Term
| 1. Explain the purpose and function of the SBLC system. |
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Definition
| "The function of the Standby Liquid Control System is to provide a redundant, independent, and positive means of complete reactor shutdown as a backup to the Control Rod Drive System (under all conditions including cold (68 degrees F), Xe - free, all rods out). Per B.03.05-01 system function: ... When initiated, it will override moderator temperature, Doppler and void reactivity effects with no zenon present to bring the reactor from the hot operating condition to the cold shutdown condition and maintain it shutdown INDEFINITELY." |
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Term
| 2. Explain the function of the major SBLC components. |
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Definition
| "Pumps, tanks, accumulators (dampen pulsations from triplex plunger pump); squib valves" |
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Term
| 3. Derive various system flow paths by: |
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Definition
- Injection
path (once per outage), pump capacity test."
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Term
| Identify the power supplies for the major SLC components. |
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Definition
| "Tank heater: MCC 132; pump A motor, control power and spuib valve,: MCC133; pump B motor, control power and squib valve: MCC 142; heat trace: L-43" |
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Term
| Describe the functional and component relationships between the SBLC system and 480 Vac station auxiliary system |
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Definition
| " heaters, pumps, squib valves" |
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Term
| Describe the functional and component relationships between the SBLC system and Demineralized water system |
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Definition
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Term
| Describe the functional and component relationships between the SBLC system and Instrument and Service air |
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Definition
| Instrument air: bubbler; service air: sparger. |
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Term
| Describe the functional and component relationships between the SBLC system and Sparger instrumentation |
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Definition
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Term
| Describe the functional and component relationships between the SBLC system and RWCU |
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Definition
| "Upon initiation of SLC, RWCU will receive an isolation signal." |
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Term
| Describe the functional and component relationships between the SBLC system and Instrument AC and uninterruptible AC distribution system |
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Definition
| Panels Y-20 and Y-30 supply power for SLC instrumentation and Panel C-05 indication. |
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Term
| Describe the functional and component relationships between the SBLC system and Lighting Power |
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Definition
| Lighting panel L-43 supplies power for heat tracing. |
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Term
| "7. Describe SBLC system operation, controls, automatic functions, flowpaths, alarms, setpoints, and or interlocks." |
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Definition
| See electrical print… bottom line: only one pump can run at a time. |
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Term
| Predict the impact/consequences on the SBLC system of Loss of instrument and service air |
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Definition
| instrument air: bubbler level goes down; service air: sparger |
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Term
| Predict the impact/consequences on the SBLC system of Low SBLC storage tank or pump suction temperature |
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Definition
| "Per SR 3.1.7.3 BASIS: Maintaining a minimum specified room temperature is importajnt in ensuring that the boron remains in solution and does not precipitate out in the pump suction piping. On a loss of heating capability, the tank and suction piping temperatures would eventually reach room temperature." |
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Term
| Predict the impact/consequences on the SBLC system of Loss of MCC-132 |
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Definition
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Term
| Predict the impact/consequences on the SBLC system of Loss of MCC-133 |
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Definition
| subsystem A (pump and squib valve) |
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Term
| Predict the impact/consequences on the SBLC system of Loss of MCC-142 |
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Definition
| subsystem B (pump and squib valve) |
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Term
| Predict the impact/consequences on the SBLC system of Loss of demineralized water system |
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Definition
| Inability to perform operability checks and inability to provide makeup to stoarge tank. |
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Term
| 11. Explain the Design Bases for SBLC. |
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Definition
| "a. SBLC SHALL be designed to bring the reactor from full power to a cold (68 degrees F), xenon-free, shutdown assuming that none of the withdrawn control rods can be inserted. b. SBLC provides a means of inserting negative reactivity into the reactor by injection of neutron absorbing boron on the form of a liquid, sodium pentaborate (Na2-B10-O16 plus 10 H2-O). c. SBLC will be placed in operation only in the improbable event that not enough control rods can be inserted into the core to accomplish shutdown in the normal manner. d. SBLC is designed to meet the original design basis and to conform to the NRC ATWS rule. 1) The ATWS rule requires SBLC to be capable of injecting sodium pentaborate at a 13 weight % concentration of natural boron 10 enrichment, at 86 gpm into a 251 inch RPV (628,300 lbm water). 2) Monticello has a 206"" vessel (400,000 lbm water). 3) To comply with ATWS rule, a minimum enrichment of 55 atom % boron 10 is injected at a minimum of 24 gpm. 4) This requires minimum concentration of 10.7 weight % sodium pentaborate to ensure compliance with ATWS rule." |
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Term
| "With respect to RWCU and Recirc Sampling, what should happen upon manual initiation of SBLC? (In other words, what is verified in step 2 of the procedure?)" |
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Definition
| "RWCU pumps have tripped. MO-2397, MO-2398, MO-2399, CV2790, CV2791 have CLOSED." |
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Term
| "What is the design flow rate of a SBLC pump? At this rate, how long will it take to fully discharge the liquid boron solution?" |
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Definition
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Term
| What is significant about air sparging the SBLC Storage Tank? |
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Definition
| "The SBLC system will be declared inoperable whenever sparging the SBLC storage tanks because if enough air were to enter the pump suction, both pumps would be inoperable." |
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Term
| What is the name and formula for the chemical used in SBLC? |
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Definition
| Sodium pentaborate. Na2 B10 O16 plus 10 H2O. |
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Term
| "When adding chemicals to the SBLC tank, at what rate of addition ""should"" prevent accumulation on the tank floor?" |
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Definition
| Approximately 10 pounds/minute. |
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Term
| Tech Spec 3.1.7 LCO/Applicability and Conditions with less than or equal to one hour completion time |
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Definition
| Section 3.1:Reactivity Control Systems; Tech Spec 3.1.7:Standby Liquid Control (SLC); LCO 3.1.7: Two SLC subsystems shall be OPERABLE; NO 1 HOUR OR LESS ACTIONS. |
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Term
| Tech Spec 3.3.6.1 LCO/Applicability and Conditions with less than or equal to one hour completion time |
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Definition
| Section 3.3:Instrumentation; Tech Spec 3.3.6.1:Primary Containment Isolation Instrumentation; LCO 3.3.6.1: The primary containment isolation instrumentation for each Function in Table 3.3.6.1-1 shall be OPERABLE; APPLICABILITY According to Table 3.3.6.1-1: CONDITION B: One of more Functions with primary containment isolation capability not maintained; REQUIRED ACTION B.1:Restore primary containment isolation capability. COMPLETION TIME: 1 hour. Condition C: Required Action and associated Completeion Time of Condition A or B not met. REQUIRED ACTION: Enter the Condition referenced in Table 3.3.6.1-1 for the channel. COMPLETION TIME: Immediately. CONDITION F: As required by Required Action C.1 and refereneced in Table 3.3.6.1-1; REQUIRED ACTION F.1 Isolate the affected penetration flow path(s); COMPLETION TIME: 1 hour. CONDITION H: As required by Required Action C.1 and referenced in Table 3.3.6.1-1. REQUIRED ACTION(s) H.1 Declare associated SLC subsystem inoperable; COMPLETION TIME: 1 hour. __OR__ H.2: Isolate the RWCU system; COMPLETION TIME: 1 hour. CONDITION I As required by Required Action C.1 and referenced in Table 3.3.6.1-1. REQUIRED ACTIONS: I.1: Initiate action to restore channel to OPERABLE status. COMPLETION TIME: Immediately. __OR__ I.2 Initiate action to isolate the RHR Shutdown Cooling System. COMPLETION TIME: Immediately. |
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