IR 05000298/1993016
| ML20046A439 | |
| Person / Time | |
|---|---|
| Site: | Cooper  |
| Issue date: | 07/22/1993 |
| From: | NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV) |
| To: | |
| Shared Package | |
| ML20046A391 | List: |
| References | |
| 50-298-93-16, NUDOCS 9307280088 | |
| Download: ML20046A439 (2) | |
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9.2 (Closed) LER 298/92-15:
Initiation Reactor Isolations Following a Manual Scram
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i This LER documented the initiation of engineered safety features during a normal shutdown from power. On September 11, 1992, during a normal shutdown i
from power, the reactor was scrammed at 22 percent power.
During the water level drop inside the reactor associated with the scram, water level fell below the low level setpoint of 4.5 inches, causing the following systems to isolate; primary containment, reactor water cleanup, and secondary containment.
The licensee determined that the root cause of the event was an inadequate procedure for controlling the alignment of the feedwater pump and valves during a normal shutdown.of the plant.
The procedure failed to specify the alignment to be used to raise water level prior to initiating a manual scram.
The licensee's corrective actions include:
Procedure 2.1.4, " Normal Shutdown From Power," and 2.2.28.1, "Feedwater
System Operator," were revised to provide improved instructions for system alignments and operational guidance in support of a manual scram at various power levels during shutdown operations.
Training for licensed control room personnel was provided which reviewed
operating procedure revisions to provide better guidance for operator control of vessel level during a controlled plant scram / shutdown.
The inspector reviewed documentation for the completion of the corrective actions taken by the licensee.
Based on the review performed by the inspection, it appeared the licensee had taken appropriate actions to preclude repetition of this event.
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9307280088 930722-l PDR ADOCK 05000290 G
PDR i.
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l JUL 2 21993 Nebraska Public Power District-3-
bcc to DMB (IE01)
bcc distrib. by RIV
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J. L. Milhoan Resident Inspector Section Chief (DRP/C)
Lisa Shea, RM/ALF, MS: MNBB 4503 MIS System DRSS-FIPS
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Section Chief (DRP/TSS)
Project Engineer (DRP/C)
RIV File Senior Resident Inspector - River Bend Senior Resident Inspector - Fort Calhoun
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