Testing of Carbon Filters in Australian

Transcription

1 Testing of Carbon Filters in Australian Nuclear Installations 31st International Nuclear Air Cleaning Conference, Charlotte NC 19-21July 9 Ju y Luis Rudenas Engineering & Technical Services Australian Nuclear Science and Technology Organisation

2 Carbon filter tests objectives Prevent reactor shutdown due to carbon filter failures Trained workshop personnel available at any time to refill carbon filters Easy to understand instructions to test filters by maintenance personnel New filter housing upgrades with modular designs of canisters and fire suppression Filtration system tested and reliable. Stack monitoring to check effectiveness

3 Adopted standards for assembling and testing filters at ANSTO ASME AG-1 Code on Nuclear Air and Gas Treatment ASTM Standard Test Method of Nuclear-Grade Activated Carbon ASME N Testing of Nuclear Air Treatment Systems ASME N Nuclear Power Plant Air-Cleaning Units and Components

4 Test of carbon filters Injection and sampling manifolds properly designed Air distribution test Aerosol uniformity test Mechanical integrity test, pulses of 1 Bromobutane Advantage of gas pulse is less gas used and the test can be repeated immediately Gas pulse test complemented by laboratory test t of installed canisters or by direct carbon sampling of filters

5 Response to carbon test results ASTM test failure requires carbon filters to be replaced Mechanical test failure requires filters to be reinstalled or replaced Availability of carbon with valid ASTM Certificate (5 years) Spare filters with valid certificate (5 years if never used)

6 Carbon filters used at ANSTO SIAM filters size 17.5 X 17.5 and 10 carbon depth, capacity 100 cfm. Area= 2.2 Sq. Ft. B23 Filters 24 X 24 and 10 carbon depth, capacity 200 cfm. Area= 4 Sq. Ft. Type IV (Flanders V-Bed) 24 X 24 and 2 carbon depth, capacity 700 cfm. Area= 16 Sq. Ft. Type IV (Flanders V-Bed) 24 X 12 and 2 carbon depth, capacity 500 cfm. Area= 8 Sq. Ft. Type IV (Flanders V-Bed) 24 X 24 and 1 carbon depth, capacity 1000 cfm Canisters used at ANSTO, 2 or 10 carbon depth and 2 internal diameter

7 Carbon filter ready for refilling Welded Screw

8 Facility to assemble filters Extract Ventilation Carbon Hopper Vibratoryy Table Scale

9 Pouring g carbon in the Filters

10 Removing g air after filling g filter

11 Crates designed for internal transport

12 Confined space arrangement Demountable rollers for filter installation

13 Filter handling in a confined space

14 ASTM test Direct sampling from filter Sample container

15 Two installed carbon canister modules 2 Canister 1 Pipe 2 Pipe Carbon Filters Air flow direction

16 Canister preparation 1 Pipe p Upper plenum Lower plenum Flow Check Points 2 Pipe to 2 housing

17 Different canister layout y Air flow 2 Pipe 1 Pipe Upper plenum Carbon Filters Lower plenum

18 Instruments for carbon testing NUCON Model HGPH Pulse Mode Halide Generator NUCON Model F-2000-HD ppm and ppb halide detector NUCON Model F-2000-BBD ppb halide detector NUCON Model F-1000-CR calibration rig to calibrate the halide detectors t Calibration gases 200 ppb and 36 ppm of 1 Bromobutane with corresponding clean air cylinders supplied by NUCON.

19 Testing set up Testing Pulse gas Portable fan assembly generator arrangement Portable HEPA filter/ fan assembly 50 mm ID hose From building exhaust Injection manifold Upstream sampling manifold Exhaust ppm ppb outputs Halide detector Halide detector In In Carbon filter under test Downstream sampling manifold Fan Portable HEPA filter/ fan assembly

20 Halide injection pulse test 1 ml of liquid 1 Bromobutane is equivalent to ml of gas at 20 o C 2238 L/s of air flow has 100 ppm of 1 Bromobutane gas when 1 ml of liquid is injected in one second Always measure upstream concentration to ensure proper gas injection and calculate penetration. Penetration = 100*Cd/Cu Maximum allowed penetration at ANSTO is 1% The downstream concentration may exceed the instrument t range when the carbon filter leaks

21 Copper testing manifold

22 Fitting 2 BSP of internal diameter to be pop riveted to a duct

23 Installing the testing manifold

24 Calibration gases ppm and ppb of 1 B Bromobutane b with i h clean l air i cylinders li d

25 Gas detectors ppm and ppb

26 Gas leak investigation in a side removable plate of a new filter ppb of 1 Bro omobut tane Injection time Time in minutes

27 Carbon filter housing requirements Canisters for surveillance testing Injection and sampling manifolds Inlet and outlet plenums Fire suppression Bubble tight dampers to isolate filters in case of fire or for maintenance purposes Carbon Monoxide sensors Thermocouples

28 Thermocouple activated water flood for fire suppression Air flow Keystone valve Sprinklers p 1 pipe Carbon filters Thermocouples 10 Long 10 canisters

29 Fire suppression for Cyclotron Canisters Thermocouples Air flow HEPA filters CO Sensors C b filt Carbon filters Keystone Valve

30 Fire suppression for Hot Cells Valve actuator Keystone Valves Canisters Air flow HEPA filters Thermocouples CO Sensor Carbon filters

31 Fire suppression panel CO and type K thermocouples CO Monitor Thermocouple displays

32 Stack monitoring Air flow rate monitoring using Flow Bar devices Off-line weekly monitoring using TC45 carbon cartridges for gases and Whatman filter papers for particulates Real time monitoring i for noble gases using NaI sensors and a Canberra Lynx multi- channel analyser

33 Equipment for stack monitoring Pressure alarm Stack sample line Stack air flow rate 100 ml Al container Lynx MCA NaI sensor Flowmeter Computer Flow signal Motor Pump Air flow 5 L/min Return line to stack Temperature controlled cabinet

34 Air flow rate device Flow bar Calibration nutserts

35 Display of stack flow Alarm pressure switch Flow display

36 Stack sampling TC45 & filter p paper p weekly sampler Pitot tube Sampling lines for real time

37 Performance of TC45 carbon cartridges Retention n Efficie ency CH H3I % TC12 TC30 TC45 Flow Rate (SCFM) Reproduced from HiQ data

38 Real time stack monitoring Operating System Platform Independent Real-time Monitor GBq MCA based program for looped endless measurement Date / Time 7:39 8:40 9:40 10:41 11:41 12:42 13:42 14:43 15:43 16:44 17:44 18:45 19:46 20:46 21:47 22:47 23:48 0:48 1:49 2:50 3:50 4:51 5:51 Time Xe 133 (5.3d) Kr 85m(4.5h) Kr 88(2.8h) Xe 135(9.2h) Kr 87(76m) Xe 135m(15m) MCA desktop desktop Internet Browser Based: Data Display Cumulative totals Data Base On-line data Spreadsheet format export notification equipment failure notification levels daily totals Network Server ANSTO Network Firewall Internet

39 Top view of NaI sensors for real time stack monitoring NaI sensor Shielding for sensors

40 Cabinet for stack monitoring g Computer Lynx Canberra MCA UPS Shielded NaI sensor

41 Real time stack monitoring display Gamma Spectrum kev

42 Conclusions Correctly design new filter housings with canisters, testing manifolds, bubble tight dampers and CO monitors Periodically test the carbon filters and be prepared for filter changes at any time Monitor filter performance with trends of weekly and real time releases through the stacks

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