Retention basin

Shielding. The roof over the basin is concrete with several feet of earth covering. This reduces radiation directly over it to less than a tolerance value of 50 mr/hr. 

Effluent Flows. The water flows that the retention basin is required to accommodate are summarized in Table 10.4.A. The normal operating flows are those listed under Continuous Flows, while the Intermittent Flows, constitute the flows encountered during periodic reactor operations and during 

Noraal sump overflow in water-cooling building  

Ventilation. The operating level of water in the retention basin is fixed at roof level by the overflow weir. Thus there is essentially no air over the water. This design eliminates the accumulation of radioactive argon, and/or an explosive mixture of hydrogen and oxygen. The basin effluent inlet must be ventilated to remove any activity. This is done by means of windv induced turret vanes on 20-ft high stacks. 

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Withdrawal towers in dams allow corrections to the altered thermal regime without much additional effort. Especially in clear water reservoirs, withdrawal towers allow managers to choose water at its natural temperature and to reduce artificial seasonal temperature shifts. Again, retention basins have the same... 

The assumed source of fecal coliform contamination is a wastewater treatment plant located 400 m upstream of the well field. Primary-treated wastewater is collected in a basin during rain storms, the retention basin sometimes overflows and the treated wastewater flows into Terrieu Creek. Previous research by Malard et al. (1994) at this... 

This provides personnel radiation protection and permits isolation and repair. To prevent leakage of radioactive water from around the shafts, demineralized water under pressure can be added at the shaft seal. However, allowing the active water to leak into drainage to the retention basin is not serious. 

There is a plugged drain opening in each cell. The drains are provided for use during washdowns of any con tamina ted. equi pmen t wi thin th e ce 11 s. These drains along with the one in the main exi,t duct, drain, to a sump beneath the building floor. The waste is pumped from the sump to the retention basin.. 

The Process Water Building and working reservoir are located east and slightly north of the Reactor Building. This-location effects a reasonably close approach both to the reactor and the water supplies located in the limited area. -Effluent control,- the retention basin, and the effluent pond are in the southeast corner of the site because of the direction of the undersurface water flows. 

STEAM PLANT FAN house < stack PLUG storage RETENTION BASIN EFFLUENT CONTROL SERVICES BLDG. 

The 50-gpm purge from the process-water system is sent direct to the retention basin for a holdup period of about 90 hr. This holdup time reduces the activity, which is due primarily to Na, from 1200 dis/ml/sec to about 20 dis/ml/sec. The discharge from the retention basin flows to the effluent. pond, where it percolates into the earth. 

Emergency. In the event of a fission break or high radioactive contamination in the cycling 320,000-gal process-water system, the entire contents of the system can be emptied into the retention basin for decay and holdup until disposal action can be taken. The 130,000-gal contents of the canal can be handled simi/larly if so desired. 

Each holdup tank is constructed on a concrete pad that drains to a dry well so that monitoring for leaks is possible. Each pair of tanks is supplied with One self-priming 50-gpm pump located above it so that leakage from the pump drains back to the tanks. The pump and tank piping is. such chat (1) the tank can be stirred. by recirculation, (2) a sample can be taken, or (3) the contents can be delivered to the retention basin, the effluent pond, dr the 10,000-gal permanent-storage tanks. The tanks in each pair have overflow lines to each other. Each tank is provided with a level gauge and a high-level alarm. 

Canal. The water in the canal may become contaminated with minute radioactive particles from the fuel and beryllium assemblies that are handled and stored in the.canal, and possibly from fission products in the event of a fuel assembly rupture When this water is not contaminated it is pumped to the cooling tower make up water. If the water becomes contaminated it is directed to either the sewer or the retention basin, depending on the amdunt of activity. These measurements are also made with the annular type ionization chamber. 

Retentzon Basin. The radiation emitted by the radioactive water in the retention basin is measured by placing G.E. air-wall type chambers above-the inlet and outlet troughs... 

Retention Basin, Plan and Section Effluent, Control, Plan and Sections Water Retention System - Flow Diagram Effluent Control Flow Diagram... 

Flood proofing to reduce or prevent loss to structures is highly recommended. Residential development densities should be relatively low development in obvious drainage channels should be prohibited. Dry stream channels should be maintained in a natural state and/or the density of native vegetation should be increased to facilitate superior water drainage retention and infiltration capabilities. Installation of upstream stormwater retention basins to reduce peak water discharges. Construction should be at the highest local elevation site where possible... 

Construction of retention basins at key points in the combined sewer system to accommodate first flush of storm (storage for later treatment). Three projects ... 

Punqied from Building lOd-K (a retention basin that receives contaminated water from the Building lOS-K heat exchwger bay sumps, motor room sumps, and pump room sun s)... 

Pumped from the Building 109-K (a retention basin that rktives water purged from the shield water system)... 

Answer It Is held up In the retention basin to allow the decay of short-lived radioactive products before It Is returned to the river. 

Downcomer - A large conduit (or pipe) at the rear of the reactor through which the outlet water flows downward and. on toward the retention basins. 

Storm sewers stormwater retention basins Undergronnd storage... 

Sa annah River Site, F -Area Retention Basin. South Carolina... 

Lockwood, G.J., R.A. Normann, and C.V. Williams. 1997. A final report of the environmental measurement-while-drilling-gamma ray spectrometer system technology demonstration at the Savannah River Site F area retention basin. Sandia Natl. Lab. Rep. SAND97-2028 UC-600. 

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