ML20085A571

Rev 0 to Plant Emergency Procedure EP 1202-29, Pressurizer Sys Failure

ML20085A571
Person / Time
Site:	Crane
Issue date:	10/18/1973
From:	Colitz J GENERAL PUBLIC UTILITIES CORP.
To:
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THREE MILE ISLAND NUCLEAR STATION UNIT #1 DERGINCY PROCEDURE #1202-29 h[gg!ThfffG2DW Pressurizer System Failure R'M Table of Effcetive Pages Page Date Revision Pm Date D.evision Page Date Revisiotl 1.0 1

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THREE MILE ISLAND NUCLEAR STATION - Unit I Plant Emergency Procedures EP 1202 - 29 Pressurizer System Failure

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SECTION A Leaking Pilot Operated (electromatic) Relief Valve RC-RV2 29.A.1 Symotoms 1.

Relief valve discharge line temperature exceeding the normal 120 F.

Alarms'on computer at 200 F.

2.

RC drain tank temperature / pressure above normal on the control room radioactive waste panel.

(pressure alarm at 1.S-2.0'psig.)

3.

RC system makeup flow above normal for the variable let down flow and RC pump seal in leakage conditions.

29.A.2 Immediate Actions A.

Automatic Actio'ns 1.

None B.

Manual Actions 2

1.

Close the electromatic relief BLOCK valve, RC-V2 29.A.3 Follow-uo Action 1.

Repair during next shutdown SECTION B, Inoperative Pilot Operated (electromatic) Relief Valve, RC-RV2 29.B.1 Sympt 6ms 1.

RC System pressure is above 2255 psig and RC-RV2 fails to open 2.

RC System pressure is below 2205 psig and valve fails to close.

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29.B.1 Symotoms (Cont'd) 3.

RC-RV2 discharge line temperature is above the 200 F alarm.

The RC drain tank temperature / pressure is above ' ambient as indicated on the control room radioactive waste paneli 29.B.2 I= mediate Action A.

Automatic Action 1.

For a' failed closed RC-RV2:

a.

Spray valve RC-V1 is open above 2205 psig b.

Reactor trip occurs at ? s55 p-ig Pressurizer code relief valves open at 2435 psig c.

l 2.

For a' failed open RC-RV-2:

All pressurizer heater banks on full belek 2105 psig a.

b.

Reactor: trips at 1800 psig v

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High Pressure Injection is actuited. at 15 0 psig c.

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B.

Manual Action 1.

For a fsiled closed RC-RV2:

Shift spray valve RC-V1 switch on center console to MANUAL and open,frther for additional spray flow.

2.

For a failed open RC-RV2:

closa RC-V2 block valve 29.B.3 Follow-un Action

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1.

Retunn system pressure and/:emperature to normal.

SECTION C, Leaking Code Relief Valve, RC-RVIA r, RC-RVIB,.

29.C.1 Symotons 1.

Code relief valve discharge line temperature (s) exceeding the computer normal 120 T. (Computer alarms at 200 T) 3

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.EP 1202-29 10-18-73 Rsvisien 0 29.C.1 Symotoms (cont'd) 2.

RC drain tank temperature / pressure above normal (ambient) on the control roon radioactive Waste Panel.

(Pressure alarms at 1.5-2.0 psig) 3.

RC System increased makeup flow is above norma'l for the

~ variable letdown flow (45-140 gpm) and' RC pump seal in leakage conditions.

29.C.2 Immediate Action A.

Automatic Action 1.

None B.

Manual Action 1.

Determine RC leakage according to'OP 1303-1.1 (daily surveillance checks) 29.C.3 Follow-uo Action l.

If RC system identified leakage is in excess of 10 gpm, the reactor' plant must be shutdown within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />.

SECTION D. Inocerative Code Relief valve. RC-RVIA or RC-RVIB v

29.D.1 Symptoms l

1.

Code relief valve (s) fail,to open when above 2435 psig l

or fails to close.when beicw 2285 psig.

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2.

Turbine trip or gross power run back has occurred with the possibility that the spray and electromatic relief valves fail to open.

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• EP-1202-29 10-18-73 Revision 0 29.D.1 Symotoms (cont'd) 3.

Relief valve discharge line temperature is above the 200 F alarm, the RC drain tank temperature / pressure is above ambient and the RC System makeup flow is,above normal for the let'down (45-140gpm) and RC pump seal in leakage (approximately 5gpm) 29.D.2 Immediate Action A.

Automatic Action

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1.

Reactor trip from high or low system pressure..

2.

H.P. Injection if valve fails to close.

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B.

Manual Action 1.

If code valve (s) fail to open at 2435 psig place spray -

valve on MANUAL at consolo center and*open.

Verify pressurizer heatars are Orr at console right.

2.

If cc31e valves fail to close, turn all heaters ON at console right and isolate let down flow at console center by closing HU-V3.

3.

Manually initiate H.P. Injection if required to maintain pressurizer level.

29.D.3 Follow-up Action 1.

Hold pressurizer level if possible at or greater than 220 inches with H.P. Injection and begin cooldown.

2.

If valve failed to lift, proceed with cooldown.

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Rsvision 0 SECTION E, Inoperative Pressurizer Heaters 29.E-1 Symptoms 1.

Heater banks fall to energize or de-energize if RC pressure is at heater bank setpoint.

Bank 1 Bank 2 Bank 3 Bank 4 Bank 5 ON <2155

<2155, 2155 21.2(

2105 OTT 2155

' 2155 2147 2140 2125 NOTE:

Banks 1, 2 & 3 are full on at 2135 psig 2.

Pressurizer level Lo-Lo alarm at 80 inches.

3.

Pressurizer heater power supply ground alarm 4.

Abnormal console indicating lights for the heating groups.

5.

High 2255 psig or low 2055 psig pressure alarms.

29.E32 Immediate Action A.

Automatic Action 1.

For energized heaters and rising pressure:

Spray valve RC-V1 opens (red and green console jog button lights) 2.

For loss of heaters and decreasing pressure:

None B.

Manual Action 1.

Place heater controller in MANUAL control if control malfunction is suspected.

2.

?or energized heaters /rlsing pressure, attempt to de-energize all heaters (at console right) except group 1 or 2 3.

For loss of heatees/ decreasing pressure, attempt to energize If ' nsuccegsfu1 start Backup heaters from console, CL.

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reducing unit load.

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29.E.3 Follow-up Action 1.

For energized heaters, open heater breakers in question at the pressurizer Heater Control Centers except for group 1 or 2.

2.

Control RC pressure at normal 2155 psig setpoint with RC-V1 spray valve in MANUAL.

3.

For de-energized heaters, determine cause and if a minimum of one heater group is not operable, continue load reduction to shut down and possibly cooldown ond'ition.

SECTION T Malfunction In Pressurizer Level Indication or Control 29F.1 Symotoms 1.

Disugreement between the console recorder level readouts of more than 12 inches.

2.

Rapid change in indicated / recorded levei due to loss of com-pensation or loss of power or d/p cell failure or other mal-function.

29P.2 Immediate Action A.

Automatic Action 1.-

If indication fails low:

Pressurizer heaters trip @ 80 inches makeup valve MU-V17 opens, and RC pressure increases.

2.

If indication fails high:

Makeup valve MU-V17 closes.

B.

Manual Action 1.

When any two of three console recorder level transmitter readouts disagree by more than 12 inches, take manual 6.0 1116Z

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4 control of level and then select the third transmitter for i

indication.

2.

Re-energize heaters if tripped due to malfunction, i

29.T.3 Follow-up Action 1.

If the switching level transmit'ters ha's not rectified the condition, switch to the alternate temperature detector.

l 2.

If pressurizer level recorder. indication is lost, select another transmitter or use the computer for level indication.

SECTION G Pressurizer Spray Valve Failure 29G.1 Symptoms

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1.

RC-V1 spray valve fails to open when the RC system pressure is

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greater than 2205 psig.

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2.

RC-V1 spray spray valve is open when the RC ' system is less than 2155 psig.

29G.2 Immedicte Action A.

Automatic Action 1.

RC system pressure greater tlan 2715 psig. activates RC-RV2 electromatic relief and the high pressure alarm.

i 2.

RC-V1 failing open (in auto) causes RC system prassure to stablize at approximately 2100 psig. with all heaters "on".

t 3.

Failure when manually opened beyond the automatic limit position causes continued pressure drop and alarm at 2055.

B.

Manual Action 1.

Control RX-V1 opening or closing in MANUAL with jogbuttons.

2.

If the spray valve gas failed open, control pressure by i

closing the spray block valve RC-V3.

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NOTE: If the " Block" valve RC-V3 is closed, it must be 1

periodically cycled to keep the spray line warm 3.

Reduce rate of ICS load change to less than 1% per minute.

29G.3 Follow-up Action 1.

Continue plant,cperation with reduced rate of load change.

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