ML20214W798
| ML20214W798 | |
| Person / Time | |
|---|---|
| Site: | Framatome ANP Richland |
| Issue date: | 09/30/1986 |
| From: | SIEMENS POWER CORP. (FORMERLY SIEMENS NUCLEAR POWER |
| To: | |
| Shared Package | |
| ML20214W758 | List: |
| References | |
| 28230, NUDOCS 8706160189 | |
| Download: ML20214W798 (7) | |
Text
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., - i, ADVANCEDNUCLEARFUELSCORPORATION XN~2 SPECIAL NUCLEAR MATERIAL LICENSE NO. SNM-1227, NRC DOCKET NO. 70-1257 PART 11 - SAFETY DEMONSTRATION REV.
Sweco unit and will then be treated in the same manner as the sand fraction discussed above. The >3/8 inch material will be washed with water in a small cement mixer in order to remove the sand and slimes. The large solids will be discarded. The water washes will be processed through the Sweco unit.
Af ter the economic uranium values have been removed from the slimes and fines, the solids will be filtered, combined with drying and solidifying agents, and packaged for disposal. At this time, it is anticipated the system, which will be used for disposal of Solid Waste Uranium Recovery (SSNUR) ash, can also be used for disposal of these solids.
10.4.5 Solid Waste Uranium Recovery Facility Description The SWUR facility has been designed to incinerate uranium contami-noted, combustible solid waste for volume reduction and uranium recovery.
The incinerator and auxiliary systems are located in Room 173 of the Specialty Fuels Building (see Section 10. l.1 ).
The process is divided into five systems: Feed preparation, incineration, of f-gas cleaning, and ash handling and ash leaching.
10.4.5.1 Feed Preparation Solid wastes, generated in the nuclear fuel fabrication facilities, are sorted into combustible and noncombustible waste fractions. The noncombusti-ble wastes are surveyed item-by-item for uranium content and are packaged for disposal at a licensed nuclear burial ground. The combustible wastes are packaged in 55-gallon plastic-lined metal drums for storage, or in plastic-lined cardboard boxes for feed to the incinerator. The combustible waste packages are weighed and assayed for uranium content prior to storage or incineration.
The incinerator feed packages are conveyed to the incinerator hydraulic ram feeder, which is automatically controlled to feed the incinerator primary chcmber through a hydraulic guillotine door.
The ram feeder has a sealed loading hopper and can handle up to one cubic yard feed batches.
The guillotine door and ram feeder are interlocked to prevent simultaneous opening of both doors and the feed hopper and ram face are automatically inerted using a nitrogen fire suppression system if a fire is detected by a flame scanner located in the feed hopper.
I 10.4.5.2 Incineration The safe batch controlled incinerator has a nominal capacity of 200 lb/hr of uranium contaminated combustibles waste consisting of paper, plastics, wood, etc.
The incinerator is a commercial controlled air unit modified to minimize ash holdup and to facilitate good carbon burnout and system cleanout.
The unit consists of primary and secondary chambers, each AMENDMENT APPLICATION DATE:
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'i ADVANCEDNUCLEARFUELS CORPORATION XN-2 SPECIAL NUCLEAR MATERIAL LICENSE NO. SNM-1227, NRC DOCKET NO. 70-1257 PART 11 - SAFETY DEMONSTRATION REV.
constructed of a carbon steel shell, internally coated with a mastic material for acid gas corrosion protection, and lined with both insulating and high density castable refractory selected to minirnize permeation of uranium contamination and to provide good service life.
Both chambers have propone-fueled burners and combustion air ports. The primary chamber is operated at 1600-18000F and the combustion airflow is controlled to near stoichiometric requirements to promote quiescent burning with minimal particulate entrainment. Combustion products and pyrolysotes are possed to the secondary chamber where excess air and high temperature (approximately 20000F) and a minimum two second residence time combine to completely burn all combustible gases including dioxins which may form from PCV incineration. Alarms and interlocks are provided to prevent feeding the incinerator if either the primary or secondary chamber temperatures are too low or high, there is low combustion air pressure or a high pressure occurs in the primary chamber. Extremely high chamber temperatures automatically-shutdown the incinerator. Alarmed interlocks are also provided to shutdown the incinerator if the propone burners malfunction, high liquid level occurs in the quench column, low liquid level occurs in the packed column scrubber or low HEPA filter differential pressure occurs.
10.4.5.3 Off-Gas Treatment System The incinerator exhaust gas from the of ferburner chamber contains particulates, vapors and gases (including acid gases) which result from the combustion of cellulose, rubber, and plastics present in the waste feed.
Cooling of the gases and removal of the acid gases and potentially radioactive particles is accomplished by components which consists of a quench column, a high energy venturi scrubber, o pocked column, a mist eliminator, a reheater, and a HEPA filtration module.
The quench column is divided into an upper contacting section and a lower sump section. In the contacting section, cooling and saturation of the incinerator exhaust gas occurs simultaneously by the evaporation of scrub
. solution liquid.
Excess solution collects in the 10-inch diameter sump section while the saturated gas is routed to the inlet of the venturi scrubber. An automatic emergency quench system is provided to supply process water to the quench column if a high column outlet temperature or loss of normal power occurs.
The variable throat, high energy venturi scrubber located between the quench column and the packed column removes more than 99 wt% of the of f-gas particulates.
Scrub solution is injected through a nozzle located upstream of the throat. An alarmed interlock is provided to prevent feeding the incinerator if the scrub solution flow is low.
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The packed column is designed to slightly cool the.off-gas and to remove the acid gases from the gas phase by countercurrent contact with recycled scrub solution.
The gas discharges from the pocked column through a polypropylene mist eliminator. Alarmed interlocks are provided to prevent feeding of the incinerator if a high packed column inlet temperature or a low scrub solution pH occurs.
The gas enters the electric reheater where it is warmed to a minimum of 150C above the saturation temperature. This reduces the relative humidity of the gas to prevent wetting of HEPA filters. The reheater is controlled by on SCR controller which maintains the proper temperature difference from the reheater inlet to the filter outlef.
Alarms and interlocks are provided to prevent feeding of the incinerator if a high heater differential temperature or high filter inlet temperature occurs.
The off-gas module contains the prefilter and two banks of HEPA filters.
The stainless steel module housing is designed and reinforced to withstand the 150 inch H O vacuum to which it may be exposed. DOP/ DOS testing of the 2
final HEPA filter bank can be accomplished.
Particulates that have been scrubbed from the gas stream are removed from the scrub solution by the filters.
The filter elements are made from combustible materials so that once they are expended, they con be burned in the incinerator.
Minimum expected replacement period between element changeout is eight hours.
The scrub solution liquid is circulated by redundant pumps to insure a continuous stream of scrub solution liquid.
Automatic switchover of pumps occurs upon on-line pump failure.
Scrub solution liquid is cooled by a plate-type heat exchanger. Cooled liquid is used to improve acid gas absorption and to reduce the packed column discharge gas temperature.
An alarmed interlock is provided to prevent feeding the incinerator if a high cooler outlet temperature occurs.
Caustic
. addition to the system is automatically controlled by the pH controller in the packed column scrub solution liquid line.
Scrub solution Nacl concentration is maintained at 6 percent in order to prevent corrosion of metal components. Other major chemical constituents of the scrub solution liquid will be Na2CO3 (from CO2 absorption), Na2SO4 (from SO2 neutralization), NaOH (caustic addition), and small amounts of NaF and NANO 3 (from chemicals in the feed). A total dissolved solids analyzer, which basically works on solution conductivity, is provided to control the blowdown stream.
The blowdown stream is proportionally sampled and discharged to lagoon SA (see Section 10.4.1).
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10.4.5.4 Ash Handling Ash formed from the combustion of wastes is pushed along the hearth by incoming feed and by an internal ash plow. The ash is pushed through an ash gate into an ash pit located at the end of the hearth. The ash is cooled in on isolation chamber that discharges periodically into o drum.
The drummed ash is transported to on ash screening and milling area where oversize and/or metallic klinkers are separated. The oversize material is milled and combined with the ash in the drum. The drum is assayed for uranium content and stored and/or transported to the UO2 Building ash dissolution-packaging area. Drums of ash, low in uranium content, are not leached.
10.4.5.5 incinerator Ash Leaching Combustion ash is leached with a sodium carbonate-sodium, bicarbonate-sodium hypochlorite solution at elevated temperature in an agitated vessel that is operated on a batch basis for criticality control.
The teaching solution and solids are separated by a rotary drum filter.
Following separation, the solids are mixed with drying and solidifying agents and loaded into containers for disposal. The teaching solution is treated with an acid at an elevated temperature and air sporged to destroy carbonates.
After destruction of the carbonates, the solution is routed to the miscellane-ous uranium recovery system for precipitation and recovery of the uranium.
10.5 Fire Protection 10.5.1 Building Codes and Standards All permanent buildings at the fuel fabrication plant were constructed in accordance with the applicable sections of the following building codes and standards.
Uniform Building Code (Seismic Zone 2)
Uniform Plumbing Code Uniform Mechanical Code Uniform Fire Code National Fire Codes (NFPA)
National Electrical Code ANSI-Cl ASHRAE Standards Chapter 296-44 Washington Administrative Code Chapter 296-24 Washington Administrative Code Richland Municipal Code and Zoning Regulations Richland Municipal Ordinances Number:
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3777 (adopt. Building Code) 3877 (adopt. Plumbing Code) 3977 (adopt. Mechanical Code) 10.5.2 Fire Protection Liability Inspections Exxon Nuclear Company, Inc. has elected to self-insure with regard to property damage. Exxon Corporate Headquarters schedules a fire protection audit of its affiliate subsidiaries approximately every three years by an aci<nowledged fire protection consultant. The City of Richland's Department of Fire and Emergency Services conducts annual fire protection inspections of Exxon Nuclear's fuel fabrication plant facilities.
The most recent copies of these audits and inspections, along with Exxon Nuclear's reply, are appended. (See Appendix A.)
10.5.3 Fire Protection Program 10.5.3.1 Combustible Solid Waste Handling and Storage Outside metal waste containers are provided by the City of Richland for clean wastes.
Contaminated combustible wastes are properly sorted into metal boxes or drums, sealed and stored on an outside pad for future uranium recovery or disposal per approved procedures.
Additional contaminated combustible wastes are stored in a fire-resistant metal building near the waste barrel / box storage pad. Combustible wastes generated inside the process and other buildings (either clean or contaminated) are collected in metal waste containers and emptied daily into the appropriate waste storage containers.
10.5.3.2 Flammable Liquid Storage Flamma' ale liquids are stored in approved safety containers or cabinets near the final use location.
Additional storage for flammable liquids is provided for in a fire-resistant metal warehouse located away from any
. radioactive material storage area.
10.5.3.3 Combustible Liquid Storage Combustible liquids are stored in approved metal containers near the final use location. Additional storage for combustible liquids is provided for on on outside storage pad.
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September 1986 10-48 XN4dF-FO1422 (2/87)
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10.5.3.4 Fire Prevention The manifolds for supplying combustible gases to the facility, including backup hydrogen for the sintering furnaces, are located outside the main building structure.
All combustible gas distribution piping meets applicable NFPA codes.
Combustible gas burn-of f devices and combustible gas detection equip-ment are used where necessary to prevent explosion and fires around sintering furnaces and ovens.
The HEPA exhaust filters in the UO2 and SF Buildings are protected from high temperatures and burning debris in the event of fire by automatic deluge systems in the exhaust plenums immediately upstream of the final filter bank.
10.5.3.5 Fire Detection and Alarm Rate-of-rise / fixed temperature heat detectors are used in the facility to detect fires. This fire alarm equipment is installed to provide automatic, as well as manual, alarm signals in event of a fire. The system includes an annunciator in the Central Guard Station which indicates which zone in the system has actuated.
(See Figure 11-10.32.) A signal is also automatically transmitted to the Richland Fire Department. The fire alarm is a multiple-strike gong (two strokes per second). The fire alarm system is inspected and tested in accordance with the applicable preventive maintenance procedures.
10.5.3.6 Fire Defenses The Exxon Nuclear facilities are located within the city limits of Richland, and thus are served by the Richland Fire Department.
The Washington Surveying and Rating Bureau has graded the City as Class 3 in its last survey. The closest City of Richland fire station is located at McMurray and Jadwin, about five road miles from the plant.
The Fire Department estimates running time to the plant to be about six minutes.
The City has mutual assistance agreements with surrounding communities, counties, and the DOE (which has a fire station at the Hanford i
300 Area located two miles northeast of the plant site).
The DOE fire-fighting staff is well trained in nuclear fire safety precautions and has available equipment for radioactive fire fighting. The Richland Fire Depart-ment receives annual training in radiological safety precautions from Exxon Nuclear personnel.
The plant site is fed water from the north city water grid through 10-inch diameter water pipes which enter the plant site from the north and south.
The plant loop to the hydrants is 8-inch diameter pipe. There are AMENDMENT APPLICATION DATE:
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eleven fire hydrants on plant site (see Figure' 11-10.18). There are Multi-purpose ABC, Halon, Met-L-x, CO, BC Dry Chemical, Purple-K Dry 2
Chemical, and AFFF fire extinguishers provided throughout the facility at selected locations.
These fire extinguishers are inspected and tested in accordance with the applicable preventive maintenance procedure.
The Exxon Nuclear Plant Emergency Response Teams receive annual training in first aid (or incipient) fire-fighting techniques. The Richland Fire Department has the main responsibility for fighting fires on the plant site.
10.5.3.7 Responsibilities The Manager, Safety and Security Operations, has the responsibility for inspecting and testing the plant fire extinguishers.
The Manager, Plant Maintenance, has the responsibility for inspecting and testing the plant fire alarm system.
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September 1986 10-50 XNWF-FO1422 (2/87)
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