ML19209B618
| ML19209B618 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 09/06/1979 |
| From: | METROPOLITAN EDISON CO. |
| To: | |
| References | |
| 1202-29, NUDOCS 7910100234 | |
| Download: ML19209B618 (16) | |
Text
,
1202-29 Revision 7 THREE MILE ISLAND NUCLEAR STATIONPO l
UNIT #1 EMERGENCY PROCEDURE 1202-29 PRESSURIZER SYSTEM FAILURE U \\i 1
Table of Effective Pages C0iiTROLLED wry.
Pace Date Revision Pace Date Revision Pace Date R evision 1.0 09/06/79 7
26.0 51.0 2.0 09/06/79 7
27.0 52.0 3.0 09/06/79 7
28.0 53.0 4.0 09/06/79 7
29.0 54.0 5.0 09/06/79 7
30.0 55.0 6.0 09/06/79 7
31.0 56.0
.,0 09/06/79 7
32.0 57.0 8.0 09/06/79 7
33.0 58.0 9.0 09/06/79 7
34.0 59.0 10.0 07/17/79 6
35.0 60.0 11.0 09/06/79 7
36.0 61.0 12.0 09/06/79 7
37.0 62.0 13.0 09/06/79 7
38.0 63.0 14.0 09/06/79 7
39.0 64.0 15.0 09/06/79 7
40.0 65.0 16.0 41.0 66.0 17.0 42.0 37.0 18.0 43.0 68.0 19.0 44.0 F9.0 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 74.0 25.0 50.0 75.0 Ur.it 1 Staff Reco me pproval Unit 2 Staff Reco me s pproval Approval Date Approval
/
/
i Date CognilantD'ap! Head Cogni'zant Oe' t. Head p
Unit 1 PORC Recommends Approval Unit 2 PORC R ommedd Approval k 1.' > A
?" e - I?
I\\
Date 1
Date g - Chairman cf PORC Chairmin of PORC Unit 1 Supe intendent Approval Unit 2 Superin endent Ap oval Date 9 77 Date
_40
(,/
A
~
Manager Generation Quality Assurance Approval Date l123 045 79101 00 e
1202-29 Revision 7 09/06/79 THREE MILE ISLAND NUCLEAR STATION UNIT #1 EMERGENCY PROCEDURE 1202-29 PRESSURIZER SYSTEM FAILURE SECTION A Leakina Pilot Operated (Electromatic) Relief Valve RC-RV2 29.A.1 Symptoms 1.
Relief valve discharge line temperature exceeding the U
normal 130 F.
Alarms on computer at 200'E.
2.
RC drain tank temperature / pressure above normal on the control room radioactive waste panel.
(Pressure alarm at 0
1.5-2.0 psig.) (Temperature >l10 F).
3.
RC system makeup flow above normal for the variable letdown flow and RC pump seal in leakage conditions.
4 Pressurizer heaters on an abnormal amount of the time.
5.
Abnormal decrease in Makeup Tank Level.
6.
Pressu"izer boron cor centration abnormally high compared with RCS boron concentration.
29.A.2 Immediate Actions A.
Automatic Actions 1.
None B.
Manual Actions 1.
Close the electromatic relief Block Valve, RC-V2.
29.A.3 Follow-Up Action Objective:
To ensure that appropriate plant management is aware of the isolated valve.
1.
Noti,fy duty superintendent that the electromatic relief valve is leaking and has been isolated.
1.0 1123 046
...,.. o
~s e m..%
o.
1202-29 Revision 7 09/06/79 SECTION B Inocerative Pilot Ooerated (Electromatic) Relief Valve, RC-RV2 29.B.1 Symptoms 1.
RC system pressure is above 2450 psig and RC-RV2 fails to open.
2.
RC system pressure is.below 2400 psig and valve fails to close.
3.
RC-RV2 discharge line temperature is above the 200 F alam.
(Nomal line temperature; 130 F.)
4.
The RC drain tank temperature / pressure is above nomal as indica' on the control room radioactive waste panel.
(Pressure alarm at 1.5 - 2.0 psig) (Temperature >l10 F)
U 5.
RC drain tank level increasing.
(High level alarm at 110 inches.)
6.
Decreasing pressurizer temperature.
7.
Decreasing RCS pressure.
8.
RCS approaching saturation.
NOTE 1:
The PORV position indicator lights do not provide direct status of the valve position.
The light indicates the position of the solenoid operator on the PORV. Therefore, the indicator lights might not indicate a stuck open PORV.
NOTE 2:
With a stuck open PORV, pressurizer level may not be a reliable indication of inventory conditions in the RCS.
29.B.2 Immediate Action A.
Automatic Action 2.0 1123 047
e 1202-29 Revision 7 09/06/79 1.
For a failed close RC-RV2 a.
Spray valve RC-V1 is open above 2205 psig.
b.
Reactor trip occurs at 2300 psig.
c.
Pressurizer code relief valves open at 2500 psig.
2.
For a failed open RC-RV2 a.
All pressurizer heater banks on full below 2105 psig.
b.
Reactor trips at 1800 psig.
(Poscible reactor trip on Variable-Pressure Temperature.)
c.
High pressure injection is actuated at 1500 psig.
B.
Manual Action 1.
For a failed closed RC-RV2 a.
Shift spray valve RC-V1 switch on center console to Manual and open further for additional spray flow if necessary to control pressure.
2.
For a failed open RC-RV2 a.
Close RC-V2 block valve 29.B.3 Follow-Up Action Objective:
The objective of this procedure is to conserve reactor coolant inventory.
1.
If a reactor trip has not occurred, attempt to restore the RCS to normal temperature, pressure and pressurizer I
level using makeup flow and pressurizer heaters.
3.0 1123 048
1202-29 Revision 7 09/06/79 2.
If a reactor trip has occurred follow EP 1202 4, " Reactor 0
Trip".
If 50 F subcooling cannot be maintained in the RCS, initiate high pressure injection.
3.
If high pressure injection has been initiated, follow the operating guidance for high pressure injection in EP 1202-
- 6. " Loss of Reactor Coolant / Reactor Coolant Pressure".
d a.0 1123 049
...._m
1202-29 Revision 7 09/06/79 SECTION C Leakina Code Relief Valve, RC-RVlA or RC-RVlB 29.C.1 Symptoms 1.
Code relief valve discharge line temperature (s) exceeding the computer normal of approximately 130 F.
(Computer alarms at 200 F.,')
2.
RC drain tank temperature /pressur: above normal (ambient) on the control room radioactive waste panel.
(Pressure alarms at 1.5-2.0 psig.)
(Temperature >l10 F) 3.
RC system increased makeup flow is above normal for the variable letdown flow and RC pump seal in leakage conditions.
4 Pressurizer heaters on an abnormal amount of the time.
5.
Abnormal decrease in Makeup Tank level.
6.
Pressurizer boron concentration abnormally high compared with RCS boron concentration.
29.C.2 Immediat6 Action A.
Automatic Action 1.
kone B.
Manual Action 1.
Determine RC leakage according to SP 1303-1.1,
" Daily Surveillance Checks".
29.C.3 Follow-Up Action Objective:
To make space available for the leakage, and to determine whether shutdown is required.
1.
If RC system identified leakage is in excess of Tech.
Spec. 3.1.6, 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 />.
5.0 1123 050
1202-29 Revision 7 09/06/79 2.
Assure RC drain tank pump is operating and cooler is in service.
U 3.
If RC drain tank temperature exceeds 120 F and sufficien.t liquid waste capacity is available, alternately add demin water and drain down the drain tank to recuce temperature.
6.0 1123 051
.....,.. _. ~_
1202-29 Revision 7 09/06/79 SECTION D Inoperative Code Relief Valve, RC-RV1 A or RC-RVlB 29.D.1 Symptoms 1.
Code relief valve (s) fail to open when above 2500 psig or
~
fails to close when below 2275 psig.
2.
Relief valve discharge line temperature is above the 0
U 200 F alam (nomal - 130 F), the RC drain tank temperature /
pressure is above normal (pressure alam at 1.5 - 2.0 0
psig; Temperature >l10 F) and the RC system makeup flow is above nomal for the letdown and RC pump seal in leakage.
3.
RC drain tank level increasing.
4.
Decreasing pressurizer temperature.
5.
Decreasing RCS pressure.
6.
RCS approaching saturation.
29.D.2 Immediate Action A.
Automatic Action 1.
Reactor trip from high or low system pressure.
2.
HP injection if valve fails to close.
B.
Manual Action 1.
If code valve (s) fail to open at 2500 psig place spray valve on manual at console center and open.
Verify pressurizer heaters are off at console right. Verify RC-V2 and RC-RV2 are open.
2.
If code valves fail to close, follow EP 1202-6,
" Loss of Reactor Coolant / Reactor Coolant Pressure".
7.0 1123 052
1202-29 Revision 7 09/06/79 29.D.3 Follow-Up Action Objective:
Shutdown the plant if a code safety valve is stuck shut.
1.
If valve failed to lift, proceed with cooldown.
8.0 1123 053
. -~
-. ~.. - n -
1202-29 Revision 7 09/06/79 SECTION E Inocerative Pressurizer Heaters 29.E.1 Symptoms 1.
Heater banks fail to energize or de-energize if RC pressure is at heater bank setpoint.
Bank 1 Bank 2 Bank 3 Bank 4 Bank 5
. Units ON 2135 2135 2135 2120 2105 PSIG OFF 2155 2155 2147 2140 2125 PSIG NOTE:
Banks 1, 2, and 3 are full on at 2135 psig.
2.
Pressurizer level Lo-Lo alarm at 80 inches.
(Heater cutoff) 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.
6.
High or low pressurizer temperature.
(Normal %650 F) 0 29.E.2 Immediate Action A.
Automatic Action 1.-
For energized heaters and rising pressure a.
Spray valve RC-V1 opens (red and green console jog button lights).
2.
For loss of heaters and decreasing pressure.
a.
None B.
Manual Action 1.
Place heater controller in manual control if control malfunction is suspected.
2.
For energized heaters / rising pressure, attempt to de-energize all heaters (at console right) except group 1 or 2.
9.0 I123 054
1202-29 Revision 6 07/17/79 3.
For loss of heaters / decreasing pressure, attempt to energize backup heaters from console CR.
If unsuccessful, start reducing unit load.
29.E.3 Follow-Up Action Objective:
The objective of this procedure is to maintain pressure control and to ensure cocservation of RCS inventory.
1.
For energized heaters, open herter 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-Vi spray valve in manual.
3.
For de-energized heaters, determine cause and if a minimum of one heater grotp is not operable, continue load reduction to shutdown and cooldown.
NOTE:
With no heaters, the rate of pressure reduction will be determined by heat los!.es from the pressurizer.
4.
Monitor RCS p: essure and assure the reactor trips if setpoints are reached.
5.
During the shutdown frorn 15% power, or if the reactor trips, increase makeup to stop the decrease in pressurizer level.
NOTE:
This action is to preserve the mass of hot water stored in the pressurizer which is providing the margin to saturation after loss of pressurizer heaters.
10.0 1123 055
1202-29 Revision 7 09/06/79 6.
Close RC-V3 to stop bypass flow.
Reopen RC-V3 periodically to maintain spray line temperature within 250 F of pressurizer temperature.
7.
Af ter reactor is shutdown, r.cinitor RCS cressure and saturation pressure.
If the 50 F subcooled limit is approached, increase the rate of cooldown to keep ahead of pressurizer cooldown and increase makeup to keep pressurizer level constant.
s 11.0 1123 056
1202-29 Revision 7 09/06/79 SECTION F Malfunction In Pressurizer Level Indication Or Control
- 29. F.1 Symptoms 1.
Disagreement between the console recorder level readouts of more than 12 inches.
2.
Rapid change in indicated / recorded level due to loss of compensation or loss of power or d/p cell failure or other malfunction.
29.F.2 Immediate Action A.
Automatic Action 1.
If indication fails low a.
Pressurizer heaters trip @ 80 inches, makeup valve MU-V17 opens, and RC pressure increases.
2.
If indication fails high a.
Makeup valve MU-Vi7 closes.
B.
Manual Action 1.
Take hand control of MU-V17 and select alternate transmitter (s) for indication.
2.
Verify heaters re-energize if tripped due to 80 inch low level interlock.
- 29. F. 3 Follow-Up Action Objective:
Select an operable instrument and return system parameters to no rmal.
1.
If switching level transmitters has not rectified the condition, switch to the alternate temperature detector.
12.0 1123 057
1202-29 Revision 7 09/06/79 2.
If pressurizer level recorder indication is lost, use the computer for level indication.
If computer level indication is selected be sure to select temperature compensated pressurizer level (Pt. #1720,1721 and 1722).
NOTE:
Each of these points is temperature compensated by the temperature detector opposite the one selected for control.
3.
Restore RCS pressure and temperature and pressurizer level to normal.
13.0 1123 058
-.;...s.
. tr,g,y o g hjgg
1202-29 Revision 7 09/06/79 SECTION G Pressurizer Soray Valve Failure 29.G.1 Symptoms 1.
RC-V1 spray valve fails to open when the RC system pressure is greater than 2205 psig.
2.
RC-V1 spray valve is open when the RCS system is less than 2155 psig.
29.G.2 Immediate Action A.
Automatic Action 1.
RCS pressure greater than 2300 trips the reactor.
2.
RC system pressure greater than 2450 psig activates RC-RV2 electromatic relief.
3.
RC-V1 spray valve fails open (in auto) causes a Tow pressure reactor trip in about 5 minutes even with all heaters "0N".
Failure when manua'ly opened beyond the automatic limit position causes a more rapid pressure decrease.
B.
Manual Action 1.
Control RC-V1 opening or closing in manual with jog buttons.
2.
If the spray valve has failed open, control pressure by closing the spray block valve RC-V3.
NOTE:
If the " Block" valve RC-V3 is closed, it must be periodically cycled to keep the spray line warm.
Cycle RC-V3 open as necessary to keep RC pressurizer spray 14.0 i123 059
1202-29 Revision 7 09/06/79 U
line temperature within 250 F of pressurizer temperature.
(Computer Pt. 520)
U CAUTION: Do not exceed at AT of 410 F between pressurizer temperature and reactor coolant hot leg te.nperature.
3.
Reduce rate of ICS load change to less than 1% per minute.
29.G.3 Follow-Up Action Objective:
Limit pressure transients while attempting to restore RC-V1 to operation.
l.
Continue plant operation with reduced rate of load change.
2.
Check thermal overload and molded case circuit breaker for RC-V1 (IAES MCC Unit 98).
a.
Reset thermal OL if tripped.
b.
Notify Electrical Maintenance if molded case breaker is tripped.
3.
If the spray valve can not be repaired on line, shutdown and repair.
5-1123 060
..