ML20202G204
| ML20202G204 | |
| Person / Time | |
|---|---|
| Site: | Portsmouth Gaseous Diffusion Plant |
| Issue date: | 01/15/1999 |
| From: | UNITED STATES ENRICHMENT CORP. (USEC) |
| To: | |
| Shared Package | |
| ML20202G195 | List: |
| References | |
| NUDOCS 9902050048 | |
| Download: ML20202G204 (37) | |
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NUCLEAR REGULATORY COMMISSION CERTIFICATION PORTSMOUTH GASEOUS DIFFUSION PLANT USEC-02 REMOVE / INSERT INSTRUCTIONS Revision 28 Remove Pages Insert Pages Volume 1 LIST OF EFFECTIVE PAGES i / ii i/ ii y through viii y through viii xv / xvi xy / xvi TABLE OF CONTENTS xi / xii xi / xii SECTION 3.1 3.1-155 through 3.1-162 3.1-155 through 3.1-162
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'Q 3.1-289 / 3.1-290 3.1-289 / 3.1-290 3.1-341 / 3.1-342 3.1-341 / 3.1-342 3.1-347 through 3.1-350 3.1-347 through 3.1-350 Volume 2 TABLE OF CONTENTS xi / xii xi / xii SECTION 4.1 4.1-68c / 4.1-68d 4.1-68c / 4.1-69d Volume 4 LIST OF EFFECTIVE PAGES li through iv il through iv SECTION 2.7 2.7-15 2.7-15
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LIST OF FIGURES Chapter 3 (Continued)
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3.1.1.10-3'
. Valving Control Board.......... '.......................... 3.1-279 3.1.1.10 PCF Floor Plan...................'......................
3.1 280.
3.1.1.10-5 Interior of the PCF......................................
3.1-281 3.1.1.11-1 CADP Systems Monitors................................... 3.1-282
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13.1.1.11 2
' Locations of X-333 Outleakage Detector Heads e..................
3.1-283 3.1.1.11-3:
Locations of X 330 Outleakage Detector Heads...................
3.1-284 3.1.1.11-4 Typical Outleakage Detection Monitor Mimic Panel................
3.1-285 3.1.1.11-5.
Unit Interface Cabinet....................................
3.1 286 y
3.1.21, Location of the Purge Cascade in the X 326 Process Building..........
3.1-287 3.1.2-2 Top and Side Purge Cascades and Auxiliary Systems............... 3.1288 3.1.2-3a Purge Cascade and Bypass Piping............................
3.1 289 3.1.2-3b Purge Cascade and Bypass Piping...........................
3.1-289b j
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3.1.2-4 Typical Purge Cascade Cell................................ 3.1 291 s
F 3.1.2-5 Purge Cascades Booster and Orifice Stations........ s 3.1-292
- 3.1.2-6a Top Purge Booster Station Concentration Recycle and Orifice Station
" Instrumentation........................................
3.1-293 3.1.2-6b Top Purge Booster Station Concentration Recycle and Orifice Station
' Instrumentation '........................................
3.1 -295
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3.1.2-7 :
Side Purge Booster Station Concentration Recycle and Orifice Station I nstrumentation '........................................
3.1 -297 3.1.2-8 Purge Cascade Configuration '...............................
3.1-298 3.1.2 9' P.G. Freezcout Conditions..................................
3.1 299 3.1.2-10.
Top Purge Booster. Stations................................ 3.1 -300 -
3.1.2-11 Side Purge Metering Station................................ 3.1-301 3.1.2 12
- Chemical Trap Station....................................
3.1-302 3.1.2-14,
' Tyoical Cell Cubicle.....................................
3.1 303
.3.1.2 16 PCF Controls for the Purge Cascade..........................
3.1-304 3.1.2-17.=
Typical Purge Cascade Gradients..................,.........
3.1-305 l
3.1.2-18 5-inch Can Storage Area for Waste Material........,............ 3.1-306 I
3.1.3 1-Locations of Freezer / Sublimer Systems in the X-333 Process Building....
3.1-307 3.1.3-2.
Freezer / Sublimer Safety and Control Systems.................... 3.1-309 3.1.33:
Operating Conditions for UF Freezer Mode..................... 3.1-311 3.1.3-4:
Operating Conditions for UF. Sublime Mode.....................
3.1-312 l 3.1.3 5 '
Operating Conditions for UF Cold Standby Mode.................
3.1-313 i
3.1.3 Operating Conditions for UF Hot Standby Mode.................
3.1-314 i
- 3.1.3 Operating Conditions for UF. Modified Hot Standby Mode...........
3.1-315
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3.1.3-8 Operating Conditions for Cold Trapping UF, From UF,-Freon Mixtures..
3.1-316 3.1.4-1 X-330 Cold Recovery Llagram..............................
3.1-317 L3.1.4-2 X-333 Cold Recovery Diagram............................... 3.1 319 3.1.4-3 CIF Phase Diagram 3.1-321 j
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SAR-PORTS January 15.1999 Rev.28 O
LIST OF FIGURES Chapter 3 (Continued)
Figure Page 3.1.4-4 Simplified Cold Trap Control Diagram......................... 3.1-322 3.1.4-5 Space Recorder Constants for Lower Assays.....................
3.1-323 3.1.4-6 Allowable Vent Stream Concentrations.........................
3.1-324 3.1.4-7 Regeneration Panel......................................
3.1-325 3.1.4 8 X-330 Cold Recovery Area.................................
3.1-326 3.1,4-9 X-333 Cold Recovery Area.................................
3.1-327 3.1.4-10 Typical 5-Inch Cold Trap..................................
3.1-328 3.1.4-11 X-330 Cold Trap Design and Instrumentation....................
3.1-329 3.1.4-12 Instrumentation Panel for Storage Drums and Cold Traps...........
3.1330 3.1.4 13 S urge Drums..........................................
3.1 -331 3.1.4-14 Holding Drum Valve Manifold..............................
3.1-332 3.1.4 15 X-330 Chemical Trap Room....................,...........
3.1-333 3.1.4-16 X-330 Surge Drum Room..................................
3.1 334 3.1.4-17 Typical Refrigeration Unit.................................
3.1-335 3.1.4-18 X-330 CIF Storage Pig....................................
3.1-336 3
3.1.4 19 X-330 Space Recorder Flow and Control Instrumentation Diagram..... 3.1-337 3.1.4-20 CIF Flow Control to the Space Recorder.......................
3.1-338 3
3.1.4-21 Typical Cold Trap Heater Control Schematic for X-330 Cold Trap "A"...
3.1-339 3.1.4-22 Pressure-Temperature Diagram of Process Gas...................
3.1-341 3.1.5-1 New Freon Degrader Piping Layout...........................
3.1-342 3.1.5-2 1sometric View of the New Freon Degrader and Housing.............
3.1-343 3.1.5-3 New Freon Degrader Flow and Instrument Diagram...............
3.1 345 3.1.5-4 Operating Floor Freon Degrader Local Control Panel-Sheet I........
3.1-347 3.1.5-4 Operating Floor Freon Degrader Local Control Panel - Sheet 2........
3.1-348 3.1.5-5 Operating Floor Freon Degrader Flow and Instrument Diagram....... 3.1-349 3.1.5-6 Operating Floor Freon Degrader Containment Shell, Filter Containers and Connecting Piping.......................................
3.1 -350 3.2-1 Locations of UF. Feed, Withdrawal, Sampling. Handiing and Cylinder S t ora ge............................................... 3.2 -84 i
3.2-2 Basic UF. Cylinder Flow Scheme.............................. 3.2-85 3.2-3 Feed / Sampling Autoclave Piping (Typical for One Autoclave).......... 3.2-86 3.2-4 X-343 Autoclave......................................... 3.2-87 3.2 5 Diagram of a Typical Feed and Sample Autoclave.............,,.. 3.2-88 3.2-6 Diagram of a Typical Feed Autoclave........................... 3.2-89 3.2-7 Drawings of Typical Cranes................................. 3.2-90 3.2-8 Diagram of a Typical Sampie and Transfer Autoclave............... 3.2-91 3.2-9' X-29-4 Side Feed Station................................... 3.2-92 1
3.2-10 ERP an d LAW Flow Diagram................................ 3.2-93 3.2 11 Tails Withdrawal Flow Diagram.............................. 3.2-94 O
xii
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SAR-PORTS September 15. 1995
/
1 Rev.1 L.)
filter containers are built with extra capacity so the filters can be backflushed to extend the onstream time between filter removals.
When one filter is removed for cleaning, the remauung one is valved onstreans.
Process Gas Return Unes After passing through the filter, the product gases pass through an outlet flow control valve which automatically throttles the flow to mamtam system pressure at a desired value. The product gases then flow to the Top Purge Cascade through the existing Freon degrader return manifold, which is located adjacent to Cell 16 arx! is maintamed at compressor suction pressure. The return point is at a slightly lower pressure than the supply point; the pressure differential is the motive force for flow through the degrader system.
Imulated Enclosure The mixer, degrader vessel, particulate filters, and associated piping and valves are located in a nominal 10-foot by 13-foot by 15-foot-high insulated degrader enclosure. The enclosure walls, fabricated from a three-inch layer of insulation located between two steel metal-skin surfaces, are similar to the cell housing walls. The enclosure has a removable roof to facilitate equipment removal.
Instrumentatip.gand Controls 1
The gas flows to the degrader system are controlled from ACR-6. The ACR-6 control panel includes (O) a process graphic display, valve controls, instrumentation, a multiple-point temperature recorder, an
~
annunciator panel, and alarms. The rates at which process gas / coolant, fluorine, and nitrogen enter the degrader system should be regulated by the operator to achieve a molar ratio of approximately 1:5:12, respectively. The coolant flow rate is reguhted by an inlet valve and can be measured by a thermal mass flowmeter The fluorine flow rate is controlled by an inlet valve and four parallel capillaries, each sized and calibrated to maximum flow rates of 25,50,100 and 200 scfd (standard cubic feet per day) at the fluorine supply header pressure. The building supply header receives fluorine from X-342-B storage drums. The outlet pressure of the drums is reduced to 9.5 psig by a pressure-indicator-controller. A flow meter, computer-compensated for density changes due to temperature and pressure variations, continually monitors and indicates the fluorine flow rate into the degrader system. The nitrogen diluent flow rate is controlled by a four-branch capillary system similar to the fluorine system. The fluorine and nitrogen capillaries, the coolant 3upply and fluorine flowmeters, and the associated valves are mounted on a panel that is accessible from outside the degrader enclosure. A nitregen flush system, as described in the Monitoring and Protection Systems section, is provided to flush and cool the system.
The New Freon Degrader System includes instrumentation for monitoring pressures, temperatures, flow rates, valve positions, and electrical power consumption rates.
' Pressure indicators are provided to allow monitoring the pressure of fluorine, coolant, and nitrogen supply, degrader vessel outlet, degrader vessel shell, filter, and feturn line. If the degrader vessel pressure reaches 5 psia, an automatic system shutdown, required for operational purposes, will be t-f 3.1-155
SAR-PORTS January 15,1999 Rev. 28 initiated. This system includes coolant and fluorine supply valve closures, heater power shutdown, and alarm indications in ACR-6.
The pressure drop across the onstream filter is monitored to give an indication of the extent of filter plugging. As the filter plugs the pressure drop will increase, the capacity of the outlet control valve to regulate system pressure will be reduced, and combustion will become difficult to sustain.
The nitrogen buffer pressure is monitored so that a leak in the buffer system, which could be either into the degrader vessel or out to the atmosphere through the shell or shell flange, will be indicated in ACR-6.
The cascade operator should be able to determine the actual condition by observing other operating pressure readings.
If the fluorine header pressure at the inlet to the Cell Floor Freon Degrader reaches 4.5 psig, a I
pressure switch will actuate an alarm light on the ACR-6 panel and alert the operator, if the fluorine header pressure reaches 5.0 psig, another pressure switch will cause the fluorine supply valve to close.
l Thermocouples are used to monitor temperatures of the degrader system at several locations (two on the mixer, one on the degrader vessel inlet line, two on the degrader vessel heating zone, four on the degrader vessel. cooling zone, and one on the degrader vessel outlet line). There are two thermocouples at each location. One of the thermocouples at each location provides input to a multiple-point, strip-chart temperature recorder in ACR-6. The other thermocouple provides input to a continuous temperature monitor in ACR-6.
The monitor has LED digital displays that provide highly accurate end reliable monitoring of the system and has adjustable setpoints for each monitored location to trip alarms and initiate a system shutdown.
An annunciator panel in ACR-6 has the visual alarms for both the monitor and the recorder and will complete a system shutdown upon initiation by the temperature monitor. An audible signal will accompany each visual alarm displayed on the annunciator panel.
One of the thermocouples in the degrader vessel heating section provides input to a silicon-controlled rectifier (SCR) temperature controller, which, in turn, provides electrical energy to the degrader cartridge heaters.
If the temperature of the mixer reaches 300"F, the mixer thermocouples will activate a system, flushmg the mixer with nitrogen to dilute the reactants and cool the mixer Activation of the flush system will be accompanied by an audible alarm and a visual indication on the annunciator panel in ACR-6. The operator, being alened, will be able to adjust reactant flows as necessary to prevent further combustion in the mixer.
In ACR-6 an audible alarm will be actuated and a light on the annunciator panel will indicate when any point monitored by the temperature monitor reaches 1150"F. The cascade operator may adjust the reactant flows or shut down the system depending on his judgment of the rate of temperature rise. When any point on the monitor reaches 1200"F, an automatic system shutdown willTie initiated, in such an event, fluorine and coolant valves will close, the nitrogen flush valve will open, and power to the electric heaters will be shut down.
3.1-156
S SAR-PORTS January 15,1999
)
Rev. 28 wJ Failure of a thermocouple that provides input to the temperature recorder will cause the recorder to indicate 2000'F (upper end of range) and will trip a high temperature alarm in the annunciator. Failure of a thermocouple that provides input to the monitor will trip a high temperature alarm and will initiate system shutdown. With other temperature information displayed on the panels in ACR-6, an operatcr will be able to distinguish between a failed thermocouple and a high temperature condition.
Should temperature in the degrader vessel heating zone drop below 950*F, which is the lower end of the operating range, a low temperature alarm in ACR-6 will activate, indicating that corrective action must be taken by the operator.
Quantitative flow rate indications are provided by instruments in the coolant and fluorine supply lines.
Readotits are provided in ACR-6. If the fluorine flow rate anams 400 scfd (an operational constraint discussed in Section 5.0), an alarm will actuate in ACR-6 alerting the operator to reduce the flow rate.
The heater power readout provides the cascade operator with an indication of heater condition. Heater failures will cause a current drop and will tend to prevent the heater section from achieving the required 800*F needed to initiate the reaction.
De atmosphere within the insulated enclosure is monitored by ionization detectors that are connected to the existing building alarm system. Dese particulate-sensing detectors provide an indication of the presence of fluorine, UF., smoke, and other particulates. A modification of the detectors, accomplished at Portsmouth
(]
GDP, has made the units sensitive to fluorine.
Lj 3.1.5.2 Operating Floor Freon Degrader Facility l
3.1.5.2.1 Location The Operating Floor Freon Degrader is located approximately 150 feet southwest of ACR-6 on the I
operating floor behind the Cell X-25-7-16 LCC (Local Control Center) in the X-326 Process Building. The process gas supply and return lines are routed from the Top Purge Cell, through the cell floor, to the Operating i
Floor Freon Degrader Facility. Process gas / coolant, fluorine, and nitrogen flow rate adjustments are l
performed at a local control panel to maintain proper operating temperature and to insure proper breakdown of the coolant. The panel is equipped with instruments and alarms for monitoring of the operation. In ACR-6 there is a panel with audible and visual alarms, a reset button for the degrader vessel heaters, and an j
emergency shutdown button.
3.1.5.2.2 System Descrintion The Operating Floor Freon Degrader consists of nitrogen, fluorine, and air supply lines; process gas I
supply and return lines; mixer; degrader vessel; degrader shell; two parallel outlet filters; instrumentation; and controls. De local Freon degrader panel is shown in Figure 3.1.5 %. The flow and instrumentation drawing is shown in Figure 3.1.5-5.
A t
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([
3.1-157
SAR-PORTS September 15, 1995 Rev.1 Nitrogen Fluorine. and Air Sunnly Nitrogen, fluorine, and air are supplied by headers in the X-326 Building. Materials and components were selected in accordance with UCC-ND Technical Specification P-1.1, Subsections 117,143, and 136, respecuvely. Nitrogen is utilized as a process diluent and a buffer gas within the degrader shell. Fluorine is used as the oxidizer in the coolant / fluorine degradation reaction. Air is utilized to operate valves and to purge sample taps.
Process Gas Sunniv The supply and return lines are constructed of schedule 40, monel pipe except for the schedule 40, low carbon, nickel pipe between the mixer and the degrader vessel.
Process gas containing coolant is piped to the Old Freon Degrader Facility through the supply line which is routed from purge cell 18 or 20 of the Top Purge Cascade. With completion of the "new" Freon degrader project, additional supply locations in Top Purge purge and isotopic cells will be added.
Mixer The mixer, a nominal 2 foot section of 3 inch, schedule 40, monel pipe, causes turbulence and mixing of the gases due to the abrupt changes in pipe diameter.
Degrader Vecsel and Shell The mixed gases flow from the mixer through I inch, schedule 40, low carbon, nickel pipe to the nominal 61/2-foot-long degrader vesse. which consists of a heating and a cooling section. The heating section is fabricated from 1/2-inch nickel side plates and 2-inch heater plates. The heater plates are bored for approximately thirty 675-wati cartridge heaters with nickel heat-transfer rods extending into the heater cavity which measures about 41/2 inches square by 3 feet long. The cooling section of the degrader vessel is fabricated from 5-inch, schedule 40 nickel pipe.
The heater section is raised to an initial temperature of approximately 800*F by the electric heaters, after the flow of the nitrogen diluent has been started. The flow of fluorine, and then of process gas / coolant supply, is initiated. The cascade operator varies the flow of process supply stream (coolant) and nitrogen diluent to adjust the temperature within the heater section to an operating temperature of 950*F to 1150*F.
Variations of coolant concentration in the supply stream tend to produce operating temperature changes. The operator periodically monitors and-maintains the temperature within the operating range by flow rate manipulations.
The degrader vessel, which is wrapped with high temprature insulation, is contained within a 3/8-inch-thick,36-inch diameter steel shell. The annulus formed by the shell and the vessel is pressurized with a 1-2 psig nitrogen buffer that is maintained by a pressure regulator. Should a break develop in the degrader vessel, dry nitrogen will flow into the system instead of wet air. The nitrogen flow and buffer pressure can be monitored and controlled locally, with a normal shell pressure light and a low shell pressure light at the local panel.
3.1-158
SAR-PORTS
,m January 15, 1999 V)
Rev.28 l
E11ms The product gases and possible solid particulates flow from the heating section through the cooling section, where natural heat transfer (conduction, convection, radiation) carries away heat energy, to one of two parallel filters with sintered metal filter elements, where any particulates are removed. Pressure drop across the filters can be monitored to give an indication of the extent of filter plugging. The filter containers are built with extra capacity so the filters can be backflushed to extend the onstream time between filter changeouts. A photo of the actual degrader vessel containment shell, the filter containers, and the connecting process piping are shown in Figure 3.1.5-6.
Process Gas Return I ines After passing through the filter, the product gases pass through an outlet flow control valve which throttles to maintain system pressure at a desired value. The product gases are then piped to the Top Purge Cascade. The return point is at a slightly lower pressure than the supply point; the pressure differential is the motivating force for flow through the degrader system.
Instrumentation and Controls Control of the gas flow rates to the degrader system is accomplished at the local control panel. The rates at which process gas / coolant, fluorine, and nitrogen enter the degrader system are ideally regulated to Q
achieve a molar ratio of approximately 1:5:12, respectively. The process supply with a variable coolant
(,/
concentration is regulated by a control valve through the use of a pressure-indicator-controller (PIC) on the local panel. The constant fluorine supply is maintained by a pair of block valves used to reduce the building supply header pressure and by the use of medium flow capillaries (he high and low flow capillaries have been removed). The building header is supplied from X-342-B fluorine storage drums whose outlet pressure is reduceti to 9.5 psig by a pressure-indicator-controller. The pressure drop associated with piping the fluorine I
from X-342-B to X-326 results in an X-326 building supply header pressure of 3.0 psig nominally. When the I
degrader is operating, the fluorine supply pressure is adjusted to approximately 0 psig which corresponds to a fluorine flow rate through the capillary of about 265 scfd. The nitrogen diluent supply flow is monitored and verified by a rotometer on the nitrogen feed panel and regulated by the use of one of three parallel capillaries. The fluorine and nitrogen capillaries are located on a capillary panel at the local control center.
Fluorine and nitrogen are introduced into the supply gas upstream of the mixer.
)
Pressure indications can be obtained for the fluorine, process gas / coolant, and nitrogen supplies; mixer inlet; degrader vessel inlet; degrader vessel outlet; degrader vessel shell; filters; and the return line if the fluorine pressure reaches 0.0 psig at the orifice just prior to entry into the capillary, an alarm is actuated in I
the ACR and the fluorine supply valve closes, if the degrader vessel pressure reaches 5 psia, an automatic j
system shutdown is initiated which includes process (coolant) and fluorine supply valve closures, heater power shutdown, an alarm light at the local panel, and an alarm light and horn in ACR-6.
The pressure drop across the onstream filter can be monitored to give an indication of the extent of filter plugging. As the filter plugs, the pressure drop increases, the operating capacity of the outlet control valve to regulate system pressure cannot be maintained, making combustion difficult to sustain.
.Q 3.1-159 v
SAR-PORTS January 15,1999 Rev. 28 ne nitrogen buffer flow and pressure is monitored so that a leak in the buffer system, which could be either into the degrader vessel or out to the atmosphere through the shell or flange, is indicated locally and in ACR-6. He cascade operator is able to determme the actual conditions by leak rating the degrader.
Thermocouples monitor temperatures of the degrader system. There are thermocouples on the mixer inlet line, mixer, degrader vessel inlet line, and the heating and cooling zones of the degrader vessel. These temperatures are recorded on a multiple point strip chart temperature recorder at the local panel. An additional set of thermocouples located on the outlet of the mixer and on the heating zone of the degrader are used to control the electrical heater circuit of the inlet piping heat tracing and degrader heaters, respectively.
An indicator light on the local panel and an indicator light / audible alarm on the ACR-6 panel actuate when any point monitored by the multiple point temperature recorder reaches 1150*F. The cascade operator may adjust the reactant flows or shut down the system depending on his judgment of the rate of temperature rise. When any point monitored by the temperature recorder reaches 1200*F, an automatic system shutdown is initiated. An automatic shutdown closes the process (coolant) and fluorine supply valves and opens the breakers for the electric heaters.
The mixer temperature is visually monitored on the temperature recorder and if the temperature exceeds 300"F, due to combustion in the mixer, nitrogen is manually valved through the mixer until it cools.
In case of an emergency, an emergency shutdown button in ACR-6 can be used to de-energize the heaters and close the coolant and fluorine supply valves.
3.1.5.3 Hazardous Materials The following materials are supplied to the Freon Degrader System during normal operation: fluorine, l-nitrogen, and process gas stream. The process gas stream is made up of mostly coolant, nitrogen and oxygen, with less than 10% UF., and small amounts of technetium and other heavy metal fluorides. Desired products of CF, and CIF, along with various partial coolant reaction products, are produced from the reaction of coolant and fluorine. The combustion products and unreacted gases flow through the filters and the return line back to the Top Purge Cascade. The filters trap out particulate matter (solid uranium compounds, technetium compounds, and other heavy metal fluoride compounds) that are dispersed throughout the degrader. The materials, quantities, forms, dispersibility, locations, and anticipated releases during normal operations are summarized in Table 3.1.5-1. Included in the table are two materials, HF and UO F, that may form in the 2
degrader system during a postulated leak of ambient air into the system. The maximum operating pressure of the system is below atmospheric, so any leak that develops in the supply line, the degrader vessel, filters, or return line, will result in a flow of ambient air or nitrogen into the system. A leak in the fluorine and nitrogen supply systems, which are at above-atmospheric pressure, could produce a hazardous condition in the enclosure of the Cell Floor Freon Degrader.
I 3.1-160
SAR-PORTS January 15.1999
(]
Rev.28 L/
3.1.5.4 Confinement System The process materials are confined within the mixer, degrader vessel, filters, and piping. The integrity of the component parts has been assured by selecting materials to withstand process temperatures and gases, by adherence to fabrication specifications and standards, and by leak testing of components following fabrication. After assembly, the Cell Floor Freon Degrader was leak tested following installation, prior to I
operation, in accordance with UCC-ND Techmcal Specification P-1.1, Subsection 13.7. Leak tests have been conducted at 50 psig, using nitrogen and a soap solution, followed by a vacuum test at.1 psia. The Operating i
Floor Freon Degrader was also leak tested and checked prior to initial operation.
l The two filters have flanged connections on the inlet and outlet lines, on isolation valves on both sides of each flange, and on fittings for nitrogen purge line connections.
The removal of a plugged or full filter is a normal maintenance function that could release small amounts of the contained particulates (technetium compounds and heavy metal fluorides). In the New Freon Degrader, these would probably be retained within the degrader enclosure. Before the flanges are carefully unbolted during a filter removal, the flange connections and the pipe volume between the associated valves will be purged with nitrogen and the contents evacuated downstream of the filter. Proper personal protection, as well as administrative controls which include operating and maintenance procedures and contamination monitoring by Radiation Protection, will prevent personnel exposure and the spread of contamination.
Removed filters will be sealed around the openings, lifted out of the enclosure by crane, and moved to the i
X-705 Decontamination Building for cleaning. The filter renoval procedure is covered in the operating (q
f
)
specification. Sealed surfaces of the enclosure interior will facilitate cleanup operations.
The fluorine and nitrogen supply lines have been fabricated from materials meeting the appropriate specifications. All pipe and components have been cleaned prior to installation to assure the absence of moisture, hydrocarbons, rust, etc. and have been purged following installation.
3.1.5.5 Ventilation System The Freon Degrader System Joes not have any independent ventilation system. The X-326 Process Building ventilation system provides adequate ventilation for the system on both the cell and operating floor.
3.1.5.6 Waste Disposal System in normal operation, gaseous combustion products of the Freon degradation are returned to the Top Purge Cascade. Particulates are trapped out in the filters. When the filter pressure drop exceeds.5 psi, the filter will probably be plugged and can be backflushed with nitrogen to restore its filtering capability. When l
backflushing is no longer effective or the filter is full, the filter will be isolated by valving operations, removed I
from the system, and cleaned at the X-705 Decontamination Building.
.O s 3.1-161
SAR-PORTS January 15,1999 Rev.28 3.1.5.7 Nuclear Criticality Safety Nuclear criticality safety for both the Cell Floor and Operating Floor Freon Degraders is based on I
geomemcally safe design for uranium of any isotopic composition. De degrader shells are equipped with a nitrogen buffer system that will prevent outleakage of process material into the shell annulus and inleakage of ambient air into the system through leaks in the degrader vessels. Because both degraders operate at below atmospheric pressure, no process material should escape from the system.
Criticality alarm clusters have been installed on the cell and operating floors of the X-326 Process Building.
3.1.5.8 Fire Protection The Freon Degraders contain a minimal amount of combustibles. Daily inspections of the area by operators ensure detection of any process lube oil system leaks in the cascade diffusion equipment. Both degraders are protected by the building fire sprinkler systems. (See Section 3.6.1.)
In order to preclude the entrance of process lubricating oil into the Cell Floor Freon Degrader I
enclosure from an external oil spill, the enclosure walls have been sealed to the floor and the doorway entrance has been protected with a 5/8-inch-high threshold, also sealed to the floor.
3.1.5.9 Support Systems ne support systems for both the Cell Floor and Operating Floor Freon Degraders are instrument air I
and electricity. The loss of air or electricity will automatically result in safe shutdown of the degrader system.
De fluorine and coolant supply flow control valves will close and the nitrogen flush valve will open. Valve position indications for the new degrader are displayed at the control panel in ACR-6.
3.1.6 Cascade Systems Safety Systems, Design Features, and Administrative Controls 3.1.6.1 Safety Systems he information contained in this section has been deleted. Safety systems are delineated in Chapter 4, Accident Analysis, of this SAR.
3.1.6.2 Design Features The information contained in this section has been deleted. Safety design features are delineated in Chapter 4 Accident Analysis, of this SAR.
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SAR-PORTS -
January 15,1999
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DEGRADER CONTROL PANEL NITROGEN FEED PANEL Figure 3.1.5-4 Operating Moor Freon Degrader M Control Panel - Sheet i V-3.1-347
\\
SAR-PORTS January 15,1999 Rev.28 COMPONENT DESCRIPTION NUMBER DESCRIPTION i
1 V Nitrogen Purge Block Valve to Mixer Inlet 2
V Mixer Inlet Pressure Output Control Valve PBM 3
V Reactor Outlet Pressure Output Control. Valve PBM 4
V Reactor Inlet Pressure Output Control Valve PBM 5
V Reactor Inlet Pressure to PI and Sample Connection 6
V Reactor Outlet Pressure to PI and Sample Connection 7
V Nitrogen Purge Block Valve 8
Fluorine Flow Meter 9
PI (Not currently being used) 10 PIC for Output CV 11 Reactor Input Pressure 12 Sample Connection 13 Com mund PI 14 PIC Por Input CV 15 Heater "ON - OFF" Buttons 16 Reactor "High Temperature / Pressure" Alarm Light 17 Reactor Heater Reset 18 Mixer Normal Temperature Light 19 Reactor Low Temperature Light 20 Normal Shell Pressure Light 21 Low Fluorine / Buffer ' essure Light 22 Speedomax Temperature Recorder 23 TV+ Temperature Controller 24 PI (Reactor Shell Pressure)-
25 2000 scfd Nitrogen Orifice 26 PI (Fluorine Pressure) 27 Valve (V-1, 2000 scfd Nitrogen Orifice Shutoff) 28 Valve (V-2, 2000 scfd Nitrogen Orifice Block) 29 Valve (V-3, 689 scfd Nitrogen Orifice Shutoff) 30 689 scfd Nitrogen Orifice 31 Valve (V-4, 689 scfd Nitrogen Orifice Block) 32 Valve (V-5,147 scfd Nitrogen Orifice Shutoff) 33 147 scfd Nitrogen Orifice 34 Valve (V-6,147 scfd Nitrogen Orifice Block) 35 Nalve (V-7, Nitrogen Needle Valve Shutoff) 36 Nitrogen Needle Valve 37 Valve (V-12, Fluorine Block) 38 Valve (V-ll, Fluorine Block) 39 265 scfd Fluorine Orifice 40 Valve (V '10, Fluorine Orifice Shutoff) 41 Valve Valve ((V-9, Fluorine Orifice Shutoff) 42 V-20, Nitrogen Purge Block) 43 Valve (V-29, Nitrogen Purge Block) 44 Valve (V-31, Nitrogen Orifice Panel Block) 45 Valve (V-33, Fluonne Purge Block) 46 Valve (V-34, Fluorine Purge Block) 47 Valve (V-28, Nitrogen Purge Shutoff Block) 48 Valve (V-30, Nitrogen Orifice Panel Shutoff) 49 Valve (V-32, Fluorme Purge Shutoff)
Figure 3.1.5-4 Operating Floor Freon Degrader Local Control Panel - Sheet 2 1
3.1-348
i l
SAR-PORTS Jag 15,1999 I
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January 15,1999 SAR-PORTS Rev.28 I
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r ' M < <d Figure 3.1.5 4 Operating Floor Freon Degrader Containment Shell, Filter Containers, and Connecting Piping 3.1-350
i SAR-PORTS -
January 15. 1999 j
Rev.28 i
ir.
'(
[
LIST OF FIGURES l
Chapter 3 (Continued)
EigKt fase L 3.1.1.10-3
' Valving Control Board....................................
3.1-279 L
~ 3.1.1.10 4 PCF Floor Plan.........................................
3.1-280 3.1.1.10-5
' Interior of the PCF....................................... 3.1-281 3.1.1.11 CADP Systems Monitors..................................
3.1-282
- 3.1.1.11 Locations of X 333 Outieakage Detector Heads...................
3.1-283 3.1.1.11-3 Locations of X-330 Outleakage Detector Heads...................
3.1284 3.1.1.11-4:
Typical Outleakage Detection Monitor Mimic Panel................
3.1-285 -
_3.1.1.11 5 Unit Interface Cabinet................ '..................... 3.1-286 3.1.21
. Location of the Purge Cascade in the X-326 Process Building........... 3.1-287 3.1.2-2:
Top and Side Purge Cascades and Auxiliary Systems...............
3.1-288 3.1.2-3a '
Purge Cascade and Bypass Piping............................ 3.1-289 3.1.2-3b ~
Purge Cascade and Bypass Plping...........................
3.1-289b l-3.1.2 Typical Purge Cascade Cell................................
3.1-291 3.1.2-5 Purge Cascades Booster and Orifice Stations.....................
3.1-292 T 3.1.2-6a Top Purge Booster Station Concentration Recycle and Orifice Station Instrumentation........................................
3.1-293 3.1.2-6b Top Purge Rooster Station Concentration Recycle and Orifice Station 2
Instrumentation........................................
3.1-295
/p 1
Side Purge Booster Station Concentration Recycle and Orifice Station 3.1.2-7 Instrumentation........................................
3.1 -297
{
.3.1.2-8' Purge Cascade Configuration '...............................
3.1-298 i
3.1.2-9 P.G. Freezeout Conditions.................................
3.1-299 3.1.2-10 Top Purge Booster Stations................................
3.1 -300 l
3.1.2-11
' Side Purge Metering Station................................. 3.1-301 3.1.2-12 Chemical Trap Station....................................
3.1-302 L 3.1.2-14.
Typical Cell Cubicle ^.....................................
3.1 303 3.1.2-16
- PCF Controls for the Purge Cascade..........................
3.1-304 3.1.2-17 Typical Purge Cascade Gradients............................
3.1-305 3.1.2 18 5-Inch Can Storage Area for Waste Material.....................
3.1-306 3.1.31 Locations of Freezer / Sublimer Systems in the X-333 Process Building....
3.1307 3.1.32 Freezer / Sublimer Safety and Control Systems....................
3.1-309 3.1.3-3 Operating Conditions for UF. Freezer Mode.....................
3.1-311
-3.1.3-4 Operating Conditions for UF. Sublime Mode.....................
3.1-312 3.1.35-Operating Conditions for UF. Cold Standby Mode.................
3.1-313 3.1.3 6 Operating Conditions for UF. Hot Standby Mode.................
3.1-314 3.1.3-7_
Operating Conditions for UF. Modified Hot Standby Mode...........
3.1-315
=3.1.3 Operating Conditions for Cold Trapping UF From UF.-Freon Mixtures..
3.1-316
'3.1.4 X-330 Cold Recovery Diagram.............................. 3.1-317 3.1.4-2.-
X-333 Cold Recovery Diagram.............................. 3.1-319 3.1.4-3 CIF Phase Diagram 3.1-321 3
qh xi
l SAR-PORTS January 15. 1999 Rev.28 LIST OF FIGURES Chapter 3 (Continued) 1 Figure Eage 1
3.1.4-4 Simplified Cold Trap Control Diagram......................... 3.1-322 3.1.4-5 Space Recorder Constants for Lower Assays.....................
3.1-323 3.1.4-6 Allowable Vent Stream Concentrations.........................
3.1-324 3.1.4-7 Regeneration Panel......................................
3.1-325 3.1.4-8 X-330 Cold Recovery Area.................................
3.1-326 4
3.1.4-9 X-333 Cold Recovery Area.................................
3.1-327 l
3.1.4-10 Typical 5-Inch Cold Trap..................................
3.1-328 3.1.4-11 X-330 Cold Trap Design and Instrumentation....................
3.1-329 3.1.4 12 Instrumentation Panel for Storage Drums and Cold Traps...........
3.1-330 3.1.4-13 S urge Drums..........................................
3.1 -331 3.1.4-14 Holding Drum Valve Manifold..............................
3.1-332 3.1.4-15 X-330 Chemical Trap Room................................
3.1-333 3.1.4-16 X-330 Surge Drum Room..................................
3.1-334 3.1.4-17 Typical Refrigeration Unit.................................
3.1-335 3.1.4-18 X-330 CIF Storage Pig....................................
3.1-336 3
3.1.4-19 X-330 Space Recorder Flow and Control Instrumentation Diagram.....
3.1337 3.1.4-20 CIF Flow Control to the Space Recorder.......................
3.1-338 3
3.1.4-21 Typical Cold Trap Heater Control Schematic for X-330 Cold Trap "A"...
3.1-339 3.1.4-22 Pressure-Temperature Diagram of Process Gas...................
3.1-341 3.1.5-1 New Freon Degrader Piping Layout...........................
3.1-342 3.1.5-2 1sometric View of the New Freon Degrader and Housing.............
3.1-343 3.1.5-3 New Freon Degrader Flow and Instrument Diagram...............
3.1 -345 3.1.5-4 Operating Floor Freon Degrader Local Control Panel - Sheet 1........
3.1-347 3.1.5-4 Operating Floor Freon Degrader Local Control Panel - Sheet 2........
3.1-348 3.1.5-5 Operating Floor Freon Degrader Flow and Instrument Diagram....... 3.1-349 3.1.5-6 Operating Floor Freon Degrader Containment Shell, Filter Containers and Connecting Piping.......................................
3.1 -350 3.2-1 Locations of UF. Feed, Withdrawal, Sampling, Handling and Cylinder S t orage............................................... 3.2-84 3.2-2 Basic UF. Cylinder Flow Scheme.............................. 3.2-85 3.2-3 Feed / Sampling Autoclave Piping (Typical for One Autoclave).......... 3.2-86 3.2-4 X-343 Autoclave......................................... 3.2-87 3.2-5 Diagram of a Typical Feed and Sample Autoclave.................. 3.2-88 3.2-6 Diagram of a Typical Feed Autoclave........................... 3.2-89 3.2-7 Drawings of Typical Cranes................................. 3.2-90 3.2-8 Diagram of a Typical Sample and Transfer Autoclave............... 3.2-91 3.2-9 X-29-4 Side Feed Station................................... 3.2-92 3.2-10 ERP and LAW Flow Diagram................................ 3.2-93 3.2-11 Tails Withdrawal Flow Diagram.............................. 3.2-94 9
xii
e, nim e
SAR-PORTS ~
January 15, 1999 p
Rev.28 i
V hours. For many years, 8 mole percent has been regarded as the maximum fluorinating agent concentration that should be allowed to occur in cascade amipment As a result of these tests, the design has evolved such that the four fluorine capillaries supplying fluorine to the Cell Floor Freon Degrader have been calibrated to ensure a combined flow rate of.1400 scfd at design pressure. The one fluorine capillary supplying fluorine to the Operating Floor Freon i
Degrader also satisfies this design requirement.
Recent studies have shown that 8 mole percent is the limiting tiuorinating agent concentration for mixtures at atmospheric pressure. The limiting concentration at conditions in the Top Purge Cascade is considerably greater.
At maximum operating pressure in the Top Purge Cascade, the limiting concentration is calculated at 16 mole percent.
4.1.5.3 Release of Toxic Material Scenarios were developed where excessive amounts of fluorine pass through the degrader system and accumulate i
'in the Top Purge Cascade in concentrations approaching 16 mole percent. The 16 mole percent will include the fluorine component from normal cascade operations. Consequently, a controlled amount is allowed to te introduced from the Freon degrader.
An oversupply of fluorine could be introduced to the Freon degrader systems by installing oversize capillaries supplying the system, or increasing the fluorine supply header pressure to drum pressure (45 psig).
l Each of these possibilities were investigated and it has been determined that the many equipment failures and
_g
' [W]
operator errors would have to be committed for the explosion to occur.
j
' Besides installing oversize capillaries, additional failures and errors would have to be committed including: high flow alarm failure, full fluorine flow would have to pass unreacted through the degrader to the Top Purge Cascade, low temperature alarm would have to fail, maximum concentration of fluorine exceeded, and an ignition source present.
To introduce an overpressure of 45 psig fluorine into the degrader system: (1) the pressure controller at the j
X-342-B storage facility would have to fail; (2) the high fluorine pressure alarm for the Cell Floor Freon Degrader would have to fail or be ignored by operators; (3) the low temperature alarm would have to fail or be ignored; (4) the fluorine high pressure shutdown for the Operating Floor Freon Degrader or the high high pressure shutdown for the Cell Floor Freon Degrader would have to fail; (5) and the fluorine would have to pass unreacted through the system to the Top Purge Cascade.
l In conclusion, if an explosion did occur, no significant amount of taxic material would be released, although the cell did rupture, because there is less than one pound of UF. in the attached cell.
The only possible safety hazards with the Freon degrader systems are explosion and fire and these possibilities are reduced to extremely low with no UF. source terms.
A
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SAR-PORTS January 15,1999 Rev.28 O,
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- 4. I - 68d
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_ _ - _. _ _ _ _ _ - _ ~.. _ _ _. _ _. _ _ _ _.
TSR-PORTS January 15,1999 j
Rev.28 SECTION 2.7 SPECIFIC TSRs FOR X-326 CASCADE FACILITY O'
2.7.3 LIMITING CONTROL SETTINGS, LIMITING CONDITIONS FOR j
OPERATION, SURVEILLANCES 2.7.3.9 Freon Degrader Fluorine Flow' APPLICABILITY:. X-326 c=M Operational Mode II (i.e., F and coolant flow into reactor) 2 LCO:
Fluorine addition to Freon Degrader shall be s 400 scfd.
SURVEHLANCE REOUIRFMENTS:
p i
Frequency Surveillance Annualiy SR 2.7.3.9.1 Calibrate four Cell Floor Freon Degrader F2 supply capillaries to 25, 50,100, 200 scfd, respectively, at 5.0 psig fore pressure l
Annually SR 2.7.3.9.2 Calibrate one Operating Floor Freon Degrader l
F, supply capillary to 265 scfd at 0 psig fore pressure r
Annually SR 2.7.3.9.3 Perform functional test of the Cell Floor l
Freon Degrader to verify that F high high pressure will 2
L shutoff F, supply to the Freon Degrader Semiannually SR 2.7.3.9.4 Calibrate the Cell Floor Freon Degrader high high pressure F trip at s 5.0 psig 2
l Annually -
SR 2.7.3.9.5 Perform functional test of the Operating Floor Freon Degrader to verify that F high pressure will shutoff 2
F supply to the Freon Degrader 2
o j_
Semiannually SR 2.7.3.9.6 Calibrate the Operating Floor Freon Degrader high pressure F, trip at.10 psig l
. BASIS:.
Oxidant concentration can build up in the Top Purge and therefore could form a highly exothermic jz reacting mixture that in the presence of an ignition source will react and has the potential to create l,
an overpressure situation that may result in breaching the process system and the release of process L
gas to the environment. Previous studies have determined that an the highly exothermic reaction L
is not achieved until the oxidant concentration exceeds 19 moleL The addition of 400 scfd imreacted F on the cascade would not exceed the assumptions made in 2
p the administrative model for ensuring safe oxidant concentrations in the Purge Cascade [SAR l.
4.1.5.2 & 4.1.5.3].
!O 2.7-15
-.