Radioactive Waste Drain System

Further details of the radiation monitoring system are provided in Section 11.5.2 of Reference 6.1. 6.5.18 Radioactive Waste Drain System... 

The radioactive waste drain system collects radioactive liquid wastes from equipment and floor drainage of the radioactive portions of the auxiliary building, aimex building, and radwaste building and directs these wastes to a centrally located sump located in the auxiliary building. The contents of the siunp are piunped to the liquid radwaste system tanks. 

The following design requirement for the radioactive waste drain system supports safe operation of the plant under normal eonditions ... 

The radioactive waste drain system must collect the radioactive liquid wastes from equipment and floor drains during normal operation, start-up, shutdown and refuelling, and transfer the liquid wastes to the appropriate proeessing and disposal systems. 

The radioactive waste drain system transfers collected waste to the liquid radioactive waste system. The contents of the sump are pumped to the liquid radioactive waste system tanks. Drainage lines from the negative pressure boundary areas of the auxiliary, radwaste, and armex... 

N-1 1301-N Liquid radioactive waste disposal system for N Reactor. Effluents from reactor coolant system, spent fuel storage basin, periphery coolant systems, and various radioactiv e drain systems in the reactor facility. Also disposal area for various laboratory chemicals. Historical average high flow rate of 2.100 gal/min. Crib and trench. 

The radioactive waste management systems are engineered to provide primary containment for mobile waste (i.e., tanks and pipework) and secondary containment (i.e. sloping floors, floor drains and sumps, etc.). 

In addition to their direct storage and use, many of the above listed substances could also be present in non-radioactive liquid waste. A non-radioactive waste water system collects and processes liquid waste from drains and sumps (in the turbine, auxiliary, diesel generator, and annex buildings). Waste water is monitored for radioactivity, and if radioactivity is detected, it is... 

The liquid radioactive, hazardous, or mixed wastes generated in the HCF during isotope processing that are not solidified are disposed of through the appropriate group within SNL s ES H Center. The liquid waste collected by the drain system is disposed of via a sanitary system managed by representatives of the ES H Center responsible for liquid effluents. 

Volume reduction of concentrated evaporator bottoms, which may include boric acid wastes, laundry wastes, chemical wastes, and other floor drain wastes, is accomplished in the radwaste volume reduction system. The major components of the system are the crystallizer chamber and recirculation system, condenser, and vacuum pump system. The crystallizer chamber consists of a conical tank and an inner circular baffle to separate solid crystals from a clear recycle stream. Combustible wastes such as clothing, filter cartridges, and wood are volume-reduced in the radwaste incinerator. Solidification of volume-reduced wastes and other low-level radioactive wastes, such as spent resins and contaminated tools, is performed in the cement solidification system. The major components of the cement solidification system include the high shear radwaste mixer, waste dispensing system, flush water recycle steam, cement storage and feed system, and the container handling system. 

The reactor coolant drain tank in the liquid radioactive waste system. 

Containment isolation valves are provided on either side of containment penetrations. The hquid radioactive waste system has two eontainment penetrations the reactor coolant drain tank hquid radioactive waste system coimection penetration and the containment sump pumps combined discharge penetration. Both penetrations are provided with isolation valves inside and outside containment, which are actuated by the containment isolation system. 

The waste water system collects non-radioactive waste from floor and equipment drains in auxiliary, annex, turbine, and diesel generator building sumps or tanks. 

A wet method may be used especially when secondary liquid waste treatment facilities are available. Drains should be provided for washing solutions at the bottom of the equipment involved. These drains should be connected to the radioactive liquid waste collection system, or to its equivalent. 

Leakages and drains are collected in a liquid waste system that is designed to permit maximum reuse of water in a simple process most of the collected water is chemically pure and may be reused as processed demineralized water after treatment in filters and ion exchangers. Excess water and "unclean water is discharged, if its "quality is acceptable, i.e., with low radioactivity, and low content of other unacceptable products otherwise, it is passed through an evaporator. Then the cleaned water can be reused or discharged the evaporator residues are conveyed to the solid waste system. 

Deferred Dismantling or Safe Enclosure (Safestore) - Those parts of the facility containing radioactivity are processed or brought into a condition such that they can be stored and maintained in a safe manner (e.g., liquids are drained from the system and irradiated fuel and operational waste materials removed). The facility is placed in long-term storage (e.g., 50 years) prior to later dismantling. This option allows for decay of radionuclides. 

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