Solid Radwaste System

The liquid and solid radwaste systems are operated from control panels in the radwaste control room. Programmable controllers are used in this application. 

The second block includes the reactor auxiliary and waste management building, housing the reactor water cleanup system and the liquid and solid radwaste systems, the radioactive maintenance shops, housing the active workshop, and storage rooms for potentially radioactive waste. 

The system has sufficient temporary waste accumulation capacity based on maximum waste generation rates so that maintenance, repair or replacement of the solid radwaste system equipment does not impact power generation. 

The radioactive inputs to the liquid, gaseous, and solid radwaste systems are covered in Chapter 11 of the EDCD (Reference 12.1). 

Primary containment is provided by drums and other container that will be utilised. Secondary containment will be provided by the floor, walls, and roof of the Radwaste Building and the external stores. Further details on the solid radwaste system, including drums and other waste containers, are provided in Environment Report (Section 3.5) and IWS report (Reference 14.7). 

Management systems and process will be developed during the site licence application phase (Chapter 9 of this PC SR). This will include systems and processes relating to the operation of the solid radwaste system, including monitoring its integrity. 

Solid Radioactive Wastes - the Environment Report, section 3.4 of the Environment Report (reference 15.6) summarises the sources of solid radioactive waste, the solid radwaste system (WSS), and a BAT assessment for the chosen design options. 

The solid radwaste system is described in detail in Section 11.4 of Reference 15.14 and summarised in the Enviromnent Report. The system categorises solid radioactive waste as high-level waste (HLW), intermediate-level waste (ILW), or low-level waste (LEW) (see Enviromnent Report, Figures 3.4-1 3.4-2). The solid radwaste system comprises a radwaste building for handling and sorting LLW and an LEW buffer store area. 

The letdown flow outside containment isolation valve is a normally closed, fail closed, air-operated globe valve that isolates letdown to the liquid radwaste system. This valve automatically opens and closes on a plant control system signal from the pressuriser level control system or a containment isolation signal from the protection and safety monitoring system. Ibis valve operates in the same fashion as the letdown flow inside containment isolation valve. The letdown flow outside containment isolation valve eloses more quickly than inside containment letdown flow isolation valve to limit seat wear of inside containment isolation valve. This valve operator has a flow restricting orifice in the air line, so it opens more slowly than inside containment letdown flow isolation valve. In addition, during brief periods of shutdown, when the reactor coolant system is water solid, this valve throttles to maintain the reactor coolant system pressure. Manual control is also provided in the main control room and at the remote shutdown workstation. 

During the operational lifecycle of the APIOOO, solid radioactive wastes will be generated. Further details on the sources of solid radioactive wastes and the solid radwaste treatment system are provided in Section 3.5 of the Environment Report (Reference 14.4) and Integrated Waste Strategy (IWS) report (Reference 14.7). The solid waste streams comprise ... 

All solid radwaste will be monitored as it enters and leaves the system. Further details of the various monitoring proposed are provided in the Section 3.5 of the Environment Report (Reference 14.4), which covers both monitoring of waste packages and of working/storage areas. 

The APIOOO radioactive waste (radwaste) management systems control the handling and treatment of liquid, gaseous, and solid radwaste produced within the Nuclear Island ... 

The solid wasfe processing systems include the radwaste volume reduction/snlidifiratinn system and the radwaste incinerator. The systems reduce in volume and solidify low-level radioactive planf wasfes to prepare them for safe storage and/or disposal. The radwaste volume reduction/solidification system employs a vacuum-cooled crystallization process to effect volume reduction, coupled with high speed, higher shear mixing of the waste with cement to achieve solidification. For combustible plant wastes, the radwaste incinerator utilizes a controlled air incineration process. 

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 solid waste management system is designed to collect and accumulate spent ion exchange resins and deep bed filtration media, spent filter cartridges, dry active wastes, and mixed wastes generated as a result of normal plant operation, including anticipated operational occurrences. The system is located in the auxiliary and radwaste buildings. 

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