Weed Model DTN2070. Differential Pressure Transmitter. Nuclear Qualified

Transcription

1 Nuclear Qualified Weed Model DTN2070 Differential Pressure Transmitter Advanced thin film metal strain gauge sensor technology All stainless steel housings, non-painted Seismically qualified stainless steel mounting brackets Loop powered, 2 wire, 4-20 ma 1/4-inch NPT process connections Dustproof and waterproof construction; no humidity effect DELIVERING CRITICAL MEASUREMENTS

2 Model DTN2070 Absolute/Gauge and Differential Pressure Transmitters Overview The DTN2070 is the latest Class 1E pressure transmitter designed for harsh nuclear and manufactured by Ultra Electronics, Nuclear Sensors & Process Instrumentation ( Ultra NSPI ). Introduction Ultra Electronics Model DTN2070 Pressure Transmitters provide precision pressure measurements in nuclear applications requiring reliable performance and functional safety. The instruments are Class 1E qualified to IEEE and IEEE The DTN2070 transmitter contains only analog electronics utilizing a diaphragm isolated direct coupled strain gauge pressure sensor capsule. The DTN2070 transmitter is updated to meet the most stringent environmental requirements of Gen III+ reactors for harsh operating environments and post accident monitoring applications inside containment. The DTN2070 has undergone its own complete seismic and environmental qualification. While the transmitter has been updated over the years to improve performance and to deal with component obsolescence, the sensing capsule of the DTN2070 (Westinghouse Veritrak/ Tobar/ Camille Bauer Model 32, and most recently Weed Instrument DTN2010 and N97) is the same basic field proven design as the Model 32 originally qualified in The DTN2070 is a form, fit and function replacement for the N97 and DTN2010. Features Advanced thin film metal strain gauge sensor technology All stainless steel housings, non-painted Seismically qualified stainless steel mounting brackets Loop powered, 2 wire, 4-20 ma ¼ inch NPT process connections Dustproof & waterproof construction; no humidity effect Quick disconnect electrical connectors (fully EMI shielded) DP Overpressure protection (2,500 psig on one side without damage) DP capsules are filled with high performance radiation tolerant silicone fluid PA/PG transmitters have a vacuum behind the sensor diaphragm, no fill fluid Field adjustability externally accessible ports for span and zero adjustments Factory temperature compensation 100% tested to 300ºF (149ºC) Installation and Instruction and maintenance manuals No special tools required for installation, 2mm slot screwdriver for zero and span adjustment No detrimental/prohibited materials, halogen surface contamination (chloride and Fluoride) less than 15 micrograms/dm2 Cleanliness acc. to RCC-M Nuclear quality assurance, reference files, quality plan, traceability, materials certifications, FAT, CoC, EOMR & Follow-up documents True analog design no microprocessor or firmware/software Nuclear Qualified IEEE Environmental Qualification; IEEE Seismic Qualification 36.5 MRAD (365 kgy) TID with DBA dose rate to 1.2 MRAD/hr-air (12 kgy/hr-air) Abnormal event, seismic, LOCA, submergence and post accident monitoring 2

3 Weed Model DTN2070 Differential Pressure Transmitter Sensing Technology & Operation The unique advanced ultra-stable vacuum deposited thin film metal strain gauge sensing technology makes the DTN2070 ideally suited for use in harsh and mild environments in nuclear power plants. The all stainless steel exterior construction enhances the rugged design permitting the transmitter to be used in virtually all areas of the plant. An embedded temperature sensor gives the transmitter an accurate response to process changes during normal operation and accident conditions. The DP transmitter s measuring capsule is essentially a thin isolation diaphragm mechanically coupled to an ultra-stable thin-film metallic resistance sensing element vacuum deposited on a flexing beam. The process pressure is transferred to the flexing beam, causing the thin film resistance-sensing element to alter its electrical resistance. This resulting change is monitored by a highly accurate, temperature compensating amplifier and converted into a 4-20 ma signal proportional to the applied pressure. The PA/PG transmitter s measuring capsule is a smaller, thicker metal diaphragm which directly contacts the process fluid. The ultra-stable thin-film metallic resistance sensing element is vacuum deposited on the back side of this diaphragm. A vacuum is then pulled on this back side, isolating it from the environment. Therefore the PG capsule is known as a sealed gauge capsule since its vent side is actually a sealed vacuum. The process pressure applied to the diaphragm causes the thin film resistance-sensing element to alter its electrical resistance. This resulting change is monitored by a highly accurate, temperature compensating amplifier and converted into a 4-20 ma signal proportional to the applied pressure. The only difference between the PA and PG transmitter is that the PG transmitter is electrically trimmed at the factory so that at ambient barometric pressure, its output is zero (4 ma). 3

4 Key Component Features and Sensing Technology Differential Pressure Sensor Absolute and Gauge Pressure Sensor 4

5 Weed Model DTN2070 Differential Pressure Transmitter Dimensional Drawings DTN2070 PA/PG and DP 5

6 Available Capsule Ranges Differential Pressure - Table 1.0 in kpa Diaphragm Material Max Working Pressure* Hastelloy - C Hastelloy - C Hastelloy - C 2,500 psi Stainless 17-7PH Stainless 17-7PH Absolute/Gauge Pressure - Table 1.1 PSI kpa Diaphragm Material Max Working Pressure* Stainless psi ,379 Stainless psi ,447 Stainless psi ,342 Stainless ,250 psi* ,237 Stainless ,750 psi* ,368 Stainless ,250 psi* * MAWP = 1777 psi for Canadian/TSSA Class 6 installations Power Supply Load Limitations, 4-20 ma 6

7 Weed Model DTN2070 Differential Pressure Transmitter Specifications Table 2.0 Performance Specifications (Reference Conditions) Reference Accuracy Ambient Temp. Effect (DP) per 50 F (27.8 C) Ambient Temp. Effect (PA/PG) per 50 F (27.8 C) Stability/Drift Static Pressure Zero Effect (DP) Overpressure Effects (zero base) Field Adjustability (Zero & Span) Operating Temperature Storage Temperature Limits Output Signal Response Time Power Supply Effect Power Supply Load Limitations ± 0.25% of span (includes Linearity + Hysteresis + Deadband & Settability + Repeatability) Mild Environment or Rad Harsh Transmitters ±.50% of URL Harsh Environment Transmitters, 40 F to 130 F, (4.4 C to 54.4 C) ± 0.6% of URL + 0.4% for 100 in H 2 O & 250 in H 2 O Models ± 0.6% of URL + 0.4% for Model 611 only ± 0.35% of URL + 1% for all other 650 in H 2 O Models Harsh Environment Transmitters, above 130 F, (54.4 C) ± 0.70% of URL Mild Environment or Rad Harsh Transmitters ±.75% of URL Harsh Environment Transmitters, 40 F to 130 F, (4.4 C to 54.4 C) ± 0.8% of URL + 0.3% Harsh Environment Transmitters, above 130 F, (54.4 C) ± 0.52% of URL +.2% ±0.225% of URL per 12 months at reference conditions. ±0.50% of URL per 30 months at reference conditions. ± 0.25% of URL for 1,000 psi (6.89 MPa) static pressure change. This effect can be calibrated out after lines are pressurized. Maximum zero shift is 0.25% of URL at 1.5 times URL pressure (PA and PG) Maximum zero shift is 0.25% of URL per 1,000 psi [6.89 MPa] for DP transmitters one direction, (1.0% of URL, both directions). ± 15% of span for all models. (except for model DTN2070DPD612 which has a -44% to + 15% zero adjustability). 40 to 257 F (4.4 to 125 C) normal services. Operating temperatures will affect qualified life. -40 to 257 F (-40 to 125 C). Storage temperatures will affect qualified life ma two wire Sensor response time to 50% with a 100% of span step change at 100 F, [37.8 C] PA/PG: 0.2 second DP: 40 inh2o, 2.5 seconds DP: 100 inh2o, 0.7 seconds DP: 250, 600, 800 inh2o, 0.4 seconds 0.005% of calibration span/volt 18 VDC to 48 VDC (Mild); 18 VDC to 33 VDC (Harsh) R (Ω) = Maximum field loop Resistance = 45.5 * (Power Supply Voltage - 18) Maximum load resistance (R) is determined by the voltage level of the external power supply. The load resistance is the sum of the resistances of all connected receivers and the connection lines. The transmitter produces an output that ranges between 4-20 ma DC. Within limits set by the line voltage, this output current is independent of load resistance. The transmitter amplifier operates satisfactorily with line voltages and loop resistance as shown. See Figure 18. 7

8 Nuclear Specifications Nuclear Qualification Summary - Table 3.0 Qualification Test Post Thermal aging and Wear Aging Comments For a 6 year life at service temperature of 120ºF (49ºC) see Qualified Service Life vs. Temperature chart. 95/95 limit ± % of URL During Radiation aging 36.5 MRAD TID (0.8 to 1.2 MRAD/hr rate) 1.2% Post Radiation aging 36.5 MRAD TID 1.2% During Abnormal Event Cycle 265ºF (129.4ºC) Ambient humidity and pressure. After thermally stable, unforced ramp to room temperature. 2.5% Post Abnormal Event Cycle 265ºF (129.4ºC) Ambient humidity and pressure. After thermally stable, unforced ramp to room temperature. 0.3% During five OBE runs at ½ SSE levels See SSE Seismic profile 0.5% During SSE Seismic Test See SSE Seismic profile, Figure % Post Seismic 0.2% During Containment Pressure Test During LOCA 1.1% 15 cycles of vent to psi (468.8 kpa) 0.3% First 15 days & Submergence 4.0% for DPs 3.7% for PA/ PGs During PAMS Post Accident Monitoring (PAM) Last 43 days 2.7% 8

9 Weed Model DTN2070 Differential Pressure Transmitter Nuclear Qualification Testing Details Thermal/Wear Aging The purpose of accelerated thermal aging is to put the transmitter in a condition which simulates the end of a service life condition. Pressure cycling is not a limiting factor for the qualified life. The qualification testing for the Model 32 DP (DTN's predecessor) included mechanical aging of sensor capsules up to 19 million cycles without any failure. Subsequent mechanical aging tests: N97 200,000 pressure cycles DTN ,000 cycles DTN2070 5,000 cycles Previous testing and operating experience demonstrate small operating pressure fluctuations and cycling is not a significant aging mechanism. Qualified Service Life vs. Temperature DTN2070 Service Life vs. Temperature ( C) DTN2070 Service Life vs. Temperature ( F) Service Life 20 Service Life Service Temperature Service Temperature Radiation Aging The purpose of Radiation aging is to put the transmitter in a condition which simulates the end of a service life condition and DBE accident radiation, including margin. Radiation TID and Dose Rate Transmitters were subjected to 36.5 MRAD TID by exposure to Cobalt 60 sources such that the items receive a total integrated dose in a homogeneous exposure as is possible throughout the volume. Dose rates are between 0.8 to 1.2 MRAD per hour. Beta Radiation Testing not required. Enclosures offer total protection from beta radiation originating from outside the enclosure. Abnormal Event/Thermal Cycle Abnormal Event postulated to occur every 12 years; the transmitters were subjected to one abnormal event. Rapid (5 minute) ramp followed by a dwell at 265ºF, (129.4ºC), for at least 2 hours for the transmitters to reach thermal equilibrium, then unforced cooling return to ambient. 9

10 Seismic Qualification Independent tri-axial shake table with simultaneous random seismic inputs utilized for testing. Resonance Frequency Search A uni-axial sinusoidal excitation of 0.2 g was input into each of three principal axes of the test items. The response of the test items were monitored with uni-axial accelerometers mounted at appropriate locations in the direction of excitation. Random Motion Tests Random motion tests were performed by inputting random excitation from 1 to 100 Hz simultaneously in the vertical and the horizontal axes of the test fixture. Random motion tests were performed such that the motions of the axes are uncorrelated. The test response spectra (TRS's) envelop the RRS with the 1.32 margin factor. Five (5) consecutive tests at the OBE (½ SSE) level, each 30 seconds in length, at 5% damping. One (1) test performed at the full SSE level, 30 seconds in length at 5% damping. See table 4.0 for the summary of the results. Seismic Spectra 100 Seismic SSE Test Response Spectra TRS (5% Damping, includes 32% margin) Acceleration (g) 10 RRS (includes 32% margin) 1 1 Frequency (Hz)

11 Weed Model DTN2070 Differential Pressure Transmitter Containment Pressure Test The objective of the Containment Pressure Test is to verify the effect of high ambient pressure on the test transmitters. This test was performed in the LOCA chamber prior to LOCA testing; 68 psig (82.7 psia) applied to the sealed LOCA chamber and held for 3 minutes. Then the chamber was vented. [Once the chamber pressure is at its vented pressure, the vent is closed and the 68 psig (82.7 psia) was applied to the chamber and held for 3 minutes.] The LOCA chamber was pressurized in this manner a total of 15 times. After the last time, the chamber was vented and a Post containment pressure functional test conducted. LOCA/MSLB Operation Loss of Coolant Accident (LOCA) The objective of the LOCA simulation is to verify the capability of the test transmitters, in an end of life condition, to perform their safety-related functions during Design Basis Accident (DBA) conditions. The LOCA test envelops the HELB and MSLB conditions so only the LOCA test needs to be performed. See Table 3.0 for qualification's specifications. Chemical Spray A chemical solution was introduced into the chamber within an hour of starting the test. The specified ph level and time interval during the next 24 hours of the test simulate the chemistry of the reactor coolant system fluid. The initial maximum ph is 4.5. The solution, consisting primarily of boric acid, was injected for one hour. The ph of the spray for the subsequent 23 hours is between 8.58 and 8.64 including margin. Adjustments in the standing fluid in containment are considered as part of the submergence. Submergence At the approximate 25 hour mark, the bottom of the LOCA chamber was flooded to submerge selected test specimens. Post Submergence At the approximate 361 hour mark of the LOCA test, the LOCA chamber was cooled, the liquid drained, and its ambient pressure reduce to 0 psig. Once the transmitters were at room temperature for at least 2 hours, a function test was run on all transmitters before any of them are removed from the LOCA chamber. Post-Accident Monitoring The post-accident 4 month aging duration was adjusted so that a 4 month-loca/mslb operation service condition was simulated in less than 4 months. The final chemistry solution, (2428 ppm B Boric acid, 7.53 g/l TSP, ph 8.61) was injected into or contained in the test chamber as needed to maintain 100% RH. (See Table 5.0.) 11

12 5.9 LOCA, PAMs Profile Temperature, Degrees C, Chamber Pressure, psig includes margin DTN2070 DBA & Post DBA Test Profile DBA & Post DBA Temperature Target DBA & Post DBA Chamber Pressure, psig E E E E E E E E E+07 Test Time, Seconds Post Accident Aging Temperature & Pressure Profiles - Table 5.0 Elapsed Time Minimum Temperature Minimum Pressure (Seconds) ( F) ( C) (psia) (psig) (bar) (kpa) , ,690,

13 Weed Model DTN2070 Differential Pressure Transmitter Transmitter Model Matrix Table 6.0 DTN2070 Differential Pressure Transmitter Transmitter Type DP Differential Pressure - Output Action - D Direct Acting output (default) - R Reverse Acting Output - - Model Range Code - - Range Units DP DP inches H 2 0 DP DP inches H 2 0 DP DP inches H 2 0 DP DP inches H 2 0 Transmitter Type PA Absolute Pressure PG Gauge Pressue - Output Action - D Direct Acting output (default) - R Reverse Acting Output - - Model Range Code - - Range Units PA/PG psia/g PA/PG psia/g PA/PG psia/g PA/PG psia/g PA/PG psia/g PA/PG psia/g Electrical Connection G EGS Quick disconnect connector Options Electrical Connections, Field Side MX X feet of field side cable Mounting A Wall mount, DP only (mounting bracket is integral on PA/PG) Remote Seals/capillaries SX X feet capillary, water filled Consult Factory Special Materials of Construction H Consult Factory Process Connection FS Special Other Specials SP Consult Factory DTN2070 DP D 300 G -M10 A Sample Model Number 13

14 DELIVERING CRITICAL MEASUREMENTS Ultra Electronics NUCLEAR SENSORS & PROCESS INSTRUMENTATION 707 Jeffrey Way, PO Box 300 Round Rock, TX USA Tel: This document is not intended to serve as a design document and is subject to change. Actual specifications are per customer order. Ultra Electronics reserves the right to vary these specifications without notice. Ultra Electronics Printed in USA Pub /13