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31 Cards in this Set
- Front
- Back
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RWM OUT OF SEQUENCE |
More than 1 WITHDRAW ERROR More than 1 INSERT ERROR 1 INSERT ERROR and 1 WITHDRAW ERROR
OUT OF SEQUENCE results in INSERT blocks and WITHDRAW blocks on all control rods. BYPASS required (administrative controls) to restore sequence. |
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RWM Latching |
The current (latched) STEP is the lowest numbered STEP within the rod sequence that, when compared to actual control rod positions, results in the minimum number of insert errors. Once a STEP is latched, the RWM will follow control rod movement and will change STEPS in accordance with the loaded sequence.
Will not latch to the next until a control rod is withdrawn or inserted, respectively, at least one notch.
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RWM AUTOMATIC ACTIONS |
1. ABOVE LPAP (>19-22% power) RWM rod block functions are automatically bypassed but continues to provide display information (LPAP is Low Power Alarm Point) |
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RBM trips not required |
<30%, nor for peripheral rod because analysis have shown that local fuel damage due to overheating is highly unlikely during these conditions. RBM A or B can be bypassed. |
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RBM rod block setpoints: |
1) Power (use low value gate)
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If the RBM's REF APRM is Bypassed what happens? |
The reference APRM's for the RBM's are as follows:
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OPRM |
Period based algorithm- (the only one we take credit for) |
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OPRM: When the Associated APRM is bypassed |
OPRM trips do not trip the reactor, HOWEVER, the OPRM trips are still active. Unbypassing the APRM with an OPRM trip actuated will trip the reactor. |
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RBM SELECTION MATRIX |
Serves to choose the appropriate LPRM detector output signals to be evaluated by the RBM channels based on the location of the control rod selected for movement within the core.
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RBM is INOP if the LPRM's are providing an input signal of what? |
If < 50% of the LPRM's are providing input. |
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TIP SHEAR VALVES |
Provide a backup means of isolating their associated TIP guide tubes following the receipt of a Primary Containment Isolation signal. The valves each have 2 firing circuits and normally pass a trickle current for continuity. These are normally open and are located in the TIP room. These valves are manually actuated using a keyswitch from the 10C607 panel in the control room. Continuity lights are normally DEENERGIZED. |
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The SRM's scram signal? |
A scram signal at 2x 105 cps if the shorting links are removed. |
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Diesel Engine Auto Start Interlocks: |
A. 129" Rx Level.
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If a LOP and LOCA occur concurrently |
Diesel Generator will automatically restore power to the 1E switchgear. Starting of loads will be controlled by the LOCA sequencer. |
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EDGs are automatically started
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Under loss of coolant accident (LOCA) and/or loss of power (LOP) conditions. If a LOCA occurs and offsite power remains available, the generator output breaker will remain OPEN. |
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RPT Pump start sequence
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Auto OPEN signal - 3 sec stroke
Four successive 1 sec stroke with 10 sec pause in between
Total 80 sec |
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How many seals? What are the capacities?
Normal conditions?
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Two seals each rated for full Rx pressure
#1 seal at ~1000 psig
#2 seal at ~500 psig
Temperature for both seals <200 deg F |
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#1 Seal failure indication |
Higher pressure at seal #2 |
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#2 Seal failure indication |
Lower pressure at seal #2 |
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Most likely a failure at Seal #2 |
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What is an indicator of both seals failing? |
High temps in both seals due to Reactor coolant passing through the seals. |
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#1 Seal failure indication |
Higher pressure at seal #2 |
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#2 Seal failure indication |
Lower pressure at seal #2 |
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RPT Drive Motor Start Permissives: |
A. Suction Valve full open. |
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SRM,IRM and LPRM Regions/Volts: |
SRM - Proportional and 350 VDC IRM - Ion Chamber and 100 VDC LPRM - Ion Chamber and 100 VDC |
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APRM Upscale Recirc Flow Units |
Upscale (or high flow) trip - if flow reaches 111% TS rated flow. |
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The MSS is placed in S/D following a SCRAM to ensure |
To ensure the MSIVs do not go closed during a possible cooldown (<756). This ensures the main condenser remains available and protects the TORUS. |
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Comparator trip |
Indicates that 1 of the 2 flow signals being compared is higher or lower than the other flow signal by 10 % mismatch or more. |
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Failed Comparator |
Use the lowest flow value for the calculation. The compare to the initial Rx.
.57(%F) +53 = Rod Block
.57(%F) + 58 = Scram
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APRM GAF |
GAF= Actual (Heat Balance ex 3840 = 100) APRM
100 99 = 1.01 is Non Conservative |
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APRM INOP MU/SOO/TooFew |
Module Unplugged
Mode SW out of operate <14 LPRM Inputs |
