ML19209B605

Emergency Procedure 1202-3,Revision 9, Turbine Trip.

ML19209B605
Person / Time
Site:	Three Mile Island
Issue date:	09/12/1979
From:	METROPOLITAN EDISON CO.
To:
References
1202-3, NUDOCS 7910100213
Download: ML19209B605 (5)

Text

1202-3 Revision 9 09/12/79 THREE MILE ISLAND NUCLEAR STATION CONTROLLED UNIT #1 EMERGENCY PROCEDURE 1202-3

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boe Date Revision Pace Date Revision Pace Date, Revision 1.0 09/12/79 9 26.0 51.0 2.0 09/12/79 9 27.0 52.0 3.0 09/12/79 9 28.0 53.0 4.0 07/07/79 8 29.0 54.0 5.0 30.0 55.0 6.0 31.0 56.0 7.0 32.0 57.0 8.0 33.0 58.0 9.0 34.0 59.0 10.0 35.0 60.0 11.0 36.0 61.0 12.0 37.0 62.0 13.0 38.0 63.0 14.0 39.0 64.0 15.0 40.0 65.0 16.0 41.0 66.0 17.0 42.0 67.0 18.0 43.0 68.0 19.0 44.0 69.0 20.0 45.0 70.0 21.0 46.0 71.0 22.0 47.0 72.0 23.0 48.0 73.0 24.0 49.0 '

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- 1202-3 Revision 9 09/12/79 THREE MILE ISLAND NUCLEAR STATION UNIT 1 EMERGENCY PROCEDURE #1202-3 TURBINE TRIP 3.1 SYMPTOMS

1. ICS in the tracking mode.

2. Turbine stop and combined intemediate valves clcted.

3. Generator breakers open and megawatts electric zero.

4. Reactor trip (if initial reactor power >20%).

5. Any one of the following turbine trips:

a. Generator fault.

b. Reactor trip

c. Both feed pumps tripped

d. Moisture separator level hich

e. Vacuum <23" HG

f. Vibration 8 mills on Bearings 1, 2, 9,10, ll,12 Vibration 10 mills on Bearings 3,4,5,6,7,8

g. Loss of both turbine speed signals

h. Over speed RPM >108%

i. Backup over speed RPM >l12%

j. Hydraulic press <1100 PSI

k. Thrust bearing failure or bearing oil <15 PSI

1. EHC loss of d.c. power

m. Shaft oil pump <105 PSI at >l300 RPM

n. Loss of Stator Cooling and load not <25% after 3.5 min,

o. 2 of 3 exhaust hoods >225 F.

1.0 112.5 010

1202-3 Revision 9 09/12/79

p. Manual actuation of main turbine and generator bearing deluge system.

3.2 IMMEDIATE ACTION A. Automatic Action

1. Reactor trip (if initial reactor power >20%).

2. Turbine stop and combined intermediate-valves close, and generator breakers open.

3. Turbine bypass valves or atmospheric relief open to control 1010 PSI steam generator pressure.

NOTE: The Atmospheric Relief Valves will also open if steam generator pressure reaches 1027 PSI.

4. hoisture separator drain tank pumps trip.

, 5. ICS trips to track and runs back at 20%/ min., or, if the turbine trip is from loss of feedwater pumps, the run back is 50%/ min.

6. If both the r_. feed pumps have tripped, the steam drivea and motor driven emergency feed pumps will start.

7. The feed demand will control 0.T.S.G. at minimum level (30").

8. The Turbine Motor Suction Oil Pump, Bearing Oil Lift Pumps and Turning Gear Oil Pump will start as turbine speed decays.

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1202-3 Revision 9 09/12/79 B. Manual Action NOTE: As asterisk (*) indicates that the parameter value must be reverified as the first step in the follow-up action. Use redundant indication where possible.

1. If a reactor trip has occurred, follow the Immediate Manual %ction of EP 1202-4, " Reactor Trip".

2. Verify that the Turbine Stop Valves are closed,

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generator breakers and field breakers are open'.

Start the A.C. Motor Suction Pump, the Turning Gear Oil Pump, the Bearing Lift Pumps, and close turbine extraction steam valves as follows:

4 Stage EXV1A/B 6 Stage EXV4A/B 8 Stage EXV5A/B/C 10 Stage EXV6A/B/C/D A

3. If any feedwater stations are in hand, total feed-water should be reduced manually to keep steem generator level at 40"(*) on the startup range.

3.3 FOLLOW-UP ACTION Objective:

The objective of this procedure is to conserve RCS inventory to offset shrink, ensure the core is 1% shutdown, remove decay heat thru the steam generators and arrive at a stable hot shutdown condition.

1. Reverify the parameters marked with an asterisk (*) are in the required range. Use redundant instrumentation if available.

3.0 11?7lc; 0}c1 J

- 1202-3 Revision 8 07/07/79

2. Verify that turbine bypass valves (or, if vacuum is lost in main condenser, atmospheric reliefs) are controllirg steam generator pressure at 1010 PSI.

3. If turbine trip is due to loss of both feed pumps, verify emergency feed pumps started and delivering water to the 0.T.S.G.'s thru EF-V-30A/B.

4. Verify that the feed heater water levels are below the high level alarm point and open all extraction steam valves that v?ere c'esed_in step 1 of manual action.

5. Check 6th Stage Heater Drain Tank Level.

Stop Heater Drain Pumps if level is low, d

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