ML20024C551
| ML20024C551 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 10/09/1972 |
| From: | GENERAL PUBLIC UTILITIES CORP. |
| To: | |
| References | |
| TASK-01, TASK-02, TASK-1, TASK-2, TASK-GB GPU-2022, NUDOCS 8307120796 | |
| Download: ML20024C551 (5) | |
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This procedure provides the necessary steps to be performed folleving a reactor trip.
2.
DESCRIPTION:
Reactor protection system trip setting limits are listed in table 1202.04-1.
3.
LIMITS A.W 78ECAt;TIONS:
3.1 Any ha=d/ auto statica in the ICS that would prevent feed water fres responding to automatic signals must be controlled by the operator.
3.2 re act reset reactor trip until after the turbine bypass valves I
have been pl.sced in manual.
3.3 In the event of a sudden and rapid unexplained decrease in the
- reactor ecolant systes pressure and pressuriter level, follow m
QF 1202.06, loss of reactor coolant / reactor coolant pressure.
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4.1 Symptor.s:
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Reactor trip slara.
2.
Individual and group "in lights" actuate.
5-3.
Rapid decrease in neutron level indicated by nuclear t',
itstrumentatica.
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4.
Turbine trip slara.
5.
Rapid decrease in unit load.
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t-F 4.2 Inmediate Action:
1.
Verify that all rods, except group 3. are at their "in P
limit".
If any reds are not at their in limit,nanually e
trip the reactor.
2.
Yerify that the turbine has tripped.
If the turbine has 5
not tripped, manually trip the turbine.
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3.
Close the letdown isciation valve.
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4 Monitor pressuri:er level and maintain greater than or f.
equal to 100".
Start second makeup pump as necessary.
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Verify that turbine bypass control valve setpoint trans.
ferred to setpoint +125 PSIC.
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4.
Yerify ICS transfers to track and that feedwater flow contro1, responds properly if in auto. If in hand take f-a;;ropriate action.
4.3 Follow up Action:
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1.
Notify the shift supervisor.
2.
Perform reactivity balance calculatica according to OP t
1103 15, reactivity balance calculation, to insure suf-(
ficient shutdon nargin (> 1 percent DE/I).
If necessary.
borate according to CP 1173 04 soluble poison concentra-
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tion control.
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3.
Turbine plant.-
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Follow 0F 1202 02, turbine trip.
i-4 Feedwater and CTSG 1evel.
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Verify that at least OT5G minimun level (30 inches i
a.
on the start up range) is maintained by the start y-l up control valves in auto.
K2Y. NO. 1 OP 1202 04 10/9/72
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Secure one main feedwater pu=p if both pu=ps are en line.
In the event of a loss of both main feed.ater pu=ps.
c.
verify the following:
1 1.
The steam driven energency feed pump starts.
2.
Main and SU feedwater block valves close.
3.
The emergency blocks and the e=ergency feedpuzy discharge valves open.
5 5.
Monitor makeup tank level and maintain level greate'r shar. 55 *r.ches by feedin; frem bleed holdup 1
tank that has a bcror. concentration greater than er equal to RC systen bcron concentration.
Reactor coolant pressure.
6.
Verify that the reactor coolant pressure returns to a.
nor=al operating pressure.
b.
In case of high pressure, verify that pressuri:er spray
.has actuated at 22c5 FS:C (if reacter coola t pumps arc on) and pcwer actuated relief valve opens at setpoint
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I (2:55 PSIG).
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Main steam pressure.
g If low condenser vacuum inhibits bypass steam flow.
s.
verify that atmospheric exhaust valves actuate and that turbine bypass valves are closed.
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Reactor coolant flow.
Verify that the reactor coolant flew is maintained at d
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normal value.
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In the event all four reactor coolar.t pu=ps trip, follow e
OP 1:0214 loss of RC flow - RC pump trip.
,,3 9.
Neutron level.
l Verify that neutron level is decreasing and that high voltage l
to source range nuclear instru=entation is auto =stically energi:ed at preset level (5 x IC-10 Axpy.
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10.
Condensate pumps.
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Stop all but one main condensate pump.
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- 11. Heater drain pumps, feedwater system.
Stop all heater drain pumps.
- 12.
Request a post trip review 6utput from the plant computer.
13.
Investigate to deternise exact cause(s) of trip.
14 Correct cause(s) of trip.
15 Lever pressuri=er level setpoint to 100 inches (255) if hot shutdewn status is to be maintained versus cooling down.
- 16. Take =anual control of turbine bypass valves and gradually decrease header pressure to 655 psis. F.aintain pressuriser level and makeup tar.k level within li=1t= while decreasing pressure / cooling dcwn.
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