ML19253A954

Operating Procedure EOP-7:station Blackout Operation

ML19253A954
Person / Time
Site:	Zion  File:ZionSolutions icon.png
Issue date:	09/10/1979
From:	COMMONWEALTH EDISON CO.
To:
Shared Package
ML19253A953	List: ML19253A952 ML19253A954 ML19253A959 ML19253A961 ML19253A964 ML19253A965
References
EOP-7, NUDOCS 7909130432
Download: ML19253A954 (13)

Text

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EDP-7 STATION BLTCCXJr OPERATION TABIE OF COmHTIS SECTICN TITLE PICE DATE REV.

Table of Contents 1

M6n 2

1.0 Purpose 2

2-9-77 0

2.0 References 2

2-9-77 0

3.0 Sympteras 2

2-9-77 0

4.0 Autm.atic ;ctions 3

2-9-77 0

5.0 Imediate 2.'anual Actions 4

7-6-79 1

6.0 Subsequent Actions 5

5 W 2

6.0 Continued 6

7-6-79 1

6.0 & 7.0 Continued 7

7-6-79 1

7.0 & 8.0 c ntinued 8

7-6-79 1

8.0 Continued 9

2-9-77 0

Condensate Storage Tank 10 2-9-77 0

Requirements, Plant at Full Power.

Condensate Storage Tank 11 2-9-77 0

Requirements, Plant at Hot Shut-dwn.

Appendix A 12 E6" 0

M*"

Saturation Te perature (T cold) 13 0

Versus Steam Generator Pressure 7 909130 '/3A) 336173 O

This procedure contains 13 pages.

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- EDP-7 Rev. 0 2-9-77 f

t ZION STATION UNIT I EMERGDCY OPERATIbG PPOCEURE EDP-7 STATION BUCKCUT OPERATION 1.0 PURPOSE

'Ittis procedure provides symptcms, autmatic actions, imediate manual actions, and subsequent operator actions for a station blackout condition.

A station blackout is an undervoltage condi': ion at two of the three 4KV buses, 142, (242), 143, (243) or 144, (244), which normally supply the 4KV ESS buses.

2.0 REFERECES_

2.1 Zion Station Final Safety Analysis Report 2.2 W Abnormal Procedure, A-6 3.0 SDPImS Irss of voltage cn any two or more of the three 4KV 3.1 buses 142, (242) 143, (243) or 144, (244) which implies loss of all external power to the station.

MG174 0

2

r i

EDP-7 Rev. 0 2-9-77 4.0 AUImATIC terIotG 0

4.1 Reactor Trip.

4.2 Turbine-generator trip.

4.3 Reactor coolant ptrrps trip.

4.4 Steam du:ip to condenser blocked (C-9 not illuminated).

4.5 Diesel generators start, are at speed and voltage within 10 seconds, and supplying their ESS bus.

4.6

'Ihe following " safe shutdown" equignent is auto-started within 30 seconds.

A.

Reactor containment fan coolers at low 4:eed.

B.

Carponent cooling pu:rps.

C.

Auxiliary feedwater prps.

D.

Service water pu:rps.

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336175 3

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EDP-7 Rev. 1 r:t 6n 5.0 DMEDIATE MANUAL ACTIOtG 5.1 Verify that the autmatic actions have occurred.

5.2 Verify all control and shutdoan rods are fully inserted by R.P.I. indicatico and rod bottm lights.

5.3 Verify reactor power decreasing and transfer NR-45 recorder to cne intermediate range and one source range.

5.4 Monitor pressurizer level.

5.5 Restart the pressurizer proportional heaters. Monitor pressurizer pressure.

O O

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I 6.0 SUBSBXTC7r ACTIONS 6.1 Announce the casualty over the page.

6.2 Initiate the Generating Station Energency Plan (GSEP) as per E.P.I.P.

6.3 Adjust the diesel generator's frequency and voltage as necessary.

6.4 Start,i charging pump to maintain pressurizer level and/or pressure (aux spray), acnitor pressurizer level and pressure, and secure charging pumps when these parameters are returned to normal.

?OTE At first indication on S/G narrow range level indicator reduce aux. feedwater flow to 50 GR4 to preclude an inadvertent safety injection due to water harr.er. Aux. feedwater ficw may be ircreased at the discretion of the Shift Supervisor.

6.5 Establish 50 to 150 GPM auxiliary feedwater ficw per steam generator and maintain prograrmed level wnen levels have been recovered.

6.6 otnitor decay heat removal by the steam generator at-ospheric reliefs and/or safety valves. Maintain the natural circulation mode of cooling as outlined in Appendix A.

heaters GN 6.7 Control pressurizer pressure by turning the r and OFF and/or by cpening and closing the pee r operated reliefs. The reliefs should be reisolated after use or if they stick open.

Przr spray valves are inoperative if the B & D loop RCP's have NOTE:

tripped.

tDTE: Aux. spray and pcwer operated reliefs will he incperative if instrument air pressure is lost.

6.8 Secure main steam to steam jet air ejectors and the acisture separator reheaters.

6.9 Align the main control board to match targets, and verify proper component operation.

FDTE: A simultaneous black-cut on both units will result in additional cc plications; those anticipated are:

1.

A loss of instrument and service air pressure with resultant repositicning of air operated valves to their fail positicns.

2.

The loss of pcwer to the fire sump pur:ps with the possibility at ficoding the 560' T.B. due to cackwashing of make-up demin roughing filters.

336177 s

_ _N, _

E0P-7 Rev. 1 6"

m 3.

Ioss of heating sysan. cire. water pturps with resultant freezing of aux. bldg. heating coils during cold weather O.

'Ib reduce the effects of these problems the follcwing steps should be taken:

1.

Advise maintenance to run a portable power cable to one service air compressor, and open the inst. air Cross-Connect.

2.

Dispatch an opcrator to close the following valves in the make-up demin. system.

560 ' T.B. CMJ-0188 (S.W. to roughing filter backwash) CMJ-185 (S.W. to raw water heat exh.) and verify closed CMJ-190 (S.W. bypass of raw water heat exch.)

3.

Drain the aux. bldg. heating coils if outside temp. is less than 32*F.

6.10 Start the following ventilation equipment:

1.

'Iwo aux. bldg. exhaust fans 2.

One aux. bldg. supply fan 3.

One train of computer & misc. room HV7C 4.

One train of control roan HVAC 6.11 Determine shutdown margin NCTIE: Narrow range R'ID's are inoperable if FCP in that loop is not running. Utilize wide range RTD's, incere ther:xcouples or steam generator pressure to determine FCS temperature 6.12

'Ihe primary water pumps are not available; therefore, make-up to the RCS will be frcm the msr. On Irw-Irw Invel in the VCT, verify that the charging pump suction shifts to the EST.

6.13 Verify that the turbine generator is in a safe shutdcun condition:

A.

Turning gear oil pump or emergency oil pump on.

B.

High pressure seal oil supplied to the generater or hydrogen pressure reduced in generator.

O Sail 78 6

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EDP-7 Rev. 1 JUL 6 79 C.

Place the turbine on the turning gear when the turbine reaches zero speed.

D.

Isolate gland sealing steam when condenser vacuum is lost.

6.14 Verify that the heat tracing, boric acid tank heaters, and boron injecticn tank heaters are energized.

6.15 Tb minimize diesel-generator loading and to conserve diesel-generator fuel, at the direction of the Shift Engineer stop curponents that are not required. Ensure the levels in diesel fuel oil tanks are checked daily (normal fuel on hand results in 7 days operation.)

7.0 Determine whether to stay at hot shutdown or cool the plant to the residual heat renoval. stem cut in paint (350 F, 400 psig).

7.1 Base the decisicn to cooldwn on the following:

A.

Excected duration of the olackout.

If restoration of power to at least one reactor coolant pump bus in not anticipated within nine hours follw ing the reactor trip, it is desirable to start cpoldown as socn as possible, to take advantage of the negative reactivity being added by the Xenon build-up.

If plant cooldown is started, make-up is frcn the RWSr.

O Since only natural recirculation is available, credit for this additional boren can not be used. Therefore, ccrrpute the shutdmn mrgin for 300*F and ensure sufficient shutdown margin is available until the plant is on RHR.

B.

The ancunt of condensate available in storace Tank.

The attached curves show the time at which a cooldcre should be started follcwing the blackout for two cases.

1.

Blackout with plant trip frcm full load.

2.

Blackout with plant at hot shutdown.

NC7FE If in the course of the ccoldwn the secondary l

storage tanks approach zero level, the S.W.

back-up feed to the aux. feed system snould be f

used to insure maintenance of the Steam Generators i

as a heat sink.

j O

336179 7

EDP-7 Rev. 1 NLt 77 7.2 If it is decided to cooldown:

A.

Monitor the nuclear instrumentation for count rate O-increases.

B.

Cooldown to 350 F by using the steam generator atmospheric relief valves. Da not exceed a cooldown rate of 100 F per hour.

CAUTION Do not allow system pressure to approach saturation for the existing R.C. system temperature.

C.

Depressurize to 400psig by using the pressurize pwer operated reliefs. Close the valves wnen 400 psig is reached.

D.

hhen on RHR ccntinue to cold shutdcwn per GOP-2.

8.0 Determining duration of blackout.

8.1 Ascertain whether the problem is a transmission system problem concerning all lines into the Zion 345KV terminal or a Zion Station 345KV Yard problem.

If the Transmission System integrity is secure or its restoration is emminent, prepare to pick up plant loads frcxn off-site source under orders of Edison Ioad Dispatcher.

8.2 If it is a system transmission problem get an estimate of the length of time required to restore power to the first line to the 345KV terminal.

8.3 If it is a Zion 345KV Yard Problem proceed as follows:

A.

Dispatch qualified personnel to the yard to verify the integrity of the 345KV system and to reccrd, clear and analyze the significance of the relaying targets.

B.

Contact the Northern Division Operational Analysis Department and the Sub-Station Construction Departments for assistance as required.

C.

After analyzing the problem, if possible, isolate it and reclose available lines to the rest of the 345KV terminal, and restore of f-site pcwer to the plant (under the D.irection of the Edison Icad Dispatcher.)

33E160 8

f WP-7 Rev.0 2-9-77 8.4 In the event that the System Aux. Transformer 142 (242) will O

not be wailable for an extended period of time, open the main disconnects, close the generator ground disconnects and have maintenance remove the disconnect between the generator and main transformer. When this has been completed, energize the Station 4kV Busses via the main transformer and the Unit Auxiliary Transformer 141 (241) under the direction of the Edison Icad Dispatcher.

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EOP-7 Rev. O Ava s n APPENDIX A VERIFICATION AND MAI!71'UECE OF NA'IURAL CIoCULATION 1.1.

Establish Natural Circulation 1.

Maintain pressurizer level at 50% or greater through the use of the charging or SI pumps.

2.

Maintain at least cne steam generator level in the narrow range through the use of aux. feedwater.

3.

!bnitor degrees of RCS subcooling (cceruter address UO918) and verify that at least 50*F of subccoling is maintained.

It is reccmnended that this address should be placed on a strip chart recorder or computer window for constant observation.

a.

Utilize pressurizer heaters to maintain the required 50 F of subecoling discussed above.

1.2 Verification of Heat Removal Via Natural Circulation 1.

Determine T cold frcxn S/G pressure using Figure i or steam tables.

If S/G pressure falls below 30 psig, T cold will not te.?ccurately determined.

O 2.

Determine T hot from the average of the ten highest incore T/C.

(Cc=puter address UO916) 3.

'Ite core dT should be less than 60 F if natural circulation has been established.

4.

Verify that steam generator pressure is follcwing RCS hot leg temperatures.

(UO916) e.g.

If UO916 is decreasing, tnen steara pressure should also be decreasing.

5.

Repeat step 1. 2.1 - 1. 2. 4 as often as necessary to accurately nonitor core status. The follcwing is a su=ary of the indications of natural circulation:

a.

UO916 (RCS hot leg temp.) constant or decreasing.

b.

Core O T is less than 60 F.

c.

Steam generator pressure is following RCS hot leg temperatures.

6.

If natural circulation has not been established, repeat step 1.1.

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