Protection strategy operation changes

The enviiomnental protection aspects of the deconunissioning plan/strategy will be developed further as part of site-specific design, and will be subject to revision throughout the lifetime of the facility to reflect operational changes and events. 

Since flow rate is proportional to the square root of pressure (e.g. to double the flow rate requires a fourfold increase in pressure), the range over which such control strategies can be operated effectively is commonly limited to a nominal value of 25% (Paice et al., 1996). While this range is often adequate to compensate for changes in forward speed due to differences, for example, in field terrain, it is not adequate for making spatially variable applications of plant-protection products. 

The possibility of an attack on any unit in the system is likely to be influenced by what protective measures it has taken. Hence, these probabilities should be treated as endogenous. In the case of the chemical supply chain, terrorists are more likely to focus on targets that are less protected. Future research should examine how changes in endogenous probabilities impact IDS solutions and the appropriate strategies for improving the performance of individual units as well as the operation of the entire chemical supply chain. 

In the case of substances identified as hazardous to health, the Control of Substances Hazardous to Health Regulations 1988 (COSHH) require that exposure to them must be either prevented or controlled. Prevention of exposure can be achieved by either a prohibition on the use of the substance, total enclosure of the source or by substituting a less hazardous substance. Control, on the other hand, may entail an engineering solution, such as the installation and operation of local exhaust ventilation systems, or by changing the process to afford better operator protection. In relatively low risk situations the provision and use of specific items of personal protective equipment may afford the appropriate level of operator protection. In all cases, prevention and control strategies should be supported by the provision of information, instruction and training for staff and adequate supervision. 

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