NT Performance Features

The NT Series, 3-way diaphragm-operated pilot controlled solenoid valve, is used primarily as a Class 1E safety-related pilot operator on larger control valves in nuclear power plants.
Qualification Report AQR 35115-3/AQR 100115

Features

• Elastomers (diaphragm, gaskets, o-rings, discs): resist high radiation, high temperature degradation effects
• Designed for integration into digital controls
• High flow and reverse flow capabilities
• DC valves have suppression diode
• Quick Disconnect Connector (QDC)*
• Field side connector supplied with up to 30 ft. leads, with a temp rating of 392°F (200°C)*
• One piece solenoid/coil design for ease of maintenance

*See Coil and connector order page

Environmental Qualifications

• IEEE 323-1974/1983/ 2003
• IEEE 382-1996/ 2006
• EMC Type Testing: Meets Regulatory Guide 1.180
• Up to 170 Megarads Gamma Radiation
• 20,000 Mechanical Cycles

Design Basis Event

• HELB: 14 days @ 485°F (251°C) Peak plus 30 days post accident aging , covers
  AP1000 Zones 5 & 10
• LOCA: Double Peaks, 30 days @ 440°F (227°C) Maximum, covers IEEE23-1983/2003;
  AP1000 Zone 1, Groups 2, 3, 7, 9 (Mild Environment), Group 6 (Harsh Environment)
  Seismic Qualification
• IEEE 344-1975/1987/ 2004
• Required Input Motion (RIM) Operation Basis Earthquake (OBE): 4.0 g peak; Safe Shutdown
  Earthquake (SSE): 6.0 peak at 2.0-64.00 Hz
• Certified Seismic Design Response Spectra (CSDRS) & Hard Rock High Frequency (HRHF)
  SSE input: 6.0 g''s @ 5% damping