Support systems installation/removal

Installation and removal of protective systems — The following steps are required for protecting employees when installing support systems (1) securely connect, (2) safely install, (3) never overload members, and (4) install other structural members to carry loads imposed on the support system when temporary removal of individual members is necessary. 

Support methods are discussed in 9.2.4, but whatever the support method selected, an essential part of the method statement is a defined safe method of work. No person should ever enter an unsupported excavation to install or remove supports. The use of proprietary support systems which can be installed safely from existing ground level may help should this situation arise. Methods of work need to take into account the following factors to avoid the risk of workers being struck by the plant itself or of the materials being placed where the visibility of the plant operator is restricted ... 

IPC based applications require post installation support to ensure the system is used effectively and the validated status of the system is maintained. The system must be governed by the Quality Management System in operation at the system s location, i.e., change control, IT management procedures, and security procedures governing the granting and removal of system access. 

These interim cleaners also support the philosophy of just-in-time cleaning. Chlorinated solvents and alcohols find perhaps their widest application as quick-dip-rinse media. When water-soluble coolants are installed, and solvent tanks become obsolete, they must be replaced by a waterbased rinse system. Total reliance cannot, and should not, be placed on the final cleaning system in view of the fact that specialized solvents cannot be used anymore. Water, while an excellent departiculating agent, is not as effective in removing nonpolar contaminants from surfaces. With chemical contamination emerg-... 

The heart of the system is a microreactor packaging scheme that is based upon a commercially available microchip socket. This approach allows the silicon-based reactor die, which contains dual parallel reaction channels with more than 100 electrical contacts, to be installed and removed in a straightforward fashion without removing any fluidic and electronic connections. Various supporting microreactor functions, such as gas feed flow control, gas feed mixing, and various temperature control systems, are mounted on standard CompactPCI electronic boards. The boards are subsequently installed in a commercially available computer chassis. Electrical connections between the boards are achieved through a standard backplane and custom-built input-output PC boards. A National Instruments embedded real-time processor is used to provide closed-loop process control and... 

Subsequent programs to prevent water and air pollution supported by Imperial Chemicals Industries Ltd., British Power Authority consultants, and Howden Construction Co. led to the development of a closed-loop, lime-based, sulfur dioxide removal system. These types of systems were installed in 1935 at the Swainsea and in 1937 at the Fulham power plants. They operated successfully until World War II when they were shutdown because the vapor plumes provided aerial guidance to the Luftwaffe. 

On board the support vessel an electro-chemical oxidation system will be installed which will destroy the organic compounds recovered from the seabed. This system is tightly sealed from the environment and can be operated with slightly negative pressure as an additional safety feature. The transfer container can be docked onto the e.c.o.s. plant and the chemical warfare agent together with the scrap metal is then transferred into the process. Within the process plant the organic compounds are completely and safely destroyed and the scrap metal is scoured to remove any CW residues. 

The reactor cooling system is composed of the MCS, ACS and VCS as schematically shown in Fig. 1. The MCS is operated in normal operation condition to remove heat from the core and send it into the environment. The ACS and VCS have incorporated safety features. The ACS is initiated to operate in case of a reactor scram. Besides one out of two components of VCS has sufficient capacity to remove residual heat, the ACS is provided to cool down the core and core support structure. A helically coiled intermediate heat exchanger (IHX) whose heat-resistant material is Hastelloy-XR developed by the JAERI has been installed in S tember 1994. Nuclear heat application tests using the HTTR, are planned to be carried out, and accordingly a heat utilizaticxi system will be connected to the IHX. The fuel fabricaticm started in June 1995 and will complete in 1997. 

As weU consideration must always he given to the systems and procedures that wfll he pcfft of conveycmce installation, rope up, and removal. Access and maintainability shoifld be relatively straightforwcffd with sufficient headroom and floorspace allowed to support md house any systems that are to be used as part of this process. In the case of drum hoists, the ability to use a winder/tensioner parked in the coUcffhouse, with a temporary sheave(s) at coUcff is a... 

Four primary reactor auxiliary cooling systems (PRACS) are used A cooling coil is installed in the inlet plenum of each IHX and a heat transfer coil is installed in the mr cooler of ultimate heat sink Coolant is circulated by EM pumps supported by emergency AC power The air cooler consists of a blower, a stack, vanes and dampers The blower is supported by the emergency AC power The vanes and the dampers are operated by the emergency DC power Decay heat removal by natural circulation is possible to mitigate a total blackout event (loss of all AC power)... 

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