ML20199E432

Off-Normal Operating Procedure 9408.3, Loss of Voltage to C 4,160 Volt Bus

ML20199E432
Person / Time
Site:	Turkey Point
Issue date:	08/22/1985
From:	FLORIDA POWER & LIGHT CO.
To:
Shared Package
ML20199E404	List: L-85-372, Commits to Apply Appropriate Tech Spec Requirements to Address Auxiliary Feedwater Pump Availability & Performance Monitoring.Several Items Discussed in IE Operational Readiness Insp Team 850913 Exit Meeting Resolved ML20199E398 ML20199E411 ML20199E432 ML20199E453 ML20199E461 ML20199E480 ML20199E486 ML20199E503
References
FOIA-85-729 9408.3, NUDOCS 8603270217
Download: ML20199E432 (3)

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TURKEY POINT UNITS 3 AND 4 0FF-NORMAL OPERATING PROCEDURE 9408.3 AUGUST 22. 1985 1

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1.0 Title

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LOSS OF VOLTAGE TO "C" 4160 VOLT BUS l

2.0 Approval and List of Effective Pages:

2.1 Approval :

j Change Dated 8/22/85 Reviewed by Plant Nuclear Safety Committee:

85-139 and Approved by Plant Manager - Nuclear:

~ 8/22/85 2.2 List of Effective Pages:

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Page Date Page Date Page Date

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8/22/85 2

8/22/85 3

8/22/85 i

3.0 Purpose and Discussion:

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3.1 Purpose

3 This procedure provides the actions to be taken in the event of loss of ower on either "C" 4160

• volt bus.

If a-loss of power also occurs in both p'A" and "B" 4160 volt buses, refer to E0P 20004.

If a loss of voltage occurs on either "A" or "B" 4160 volt bus, refer to ONOP 9408.1.

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3.2 Discussion

3.2.1 The loss of a "C" 4160 volt bus normally' occurs due to -protective relaying, which can be found in the"C". bus protection logic. sheet.

This procedure only covers the symptoms, immediate, automatic,.and

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2 operator actions.-

This procedure directs the operator to pertinent j

procedures for the subsequent actions of recovery.

l 3.2.2 It is important to remember that at the present time, the "C" 4160 volt bus is powered from the opposite unit's "C"

auxiliary j

transformer.

4.0 Symptoms

j 4.1 All supply'. breakers on the affected 4160 volt bus are OPEN.

4.2 No voltage indication on the affected 4160 volt. bus.

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0FF-NORMAL OPERATING PROCEDURE 9408.3, PAGE 2.

8/22/85

~ OSS OF VOLTAGE TO "C" 4160 VOLT BUS L

4.3 "B" steam generator feed pump will be off.

NOTE:

If affected unit is greater than 60% power, a governor runback should be' occurring.

i 4.4 Steam flow greater than feedwater flow alarm on at least one steam generator.

4.5 Decreasing level jn at least one steam generator.

4.6 Increasing Tavg and RCC pressure until control rods are driven in by operator action.

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4.7 Actuation of steam dump to condenser.

NOTE:

If "C" condensate pump was in service prior to loss of voltage, the i

symptoms would occur in a faster sequence and will probably result in a reactor trip.

If reactor trips, refer to ON0P 0208.1.

5.0 Instructions

l 5.1 Imediate Automatic Action:

5.1.1 Governor runback if reactor power is greater than 60"..

1 5.1.2 Actuation of steam dumps.

5.2 Immediate Operator Action:

5.2.1 Orive control rods in to maintain Tavg within 5 degrees F of Tref.

5.2.2 Reduce load until steam flow is less than or equal to feedwater flow to recover steam generator. level..

l 5.2.3 Verify operability of pressurizer PORV's if required by system pressure.

NOTE:

If the reactor trips, refer immediatel_y to ON0P 0208.1.

5.3 Subsequent Operator Actions:

l 5.3.1 As soon as the unit is in a stable, non-transient. condition, power should be restored to the "C" 4160 volt bus. To restore power to the affected "E",

"F" and "G"

Load Centers from their opposite unit busses, refer to *-0P-005.1, 4160 Volt Bus C.

To restore affected unit "C"

4KV Bus and associated load centers to their normal i

configuration, refer.to *-0P-005.1, 4160 Volt Bus C.

J 5.4 Important Equipment Supplies by "C 4160 Volt Bus:

The following is a list of equipment besides the steam generator feed pump and condensate pump fed from "C" 4160 volt. bus that could ' result in further plant problems if power is not restored as soon as possible.

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8/22/85 0FF-NORI1AL OPERATING PROCEDURE 9408.3, PAGE 3 LOSS OF VOLTAGE T0 "C" 4160 VOLT BUS i

E.4.1 "B" and "C" RCP oil lift pumps.

5.4.2 Water treatment plant (normally fed from Unit 3).

5.4.3 Polishing demineralizer hold pumps.

5.4.4 Traveling screens 5.4.5 Circulating water pump discharge f40V's.

5.4.6 Primary water pumps.

5.4.7 lStandbySteamGeneratorFeedPumpsAandBl 6.0

References:

1 l

6.1 ONOP 9408.1, Unit 3 Loss of "A" or "B" 4KV Bus.

6.2 E0P 20004, Loss of Off-site Power.

6.3 ONOP 0208.1, Shutdown Resulting from Reactor Trip or Turbine Trip.

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6.4

• -0P-005.1, 4160 Volt Bus C.

7.0 Records Required:

Normal log entries.

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