ML20148J458
| ML20148J458 | |
| Person / Time | |
|---|---|
| Issue date: | 03/23/1988 |
| From: | Leech P Office of Nuclear Reactor Regulation |
| To: | Rubenstein L Office of Nuclear Reactor Regulation |
| References | |
| PROJECT-669A NUDOCS 8803300277 | |
| Download: ML20148J458 (18) | |
Text
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l 4 March 23, 1988-Project No. 669 -
MEMORANDUM FOR: Lester S. Rubenstein, Director Standardization and Non-Power Reactor Project Directorate Division of Reactor Projects - III, IV, V and Special Projects FROM:
Paul H. Leech, Project Manager Standardization and Non-Power Reactor Project Directorate Division of Reactor Projects - III, IV, Y and Special Projects
SUBJECT:
MEETING WITH ELECTRIC POWER RESEARCrl INSTITUTE AT Rockville, Maryland, March 18, 1988 On March 18, 1988, representatives of the Electric Power Research Institute (EPRI) provided a briefing for ONRR senior management on passive safety systems being considered for the Advanced Light Water Reactor (ALWR) Program.
Those persons who attended the meeting are listed in Enclosure 1. consists of copies of the viewgraphs presented by EPRI. As indicated on the fourth and fifth pages, a passive plant design would feature (1) gravity-driven ECCS, (2) natural circulation decay heat removal, and (3) passive containment heat removal. The numbers of components, such as pumps and valves, can be substantially reduced and it is expected that rapid construction can be achieved through modularization and factory fabrication.
A reference plant capacity of 600 MWe has been selected as the basis for development of the utility-generated requirements for the passive ALWR, which can be either a BWR or a PWR.
EFRI informed the staff that the rest of the Chapters (6 through 13) of the l'tility Requirements Document for the 1100-MWe ALWR plant will be submitted, as planned, by the end of 1988 for NRC review.
Then, a revised Chapter 1 and a parallel set of Chapters 2-13 for the 600-MWe passive plant will be submitted in 1989. EPRI's view is that, since most of the material in the two sets of documents will be the same, a six-nonth extension (to mid-1991) of the NRC's schedule for completion of its Final Safety Evaluation should be adequate.
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March 23, 1988 Project No. 669 MEMORANDUM FOR:
Lester S. Rubenstein, Director Standardization and Non-Power Reactor Project Directorate Division of Reactor Projects - III, IV, Y and Special Projects FROM:
Paul H. Leech, Project Manager
-Standardization and Non-Power Reactor Project Directorate Division of Reactor Projects - III, IV, Y and Special Projects
SUBJECT:
MEETING WITH %ECTRIC POWER RESEARCH INSTITUTE AT Rockville, Mary 1and, liarch 18, 1988 On March 18, 1988, representatives of the Electric Power Research Inctitute (EPRI) provided a briefing for ONRR senior management on passive safety systens being considered for the Advanced Light Water Reactor (ALWR) Program.
Those persons who attended the meeting are listed in Enclosure 1. consists of copies of the viewgraphs presented by EPRI. As feature (1) gravity-driven ECCS, (pages, a passive plant design would indicated on the fourth and fifth 2) natural circulation decay heat removal, and (3) passive containment heat removal. The numbers of components, such as pumps and valves, can be substantially reduced and it is expected that rapid l
construction can be achieved through modularization and factory fabrication.
A reference plant capacity of 600 MWe has been selected as the basis for development of the utility-generated requirements for the passive ALWR, which l
l -
EPRI informed the staff that the rest of the Chapters (6 through 13) of the Utility Requirements Document for the 1100-MWe ALWR plant will be submitted, i
as planned, by the end of 1988 for NRC review. Then, a revised Chapter 1 and a parallel set of Chapters 2-13 for tho 600-MWe passive plant will be submitted in 1989. EPRI's view is that, since most of the material in the two sets of documents wil' be the same, a six-month extension (to mid-1991) of the NRC's schedule for completion of its Final Safety Evaluation should be adequate.
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Paul H. Leech, Project Manager Standardization and Non-Power Reactor Project Directorate Division of Reactor Projects - III, IV, Y and Special Projects Enclosuru:
As stated
i ATTENDANCE LIST Meeting with Electric Power Research Institute (EPRI) at the One White Flint North Building in Rockville, Maryland March 18, 1988 Name Organization Thomas Murley NRR Frank Miraglia NRR Dennis Crutchfield NRR Larry Shao NRR Conrad McCracken NRR Lester Rubenstein NRR Thomas Kenyon NRR Paul Leech NRR Thomas Walker RES Frank Gillespie NRR William Sugnet EPRI Joseph Yedidia EPRI John DeVine, Jr.
bncko$ute 9-()Esheli Passive Plant PRESENTATION TO NRC STAFF March 18,1988 AGENDA
. Passive Plant Program Overview J. C. DeWe JrMPRI Passive Plant Design Concepts W. R. Sugnet/EPRI
,, EPRI AL WR Procram Cassive Plant ALWR PROGRAM GOALS
. Establish utility leadership and effect posivite progress toward a revitalized nuclear power option in the United States
. Forrnulate a practical and credble foundation for the design of ad ranced light water reactors for the next decade EPR! ALWR Proaram
- Passive Plant ALWR PROGRAM OBJECTIVES in support of these goals, the ALWR Program objectives are:
A stabilized regulatory basis, via cooperative effort with NRC to identify and resolve outstanding issues of nuclear plant safety Development of a set of specific design and performance requirements for the advane:d LWR (The
- Requirements Document *)
An assessment of nuclear ;)lant design concepts which would incorporate creativ simo!nied. cassive sa'etv systems EPRI ALWR Procram l
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Passive Plant Major Elements and Funding "gNP U. S. ALWR (EEef eCe9esetun
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. JAPCEPRLGE three-party agreement
- exchanges earh EPRI work for results of JAPC/GE 1986 work JAPC currently mnsidering followen work
- potential for larger exchange with EPRLOOE results
. European organizations contacted in 1987
- KEMA (Holland)
CEGB (U.K.)
ENEL (Italy)
VDEW (Germany)
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TVO (Finland) l several negotiating to participate EPRI AL WR Procram i
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Passive Plant CONCEPT
+ Utilizes primarily passive means (gravity, natural circulation, stored energy) for accident prevention and mitigation
- Core protected without operator action for about 3 days
- Greatly simphfied compared to existing plants
. PWR or BWR, reference size 600 MWe i Extensive modularization, prefabrication EPRI ALWR Procram l
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Passive Plant l
KEY ADVANTAGES
- Passive Plant offers hhh potential for renewed pubfc.
govemment and investor confidence l
- Fundamental advances in l
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- Ecenomic prospects better match to utility needs with uncertain demano growth smaller capital investment to first power gt nerated j
l major simphfication and rapid construction to neutralize I
traditional economy of scale l
= Historical high capacity factor for smaller, simpler plants EPRI ALWR Procram
Passive Plant TECHNICAL APPROACH Based on proven technology - no prototype required Perform necessary safety functions by passive means Gravity driven ECCS Natural circulation decay heat removal Passive containment heat remova Rapid construction (36 months) with maximum use of modularization and f actory fabrication EPRI ALWR Procram Passive Plant PROGRAMMABC APPROACH EPRlleadership in Phase 1 l
l Expanded emphasis and resources in Phase 2 technical evaluation of key issues extend utility requirements to cover passive system concepts Two design teams:
SBWR: GE/BechteL'MIT AP600: W/ Bums & Roe /Avondale Synergism close cooperation with large DOE program
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raaintain strong utility liaison EPRI ALWR Procram l
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Passive Plant UTILITY REQUIREMENTS DOCUMENT Evo!utionary Plant Chacters 2 Power Generation 3 Reactor Coolant System 4 Reactor 5 - Safety Systems 6-Plant Arrangements 7 - Hefueling 8 - Cooling Water 9 Site Support
- MMIS EPRI ALWR Procram l i
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Passive Plant SBWR Features NATURAL CIRCULATION
. Full power capability using nattital circulation for core flow
. Major simplification no recirculation pumps
. Lower power density core
- more thermal magin better fuel economics
. Larger RCS inventory -lower pressure rate, better Uansient response
. Need to control vessel height EPRI ALWR Procram Passive Plant SBWR F6atures ISOLATION CONDENSER / STEAM INJECTOR
. Natural circulation decay heat removal when reactor is isolated isolation condenser cooled by elevated suppresion pool No need for separate heat sink for isolation condenser
. Steam injector provices passrve means for limited makeup to RCS
. Prevents need to depressurize system for small RCS leaks
. Device development and testing in process EPRI ALWR Procram
Passive Plant SBWR Features GRAVITY DRAIN COOLING SYSTEM
+ Depressurization valves open to reduce system pressure
. Larger RCS inventory keeps core covered during depressurization (positive synergy between NC and GDCS)
. Gravity flow from elevated suppression pool provides core coohng
- Demonstration testing and model benchmarNng in process EPRI ALWR Prowam l
l Passive Plant SBWR Features PASSIVE CONTAINMENT COOLING SYSTEM
= Water wallconcept provides passive heat removalfrom suppression pool
- Clean water boils to atmosphere 34ay water suppty
. Optimum configuration being studied water wall approach boiler tube modular approach EPRI ALWR Procram
Passive Plant AP600 Features IMPROVED RCS CONFIGURATION
. Canned motor RCPs, directly coupled to SG outlet
. Removes crossover leg from RCS
. Simpidied loop arrangement allows single support on bottom of SG
. Lower resistance loop and enhanced pump inertia provide capabikty for loss of flow
. High inertia pump bearing being tested Verification of access / maintainability aspects of configuration in process EPRI ALWR Procram Passive Plant AP600 Features l
NATURAL CIRCULATION DHR t
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- Full pressure heat exchanger connected to RCS
. Thermal driving head from core produces natural circulation flow
. In-containment Refueling Water Storage Tank provides heat sink EPRI ALWR Procram l
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Passive Plant AP600 Features GRAVITY-DRIVEN ECCS
- Full pressure Core Makeup Tanks drain to keep core covered during depressurization
. Gravity flow from IRWST floods depressurized RCS for long term moling Studies in process to assess likelihood of and recovery from inadvertent operation EPRI ALWR Procram Passive Plant AP600 Features PASSIVE CONTAINMENT COOL.ING
- Steel containment with concrete shield building and annulus removes decay heat by natural convection
- Exterior of containment is wetted to improve heat transfer for early phase
. Air cooling sufficient for long term cooling
. Analyses and test being conducted to verify sufficient heat transfer EPRI ALWR Procram
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Passive Plant AP600 Features MODULARIZATION
. Modularization and f actory fabrication have been integral to the concept from the outset
- Earty studies show"A economb incentive for f actory f abrcation in fluid / mechanical areas Extensive ongoing work to optimize modular approach EPRI ALWR Procram Passive Plant l
Simplification Through Passive Systems scery Rella lity
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s, o.se Simplicity Passive system design leads to
- improved safety and relia bility major simplification EPRI ALWR Procram l
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Passive Plant POTENTIAL FOR SIMPLIFICATION TYPICAL 2-LOOPAP 600 PLANT PLANT REDUCTION Valves 2,200 400 80 %
Pumps 40 14 65 %
Seismic Building 274,100m3 157,700m3 40%
Total Building 452,300m3 350,200m3 20 %
- Use of passive system design has magtpotential for simplification EPRI ALWR Procram l
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