The analytic methods and calculations are described below. The system descriptions are based design information obtained from the Ignalina Nuclear Power Plant. Table 1 summarizes the variable trips, logical trips, and control variables used in the control system descriptions. A page of listing all control variables, trips, and tables follows Table 1. Sections 4.1 through 4.11 discuss the development of the control logic.
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Table 1. Listing of Control System Control Variables, Trips, and Tables |
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Description |
Control Variable |
Variable Trips |
Logical Trips |
Tables |
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Section 4.1 |
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ECCS Short-term Actuation |
110 - 113 |
1110 |
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ECCS Long-term Actuation |
211, 221, 231 |
120 - 129 |
1111 - 1126 |
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Section 4.2 |
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FAS Actuation Signal |
520 |
130 - 131 |
1130 - 1131 |
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FAS Reactivity |
521 - 525 |
1131 |
525 |
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AZ-1 Actuation Signal - TCV closure - MCP trip - Low MCP flow - Low FW flow - Hi/Lo Drum Level - High Drum Pressure - AZ-1 Signal |
535 - 538 530 - 532 211, 221, 231 |
140 - 141 150 - 153 160 - 163 166 - 168 170 - 175 180 - 182 190 |
1140 1150 - 1155 1160 - 1165 1166 - 1167 1170 - 1174 1180 - 1181 1190 - 1198 |
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AZ-1 Reactivity |
535 |
1198 |
535 |
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AZ-3 Actuation Signal |
140 - 141 |
1142, 1200 - 1203 |
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AZ-4 Actuation Signal - MCP trip - Low FW flow - Lo Drum Level - Low MCP flow - AZ-4 Signal |
500 - 502 |
220 - 222 230 - 232 250 |
1210 - 1217 1220 - 1222 1230 - 1231 1240 - 1241 1250 - 1256 |
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AZ-3 and AZ-4 Power Reduction |
550 - 562 |
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Section 4.3 |
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Drum Level Controller - General - MFW - AFW - LHS - RHS#1 - RHS#2 |
200 - 201 202 - 203 205 - 206 210 - 219 220 - 229 230 - 239 |
320 330 |
1320 - 1321 1330 - 1331 |
200 |
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Section 4.4 |
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Steam Pressure Controller - General - LHS - RHS |
300 - 303 310 - 317 320 - 327 |
300 - 304 |
1300 - 1301 1302 1303 - 1304 |
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Section 4.5 |
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Core energy deposition |
1 - 11 |
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Section 4.6 |
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Graphite Moderator Feedback - General - LHS - RHS#1 - RHS#2 |
450 - 456 400 - 413 414 - 427 428 - 441 |
400 |
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Section 4.7 |
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Dissipative pump heating |
20 - 24 |
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Section 4.8 |
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Safety Valves - MSV - SDV-A |
600 - 611 |
620,621,625,626 |
1620-1622,1625-1627 |
600, 601 |
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Section 4.9 |
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SDV-C Logic |
600 - 611 |
630,631,635,636 |
1630-1632,1635-1637 |
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Section 4.10 |
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MCP trips |
104 - 107 |
1104- 1107 |
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Section 4.11 |
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Miscellaneous - Always true trip - Loss of offsite 6 kV power - Always false - Recirculation flow |
701 - 704 |
101 102 103 |
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