Contingency analysis

Moreover, when examined for co-occurrence, K. veneficum and P piscicida co-occur more frequently than expected. A contingency analysis of 878 samples (ending February 2004) in which molecular detection for Pfiesteria spp. and K. veneficum in Maryland samples was performed found that P. piscicida co-occurred with K. veneficum more frequently than expected (p =. 009, Fisher s Exact test). We believe that this co-occurrence is driven by a preference for a common prey item, crytophytes. 

Table 6.4-3 Double Contingency Analysis for HCF Operations with Fissile Material.6-6...

A CSA is required for operations that involve total amounts of fissile material in excess of the threshold amount for non-aqueous forms (700 g U) where formal criticality safety evaluations and controls are required [Philbin, 1998, Criticality Safety Supplement to the SNL ES H Manual, Applicability Section]. The CSA requires that process designs incorporate a double-contingency principle so that at least two unlikely, independent, and concurrent changes in process conditions must occur before an accidental nuclear criticality is possible. Table 6.4-3 is a qualitative summary of the double contingency analysis from the CSA for isotope processing [Mitchell and Romero, 1999 (draft). Section 5]. 

The parameters that guide the contingency analysis are the nine physical factors that affect the critical state of the system. They are easily remembered using the acronym "MAGICMERV" mass, absorption, geometry, interaction, concentration, moderation, enrichment, reflection, and geometry. 

The three steps of the criticality safety evaluation—contingency analysis, limit determination, and control specification—are presented in a document generally referred to as a Nuclear Criticality Safety Evaluation (NCSE) (although some sites separate out the first step into a separate document referred to as a Nuclear Criticality Safety Assessment (NCSA)). Within a given organization or processing site, the structure and format of NCSA/NCSEs are usually strictly proscribed for consistency of development and ease of use. 

Contingency Analysis An analysis pCTformed to identify what abnormal situations, errors, or malfunctions, a system may develop or encounter to improve system performance or establish what special human responses may be required under those circumstances. 

No detailed contingency analysis has b( eii performed. The appropriate contingency percentage wjus fussigned through a brief analysis of cost and schedvUe risks made by physicists and engineers with exi)erience in tlu construction of a number of major detectors at SLAC. 

Pressure relief device (PRD), such as pressure relief valve (PRV), rupture disk and rupture pm device, are used to protect equipment and lines from overpressure. It is process engineer s responsibility to show the requirement of a PRD at an equipment or line on the P ID drawings. It is also process engineer s responsibility to select the PRD type and its set pressure, and to do a contingency analysis to check out under what conditions the equipment or line will be over pressured, and what the relief rate will be. 

After PRD contingency analysis, process engineer is required to fill out process information on the PRD data sheets, and give them to instrument engineers. The instrument engineer will add more information on the data sheets according to project PRD specification and his/her comments, and send them to vendors for bid. 

Contingency analysis studies the causes of overpressure in equipment Or piping, and how much the relief load will he for each cause. Only one cause will be examined, unless this cause will trip another cause. The reason is that two different causes happened at the Same time is unlikely. This analysis is process engineer s responsibility. 

Contingency analysis is a method of minimising risk in the event of an emergency. Potential accidents are identified and the adequacies of emergency measures are evaluated. 

Contingency analysis should be conducted for any system, procedure, task or operation where there is the potential for harm. Contingency analysis lists the potential accident scenario and the steps taken to minimise the situation. It is an excellent formal training and reference tool. 

Contingency analysis for superjund sites and other industrial sources. Research Tri-... 

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