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Reactor Building And Associated Systems

Tim Stack Technical Integration AREVA NP, Inc.

AREVA NP, INC.

Demands on Reactor Building

High Energy Pipe Ruptures (LOCA, MSLB) Failure of vessels and tanks Aircraft Hazards Load Drops Internal Explosion and Missiles Fire Flooding Seismic Explosion Pressure Wave

AREVA NP, INC.

Introduction to U.S. EPR

Presented to US DOE October 20, 2006

2

EPR Reactor Building Systems

Containment Building Shield Building Annulus Ventilation System Non-Safety Related Containment Ventilation Penetrations, Hatches, Airlocks Containment Isolation Severe Accident Mitigation Design Features (e.g., Basemat Cooling)

AREVA NP, INC.

Introduction to U.S. EPR

Presented to US DOE October 20, 2006

3

EPR Reactor Building

> > > > > > > > > > Containment wall post-tensioned concrete with steel liner Shield Bldg wall reinforced concrete Containment Free Volume = 2.8 Mft3 Containment Inside Diameter = 153.5 ft. Containment Wall Thickness = 4.3 ft. Design pressure = 62 psig Design temperature = 338 °F Annulus sub-atmospheric and filtered to reduce radioisotope release In-Containment Refueling Water Storage Tank (~500,000 gal) Severe accident mitigation features Design leak-rate at design pressure for a 24-hour period is less than 0.25 percent by volume

AREVA NP, INC.

Introduction to U.S. EPR

Presented to US DOE October 20, 2006

4

Containment Liner Plate

Liner thickness = ¼" Carbon steel liner with no stress relief required Liner extends into basemat to prevent release of radioactivity into ground

AREVA NP, INC.

Introduction to U.S. EPR

Presented to US DOE October 20, 2006

5

Containment Liner Plate

Segments of containment steel liner arrive

AREVA NP, INC.

Introduction to U.S. EPR

Presented to US DOE October 20, 2006

6

Shield Building

Primary Function ­ Protect Containment Building from external hazards

· Reinforced Concrete (without liner) · Inside Diameter 53 m (174 ft.) · Isolated from Containment down to basemat · 1.8 m (5' 10") thick above adjacent Safeguards Building roofs · 1.3 m (4' 3") thick below adjacent Safeguards Building roofs

APC-wall

Decoupled civil structure

Decoupled civil structure

AREVA NP, INC.

Introduction to U.S. EPR

Presented to US DOE October 20, 2006

7

Containment P/T Response to DBA

LOCA

9

Containment Pressure

PR1

0 0

0.1 1

Containment sprays and fan coolers not required to mitigate short-term pressure or temperature responses to DBAs Containment sprays and fan coolers not required to mitigate long-term pressure response to DBAs

RHR system sufficient to reduce pressure to ½ the peak in < 8 hrs after LOCA

0.6 6

DESIGN PRESSURE

0.5 5

Pressure (MPa)

Pressure (kPa)

0.2 2

0.3 3

0.4 4

0 0

50 50

100 100

150 150 Time (sec)

200 200

250 250

300 300

GOTHIC 7.2(QA) Mar/30/2005 09:09:02

SLB

8

Containment Pressure (Bars)

PR1

0.6 0.6

DESIGN PRESSURE

0.5 0.5

Pressure (MPa)

Pressure (MPa)

0 0

0.1 0.1

0.2 0.2

0.3 0.3

0.4 0.4

0

GOTHIC 7.2(QA) Apr/05/2005 10:35:44

3.6

7.2 Time (sec)

10.8

14.4 X1e3

AREVA NP, INC.

Introduction to U.S. EPR

Presented to US DOE October 20, 2006

8

Radiological Consequences to DBA

Containment sprays not required for Iodine removal following design basis accident:

Annulus Ventilation System

· Maintains annulus at least 620 Pa (0.09 psi) sub-atmospheric · Two safety-related, 100% capacity air extraction systems powered from separate Safeguards divisions · Exhaust all annulus air through HEPA and Iodine filters prior to release

Double Wall Containment with Annulus Air Extraction System

Limit containment building leakage to 0.25% volume/day at design pressure

In-containment Refueling Water Storage Tank (IRWST)

AREVA NP, INC.

Introduction to U.S. EPR

Presented to US DOE October 20, 2006

9

Containment Isolation

Function is containment isolation to minimize release of fission products to environment.

EPR Containment isolation provisions:

· Assured through penetration and isolation valve arrangements needed to isolate containment. · Generally include minimum of 2 isolation valves powered and operated independently. Valves are automatically isolated or locked closed. · Satisfy NRC criteria for containment isolation.

AREVA NP, INC.

Introduction to U.S. EPR

Presented to US DOE October 20, 2006

10

Aircraft Hazard Protection

Penetration (local resistance) Overturning (global stability) Secondary Missiles (spalling) Induced Vibrations Fire (fuel)

AREVA NP, INC.

Introduction to U.S. EPR

Presented to US DOE October 20, 2006

11

Aircraft Hazard Protection

Shield Wall

Decoupled Civil Structure

Decoupled Civil Structure

12

AREVA NP, INC.

Introduction to U.S. EPR

Presented to US DOE October 20, 2006

Aircraft Hazard Protection

3+4UQB

1+2UQB

UBP UFA protection by design UJA UJH protection by separation UJK UKA without protection UKE UKH UKS UQB

2UJH 2UJK 3UJH 3UJK UKE

Emergency Diesel Generator Building Fuel Pool Building Reactor Building Safeguard Building, Mechanical Part Safeguard Building, Electrical Part Nuclear Auxiliary Building Access Building Vent Stack Radioactive Waste Processing Building Service Water Pump Building

2UBP 1UBP +SBO+SBODiesel

3UBP 4UBP +SBO+SBODiesel

1UJH 1UJK UJA

4UJH

4UJK

UKH UKA UFA UKS

AREVA NP, INC.

Introduction to U.S. EPR

Presented to US DOE October 20, 2006

13

Aircraft Hazard Protection

AREVA NP, INC.

Introduction to U.S. EPR

Presented to US DOE October 20, 2006

14

Aircraft Hazard Protection

Commercial Aircraft Loaded Areas

AREVA NP, INC.

Introduction to U.S. EPR

Presented to US DOE October 20, 2006

15

Summary ­ Reactor Building System

EPR Reactor Building System consists of:

Post-tensioned concrete containment building with steel liner Reinforced concrete shield building that surrounds containment building Annulus ventilation system Containment isolation system Design features to mitigate severe accident scenarios

Mitigate containment pressure/temperature response to DBAs without safety-related sprays or fan coolers. Mitigate radiological consequences to DBAs without safety-related sprays. Protect against spectrum of aircraft hazards and external explosions.

AREVA NP, INC.

Introduction to U.S. EPR

Presented to US DOE October 20, 2006

16

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