Nuclear Qualified Draft Range Differential Pressure Transmitter

The N-DR800 is a nuclear qualified draft range differential pressure transmitter designed for use in Nuclear power plants for very low pressure measurements such as HEPA vent filter, HEPA filter discharge flow, control room air, containment pressure, scrubber/pre-concentrator demister, rad waste evaporator, vent stack monitoring, turbine building DP, main chimney flow, and other low range pressure monitoring applications.

Th N-DR800 differential pressure transmitter made in partnership between Validyne Engineering and Ultra Energy, is a nuclear qualified analog loop powered transmitter for very low-pressure measurement. It has a full-scale range as low as ±0.25” H2O, making it ideal for air flow control applications. It can be turned down to ±0.1” H2O; higher full-scale ranges to ±100” H2O are available. The DR800 offers 0.5% accuracy and an operating temperature range of -20°F to +185°F. The total combined temperature effects are less than 3%/100°F.

Construction

• Gasketed, threaded covers on the electrical enclosures (NEMA 4 enclosure).
• Dual electrical cavities in the electrical housing keep field wiring separate from the electrical compartment.
• ¼” NPT female pressure connections on 2.125” centers
• Pressure connections on front and rear
• Sensor body and wetted parts made from 410 SST
• IEEE 344 Seismic qualified stainless-steel mounting bracket

Nuclear Specifications

IEEE 323/344 Class 1E Mild Environment where seismic is the only design basis event (DBE) of consequence: Seismic qualification envelopes the Generic Seismic Profile per EPRI TR-107330 Figure below with 5% damping horizontal and vertical. EMC Compliance to USNRC RG 1.180.

Reference Standards & Specifications

• IEEE Std. 323-1974/1983/2003, “IEEE Standard for Qualifying Class 1E Equipment for Nuclear Power Generating Stations,” The Institute of Electrical and Electronics Engineers, Inc.
• IEEE Std. 344-1975/1987/2004, “IEEE Recommended Practice for Seismic Qualification of Class 1E Equipment for Nuclear Power Generating Stations,” The Institute of Electrical and Electronic Engineers, Inc.
• EPRI TR-107330, “Generic Requirements Specification for Qualifying a Commercially Available PLC for Safety-Related Applications in Nuclear Power Plants,” EPRI, December 1996.
• MIL-HDBK-217F, Military Handbook: Reliability Prediction of Electronic Equipment

Reliability

Reliability calculations indicate a 95.3% probability that these transmitters will operate for 40 years at 25°C without failure. The test program verified that the specimens can meet or exceed their performance requirements in mild environment applications under normal, abnormal, operational basis event and safe shutdown event conditions.

MIL-HDBK-217F MTBF & Failure Rate

• 25°C (77°F) MTBF 7,274,526 hours (830.4 years); Failure Rate FIT 137.5 (10^9 hours)
• 40°C (104°F) MTBF 5,378,455 hours (614.0 years); Failure Rate FIT 185.9 (10^9 hours)

To find get more information about the N-DR800 nuclear qualified differential pressure transmitter visit the product page for detailed specifications, drawings and more.