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33 Cards in this Set
- Front
- Back
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Which RCS loop does the Letdown Line tap off?
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Loop B Tc
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What will auto close RC-427, Letdown Isolation Valve? - What is the power supply for RC-427? - What will happen if RC-427 loses power? |
RC-427 auto closes at 12% in the Pressurizer - Powered from 1(2)B-42 - When RC-427 loses power or leaves its open seat the Letdown Orifice Isolation Valves CV-200A, B, and C will go shut. |
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What will auto close CV-200A,B, and C Letdown Orifice Outlet Isolation Valves?
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- RC-427 Leaving its open seat - RC-427 Losing power - Securing the final charging pump - Closing CV-371 or 371A, Letdown Containment Isolation Valves |
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What is the purpose of CV-203 Relief Valve? - What is its setpoint? - Where does it relieve to? |
CV-203 protects the low pressure section of CVCS Letdown, and RHR. - Set for 600 psig, capacity of 160 gpm (full letdown flow) - Relieves to the PRT. |
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What is the purpose of the delay loop in the letdown line?
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Allows for the decay of N-16 gammas. @ 40gpm will give a 67 sec time delay. |
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What is the purpose of CV-133, RHR to Letdown Control valve? - RH-703 RHR to Letdown cross connect? |
Allows for the initial pressurization of the RHR system. - RH-703 allows RHR to use CV-203 relief valve for overpressure protection. |
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What is the purpose of CV-369A RHR to Letdown Cross Connect valve?
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CV-369A allows purification with CVCS demins when on RHR.
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How is the NRHX temperature controlled? - What is the fail position of the control valve? - How are the ill effects of this failure minimized? |
NRHX temperature is controlled by CC-130, NRHX TCV. - CC-130 fails open on a loss of control air. - CC-130 is gagged to prevent it from going full open. Limits flow to 685 gpm. |
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What is the purpose of CV-135 Letdown Line PCV? - What is the fail position of this valve? |
CV-135 maintains letdown line pressure downstream of the letdown orifices and upstream of CV-135 at 250 psig. Also is used to maintain RCS pressure when solid.
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What is the purpose of CV-209, Low Pressure Letdown Relief Valve? - What is the capacity of this valve? - Where does it relieve to? |
CV-209 Relieves at 200# on Low Pressure Letdown. - Capacity is 160 gpm, maximum letdown flow. - Relieves to VCT. |
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What is the purpose of CV-145, Letdown Temperature Divert Valve? - What is the setpoint? |
CV-145, Letdown Temperature Divert Valve directs letdown line flow around the demineralizers and to the VCT on high letdown line temperature. Protects Demin resin. - Setpoint is 145F. |
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What is the purpose of the Reactor Coolant Filter? - When do the filters need replacing? |
Reactor Coolant Filter removes resin fines from the CVCS water after it leaves the demins. Replace at 20 psid. |
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What is the minimum VCT pressure for RCP operation? What does this pressure provide?
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Minimum pressure in the VCT for RCP operation is 15 psig. This maintains adequate backpressure on the #2 RCP seal.
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What processes send water to the VCT via the common return header? - How is this line introduced to the VCT? |
Excess Letdown, sample Returns, and relief valves send water to the common return header to the VCT. - Enters under the water line to prevent steam from entering the VCT without being condensed. |
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What is the primary use of the HUTs where CVCS is concerned? - Which tank is aligned to which Unit? |
The CVCS HUT's receive water diverted from the VCT by CV-112A. - Unit 1 is aligned to T-8C, Unit 2 is to T-8A. |
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What is the interlock associated with CV-112C, VCT Outlet Valve?
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CV-112B, RWST to Charging Pump Suction must be off its shut seat to allow CV-112C to close.
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What is the design flowrate of the CVCS Charging Pumps?
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Charging Pumps are designed for 60 gpm flow.
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What trips are associated with the CVCS Charging Pumps? - How is the instrumentation distributed between pumps? - How would the pumps be affected by a trip signal on 1 set of sensors? |
Charging pumps have a low suction pressure trip @12" Hg with an 8 sec time delay. - Each pump has its own instrumentation. - Only the affected pump will be tripped by a low suction pressure signal on one set of instruments. |
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What alarms are provided by the Charging Pump VFD's?
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- Hi Speed @ 1740 rpm (max 1900, trip at 2000) - Low Speed @ 527 rpm (min is 480) - High Frequency - Overcurrent - Undervoltage - High Motor Temp (Local Amber Light) |
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What are the normal and alternate power supplies to the CVCS Charging Pumps?
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1P-2A 1B-03 Normal B-08 Alternate 1P-2B 1B-03 Normal 2B-03 Alternate 1P-2C 1B-04 Normal 2P-2A 2B-03 Normal B-09 Alternate 2P-2B 2B-03 Normal 1B-03 Alternate 2P-2C 2B-04 Normal |
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How does the Charging Pump Control Switch work from Pullout to pump running? - Is there an alternate way to accomplish this? |
Taking the control switch for a charging pump from Pullout to Auto gives you indication (green light. Taking the control switch to start will close the main breaker and power the VFD, starting a 6.5 sec warm up. Taking the switch to start a second time (after the 6.5 sec warm up) will start the pump. - Holding the switch in start for 6.5 sec will cause the VFD to warm up and the Charging Pump to start. |
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What is the soft start feature of the VFD?
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Regardless of controller manual potentiometer output the charging pump will start at minimum, and then will slowly ramp up to the designated output.
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How is a charging pump started if using the alternate power supply breaker?
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The charging pump breaker is controlled from the alternate control switch, opposite unit C-04 or B-08/09, and the pump is controlled from the normal switch and controller.
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What is the purpose of CV-142 Charging Line Flow Control Valve? - How does this valve fail? |
CV-142 controls backpressure on the charging line, forcing flow to the RCP seals. - CV-142 fails open. |
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Where do the charging pump relief valves relieve to. - What is their setpoint? |
Charging Pum[p Discharge Relief valves relieve to the charging pump suction. - Set for 2735 psig. |
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What flow is represented by F-128, Charging Line Flow?
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Only charging line flow is represented on F-128, Seal Injection Flow is indicated outside PW 1 & in Pipeway 4.
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What RCS loop does the Normal Charging Line penetrate? - How is the charging line connected to the RCS? |
Normal charging is sent to A Tc vi CV-1298, Charging Line MOV. - Connected to the RCS via a thermal sleeve. |
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What is the purpose of the Seal Injection Filters?
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Seal Injection Filters remove all particulate from the seal injection lines protecting the RCP seals.
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What is the purpose of the seal return MOV's CV-270A and B? - What alarms are associated with the seal returns? |
Seal return MOV's isolate seal returns from the VCT. - High Seal Return Flow @ 4.6 gpm Low Seal Return Flow @ 0.9 gpm High seal return temperature @190F |
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What is the purpose of CV-314, Seal Return Relief Valve? - What is its setpoint? - What is the capacity of CV-314? |
CV-314 lifts to maintain seal return flow / direct it to the PRT. - Lifts at 150#. - Capable of passing 2 RCP seal return flows and XSLD. |
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Where does Excess Letdown tap off of the RCS? - What happens to Excess Letdown on a CI? - If this occurs, what action is required? |
Excess Letdown comes from Loop A Tc. - CC-769 closes on a containment isolation, taking away cooling to the XSLD Heat Exchanger. - Manual action is required to isolate excess letdown if this occurs. |
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What functions are provided by VCT Level Channel L-112, and what are their setpoints?
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78% - CV-112A Divert full flow to the HUT
70% - High Level Alarm Reset 70% - CV-112A Resets to VCT 28% - Auto Makeup Stops 17% - Auto Makeup Starts 4% - CV-112B Auto Opens to Makeup from RWST (Also requires 4% on L-141) |
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What functions are provided by VCT Level Channel L-141, and what are their setpoints?
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78% - High Level Alarm 56% - Modulate for CV-112A 8% - Low Level Alarm 4% - CV-112B Auto Opens to Makeup from RWST (Also requires 4% on L-112) |
