Term
| Explain the purpose and function of the RPS. |
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Definition
| Initiate an automatic reactor scram if monitored system variable exceed pre-established limits; Provides for manual initiation of rapid control rod insertion. |
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Term
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Definition
RPS A: MG set A Y-50 (MCC-111); RPS B: MG Set B Y-40 (MCC-141); Alt to either MG Set: Y-60 (MCC-111) |
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Term
| Scram Discharge Volume Rod Block |
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Definition
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Term
| Scram discharge Volume automatic scram |
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Definition
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Term
| Relative to Scram Discharge Volume, what is required to reset a scram? |
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Definition
| SDV high water level bypass switch in BYPASS with MODE switch in S/D or REFUEL. |
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Term
| Sequence when MODE switch is taken from RUN to SHUTDOWN |
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Definition
Full scram to ensure all rods fully inserted in shutdown mode. Contacts are located on RPS subchannels A3 and B3 (manual scram). After two seconds, the scram signal is automatically bypassed, but requires a manual reset. |
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Term
| Discuss Delayed Scram Reset Interlock |
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Definition
| 10 second time delay prevents resetting a scram prior to all rods having completed their scram travel. |
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Term
| Power supplies to reactor vessel low water trip units. |
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Definition
Analog trip units have dual power supplies. Channels A and C receive power from RPS bus A (Y50) and Y70. Channels B and D receive power from RPS bus B (Y40) and Y80. NOTE: Channels A and B are located in Cable Spreading while C and D are located on 3rd floor EFT. |
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Term
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Definition
| 120 out of 125 or IRM INOP (NOTE: bypassed when APRMs are above 3.5 % and/or mode switch in RUN) |
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Term
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Definition
A1: IRM 11, 13; A2: IRM 12, 14; B1: IRM 15, 17; B2: IRM 16, 18" |
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Term
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Definition
APRM INOP, DOWNSCALE or HI HI (based on flow-biased setpoint or 119.5%, whichever is lower) NOTE: HI hi is bypassed unless mode switch is in RUN |
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Term
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Definition
0.66W + 65.1 for two loop; 0.66(W-5.4) + 65.1 for single loop; where W is percent recirc flow required to establish rated total core flow (57.6 Mega poundsmass per hour) |
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Term
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Definition
A1: APRM 1, 3A A2: APRM 2, 3B B1: APRM 4A, 6 B2: APRM 4B, 5 |
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Term
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Definition
When appropriate shorting links are removed, any one SRM Hi-hi trip will cause a full scram. Setpoint: 5X105 cps |
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Term
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Definition
A1: SRM 21 A2: SRM 22 B1: SRM 23 B2: SRM 24 |
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Term
| Reactor High Pressure scram setpoint |
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Definition
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Term
| Reactor Vessel Low Water Level scram setpoint |
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Definition
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Term
| Primary containment high pressure scram setpoint |
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Definition
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Term
| Main condenser low vacuum scram setpoint |
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Definition
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Term
| Turbine control valve fast closure scram setpoint |
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Definition
Less than 172.5 psig oil pressure to acceleration relay (bypassed until first stage pressure reaches 30% of its full power pressure) |
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Term
| Purpose of turbine control valve fast closure scram setpoint |
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Definition
Prevents insertion of significant amounts of positive reactivity due to a large pressure excursion . 172.5 psig oil pressure |
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Term
| Turbine stop valve closure scram setpoint |
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Definition
| Any three turbine stop valves open less than 90%. NOTE: rod block on any two less than 90% open and alarm for any one less than 90% open |
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Term
| Turbine stop valve inputs to RPS |
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Definition
A1: SV-1 and SV-2 A2: SV-3 and SV-4 B1: SV-1 and SV-3 B2: SV-2 and SV-4 |
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Term
| Main steam line isolation valve closure scram setpoint |
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Definition
| Any three main steam isolation valves less than 90% open. |
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Term
| Main steam line isolation valve inputs to RPS |
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Definition
A1: AO-2-86A/B and AO-2-80A/B A2: AO-2-86C/D and AO-2-80C/D B1: AO-2-86A/C and AO-2-80A/C B2: AO-2-86B/D and AO-2-80B/D |
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Term
| Turbine stop valve closure and control valve fast closure bypass setpoint |
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Definition
| Bypass in effect until 1st stage pressure is 30% of its rated full power pressure |
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Term
| Main steam isolation valve closure and condenser low vacuum bypass setpoint |
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Definition
Bypassed until reactor pressure reaches 600 psig. NOTE: this bypass is dependent on mode switch being in S/D, REFUEL, or START & HOT STANDBY |
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Term
| Neutron Monitoring non-coincident scram trips |
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Definition
"During initial core loading and subsequent core alterations, it may be desireable… With all (8) shorting links removed, any neutron monitor trip will cause a full scram. NOTE: APRM DOWNSCALE trip still requires the mode switch to be in RUN." |
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Term
| Requirements to reset scram logic |
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Definition
Half scram: WHEN CONDITION HAS CLEARED use scram reset logic switch (must go both ways with switch). Full scram: use scram logic reset switch (must go both ways). NOTE: in order to clear a full scram, the scram discharge volume bypass switch must be in BYPASS. In order for this to work, the MODE switch must be in SHUTDOWN or REFUEL. |
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Term
| Conditions required for blue scram light on full core display to be ON |
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Definition
| Both scram valves (CV-126 and CV-127) must be open. |
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