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Development of Medium and Small Reactors: DMS

K. TOMINAGA Hitachi Ltd.

Light Water Reactor Innovations

1

- TABLE OF CONTENTS 1. Introduction 2. Plant Concept and Features 3. Reactor Core and RPV Design 4. Plant System Design 5. Plant Layout Design 6. Conclusion

1.

Introduction(1/4)

2000

Scale Merit Scale Merit

2

Consideration of Regional Conditions Consideration of Regional Conditions

1000

Passive Systems

Serialized output level

1960

1970

1980

1990

2000

2010

Hitachi & JAPC Joint Study

1.

Introduction(2/4)

3

BACKGROUND BACKGROUND

The needs of the suitable output level for slow increment of power The needs of the suitable output level for slow increment of power demand in JAPAN. demand in JAPAN. The needs of short payback period and reduction of investment The needs of short payback period and reduction of investment burden under liberalized market burden under liberalized market

PURPOSE PURPOSE

In order to fulfill market needs, DMS-400 has been developed In order to fulfill market needs, DMS-400 has been developed --to achieve early deployment with proven technologies. to achieve early deployment with proven technologies. --with medium sized output power (400MWe) with medium sized output power (400MWe)

1.

Introduction(3/4)

4

Cost up due to scale down

How to overcome scale demerit ; Simplification and compact Standardization

1.

Introduction(4/4)

5

BASIC PLANT TARGET BASIC PLANT TARGET OUT PUT ::Power output range is determined to be 300 to OUT PUT Power output range is determined to be 300 to 400 MWe. 400 MWe. ECONOMY ::Construction cost should be comparable to ABWR. ECONOMY Construction cost should be comparable to ABWR. SAFETY ::Safety level is as same as the actual plants. SAFETY Safety level is as same as the actual plants. R&D ::No large R&D required ,,to utilize the proven technology. R&D No large R&D required to utilize the proven technology.

2.

Plant Concept and Features(1/2)

Simplified RPV Simplified RPV

Simplified Dryer

6

P

· To enhance core flow by low · To reduce RPV height.

· To reduce annual inspection period.

Free Surface Separator (FSS) Divided Chimney Chimney Shortened Fuel CR Guide Tube Natural Circulation

· To enhance core flow by low · To keep fuel thermal limitation.

P.

· To keep large core flow due to coolant evaporation at core region. ( BWR inherent character)

2.

Plant Concept and Features(2/2)

7

Simplified RPV Simplified RPV

·Natural Circulation ·Free Surface Separator

Compact PCV Compact PCV

·Eccentric RPV Location ·Free Stamding Steel PCV

Simplified Systems Simplified Systems

·Rationalized ECCS

Rationalized Layout Rationalized Layout

·Compact R/B & T/B

3.

Reactor Core and RPV Design(1/3)

7.1m

8

Natural Circulation Reactor and Shortened Fuel Natural Circulation Reactor and Shortened Fuel

Natural Circulation Reactor 5.8m To Keep Power Density To Keep Recirculation Force

21m

Low Core

P

Low System

P

15.5m

Low Power Density Core

Shortened Fuel

Free Surface Separator

Moderate Steam Evaporation RPV Height Reduciton No Separator Removal No DS Pit Space

ABWR ABWR

DMS-400 DMS-400

24 Month Long Operation Cycle

Compact RPV Compact R/B

Reduced Period Inspection

3.

Reactor Core and RPV Design(2/3)

9

Shortened Fuel Reduces RPV & PCV & R/B Height Shortened Fuel Reduces RPV & PCV & R/B Height

Shielding Depth Items Spent Fuel Pool (1) Spent Fuel Pool Fuel Handling Space Spent Fuel Rack (2) RPV Active Fuel Length CR Guide Tube (3) Lower Drywell CR Housing CR Replacement Space Total RPV PCV R/B

Shortened Fuel Length

3.

Reactor Core and RPV Design(3/3)

10

Free Surface Separator (FSS) Gravitational steam separation (FSS) is possible for natural circulation reactor, become of its low steam velocity.

Simplified Core Internals contribute to improve economy. to reduce pressure drop. to reduce annual inspection period. Elimination of Dryer/Separator Pit contribute to reduce R/B volume.

Steam Dryer Separator Divided Chimney

No Separator Separator

Core

DMS-400

ABWR

4.

Plant System Design(1/3)

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Simplified NSS Specification System integration for dual functions System integration for dual functions Application of passive systems Application of passive systems Reduction of system train number by adopting the large capacity equipment Reduction of system train number by adopting the large capacity equipment

Items MS Line FW Line SRV RHR FPC RCW/RSW TCW/TSW ACC* ABWR 700A x 4 550A x 2 395t/h x 18 3 1 3 1 DMS-400 500A x 2 300A x 2 460t/h x 5 2 Common use of RHR 2 Common use of RCW RSW 1 *) ACC: Accumulator injection system

Residual heat removal (RHR) system

Reactor pressure vessel (RPV)

Note

Apprication of passive systems

Accumulator injection system Accumulator standby liquid control (SLC) system

Integration of RCW/RSW and TCW/TSW

Primary containment vessel (PCV)

Main Steam Lines Feedwater lines

Control rod drive mechanism

MS 2 lines Large capacity SRV Low pressure loss MSIV

Reactor core isolation cooling (RCIC) system

Common use of FPC/RHR pump and heat exchanger

Reactor water cleanup (CUW) system

4.

Plant System Design(2/3)

ECCS Analysis

12

Rationalized ECCS

Natural Circulation Reactor gives Large amount of coolant inventory in RPV Large safety margin at LOCA

Core can be covered Core can be covered with coolant even with coolant even though the most though the most severe LOCA case. severe LOCA case.

4.

Plant System Design(3/3)

13

Rationalized Main Equipments

Pump Pump

140

Heat Exchanger Heat Exchanger

Number of Heat Exchangers (units) Small pumps Midium pumps Large pumps

70 60 50 40 30 20 10 0 ABWR DMS-400

Number of Main Pumps (units)

120 100 80 60 40 20 0

(100%)

(100%)

(42%)

(35%)

ABWR

DMS-400

Number of pumps and heat exchanger is reduced as follows Pump : 42% Heat Exchanger : 35%

5.

Plant Layout Design (1/3)

14

MS Steam Piping

Compact PCV Technologies Compact PCV Technologies

Compact RPV Reduction of Number of MS Eccentric PCV Dish shaped Drywell

Dish Shaped Drywell

Compact RPV

Approx 25mH ABWR (1356MWe) RPV MS PCV 7.1 21 H 700A 29m 4 DMS (400MWe) 5.8 15.5 H 500A 17m 2 25mH

Cut View of Compact PCV Cut View of Compact PCV

Eccentric PCV

Approx 17m

36.2mH

5.

Plant Layout Design (2/3)

15

Hybrid R/B Layout Concept

5.

Plant Layout Design (3/3)

16

Relative Building Volume of DMS-400 is equivalent to ABWR.

7.

Conclusion

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DMS-400 has been developed as aa400MWe medium sized power plant. DMS-400 has been developed as 400MWe medium sized power plant. Compact RPV is achieved by adopting natural circulation, gravitational steam Compact RPV is achieved by adopting natural circulation, gravitational steam separation and short length fuel. separation and short length fuel. Simplified ECCS systems can be adopted with increased coolant inventory. Simplified ECCS systems can be adopted with increased coolant inventory. NSSS and BOP systems have been simplified by integrating of the systems with NSSS and BOP systems have been simplified by integrating of the systems with dual functions and etc. dual functions and etc. PCV and building volume per unit output of DMS-400 become equivalent to aa PCV and building volume per unit output of DMS-400 become equivalent to large-sized plant. large-sized plant. DMS-400 has attained the excellent economical competitiveness. DMS-400 has attained the excellent economical competitiveness. Further rationalization study is going on. Further rationalization study is going on.

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