Confidential - Property of ASCO Valve Inc.
Agenda
Solenoid Valve Basics
Evolution of ASCO Nuclear Solenoids
AP1000 Challenges & Solutions
Qualification Lessons
Next Step
Confidential - Property of ASCO Valve Inc.
Function of Solenoids in Air Operated Valve The solenoid valve is an electromechanical device that converts an
electric control signal to mechanical energy to actuate the AOV The solenoid valve is located between control instrumentation and
actuator The solenoid valve is a specific safety related device The solenoid valve initiates the safety function by venting air from the
actuator Failure of solenoid valve will prevent AOV from operating correctly
and will prevent valve from achieving safety related function
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SOVs on Main AOV
AOV (air operated valve)
SOV (solenoid operated valve)
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Operational Testing of Fisher Valve With Solenoid Valve
Solenoid Valve
Confidential - Property of ASCO Valve Inc.
Agenda
Solenoid Valve Basics
Evolution of ASCO Nuclear Solenoids
AP1000 Challenges & Solutions
Qualification Lessons
Next Step
Confidential - Property of ASCO Valve Inc.
How we got to where we are A Brief History 1978 -1995 Nuclear products evolved from
commercial products already installed in plants
Selected by Nuclear Industry based on robust design and proven performance
ASCO modified design to meet NPP needs – All metal components – High Temp elastomers (Viton &
EPDM) – Radiation resistant components – Special coils and lead wires
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How we got to where we are A Brief History 1978 -1995 Qualified line of valves based
on IEEE and NRC guidance in 1978 – AQR21678
Qualified to higher levels in 1982 based on Westinghouse requirements – AQR 67368
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How we got to where we are A Brief History 1995 - 2007 ASCO responds to industry needs
for reducing maintenance costs by: – Increasing qualified life – Increased radiation resistance – Improved moisture resistance – Interchangeable with existing
products ASCO qualifies NS line of valves
input from the NUQEQ and NRC
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How we got to where we are A Brief History 1995 - 2007 Features of NS product
– Gamma Plus Elast – Molded coils – PEEK Lead wires
Latest IEEE standards and reg guide requirement
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Nuclear Valve Evolution
NP8316 NS8316 NT8316
Developed 1978 First SOV in Nuclear for Safety
Developed 1995 Harsh environment, long life
Developed 2011 Digital & more feature (AP1000)
• EPDM/FKM elastomers • Non-molded varnish • impregnated coils.
• Special elastomeric compound developed by ASCO
• Better radiation resistance, longer thermal life
• Increased resistance to high temperatures
• Red Hat II Coil with built in diode for digital applications.
• Quick Disconnect • Zero Minimum PSID • PEEK Leads
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NP/8300 Series
IEEE Nuclear Qualified Products
NT/8316 Series
NU Series
329 Series
Solenoid Valves
AD/156/163 Series
MT/231-232
Series
MB/121 Series
Confidential - Property of ASCO Valve Inc.
Agenda
Solenoid Valve Basics
Evolution of ASCO Nuclear Solenoids
AP1000 Challenges & Solutions
Qualification Lessons
Next Step
Confidential - Property of ASCO Valve Inc.
AP1000 Solenoid Valve Challenges
AP 1000 Requirements All solenoid valves
require suppression diode 200 C rated lead wire 30
ft lead wire Coil must be removable
Non 1E and 1E different
coating to distinguish Increased seismic loads
ASCO NT solution Integrate diode into one
piece molded coil PEEK lead wire from NS
qualification Red Hat II with molded in
QDC Red Hat II coils Black- 1E
Green non-1E Thicker mounting bracket
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Lessons Learned Solenoid Valves Leverage existing knowledge base
– Red Hat II – Commercial line – Peek Lead Wire – NS – Gamma Plus Elastomers - NS – Don’t re-event the wheel – use standard materials
Prequalification Screening – Establish Thermal & Radiation limits
• diodes, elastomers, coils, lead wires – Verify designs prior to qual testing
• Try several variations of materials / processes
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SOV – NT 8316 Safety Related AP1000
NT 8316 is used for safety related (1E) on AP 1000
Quick Disconnect (QDC) RHII Encapsulated Coil Internal Diode High Temp Radiation Resistant
Elastomers Zero Minimum Pressure
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NT Qualification Levels Thermal Aging: Zone 1 12 years at 50°C Other zones 18 years at 50°C Wear Aging: 15,000 cycles Radiation Aging/DBE: 40 Mega-Rads
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NT Qualification Levels Vibration Aging: 0.75 G’s 90 min. in X,Y,Z axes Operating Basis Earthquake: 4.4 G’s 2hz -> 64hz -> 2hz,
X,Y,Z axes. Seismic DBE: Sine beat test 1/3 octave 2 to
32 Hz intervals up to 6.6 G’s 1/6 octave from 32 to 64 Hz for
HRHF
Confidential - Property of ASCO Valve Inc.
Agenda
Solenoid Valve Basics
Evolution of ASCO Nuclear Solenoids
AP1000 Challenges & Solutions
Qualification Lessons
Next Step
Confidential - Property of ASCO Valve Inc.
AP1000 Qualification Challenges AP1000
Rapid LOCA curves
High HELB Temps Chemical Spray variation Mission Time w margin vs
actual time
Solutions
Labs can’t meet – Monitor component temps
for Thermal lag
Can materials function – Screening / Simulation
Verify with customer & Lab – every parameter
Understand safety function
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Qualification Program – Environmental Dbe LOCA - 425°F, Zone 1 profile.
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HELB: 485°F Zone 5 and zone10 profile
Qualification Program – Environmental Dbe
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Other EQ Lessons Learned Back up test samples
– Run in parallel 2 phases behind – Separate options/variations
– Increases sample size but minimizes risk Separate zones – aging isn’t cumulative across zones
– Zone 1 equipment doesn’t have to work in Zone 5 Age in phases with sacrificial parts to establish limits Qual. levels are based on component life not plant life
– AP1000 – 60 year life – Component thermal life = 10 years
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NT Qualification Levels LOCA: 450°F(232°C), Zone 1
profile. HELB: 500°F(260°C) Zone 5
and zone10 profile
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Electromagnetic Compatibility (EMC) • EMC Testing: • Required for compatibility
with digital equipment • 33 tests, • 5 month process • Get approval for any
variations including those suggested by consultants.
• Follow spec. based on rev dates
Conductive Ground Plane
Ground Reference Plane (GRP); floor
Gas In (P)
Exhaust Gas out (Cyl )
Bond to Ground plane
SOV (EUT)
DC Voltage SupplyGas Supply
72-inch SOV QDCfield Leads
Table Top Ground Plane
+ DC - DC
Insulating support between Ground Plane and EUT; when required
Non-conducting table
Shield Room Wall; when required
Test Setup BoundaryAntenna; when required Outside Shield Room
Wall; when required
Anechoic Chamber Wall; when required
Confidential - Property of ASCO Valve Inc.
Agenda
Solenoid Valve Basics
Evolution of ASCO Nuclear Solenoids
AP1000 Challenges & Solutions
Qualification Lessons
Next Step
Confidential - Property of ASCO Valve Inc.
NT Line Extension
Legacy NP Products 3 way Std Flow
– 8314 – 8320
3 way Mod. Flow – 8300
3 way High Flow – 8316 – 8321
NT Upgrade 3 way Std Flow
– NT 8320
3 way Hi Flow – NT8316
Simplification of Plant SOV (inventory), Longer Life
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NT Line Extension Curves NT HELB NT LOCA
Products series Maximum temp (F) Max Environment Pressure (Psi) Qualified standards
NP 450 68 IEEE
NT 500 (for HELB) & 420 ( for LOCA) 113 AP1000 & IEEE
Comparison table:
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NT line extension Leveraged lessons from NT AP1000 testing
– Molded coil – Internal diode – QDC – Reverse flow – NT 8316 ( ¾ & 1 inch) – Increased qualified thermal life