ML19323F655

Reactor Trip

ML19323F655
Person / Time
Site:	Oconee, Crane
Issue date:	06/22/1977
From:	Scott R DUKE POWER CO.
To:
Shared Package
ML19323F652	List: ML19323F651 ML19323F655
References
TASK-TF, TASK-TMR EP-O-A-1800-3, NUDOCS 8005290283
Download: ML19323F655 (4)

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l OCONEE NUCLEAR STATION

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l REACTOR TRIP 5

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1.0 Symptoms Channel. trip alarm on tuo or more reactor protective channels.

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I 1.2 droups 1-7, control rod "in limit" light on.

1.-3 NI's indicating a rapid decrease in neutron power.

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1.4 ICS runb'ack in progress, l

1 2.0 Immediate Action I

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I 2.1 Automatic-f Control rod groups 1-7 d:cp into the core, g

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'2.1.2 Turbine generator trips.

t Unit auxiliary load transfers to startup transformer.

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2.1.4 Turbine bypass valves open at setpoint +125 PSI.

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Feedwater runback to minimum level in OTSG's.

2.1.5 2.2 Manual iI I

Verify automatic actions occur, if not, perform manually.

2.2.1 2.2.2 Verify neutron level decreasing.

2.2.3 Close (2)(3) EP-5 (Letdown Isolation).

2.2.4 Maintain LDST level by adding water with boron concen-tration > RCS boron concentration.

2.2.5 If pressurizer level cannot be maintained due to severe shrinkage open (2X3) HP-26.

NOTE:

(2)(3) "C" HPI Pu=p can be used to maintain i

pressuri ct level if needed.

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3.0 Subsequent Action

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3.1 Notify unit supervisor and arga dispatcher -

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'w rify OTSG's controlling at' minimum level.

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E 3.3 Determine cause of trip and correct-l t

3.4 If LDST level approaches zero, open (2)(3) HP-24 to supply i j

.i.t HPI pump suction from BWST.

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l8 3.5 Go to one hoewell pump, one condensate booster pump, and one

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'feedwater pump, as required -

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0. pen (2)(3) HP-5 when pressurizer level returns to normal.

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