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11 Cards in this Set
- Front
- Back
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Automatic Protective Features |
1) Auto Rod Movement 2) Outward Rod Inhibit (Manual) 3) Auto Turbine Runback 4) Auto Reactor Shutdown 5) Auto ESF Actuation |
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Reactor Protection System Functions |
1) Limits the consequences of Condition II events by, at most, shutdown of the reactor and turbine with the unit capable of returning to operation 2) Bounds plant operation so that: a) Reactor Safety limits are not exceeded during Condition II events b) Condition II events are accommodated without developing into a more serious event 3) Auto initiates reactor trip a) When necessary to prevent fuel damage for an anticipated malfunction b) To limit core damage for infrequent faults c) So that energy generated in the core is compatible with design provisions to protect RCS boundary for limiting fault |
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ESF Actuation System Functions |
1) Limits the consequences of Condition III events 2) Acts to mitigate Condition Iv events |
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ANS Condition I |
Normal operation and operational transients Examples: - All steady state and shutdown operations - Operation with permissible deviations as permitted by TS - Normal transients such as plant heat up / cool down, step load changes, ramp load changes |
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ANS Condition II |
Faults of moderate frequency Examples: - Loss of normal feedwater flow - Increase in secondary steam flow - Loss of external load - Turbine trip |
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ANS Condition III |
Infrequent Faults Examples: - Minor steam piping failure - Complete loss of forced reactor coolant flow - Waste gas system failure |
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ANS Condition IV |
Limiting Faults Examples: - Steam system piping failure - Feed water system pipe break - RCP shaft seizure - RCCA ejection - S/G tube failure - Fuel handling accidents |
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SSPS General Warnings |
1) Bypass breaker closed 3) Loss of any 48 VDC or 15 VDC power supply 4) Logic A, Permissives or Memories Switches out of "OFF" 5) Fuse blown (Ground return) 6) Slave relay mode selector switch in "TEST" 7) Any loose or missing cards 8) Multiplexer test switch in "INHIBIT" 9) Loss of power to Aux Relay or Output Cabinet |
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Types of SSPS Tests |
1) GO TEST - Results in actual component actuation 2) BLOCK TEST - Prevents actuation of components (provides test light indication) |
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2RCS-LT459/461 controlling channel fails low |
1) 2CHS-LCV460B fails closed 2) All orifice isolation valves fail closed (2CHS-AOV200A/B/C 3) PZR heaters shutoff 4) Charging flow increases 5) Actual PZR level increases 6) Rx Trip at 92% |
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2RCS-LT459/461 controlling channel fails high |
1) Charging flow decreases to min. value; PZR level drops to low level (14%) 2) Letdown isolation valve 2CHS-LCV460A closes 3) All orifice isolation valves lose (2CHS-AOV200A/B/C) 4) PZR heaters shut off 5) Actual PZR level increase due to min. charging flow and seal inj.; heaters turn back on 6) reactor trips at 92% |
