ML19294A769
| ML19294A769 | |
| Person / Time | |
|---|---|
| Site: | Farley  |
| Issue date: | 10/16/1978 |
| From: | Barton A ALABAMA POWER CO. |
| To: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| References | |
| 78-218, NUDOCS 7903220111 | |
| Download: ML19294A769 (5) | |
Text
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.-N""2 October 16, 1978 Joseph M. Farley Nuclear Plant - Unit 2 Diesel Generators 1C and 1-2A File:
A-35.62.50 Log:
7S-218 Mr. James P. O'Reilly U. S. Nuclear Regulatory Cc=::ission 230 Peachtree Street %' - Suite 1217 Atlanta, Georgia 30303
Dear Mr. O'Reilly:
Please find enclosed the corrective action to the extension to the diesel generator problem concerning the river water pu=ps as scheduled in the previous report dated August 15, 1978, in accordance with the NRC regulation 10CFR50.55(e). This problem identified does not affect current Unit 1 operation; however, final design changes to resolve the subject problem will be reviewed for possible impact on Unit 1.
This corrective action will be implemented prior to the issuarte of the Unit 2 Operating License.
Very truly yours, T%
Alan R. Barton ARS:CBBh Attachment cc +
Attachment:
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JOSEPH M. FARLEY NUCLEAR PLANT UNIT 2 REPORT OF CDP.RECTIVE ACTION FOR DIESEL GENERATOR PROBLEM CONCERNING POWER TO RIVER WATER PU"PS DURING OPERATION OF BOTH FARLEY UNITS It was reported that af ter the two units go into operation, only one, emergency power source (diesel generator 2C-Train B) was dedicated to the River Water System, hence only 4 river water pumps wi th automa tic capability would be available. The failure of diesel generator 2C could leave the plants with no river water pumps available. This devia tes from our comitment in the FSAP and does not meet the minimum River Water System availability requirements for safe shutdown of both units.
In order for the Farley Nuclear Plant to meet the FSAR comitments of the loss-of-pond dam, loss-of-offsite power (LOSP), and a single failure when Unit 1 and Unit 2 are in operation the following changes to the logic, scheratic, and wiring concerning the diesel generator are proposed (see Figures 1 and 2):
(a) Af ter the sequencer has added the LOSP loads to Bus IF, the 4 KV Bus IF will furnish power to the 4 KV Bus lti.
Three Unit 1 Train A river water pumps (Numbers 8, 9, and 10) will be started on Bus lH in sequence.
(b) The LOSP sequencer on Bus 2F will be modified to eliminate containment cooler 2B from being added automatically. As i n th e pa s t,
containment cooler 2A will be automatically applied to Bus 2F. Af ter LOSP sequencer has added LOSP loads to Bus 2F, the river water pumps sequencar on Bus 2H will be unblocked to enable one river water pump (Number 6) to automatically be applyed to Bus 2H.
(c) Should diesel generator 2C fail, diesel generator 1B will furnish power to Bus lJ and diesel generator 2B will furnish power to Bus 2J af ter the sequencers on Buses 1G and 2G have had LOSP loads added. Two river water pumps (Numbers 4 and 5) will start on Bus IJ and two river water punps (Numbers 1 and 2) will start on Bus 2J.
(d) The existing feature of the diesel generator 2C working like a backup for diesel generator IB or 2B if either fails to furnish power to the hot shutdown load will be removed. This feature is not required to meet single failure criteria.
In the dasion event discussed, the river water sys tem will be auto-natically diverted to the pond wet pit which supplies suction to the service Additional stop logs will be added to the pond wet pit to water pumps.
ensure that adequate wet pit level is maintained.
The above changes will ensure that the plant has adequate river t'3ter supply with both units operating.
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