Term
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Definition
Moisture Separator Tank high level (927' 6" with 10 second time delay); Rx High level (+48"); Main Condenser Low Vacuum (20" Hg Vac); Turb exhaust hood high temp (225 degrees F); Turb Thrust bearing high wear; Gen neg sequence; Gen loss of field; Gen lockout; Gen stator loss of cooling; Control switch.
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Term
Moisture Separator Tank High Level (Turbine Trip setpoint) |
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Definition
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Term
Main Condenser Vacuum (Turbine Trip setpoint) |
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Definition
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Term
Turbine Exhaust Hood high temp (turbine trip setpoint) |
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Definition
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Term
| Automatic Actions for Turbine Lockout |
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Definition
Turbine Stop Valves CLOSE; Generator Output Breakers (8N4 and 8N5) OPEN; Generator Field Breaker OPEN; Reactor scram (if above 30% reactor power)
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Term
| When is Stop Valve and Control Valve closure scram bypassed? |
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Definition
| 125 psid (approx 30% reactor power) |
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Term
| Capacity of turbine bypass valves |
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Definition
| Approx 14% (1,010,786 lbm/hr) |
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Term
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Definition
| Maintains LP exhaust hood temp less than 175 degrees F during low power operation when steam flow can not keep blades cool. |
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Term
| Range of Mechanical Pressure Regulator |
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Definition
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Term
| Range of Electrical Pressure Regulator |
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Definition
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Term
| Power supply to Shaft turning gear |
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Definition
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Term
| Inputs to Turbine SPEED Control |
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Definition
| Speed Governor, Speed/Load Changer, Load limit |
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Term
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Definition
Setpoint: 20"Hg Vac Designed to trip the turbine to protect the main condenser from overpressurization |
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Term
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Definition
Setpoint: 9.2" Hg Vac (B-manual incorrectly states 7" Hg) Acts only on the BYPASS VALVES. Designed to protect the turbine exhaust hoods from being overpressurized through bypass steam after the Turbine has been tripped by vacuum trip #1. |
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Term
| List the feedwater heaters and which turbine stage goes to each |
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Definition
11 htr: 12th stage; 12 htr: 10th stage; 13 htr: 8th stage; 14 htr: 7th stage; 15 htr: 6th stage.
NOTE: stage 6 is HP Turbine and the other stages are LP Turbine. |
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Term
| Where does the steam pressure control system get its steam pressure signal? |
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Definition
| Pressure averaging manifold |
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Term
| List the criteria for turning gear motor auto start. |
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Definition
Oil pressure to bearing greater than 15 psig; Turbine speed less than 0.6 rpm (low speed switch activated); 8N4 and 8N5 open; Turning gear not already engaged; Control switch in auto.
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Term
| List the criteria for turning gear to auto engage. |
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Definition
Turbine speed less than 0.6 rpm (low speed switch actuated); All three lift pumps are running; Turning gear motor is running.
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Term
| Power supply to Aux Oil pump |
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Definition
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Term
| Power supply to Lift Pumps |
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Definition
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Term
| Power supply to Emergency Bearing Oil Pump |
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Definition
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Term
| List the turbine shaft acceleration rates |
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Definition
Rates are based on 1st stage bowl temperature: |
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Term
| List the turbine shaft critical speeds |
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Definition
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Term
| State the purpose and location of the shaft grounding braid |
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Definition
Purpose: remove shaft voltage; Location: by #6 and #7 bearings |
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Term
| Power supplies to stop valves |
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Definition
| A, C: MCC-112; B,D: MCC-142 |
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Term
| Power supplies to control valves |
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Definition
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Term
| Power supply to vacuum trip |
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Definition
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Term
| State the operating requirements for turning gear operation prior to rolling the shaft. |
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Definition
| Turbine Generator must be on turning gear operation for a minimum of four (4) hours and until rotor eccentricity is normal for a minimum of one (1) hour prior to rolling off the gear. |
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Term
| State the different lube oil cooler outlet temperature ranges |
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Definition
Normal operation: 110-112 degrees F; Turning gear operation: 80-90 degrees F. |
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Term
| HP turbine first stage bowl temperature rate of change limit |
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Definition
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Term
| LP turbine exhaust hood temperature limit |
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Definition
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Term
| Limit of lube oil temperature rise across bearings |
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Definition
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Term
| Individual bearing sudden metal temperature rise on TR-1717 |
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Definition
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Term
| State the general precaution associated with Turbine bypass valves |
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Definition
| Turbine bypass valve position is an input to the nuclear instrumentation (IRM) heat balance. Any change to this parameter, or its measurement, or steam flow rate of any given position will affect calculated thermal power |
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Term
| What is the concern with leaving the turbine generator on the turning gear for extended periods of time? |
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Definition
| There is no centrifugal force to hold the generator windings in their normal position which could result in rubs which lead to copper dusting which could lead to arcing and/or shorts. |
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