Design extension conditions

The limit releases for the conditions more serious than the design ones (Design Extension Conditions, DEC) with reference to the absence of emergency actions within 800 m and 3 km from the plant. 

EUR not only uses the expression severe accidents but also the expression design extension conditions . EUR are very complete and quantitative in defining the various safety and radiation protection objectives. 

For certain design extension conditions there may be exceptions to be considered on a case-by-case basis (see Chapter 2-19). 

Accident management includes pre-planned and ad hoc operational practices which, in circumstances in which the design basis specification of the plant is exceeded, would make optimum use of existing plant equipment to restore control. This applies to design extension conditions (i.e. to prevention of core damage and mitigation of severe accidents) (see Section 2-1-4). 

For the SCOR, transients in the design extension conditions are essentially eliminated ... 

Criterion 20. Design extension conditions Limited set of events more severe than DBAs [station blackout, anticipated transients without scram (ATWS), aircraft impact, etc.] for design extension requirements. The design shall be such that design extension conditions that could lead to significant radioactive releases are practically eliminated. 

The performances and estimating methods of welded PHEs match those of gasketed PHEs in most cases, but normally the Compabloc, with larger depth of corrugations, can be lower in overall coefficient. Some extensions of the design operating conditions are possible with welded PHEs, most notably is that ciyogenic applications are possible. Pressure vessel code acceptance is available on most units. 

From the slope, e.g., D can be calculated provided that all other quantities are known, while the intercept gives Qc + Qads- At very short times Q vs. t1/2 curves are not linear, since neither the charging process nor the oxidation of the adsorbed amount of reactant is instantaneous, albeit under well-designed experimental conditions (see above) this period is less than 1 ms. This effect is indicated as dotted extensions of lines 1 and 2 in Fig. 2. 

Proschan MA, Hunsberger SA (1995) Designed extension of studies based on conditional power. Biometrics 51 1315-1324. 

By application of methods of experimental design, optimum conditions have been found for the preparation of a secondary amine [33]. We particularly recommend the paper of Meiners et al. [33] to the reader, inasmuch as it is one of the few reports describing a statistical design of experiments to a problem in organic synthesis, a procedure which is now finding more extensive application in the laboratory as well as in industry. 

Many empirical correlations have been pubHshed in the Hterature for various types of Hquid atomizers, eg, one book (2) provides an extensive coUection of empirical equations. Unfortunately, most of the correlations share some common problems. Eor example, they are only vaHd for a specific type of atomizer, thereby imposing strict limitations on thein use. They do not represent any specific physical processes and seldom relate to the design of the atomizer. More important, they do not reveal the effect of interactions among key variables. This indicates the difficulty of finding a universal expression that can cover a wide range of operating conditions and atomizer designs. 

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