Term
IRM
Describe the amount and location of the IRMs. |
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Definition
| There are 8 IRMs located in an X pattern in the core. |
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Term
IRM
Describe the range and scale of operation of the IRMs. |
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Definition
-Range from the high end of the SRMs
7 13
(10 - 1.5x10 nv) to about 15% Rx power.
-Indicated on a scale of 0-125 (no units). |
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Term
IRM
Describe the operation of the IRMs. |
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Definition
-Argon gas filled titanium ion chamber pressurized to 1.2 ATMs or 17.7 psia.
- +150 VDC for polarizing voltage.
-90% enriched uranium oxide but one fifth the amount used in the SRMs which limits detector heating caused by the internal fission process.
-Significant number of pulses which pile up to form gross voltage proportional to neutron flux (square the signal to discount gammas). |
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Term
IRM
Describe the IRM rod blocks. |
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Definition
-IRM not full in unless IRM in bypass (RUN).
-IRM > 108/125 unless IRM in bypass.
-IRM INOP unless IRM in bypass.
-IRM < 5/125 unless IRM in RANGE 1 or IRM in bypass. |
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Term
IRM
Describe the IRM-RPS channel assignments. |
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Definition
-2 trip systems A and B.
-"A" Channels 11&13 and 12&14 and shorting links.
-"B" Channels 16&18 and 15&17 and shorting links.
-1 signal from both channel A and B will cause SCRAM. |
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Term
IRM
Describe the operation of driving the IRMs. |
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Definition
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Term
IRM
Describe the IRM alarms. |
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Definition
-IRM downscale: <5/125.
-IRM Hi: >108/125.
-IRM A or B HI HI/INOP: >120/125.
-Alarms on C-36, must be manually reset. |
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Term
IRM
Discuss IRM logic power supplies. |
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Definition
-IRM 11,12,13,14 are D-15.
-IRM 15,16,17,18 are D-25. |
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Term
IRM
Describe the IRM indication power supply. |
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Definition
| Y-20 powers the IRM indication on C-05. |
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Term
IRM
Describe the IRM motor module power supply. |
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Definition
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Term
IRM
Describe the IRM range switches. |
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Definition
-Low frequency filter (ranges 1-6), high frequency filter (ranges7-9/10).
-IRMs 13,16,17 have 10 range positions for extra attenuation, all others have 9. |
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Term
IRM
Describe what will cause the IRM INOP alarm to come in. |
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Definition
-Loss of detector voltage.
-Voltage pre-amp disconnected.
-Range switch disconnected.
-Loss of low power (+/-24VDC).
-Module unplugged.
-Switch NOT in OPERATE. |
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Term
IRM
Describe the IRM SCRAMS. |
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Definition
-High-High: Bypassed in RUN w/associated APRM not DOWNSCALE.
-INOP: Bypassed in RUN w/associated APRM not DOWNSCALE. |
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