ML19317F096
| ML19317F096 | |
| Person / Time | |
|---|---|
| Site: | Oconee  |
| Issue date: | 11/14/1974 |
| From: | Thies A DUKE POWER CO. |
| To: | Moseley N NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| Shared Package | |
| ML19317F097 | List: |
| References | |
| NUDOCS 8001080786 | |
| Download: ML19317F096 (3) | |
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50-287 DESCRIPTION:
ENCLOSURES:
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Abnormal Occurrence on 11-2-74 (if 74-7) concerning reactor coolant pressure transmitter which was out of cal *ibration......
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incore detectors had not been calibrated, nor were they necessary, at the time of this incident.
The amount of quadrant power tilt introduced during the dropped rod test was known and within expected limits. Aborting the test, after the loss of computer, and returning the control rods to their normal positions reduced the tilt, as expected.
This was verified by direct observation of the power range detectors.
The safe operation of the reactor and the health and safety of the public was r.at affected by this incident.
Corrective Action:
Operations supervisors have been instructed in the measurement of quadrant power tilt, as follows:
1.
The power range detectors must be used to calculate quadrant power tilt.
2.
If one power range channel is inoperable and the computer is operable, use the computer calculation of quadrant power tilt with input from the incore detectors.
3.
If one power range channel and the computer are inoperable, the backup incore monitors shall be used in accordance with OP/0/1103/19.
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