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©SNPTC 2015.All rights reserved.
此处的位置是一级标题
Strengthen the Cooling Chain
in Passive Nuclear Power Plant
Shanghai Nuclear Engineering Research & Design Institute
Jun 22, 2015
©SNPTC 2015.All rights reserved.
此处的位置是一级标题
Contents
1. Introduction of SNERDI
2. Strengthen the Cooling Chain
3. Summary
2
©SNPTC 2015.All rights reserved.
此处的位置是一级标题
Founded in Feb 8th, 1970, originally belong to CNNC.
In 2007, became subsidiary of SNPTC.
Design of Qinshan NPP -- 1st NPP in China mainland.
Design of Pakistan Chashma NPP --1st China export NPP.
Technical support to imported CANDU-6.
Chinese CNP1000 development and design.
History
1. Introduction of SNERDI
3
©SNPTC 2015.All rights reserved.
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AP1000 technology transfer (TT), Assimilation and Absorption.
The standardization design and engineering of CAP1000.
The large passive PWR demonstration engineering, CAP1400.
Project achievement
4
Haiyang
CAP1400
Hongyanhe
Qinshan
Sanmen
Lufeng Pakistan
Operation
Construction
Bailong
Taohuajiang
Xianning
Pengze
1. Introduction of SNERDI
©SNPTC 2015.All rights reserved.
此处的位置是一级标题
Contents
1. Introduction of SNERDI
2. Strengthen the Cooling Chain
3. Summary
5
©SNPTC 2015.All rights reserved.
此处的位置是一级标题
6
2010 Conceptual design completed
2011 Basic design completed
2015 First concrete
2019 Connect to grid
Key Milestones of CAP1400
2. Strengthen the Cooling Chain
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CAP1400 Main parameters
7
Parameters AP1000 CAP1400
Core thermal power, MWt 3400 4040
Electric power, MWe ~1250 ~1500
RCS average temp, ℃ 300.9 304
RCS pressure, MPa(a) 15.5 15.5
Fuel assemblies 157 193
Average linear power, W/cm 187 181
SG type △125 New design
SG outlet pressure, MPa(a) 5.61 6
Steam flow per loop, kg/s 944 1122
Design flow per pump, m3/h 17886 21642
DNBR margin >15% >15%
2. Strengthen the Cooling Chain
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CDF: 4*10-7
LRF: 5.07*10-8
Enhancement against Fukushima Accident:
Design against extreme unlikely external events: flood, seismic,
Severe accident mitigation, Emergency response, Mass disturbances
event, Mobile pumps/diesel generators to further increase safety
margin…
Safety Review:
NNSA initiated the CAP1400 review in Apr, 2013 and last about 2
years, ~5000 questions answered, most of them closed.
One of the 19 critical questions is Strengthen the Cooling Chain.
CAP1400 Safety
8
2. Strengthen the Cooling Chain
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The CAP1400 adopts passive safety systems to enhance plant
safety and to satisfy the 3rd generation NPP licensing requirements. The
passive safety are: PXS+PCS
CAP1400 Safety systems
9
2. Strengthen the Cooling Chain
PXS PCS
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Independent electric power
To prevent the equipments backup of each other lost electric power at
the same time, we employ two independent electric source from different
bus.
Fire compartment
To prevent lost all the equipments by fire, we isolate the parallel
equipments by firewall,and the support system and electric power also
take the rule.
Raise seismic grade of SSCs related to Cooling chain
Design Criteria Raised for Cooling Chain
10
2. Strengthen the Cooling Chain
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The scope of structure related to the cooling chain as followed:
Annex building (40)
Diesel Generator Building (60)
Circulating Water Pump House (71)
Turbine Building (20)
First Bay of Turbine Building (21)
Composite Trench (002)
Circulating Water Intake Ditch (023)
Cooling Chain related Structures
11
2. Strengthen the Cooling Chain
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Seismic Design
Annex building :Designed per seismic category II and don’t need
strengthen.
Civil Standard:《Code for seismic design of buildings》
Diesel Generator Building :
Circulating Water Pump Houser Pump House
Turbine Building :
First Bay of Turbine Building
Circulating Water Intake Ditch
Composite Trench
Structure Strengthen Principle
12
2. Strengthen the Cooling Chain
The seismic response spectrum use the
spectrum of Site Safety Evaluation
(0.05g---→0.071g)
Meeting the demand and don’t need
change seismic design
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Structure Horizontal Response spectrum
13
2. Strengthen the Cooling Chain
Horizontal
Period(S)
Acce
lera
tio
n R
esp
on
se
Sp
ectr
um
(g)
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To prevent unnecessary actuation of the safety-related passive
systems and investment protection,it is necessary to strengthen the
Cooling Chain in Passive Nuclear Power Plant. The related systems are
as followed:
RNS: Normal Residual Heat Removal System
CCS: Component Cooling Water System
SWS: Service Water System
SFS: Spent Fuel Pool Cooling System
FWS: Main and Startup Feedwater System
DWS: Demineralized Water Transfer and Storage System
Cooling Chain related Systems(1/2)
14
2. Strengthen the Cooling Chain
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And their supporting systems as followed:
ZOS: Onsite Standby Power System
ECS: Main AC Power System
EDS: Non Class 1E DC and UPS System
PLS:Plant Control System
DOS:Standby Diesel and Auxiliary Boiler Fuel Oil System
Cooling Chain related Systems (2/2)
15
2. Strengthen the Cooling Chain
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Using the corresponding structure seismic response spectrum to
calculation and analysis the pipes, supports, anchors and equipments,
and horizon direction seismic force should be considered.
Purchasing mature CLASS C pumps and valves. If the supplies don’t
have mature CLASS C equipments, then they can supply the
equipment based on the response spectrum of Site Safety Evaluation
(Beyond 10% probability in 50 years)。
Update the related equipment specifications with these requirements。
System Strengthen Principle
16
2. Strengthen the Cooling Chain
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The relationship between the cooling chain seismic strengthen
requirements and the existing seismic design of non seismic and investment
protection seismic:
Further requirements should be emphasized in the equipments specifications.
Emphasizes the availability of equipment under moderate earthquake
frequency.
Further development of cooling chain seismic strengthening acceleration
value accounting for the pipeline, support, anchor components.
Seismic Requirement Difference
17
2. Strengthen the Cooling Chain
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The Electric and Instrument equipments of RNS should be designed
according to the 8 degree seismic level.
Cable tray should be designed in accordance with 7 degrees seismic
level evaluation (Annex building, diesel generator building are 8
degrees)。
Equipment classification maintain D level, seismic rating of non
seismic (NS), quality assurance level unchanged.
Seismic design is based on new floor response spectrum.
Further requirements should be emphasized in the specifications.
The Electric and Instrument Supporting System Strengthen Principle
19
2. Strengthen the Cooling Chain
©SNPTC 2015.All rights reserved.
此处的位置是一级标题
Contents
1. Introduction of SNERDI
2. Strengthen the Cooling Chain
3. Summary
20
©SNPTC 2015.All rights reserved.
此处的位置是一级标题
To prevent unnecessary actuation of the safety-related passive
systems and investment protection,it is necessary to strengthen the
Cooling Chain in Passive Nuclear Power Plant.
During safety review,China National Nuclear Security Agency
(NNSA ) also put emphasis on cooling chain of Defence in Depth.
Strength the SSCs of the cooling chain and be approved by NNSA.
21
3. Summary