ML20024C663
| ML20024C663 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 01/25/1973 |
| From: | GENERAL PUBLIC UTILITIES CORP. |
| To: | |
| References | |
| TASK-02, TASK-07, TASK-2, TASK-7, TASK-GB GPU-2165, NUDOCS 8307120936 | |
| Download: ML20024C663 (15) | |
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100 200 300 140 0 Indicated Uncompensated Pressurizer f.evel, incties i
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B 45C3
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6Pu z.tG F OyR ITNIT #1 PRESSURIZER A3 NORMAL OP22ATIONS OF 1202 29 1.
PURPOSE' i
To provide procedures for the following abnormal conditions:
Title Section Leaking or Inoperative Pilot Operated k
Relief Valve Leaking Code Relief Yalve 5
Inoperative Hester or Heater Bank 6
l Malfunction In Level Indication or Control 7
Insufficient Spray Valve Bypass Flow 8
Spray Valve 'r'ailure 9
2.
DESCRI*fION 2.1 The principal response to a leaking pilot operated relief valve is to close the isolation valve and repair at the next outage.
- 2.2 The principal response to a leaking code relief valve is to determine the leakage rate and verify that continued operation is pernissible.
2.3
"'he principal response to an inoperative heater is t,o locate the fault and de-energise the affected heater.
2.k The principal response to a malfunction in level control depends on its magnitude.
If a discrepancy in level indication exists which does not cw. W sg safety, the malfunctioning component may be recalibrated or replaced and operation continued.
If a discrepancy exists which compromises safety, the plant must be shut down.
(TS) 2 5 The principal resynee to insufficient bypass spray flow is to==miany throttle the main spray valve er to spray intermittently to maintain spray line desperature vitain u=its.
B 4491 s
Rev.
2 1202 29 Date:
12/15/72
, 2.6 The principal response to an inoperative spray valve depends on the failure.
If the valve has failed open, close the block valve. If the valve fails closed, naneuver with caution.
3.
LIMITS A3D PR"M ONS 3.1 Pressurizer heater capacity of at least 126 KW should be operable during reactor operation.
3.2 "he intermediate position limit switch (auto spray setting of ko$) for the spray valve is overridden when in manual control.
3.3 Complete loss of pressurizer level indication requires i= mediate reactor shutdown.
3.k The pressuriser spray block valve cannot be, jogged. It vill open or close coupletely when a control signal is initiated.
(TS) 3.5 The ="- aT between spray fluid and the pressurizer is h30 F.
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Rev.
2 12C2 29 42/45/72 Date: ~"
B 4492
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LIAm3 CR iso 3T3.A"'IVI FILOT 0?I'.A"E PEIIT VA1TT k.1 Sym;rtans
- t.
Relief valve discharge line temperature alarm (200 F).
2.
Excessive makeup flow.
'3.' High quench tank temperstw o.
- k.
Increasing quench tank level k.2 Probable cause 1.
Leakage may be caused by failure of valve to resent properly or'a damaged seat. Failure to operate any be caused by loss of the pilot actuator power supply, binding of the valve or actuator or failure of the pilot actuator.
h.3 Immediate Action 1.
Close the relief valve block valve if leakage is greater than that allowed by Technical Specifications. (No immediate action is required if the valve fails to open.)
k.k Follovup Action g
1.
Repair at the next shutdown.
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4 B 4493 Rev.
2 1202 29 Date:
12/1dM2
.h.
S.
5 LIucNo ccor Pr!!? VALVE 51 Symptoms 1.
Relief valve discharge line temperature alarm (200 F).
2.
Excessive makeup flow.
- 3.
High quench tank temperature.
- k.
Increasing quench tank level.
5.2 Probable cause 1.
Yalve leakage may be caused by failure to seat properly or a damaged seat.
This procedure addresses itself to those leaks within *dmits of Technical Specifications. For larger leaks, refer to OP 1202 26, Loss of Reactor coolant.
53 Immediate Action 1.
If the leakage is in excess of that allowed by Technical Specifications, the reactor must be shut down and the valve repaired.
5.4 Follovup Action 1.
Repair prior to resuming operation.
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2 1202 29 Date:
12/15/72_.o 4494
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. 6.
INCPIRA"TTI PRESSITit*ZIit E8"'n(S) 6.1 Symptmas 1.
A heater bank fails to indicate energir.e4 for RC pressure below the setpeint.
- 2.
Fault indication (if provided in the electrical circuitry) on one ore more heater groups.
'3.
Abnormally low hester current.
h.
Abnormany slow RC pressure response when beaters are energized.
6.2 Probable Cusse 1.
Failed hesters.
2.
Defective control systee.
6.3 :=ediate Action 1.
Operate beak==='17 for defective pressure control systam.
2.
De-energize heaters showing fault indicatica for fault condition.
6.h Fo11ovup Action React r operation may continue within the linits of 3.1.
l Rev.
2 1202 29 Date:
12C.!TR.1495
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-6 T.
PR"SURIZE LTTE I5D!CA'* ION CR CCN"OL MAI?UNC"ICN T.1 Symptoms 1.
One ecmpensated level indication differs fror. the other by more than 1.05, as recorded on RC1-LR.
2.
One uncompensated level indication differs from the others by more than 1.05, as read by plant computer.
3.
The uncompensated indication of a transmitter disagrees with the ccapensated indication by more than:
T inches for pressurizer temperature 600 to 670F.
16 inches for pressurizer temperatures belov 600F.
k.
The uncompensated i=dication on the runote indiestor disagrees with the compensated indication by more than:
16 inches for pressurizar ta=perature 600 to 670F.
26 inches for pressurizer temperatures below 600F.
5 RC makeup flow does not maintain pressurizer level at set point.
7.2 Discussion 1.
Comparison of une.._pensated indications vill help locate a transmitter problem. Manual ce=pensation of these i=dicators vill help incate
~~
a level compensating arsplifier er recorder prehlen.
2.
Checking =akeup valve position de=and may help locate a prob 1'em in the amplifier or recorder.
i 3.
Comparing indications using each temperature transmitter vill locate a problem in the element or transmitter.
k.
Pressuriser level ecutrol problems with no acconrpnyi=g level information discrepancy '-diestes a problem in the level controller or makeup ralve.
j T.3 Inmediate Action 1.
Label the affected level indications as out of calibration. Calibrate l
the affected component (s) at the earliest available opportunity.
2.
If affected indications vary by more than k.0%, label the offending courponents as out of service. Take immediate action to schedule repairs as only two channels remain in operation.
3.
Control pressurizar level on properly operating chennels. If two l
1evel indications a.;ree, within the limits above, switch level control to one of then.
is' B A496 Rev.
2 1202 29 Date:_12/.15/72
~~
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7 NO Z: When switching trans=itters,,take manual control of the makeup valve to avoid response to potentially false signals.
.k.
If there is no agreement, or the remaining chennels drift apart by more than k.0%, take manual centrol of the level, shut off hesters and begin plant shutdown. Use the lowest indication for heater protection and the highest to prevent excessive level.
EC1'E: If pressure cannot be maintained, and the operator calculates that the heaters are covered, heaters may be mamtally operated to maintain RC pressure as required.
5 If all pressurizer level indication is lost, the reactor must be shutdown, l
if operating, and the NSS must be cooled down. This can be accomplished l
by doing the following:
l 3CTE: This procedure asr=nes that pressuriser level was in its nernal range when indication was lost.
CAUTION: This assumes zero leakage from the system. Careful attention should be paid to RC system possure and other parameters to detect any sign of a leak. A sudden increase in RC pressure might indicate that the pressurizer has reached a solid water state. Conversly, a sudden decrease in the I:
s, l
pessure night indicate that the pressurizer has emptied.
s.
Shut the plant down per appropriate plant procedures and the following:
b.
Concurrently with cooling down add water to the RC system from the W tank, in amounts derived from Figure 1202 29-1.
37 knowing the gal /in of the W tanig -knavn-amounts of water can be added to the,
RCS.
NOTE: Since the W tank volume is insufficient to supply all of the water required, known enounts of reactor grade water vill have to be -batched-into the W tank from an appopriate source.
l CAUTION: A careful inventory of T(ave) and makeup water,both to the RCS and the W tank, vill have to be maintained.
c.
Shutdown the reactor and continue cooldown. Add water as indicated by Figure 1202 29-1. See example 1 and 2.
i t
Rev.
2 1202 29 Date:
32/15/72 l
B 4497
N 7.k Follovup Action 1.
Using the analytical cheeks above, locate and correct the malfanction.
Maintaining a constant load (for cases where reestor is not shutdown) vi.11 aid in locating trouble.
2.
Reactor operation with the level compensating amplifier out of service requires that pressuriser level and headers be controlled manually.
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1 B 4498 l
Rev.
2 1202 29 Date: 12/15/72
8.
USUTTICIENT PRESSUPen3t SPRAY VAL 7I 3YPASS FI4W.
8.1 Symptans 1.
Abnormal difference between RCS and pressurizer boron concentrations.
2.
Abnormal difference between pressurizer spray line and loop A T cold temperatures.
8.2 Discussion 1.
The bypasa spray valve is a4usted for 1 - 1.5 GPM for normal operating conditions to maintada pressurizer bcron concen*a tion close to that of the RCS and protect the s,, ray nozzle.
8.3 Immediate Action (TS) 1.
Manually operate the spray valve to maintain line temperature within limits.
8.h Fo11ovup Action 1.
At the earliest available opportunity, reset the bypass spray flov
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l B 4499 Rev.
2 1202 29 Date: 12/1 M 2
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9 PRI5SURIZIR SMAY VEYZ FAIGP2
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9.1 Symptoms 1.
Jpray valve indicates closed when RC pressure is above its opening setpoint.
~
1.
Spray valve indicates open when RC pressure is below the closing pressure.
3.
Abnormal change in RC pressure without associated change in pressuriser level.
92 Probable Cause 1.
Loss of valve noter or control power.
2.
Yalve notor failure.
3.
Valve binding.
k.
Control contact failure.
9.3 In=ediate Action (Failed Open) 1.
Try to close spray valve nanua n y.
2.
Close spray block valve if unable to close sp.sy valve manually.
3.
Verify heaters retu.u pressure to normal.
Innediate Action (Failed Closed) 1.
Attemptmanualcontro5..
2.
Maneuver with caution observing RC 9.k Fonovup Action (Failed Open) 1.
Manusu y control spray flow using the block valve if necessary.
Tc uovup Action (Failed Closed) 1.
Stabilize reactor power until repairs can be nade.
B 45CO i
s' E
Rev.
2 1202 29 Date: 12/15/72
~..
N.J: 1 Reactor at power, T(ave) 579F, pressurizer level in normal range 1.
While cooling down from 579 o 565F. add liso p loss of water.
See Figure 1202 29-1.
2.
While cooling down from 565 to 555 F, add 1000 gallons of water.
See Figure 1202 29-1.
.3.
Continue cooling down and adding 2000 gallons of water between each of the following temperatures:
555 - 525 - 500 - 465 - 430 - 395 - 350 - 305 - 250 - 185 - 90 NOTI: 2000 gallons of water is approxi=ately egal to 8h inches cf pressuri:er level. This would eliminate the danger of u= covering the heaters or going solid when starting from the normal range of the pressuri:er.
ZZAMP1Z 2 Resctor shutdown, Te 500 F. Pressuriser level in scrual range.
1.
While cooling down from 500 to h90F., add 700 gal. of water.
See Fig. 1202 29-1.
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B 4501 3
Rev.
1202 29 Date: Ji2V73
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s FIGUAE 2 ACTU AL V3 11101 C ATED UNCOMP EN SA.TED PRE 33Utl ZER LEVEL Pressurizer Water Temp, F 6 50 570 U0 370 270 70 180 0 siis !!Qii!"!ii!!Iiii'fliPiiiiiia/i;MP 'l ':!EfEFEP-i:*m# iMis/
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