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)

Text

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5-FLORIDA POWER AND LIGHT COMPANY i

j. TURKEY POINT UNITS 3 AND 4 0FF-NORMAL OPERATING PROCEDURE 9408.3

AUGUST 22. 1985 1 .I

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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:

l 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 l 2.2 List of Effective Pages: t i -

Page Date Page Date Page Date

• i 1 8/22/85 2 8/22/85 3 8/22/85 i

3.0 Purpose and Discussion: ,

1 j 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. i

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 )

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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8/22/85 0FF-NORMAL OPERATING PROCEDURE 9408.3, PAGE 2 .

,, ~LOSS OF VOLTAGE TO "C" 4160 VOLT BUS 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.

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, 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 4

operator action.

i 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 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 I 5.4.5 Circulating water pump discharge f40V's.

5.4.6 Primary water pumps. 1 i

5.4.7 lStandbySteamGeneratorFeedPumpsAandBl 1 6 .0

References:

' l l

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

6 .2 E0P 20004, Loss of Off-site Power.

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

l 6.4 *-0P-005.1, 4160 Volt Bus C.

7.0 Records Required:

Normal log entries.

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