ML20028E105
| ML20028E105 | |
| Person / Time | |
|---|---|
| Site: | Saint Lucie  |
| Issue date: | 01/10/1983 |
| From: | Ubrig R, Robert E. Uhrig FLORIDA POWER & LIGHT CO. |
| To: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| References | |
| 10CFR-050.55E, 10CFR-50.55E, L-83-13, NUDOCS 8301200350 | |
| Download: ML20028E105 (2) | |
Text
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P. O. BOX 14000, JUNO BE ACH, F L 33108 FLORIDA POWER & LIGHT COMPANY January 10, 1983 3J/"I7 ajj 2 2 L-83-13 Mr. James P. O'Reilly Regional Administrator, Region II U. S. Nuclear Regulatory Commission 101 Marietta Street, Suite 300 Atlanta, Georgia 30303 Re:
RII:JP0 Docket No. 50-389, 10 CFR 50.55(e),82-026 Charging Pump 2C Will Not Start on Low Pressurizer Level
Dear Mr. O'Reilly:
On December 8,1982, Florida Power & Light Company notified NRC Region II of a potential 10 CFR 50.55(e) condition existing at the site involving charging pump 2C.
The three charging pumps 2A, 2B, and 2C are powered from the emergency 480V power buses 2A2, 2B2, and 2AB respectively.
During a normal reactor operation one pump is continuously running a manual control mode, one starts and stops automatically depending on the pressurizer level and one pump is not running.
During a test examination it was found that the charging pump 2C would not start on a pressurizer low level signal when the pump was in the automatic mode, due to the wrong connection of the 125V DC power supply to the isola-tion device.
An examination of the Contis1 Wiring Diagrams revealed that the 125V DC pcwer was fed througt the pressurizer level controller contacts, which are open in the auto start condition, causing power interruption to the isolation device.
As a corrective measure, the appropriate Control Wiring Diagram was revised to correct the 125V DC connection to the isolation device and the control wiring for the charging pump 2C was changed accordingly.
Following the implementation of this modification, the pump is starting and stopping in the automatic mode as required by the pressurizer level instrumentation.
Our safety evaluation determined that a design deficiency existed, which if left uncorrected could affect only the normal reactor operation.
It would however not affect the safe reactor shutdown, for the following reasons:
a - Charging Pump 2C would start and run on SI AS, when required.
b - Charging Pump 2C would operate in manual control mode.
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Page 2 RII:JP0 Docket No. 50-389, 10 CFR 50.55(e),82-026 Charging Pump 2C Will Not Start on Low Pressurizer Level c - The pressurizer level control circuit itself is not Class 1E and actuates the pump in the automatic mode of operation through the isolation device. Above items a and b were not affected by the drawing error described above. Thereforc, the capability to safely operate or shutdown the plant was not affected. We deem this incident to be non-reportable under 10 CFR 50.55(e).
With the above mentioned corrective actions, this response closes out this item with respect to the reporting requirements of 10 CFR 50.55(e).
All l
pertinent documentation will be maintained at the site.
Very truly yours, Robert E. Uhrig Vice President Advanced Systems & Technology REU/JG/ cab cc:
Director of Inspection and Enforcement U. S. Nuclear Regulatory Commission Washington, D.C. 20555