Term
RWM
Describe the purpose and function of the RWM. |
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Definition
-Enforce predetermined rod withdraw or insert sequences during operation below 20% power.
-Minimizes reactivity worth of rods being withdrawn as is the worth of each rod remaining in the core. |
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Term
RWM
Describe the design bases of the RWM. |
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Definition
-Limit rod motion such that high worth rods are not created.
-Limiting maximum reactivity increase due to control rod drop accident.
-Limits rod motion so that rods can not be withdrawn to the extent of excessive heat flus or premature criticality. |
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Term
RWM
Describe the RWM power supply. |
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Definition
-Y-70.
-Normal from 250V battery.
-Backup form MCC-134, #11 EDG. |
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Term
RWM
Describe the inputs into the NUMAC RWM. |
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Definition
-Rod position data from RPIS.
-Rod selection.
-Rod drift.
-Rod driving data from RMCS.
-Reactor power level indication from steam flow sensors. |
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Term
RWM
Describe where RWM gets its steam flow signal. |
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Definition
| Digital feedwater system. |
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Term
RWM
Describe the operate mode. |
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Definition
-Below the LPSP.
-Enforces selected sequence.
-Displays errors.
-Display/alarm rod blocks. |
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Term
RWM
Describe the test mode. |
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Definition
-Shutdown margin test.
-Special tests.
-Rod tests (all rods full in). |
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Term
RWM
Describe the bypass mode. |
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Definition
| Rod blocks and alarms are bypassed. |
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Term
RWM
Describe when get a auto display on. |
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Definition
-Any front panel key depressed.
-At 35% power (decreasing).
-Any RWM mode change.
-Any change in self-test status. |
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Term
RWM
Describe data taking during SCRAM. |
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Definition
-RWM records all drive SCRAM times.
-Triggered from RPS.
-Times recorded for 30 seconds @ 2.4 millisecond intervals. |
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Term
RWM
Describe the effects on a loss of RMCS. |
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Definition
-Enforces both insert and withdraw rod blocks.
-RWM determines that there is no control rod selected and gives the blocks. |
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Term
RWM
Describe RWM interaction w/RPIS. |
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Definition
-Scans positions every 2.4 milliseconds for SCRAM and 100 milliseconds for normal.
-Loss of RPIS will cause insert and withdraw rod blocks.
-Cannot determine current rod pattern. |
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Term
RWM
Describe the interaction with the process computer. |
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Definition
-Engineers uses to build rod sequences.
-Provides RWM status, SCRAM times, and position data to computer.
-Loss of computer has no affect on RWM. |
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Term
RWM
Describe the interaction with digital feedwater. |
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Definition
-Supplies steam flow signal the RWM uses.
-Loss of steam flow signal will cause insert and withdraw blocks.
-Cannot determine current power levels. |
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Term
RWM
Describe the effects on a loss of power to the RWM. |
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Definition
-Y-70.
-Enforces insert and withdraw blocks.
-Loss of power to RWM relays. |
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Term
RWM
Describe when the RWM is required to be operable. |
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Definition
-Whenever < or equal to 10% Rx power.
-Due to high rod worths.
-Can be bypassed if have independent operator or engineer to verify rod movements. |
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Term
RWM
Describe the low power setpoint (LPSP). |
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Definition
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Term
RWM
Describe the low power alarm point (LPAP). |
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Definition
-35% steam flow.
-RWM not useful above 35%. |
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Term
RWM
Describe the transition area. |
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Definition
-Between LPSP and LPAP.
-Allows warning and time to correct error before reaching LPSP.
-No rod blocks due to position errors but can receive hardware/software error rod blocks. |
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