Target Facilities 7/17
|
Target Facilities 7/17 |
|
2.5.4.1 Failure Mode and Effect Analysis (FMEA)
The evaluation of possible hazards has been performed in qualitative manner at component level for the Target Facilities and related areas using the FMEA.
This technique, which allows to detail systematically all possible failure modes and to identify their resulting effects on the system, is most appropriate to provide the safety-related information and consideration in this early design phase because it can be extended to include more detailed analysis in the later phases of the project.
2.5.4.1.1 Tabulation
Table 2.5.4-1 provides the FMEA factor descriptions. No quantitative analysis is made, and only possible causes and effects of random and support system failures are identified and evaluated.
Table 2.5.4-1. FMEA factors
| Ease of Detection | ||
A |
Easy | Immediately detected and alarmed |
B |
Limited | Detected with delay or needs observation |
C |
Difficult | No detection available |
| Frequency of Occurrence | ||
A |
Operational events | More than once per year |
B |
Likely events | 1/year ~ 10-2/year |
C |
Unlikely events | 10-2~ 10-4/year |
D |
Extremely unlikely events | Less than 10-4/year |
| Risk Potential | ||
I |
Normal | Operational caution required |
II |
Danger | Limited function |
III |
Minor hazard | Immediate halt and repair |
IV |
Major hazard | Accident, damage of facility |
V |
Extreme | Possible environmental effect |
2.5.4.1.2 Failure modes and effects analysis for IFMIF target system
The hazard analysis oriented towards detailing, on a component-by-component basis, all possible failure modes components and identifying their effects on the lithium target system is reported in [23] and [24].
In tables 2.5.4-2 and 2.5.4-3 only hazard analysis of the principal and most important components is provided.
Table 2.5.4-2. Lithium target system
|
Target Facilities 7/17 |
|