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Or valve is leaking due to disk/seat surface degradation" accounts for 21% of the failure symptom categories. 2 Dominant failure cause categories. A2 Deficient/incomplete procedures for testing/maintenance, insufficient work control account for 50% of the failure cause categories. D2 Deficiencies in design, construction, manufacturing corrected by procedure related actions account for 20% of the failure cause categories. D1 Deficiencies in design, construction, manufacturing corrected by hardware related actions account for 18% of the failure cause categories.

2. ICDE Coding Guidelines (NEA/SEN/SIN/WG1(98)3). 3. Marshall, F. , D. M. Rasmuson, and A. Mosleh, 1998. S. Nuclear Regulatory Commission, NUREG/CR6268, INEEL/EXT-97-00696, June.

1 % of the events as being caused by hardware problems and being corrected by hardware measures. 4 Technical fault aspects Mechanical wear (35%) missing control signals (18%) and incorrect mechanical adjustment of valve mechanism (15%) are dominant. It appears that a significant portion of these three technical faults could have been avoided by better test/maintenance strategies. 5 Complete CCF events There are 14 complete CCF events (9% of the of the included 149 events). Five complete CCF events evidently involve human error, 5 more are suspected to also involve human influence, as the licensee chose changes to test/maintenance procedures as corrective action (presumably shorter test or maintenance intervals).

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Advanced Molten-Salt Reactor Using High-Temperature Tech [pres. slides]


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