Big Chemical Encyclopedia

Chemical substances, components, reactions, process design ...

Articles Figures Tables About

SYSTEMS SUMMARY DESCRIPTION

This section provides a summary description of what this management system document contains. Some organizations choose to place their incident investigation policy statement here. [Pg.32]

After the System 80+ applicable issues were identified, a methodology for the documentation of the technical resolution of each issue was developed. Each applicable issue is comprised of four sections ISSUE, ACCEPTANCE CRITERIA, RESOLUTION and REFERENCES. The ISSUE statement section consists of a brief summary description of the safety issue. This is followed by the ACCEPTANCE CRITERIA section. These criteria are taken from NUREG-0933 in most cases, and, in the absence of a formal NRC resolution, developed from accepted industry codes, guidelines, standards and/or good engineering practice. The RESOLUTION section contains the technical resolution of the safety issue which is based upon the System 80+ Standard Design as described within CESSAR-DC or other pertinent documentation as listed in the REFERENCES section. This four part structure for each safety issue is intended to establish how each safety issue is resolved in a clear and concise manner. [Pg.12]

The following sections will concentrate on procedures which are applied for operational decontamination of reactor components, systems and circuits, i. e. decontamination of materials that are going to continue to be used, often for decades a summary description of the relevant topics has recently been published by IAEA... [Pg.380]

The chemical and volume control system valves are stainless steel for compatibility with the borated reactor coolant. All the isolation valves are actuated by the containment isolation system in addition, they can all be actuated manually from the main control room. The containment isolation valves are described in Section 9.3.6.3.7 of Reference 6.1 a summary description is provided below. [Pg.216]

Westinghouse Electric Corporation, Summary Description of Westinghouse Pressurized Water Reactor Nuclear Steam Supply System (1979), available from Westinghouse Water Reactor Divisions, Pittsburgh, Pennsylvania. [Pg.380]

For the apphcation of Failure Modes and Effects Analysis was used the Table 3 that consists of four columns component (identifying each component belonging to the system), function (summary description and precise task that must carry out by the component), potential failure mode (description of how the loss of function is observed by operating staff) and cause of failure (simple and concise description of the causes that generate the occurrence of the failure mode) (BRITISH STANDARD, 2007). [Pg.828]

There are two problems in the manufacture of PS removal of the heat of polymeriza tion (ca 700 kj /kg (300 Btu/lb)) of styrene polymerized and the simultaneous handling of a partially converted polymer symp with a viscosity of ca 10 mPa(=cP). The latter problem strongly aggravates the former. A wide variety of solutions to these problems have been reported for the four mechanisms described earlier, ie, free radical, anionic, cationic, and Ziegler, several processes can be used. Table 6 summarizes the processes which have been used to implement each mechanism for Hquid-phase systems. Free-radical polymerization of styrenic systems, primarily in solution, is of principal commercial interest. Details of suspension processes, which are declining in importance, are available (208,209), as are descriptions of emulsion processes (210) and summaries of the historical development of styrene polymerization processes (208,211,212). [Pg.521]

Even, limited PSAs use and contain much information. This information may come as memos and process reports and flow sheets, equipment layout, system descriptions, toxic inventory, hazardous chemical reactions, test, maintenance and operating descriptions. From this, data and analyses are prepared regarding release quantities, doses, equipment reliability, probability of exposure, and the risk to workers, public, and environment. An executive summary analysis is detailed, and recommendations made for risk reduction. Thus the information will be text, calculations of envelope fracture stresses, temperatures, fire propagation, air dispersion, doses, and failure probabilities - primarily in tabular form. [Pg.300]

In summary, Eq. (86) is a general expression for the number of particles in a given quantum state. If t = 1, this result is appropriate to Fenni-rDirac statistics, or to Bose-Einstein statistics, respectively. However, if i is equated torero, the result corresponds to the Maxwell -Boltzmann distribution. In many cases the last is a good approximation to quantum systems, which is furthermore, a correct description of classical ones - those in which the energy levels fotm a continuum. From these results the partition functions can be calculated, leading to expressions for the various thermodynamic functions for a given system. In many cases these values, as obtained from spectroscopic observations, are more accurate than those obtained by direct thermodynamic measurements. [Pg.349]

Section 2 mainly focuses on the current efforts to improve the accuracy of quantum calculations using simplified empirical model forms. McNamara and Hillier, in Chapter 5, summary their work on improving the description of the interactions in biological systems via their optimized semiempirical molecular models. Piquemal and co-workers present recent advances in the classical molecular methods, aiming at better reproduction of high-level quantum descriptions of the electtostatic interactions in Chapter 6. In Chatper 7, Cui and Elstner describe a different semiempir-... [Pg.433]

In summary, it appears that the apoptosis pathway can be regulated at various levels (the aforementionned description is far from being exhaustive), while many proteins and cell systems involved in this regulation remain to be discovered. Whereas the cascade of intracellular events implicated in experimentally-induced apoptosis has become more and more elucidated, it is worth noting that only few direct evidences arguing for the presence of an actual apoptosis in the brain of pa-... [Pg.349]

In summary, a successful pressures and impact assessment will be a study in which there is a proper understanding of the objectives, a good description of the water body and its catchment area (including monitoring data), and a knowledge of how the catchment system functions. [Pg.385]

In the following, we give a brief description on how to evaluate the various terms in Equation 1. A more extensive summary of the computational details typically used in our studies as well as the CPU requirements of the MM/PBSA approach can be found elsewhere.11 simply evaluates the average potential energy of the system using the same force field (e.g. Equation 3 of Cornell et al.)12 as used to propagate the molecular dynamics trajectory. [Pg.245]

Some neurons can fire several hundred times per second, secreting neurotransmitter each time. Synapses are remarkable secretion machines destined to undergo millions of repeated exocytic cycles in their lifetime. So how does this process work so fast and so efficiently Answers have gradually emerged from the work of many different laboratories and model systems [73, 74]. An exhaustive description is beyond the scope of this chapter, but a summary of key events and specializations of the synaptic vesicle cycle is useful. This will show how synaptic transmission is optimized spatially and biochemically (see also Chs 6,10 and 22). [Pg.158]

Specifically, SKM seeks to overcome several known deficiencies of stoichiometric analysis While stoichiometric analysis has proven immensely effective to address the functional capabilities of large metabolic networks, it fails for the most part to incorporate dynamic aspects into the description of the system. As one of its most profound shortcomings, the steady-state balance equation allows no conclusions about the stability or possible instability of a metabolic state, see also the brief discussion in Section V.C. The objectives and main requirements in devising an intermediate approach to metabolic modeling are as follows, a schematic summary is depicted in Fig. 25 ... [Pg.188]

In this article I review some of the simulation work addressed specifically to branched polymers. The brushes will be described here in terms of their common characteristics with those of individual branched chains. Therefore, other aspects that do not correlate easily with these characteristics will be omitted. Explicitly, there will be no mention of adsorption kinetics, absorbing or laterally inhomogeneous surfaces, polyelectrolyte brushes, or brushes under the effect of a shear. With the purpose of giving a comprehensive description of these applications, Sect. 2 includes a summary of the theoretical background, including the approximations employed to treat the equifibrium structure of the chains as well as their hydrodynamic behavior in dilute solution and their dynamics. In Sect. 3, the different numerical simulation methods that are appHcable to branched polymer systems are specified, in relation to the problems sketched in Sect. 2. Finally, in Sect. 4, the appHcations of these methods to the different types of branched structures are given in detail. [Pg.42]

The plan of this chapter is the following. Section II gives a summary of the phenomenology of irreversible processes and set up the stage for the results of nonequilibrium statistical mechanics to follow. In Section III, it is explained that time asymmetry is compatible with microreversibility. In Section IV, the concept of Pollicott-Ruelle resonance is presented and shown to break the time-reversal symmetry in the statistical description of the time evolution of nonequilibrium relaxation toward the state of thermodynamic equilibrium. This concept is applied in Section V to the construction of the hydrodynamic modes of diffusion at the microscopic level of description in the phase space of Newton s equations. This framework allows us to derive ab initio entropy production as shown in Section VI. In Section VII, the concept of Pollicott-Ruelle resonance is also used to obtain the different transport coefficients, as well as the rates of various kinetic processes in the framework of the escape-rate theory. The time asymmetry in the dynamical randomness of nonequilibrium systems and the fluctuation theorem for the currents are presented in Section VIII. Conclusions and perspectives in biology are discussed in Section IX. [Pg.85]

Several types of systems have been, or are being, developed. The following descriptions are presented as a brief summary. Detailed descriptions will be found in the chapters devoted to each technology. [Pg.11]

The GALPs require that a current summary of personnel training, experience, and job description be available for all laboratory personnel involved in the design or operation of an automated system. [Pg.145]


See other pages where SYSTEMS SUMMARY DESCRIPTION is mentioned: [Pg.27]    [Pg.118]    [Pg.25]    [Pg.531]    [Pg.335]    [Pg.73]    [Pg.136]    [Pg.393]    [Pg.502]    [Pg.79]    [Pg.276]    [Pg.337]    [Pg.4]    [Pg.154]    [Pg.124]    [Pg.120]    [Pg.63]    [Pg.101]    [Pg.3]    [Pg.89]    [Pg.240]    [Pg.213]    [Pg.46]    [Pg.108]    [Pg.220]    [Pg.4]    [Pg.65]    [Pg.71]    [Pg.701]    [Pg.113]    [Pg.178]    [Pg.506]   


SEARCH



SUMMARY DESCRIPTION

System description

© 2024 chempedia.info