

Underground containment

Underground spent fuel pool

© 2010 Babcock & Wilcox Nuclear Energy, Inc. All rights reserved. Patent Pending

The B&W mPower Nuclear Plant

Security-informed plant design


Simple solution to plant safety and O&M functions

Nuclear Island fully underground

• Lower overall seismic response

• Greater protection from external threats

Passive safety systems

• Passive Cooling – AC power not required for

safety functions

• 72-hour battery supply for monitoring/control

• No shared Safety Systems (Non-safety

systems shared where possible)

• 14-day cooling

Enhanced spent fuel pool configuration

• 20-year storage capacity

• Underground, inside protected structure

• Large heat sink, 30+ days boil-off protection

Nuclear Island Features


Nuclear Island Construction

Key Features: • Advanced Simulation software

• Prefab, preassembly,

modularization & off-site fab

• Advanced Construction

Techniques

• Automation tools

• Tightly integrated team o Construction, Engineering,

Licensing, Procurement,

Contracts, Project Controls,

Management

Integrated civil design and construction planning reduce quantities and schedule


Major Reduction in Complexity


High-Level Requirements

180 MWe Nominal output per module and 60-year plant design life

Integral reactor diameter allows readily available forgings and rail

shipment

Passive Safety Requirements – Emergency (Diesel) Power Not

Required

Minimize Primary Coolant Penetrations

Maximize Elevation of Penetrations

Large Reactor Coolant Inventory

Low Core Power Density

Standard fuel (less than 5% U235)

Long fuel cycle, 4+ year core life

Spent fuel storage on site for 20 years

No soluble boron in primary system for normal reactivity control

Conventional/off-the-shelf balance of plant systems and components

Accommodate air-cooled and water-cooled condensers

Flexible grid interface (50 Hz or 60 Hz)

Digital instrumentation and controls compliant with NRC regulations


Integral 530 MWt NSSS module

• Core, CRDMs, SG, Pressurizer, and Coolant Pumps

• No penetrations below top of core

Passively safe design philosophy

• Core remains covered during DBAs

• No active ECCS or safety-related AC power

4-Year fuel cycle with “standard” PWR fuel

• 69 fuel assemblies with <5% 235U enrichment

• Burnable poisons, no chemical shim in coolant

• Full reactivity control using Control Rod Assemblies

Modular ALWR with best of Generation III+ features … low risk, low cost and passively safe

1. Pressurizer

2. Once-Through Steam Generator

3. Feedwater Inlet / Steam Outlet

4. Reactor Coolant Pumps

5. CRDMs

6. Upper Internals

7. Reactor Core

1

2

3

4

5

6

7

B&W mPower™ Integral Reactor


Integral reactor has key features of conventional PWR

Main Steam Outlet Main Feedwater Inlet

Pressurizer

Reactor Coolant Pumps

Steam Generator

Riser

Control Rod Drive Mechanisms

Upper Reactor Vessel Internals

Control Rod Guide Frames

Core Basket

Core

Reactor Vessel

B&W mPower Integral Reactor

© 2012 Generation mPower LLC All rights reserved. 11 Secondary

Steam Generator Secondary Side

Primary

Pump

Steam Generator Riser

Reactor

Steam Generator Tubes

Upper Tubesheet

Lower Tubesheet

Pressurizer

Pressure Boundary


Feature B&W 177 Typical Gen 3 PWR

B&W mPower


B&W mPower

Rated Core power (MWth) 2568 3415 425

Core average linear heat rate (kWth/m) 18.7 18.7 11.5

Average flow velocity through the core

(m/s)

4.8 4.8 2.5

RCS volume (m3) 325 272 91

RCS volume to power ratio (m3/MWth) 0.14 0.08 0.21

Maximum LOCA area (m2) * 1.3 1.0 0.009

* Assumes double ended break

RCS volume and small break sizes allow simplification of RCS safety systems


B&W mPower

Rated core power (MWth) 2568 3415 530

Core average linear heat rate (KWth/m) 18.7 18.7 11.5

Average flow velocity through the core

(m/s)

4.8 4.8 3.1

RCS volume (m3) 325 272 92

RCS volume to power ratio (m3/MWth) 0.14 0.08 0.18

Maximum LOCA area (m2) * 1.3 1.0 0.0067

RCS volume/LOCA area ratio (m3 /m2) 250 270 13,700

Key Features of the Integral RCS


• 69 fuel assemblies

• < 5 wt% 235U enrichments

• No soluble boron for control

• Axially graded BPRs

• Gd2O3 spiked rods

• Control rod sequence exchanges

• AIC and B4C control rods

• 3% shutdown margin

Core Design Features

© 2012 Generation mPower LLC All rights reserved. 14 14

Shortened and Simplified Conventional Fuel Assembly Design

Conventional 17x17 design

Fixed grid structural cage

Design optimized for mPower

Upper End Fitting

End Grid

Mid Grid

17 x 17 Square Array

Control Rod Guide Tube

End Grid

Lower End Fitting

Fuel Mechanical Design Features

© 2012 Generation mPower LLC All rights reserved. 15 .15

Low Core Linear Heat Rate

• Low power density reduces fuel and clad temperatures during

accidents

• Low power density allows lower flow velocities that minimize flow

induced vibration effects

Large Reactor Coolant System Volume

• Large RCS volume allows more time for safety system response in

the event of an accident

• More coolant is available during a small break LOCA providing

continuous cooling to protect the core

Small Penetrations at High Elevation

• High penetration locations increase the amount of coolant left in the

vessel after a LOCA

• Small penetrations reduce rate of energy release to containment

resulting in lower containment pressures

CONFIDENTIAL AND PROPRIETARY TO B&W

Inherent Safety Features


Center for Advanced Engineering Research (CAER)

Bedford, VA

Greater than $100M Investment in Component Testing Program and IST Facility

Component Tests

• Reactor Coolant Pump

• CRDM

• Fuel Mechanical Testing

• CRDM/Fuel Integrated Test

• Fuel Critical Heat Flux

Integrated Control Rod Drive Line

• Static Test Facility

• Cold Flow Test Loop

Integrated Systems Test (IST)

• Heat Transfer Phenomena

• Steam Generator Performance

• LOCA Response

• Pressurizer Performance

• Reactor Control

Development Testing Programs


ASME Code

• The B&W mPower reactor is designed, analyzed and will be

constructed to the ASME B&PV Code, 2007 Edition with 2008

addenda

• Pressure boundary is ASME Section III, Subsection NB

• Core supports structures are ASME Section III, Subsection NG

• Internal, non-core support component design is informed by

ASME Section III, Subsection NG and NB

• Reactor support (skirt) is ASME Section III, Subsection NF

• Code jurisdiction has been established for all components

• The reactor design includes features specifically to facilitate in-

service inspection required by ASME Section XI

B&W mPower Design Code


mPower Overviews for ASME

• mPower Reactor Overviews for ASME

Keep ASME informed of mPower reactor design

• Recent Presentations

ASME Executive Committee on Strategy (8/11/11)

ASME 2011 SMR Symposium, Plenary Session (9/29/11)

ASME Overview presentation to NRC (11/17/11)

Overview presentation to Section XI (2/6/12)

• ASME Feedback

Encouraged B&W to continue apprising them of the design

Eager to resolve any potential ASME standards issues


Planning for Initial Deployment

• TVA Clinch River Project US regulation 10CFR Part 50 license approach

Construction Permit (CP) by 2015; fuel load in 2019

Initial pre-submittal planning work underway

Number of modules and configuration being evaluated

• Design Certification Application (DCA) US regulation 10CFR Part 52 license approach

Benefit / Informed by TVA 10CFR Part 50 effort

Higher level of engineering completion

One design / review during parallel licensing process

4Q2013 submittal to NRC

19


Key Challenges

Design and Licensing

• Risk-informing design and regulatory reviews

• “Right-sizing” staffing, source terms, EPZ, etc.

• Development testing – validation of design concepts

Manufacturing

• Optimization of capital investment and existing

facilities to reach mass market adoption capacity

• N-qualified forging capability in North America –

impacts long lead material procurement

Construction

• Below grade containment /shield building

• 36-month construction schedule


Summary

Develop and deploy commercially viable SMR by 2020

Design, Construction, and Operating Certainty

• GEN III+, existing NRC regulation

• Passive safety, robust margins

• Standard fuel, standard operations

• Comprehensive testing and verification program

• Proven manufacturing and construction capability

• Constructability / Modularity, 70% factory assembly

Business Benefits

• Three-year construction schedule, accelerated returns

• Incremental “buildout” matches retirements, load growth, local infrastructure

• Protection from natural gas price volatility and coal-related environmental issues

• Lower total cost, improved financing, less balance sheet stress

• Competitive LCOE

Basis for GmP and B&W mPower™ Reactor “Value Proposition”

Questions?

Documents

Reactor Design Overview - uxc.com Specific/mPower...Reactor Design Overview ANSI-NIST Gaithersburg, MD March 12, 2012 Matt Ales Component Design Lead Engineer The Babcock & Wilcox