Term
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Definition
| Processes inputs from field contacts to annunciate alarm conditions displayed on the overhead alarm windows and the annunciator CRT. |
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Term
| Name the 3 Major subsystems of the OHA. |
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Definition
12 Scanners 64 points of data scanning every 1ms.
2 SERs (Sequence Event Recorders):
1 Primary 1 Backup. If swapped to Backup SER, 30 second delay incurred.
22 DACs (Distributed Annunciator Controllers): 2 per Lighted OHA windows
1 primary 1 Backup |
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Term
| Which power supplies feed the OHA? |
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Definition
21 and 24 MAC (Mis. AC)
Feed: SER Main chasis, SER Expansion chasis, Field contact power supplies.
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Term
| State the purpose of the AVS (Annunciator Verication System) |
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Definition
| Installed to automatically check the OHA for operation. verifies alarm processing from the scanner, through the SER, through the parallel even and odd DACs, which drive the alarm windows |
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Term
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Definition
Non-Safety Related System that:
Records, on a printer, the sequence in which remote contacts open and close. The AAS records the time of day the contacts change state and whether or not it was abnormal or normal state. |
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Term
| Which Power supplies feed the AAS? |
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Definition
Primary: 24 MAC
Backup: 22 MAC |
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Term
| Name 2 Tech Spec related Data Points collected by the AAS. |
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Definition
AFD 3.2.1
Recorder displays the auctioneered High Flux Diff and the target bands associated
RCS Leakage 3.4.7.2
RCS Leakage must be demonstrated within limits. AAS monitors Containment Sump Pump Start |
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