Research Article
RELAP5/MOD3.3 Code Validation with Plant Abnormal Event
Table 3
Time sequence of main events during transient.
| Event | Measurement | Calculation |
| Turbine flow reduction | 0 second–5 seconds | 0 second–5 seconds | Operator action (start of governor valve opening) | 16 seconds | 16 seconds | SI signal on low steamline pressure | 17 seconds* | 16.7 seconds | SI pump injection start | 21 seconds | 22 seconds | SG power operated relief valve (PORV) opening | 27 seconds | 31 seconds | AFW flow actuation | 42 seconds | 42 seconds |
|
|
*based on 25 seconds delay of AFW actuation.
|