Term
| Explain the purpose and function of the SRM system. |
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Definition
| To indicate and record neutron flux from subcritical to an intermediate flux level (1x10-1 to 1x106 cps). |
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Term
| "Identify the Normal, Alternate, and or Emergency power supplies for major SRM system components." |
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Definition
SRMs are powered from the 24/28 Vdc system. Channels 21 and 22 are from panel D-15, Channels 23 and 24 from D-25; Y-20 supplies power to the detector drive control relays; Lighting Panel L-38 provides power to the detector drive motors."
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Term
| Functional and component relationships between the SRM and ± 24 Vdc battery system |
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Definition
SRM 21 and 22 receive power from D-15 and SRM 23 and 24 receive power from D-25. |
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Term
| Functional and component relationships between the SRM and 120 V instrument AC system |
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Definition
Detector drive control relays receive power Y-20. |
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Term
| Functional and component relationships between the SRM and 208 Volt lighting panel L-38 |
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Definition
| Detector drive motors receive power from 208 Volt Lighting panel L-38 |
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Term
| Functional and component relationships between the SRM and IRM system |
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Definition
| "On range 3 or above on the IRM channels, the DETECTOR RETRACT PERMIT and DOWNSCALE rod blocks are bypassed. Above range 7 on the IRM channels or MODE switch in RUN, all rod blocks initiated by SRM channels are bypassed." |
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Term
| Functional and component relationships between the SRM and Reactor manual control system (RMCS) |
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Definition
| SRM instruments send rod block to RMCS. SRM 21 and 22 trip RMCS channel A and SRM 23 and 24 trip RMCS channel B. |
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Term
| Functional and component relationships between the SRM and Reactor protection system (RPS) |
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Definition
| "SRM contacts in the RPS circuits are normally bypassed. With shorting links removed, SRMs 21, 22, 23 or 24 will trip RPS channels A and B. With the links removed, any ONE SRM High-high trip will cause a full scram." |
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Term
| Functional and component relationships between the SRM and Reactor vessel |
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Definition
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Term
| SRM High setpoint (per the TRM) |
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Definition
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Term
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Definition
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Term
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Definition
Low detector voltage SRM module unplugged from chassis SRM Operate switch out of 'Operate' Loss of 24 Vdc
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Term
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Definition
| Rod block if channel drops to less than or equal to 5 cps (automatically bypassed when IRM range switches are range 3 or above) |
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Term
| SRM 'Detector Retract Not Permitted' |
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Definition
Rod block if any SRM channel is <100 cps and detector not fully insterted. NOTE: WILL NOT prevent inserting or withdrawing SRM detectors. But WILL prevent rod withdrawal. Bypassed when IRM range switch on range 3 or greater. |
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Term
| Impact/consequences SRM stuck detector drive |
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Definition
| "If the SRM is stuck, it may accumulate excessive amounts of exposure, which leads in turn to high dose rates when the detector is changed out. This will be true even if a long time (years) elapses between the exposure accumulation and the changeout. Therefore, it is important to be able to determine the accumulated exposure." |
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Term
| Explain the Design Bases for the SRM system. |
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Definition
Provide a minimum signal to noise ratio of 3:1 and a minimum count rate of 3 cps with all control rods inserted prior to initial power operation (includes contribution of neutron-emitting sources). Show a measureable increase in output signal (10%) from at least one detector before the reactor period is less than 20 seconds during the worst physically possible startup control rod withdrawal condition. Provide for signal overlap with the IRM signal when fully inserted.
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Term
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Definition
| Drive in ONLY; but must press (drive-in) button again to reset seal-in when full in in order to drive out. |
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Term
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Definition
12 sec on any SRM period meter. Bypassed when MODE switch is in 'run'. NOTE: Receipt of this alarm is anticipated when inserting SRM detectors into core. |
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Term
| TS 3.3.1.2 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 3.3.1.2: Source Range Monitor (SRM) Instrumentation. LCO 3.3.2.1: The SRM instrumentation in Table 3.3.1.2-1 shall be OPERABLE. |
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Term
| "TRM 3.3.2.1 LCO/Applicability and Conditions with less than or equal to one hour completion time(NOTE: no "less than or equal to 1 hour" Completion times apply to SRMs )" |
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Definition
"Section 3.3: Instrumentation. TRM 3.3.2.1: Control Rod Block Instrumentation. TLCO 3.3.2.1: The control rod block instrumentation for each Function in Table 3.3.2.1-1 shall be OPERABLE. CONDITION B: --NOTE-- Only applicable to Functions 1,2 and 3 (SRMs, IRM, and APRMs). One or more functions with two required channels inoperable. REQUIRED ACTION B.1: Place channel in the tripped condition OR B.2 Suspend control rod withdrawal. BOTH COMPLETION TIMES: IMMEDIATELY. CONDITION C: One or more required functions with 4 channels inoperable. REQUIRED ACTION C.1 Place channel in the tripped condition. OR C.2 Suspend control rod withdrawal. BOTH COMPLETION TIMES are IMMEDIATELY." |
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Term
| Function of SRM Detector Drive system |
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Definition
| Allows SRM detectors to be vertically positioned from 2 feet above the core centerline to 2 feet below the core. Drive speed: 3 feet per minute. Total stroke length: 10 feet. |
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Term
| Function of SRM Detectors |
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Definition
| Generate a signal proportional to the neutron flux levels at 4 core locations. |
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Term
| Function of SRM Pulse Pre-Amplifier |
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Definition
| Amplifies pulse from detector |
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Term
| Function of SRM Pulse Height Discriminator |
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Definition
| Passes neutron events and filters gamma events (neutron events create bigger pulses, the discriminator only passes pulses of a certain height) |
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Term
| Function of SRM Logarithmic Integrator |
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Definition
| Converts neutron pulses to an analog signal |
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Term
| Function of SRM DC Amplifier |
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Definition
| Also known as Logarithmic Count Rate Amp. Converts analog neutron signals to proper voltage for meters. |
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Term
| "Per Tech Spec 3.3.1.2, how many SRM channels are required in Modes 2, 3&4, and 5?" |
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Definition
('Technically', this is APPLICABILITY for Tech Spec 3.3.1.2). Mode 2: 3; Modes 3 and 4: 2; Mode 5: 2 |
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Term
| Per B.05.01.01-05, when are SRM functional checks required? |
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Definition
Once every 7 days in MODE 5 Once every 31 days in MODES 2, 3, or 4 When deemed necessary for proper operation
NOTE: Only one SRM tested at a time. |
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