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The linear ageing model is suitable for modelling ageing mechanisms which cause a cumulative degradation in the component so as to continually increase its failure rate. The model is thus applicable to such ageing processes as linear wear, linear material buildup and linear elastic related phenomena. It can also serve as a first order linear approximation, even where the degradation buildup is not linear or independent of the previously-accumulated damage, such as that due to vibration. The inaccuracies due to using the linear model will often be overshadowed by the data uncertainties.
The most likely time to failure is l//a~. Aging Hite (PerYr. 4. Time to first failure probability density functions resulting from different ageing rates for the linear ageing model. Fig. 5 illustrates the component ageing risk sensitivities (r) calculated using the linear ageing model in Ref.  and the Calvert Cliffs PRA model described in Ref. . The risk sensitivity calculated is the sensitivity of the core melt frequency. The sensitivities are grouped by type of component with the individual points showing the a + + 10-110-510' 6 - D 0 I 0 * V „ 7 + 10-710-8- 6 a | 10-3- X 8 * 10-10.
3. 4). In addition, for each of the speculative problems identified during the first workshop as going beyond the 14 generic component types, a five minute 'brainstorming1 session was held to solicit comments and recommendations. Using the results of these sessions, plus the written input provided by some participants a list of potential problems was developed which also gives some pertinent comments on each problem and an assessment of the perceived importance of the problem. 4. Sample of the table of generic component ageing problems (How to detect and how to prevent/cope/handle them) PRESSURE SENSORS FAILURE MODE AND/OR MECHANISM OF FAILURE 1.