ML20053A252
| ML20053A252 | |
| Person / Time | |
|---|---|
| Site: | Fort Calhoun  |
| Issue date: | 02/09/1978 |
| From: | OMAHA PUBLIC POWER DISTRICT |
| To: | |
| Shared Package | |
| ML20053A183 | List: |
| References | |
| OI-RC-7, NUDOCS 8205250140 | |
| Download: ML20053A252 (6) | |
Text
..... i.
s Fort Calhoun Station Unit No. 1
^
Reactor Coolant System Pressure Centrol OI-RC-7 I.
Purpose This instruction describes the steps to be followed to control system pressure in Manual and Auto =atic modes and maximum spray operation.
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II.
Prerequisites A.
120V A.C. Instrument power is operable from the Instr ment Buses A and B.
B.
Pressurizer heater power is operable from:
'\\
h 1.
MCC-3Al to Heater Groups 1, 2 and 3 2.
MCC-3Cl to Heater Groups k and 5 3
MCC-3B1 and hAl to Proportional Heater Groups.
h.
MCC hB1 to Heater Groups 8 and 9 5
MCC-401 to Heater Groups 10, ll,.and 12.
C.
Instrument air is operable to the pressuricer spray valves.
III.
Precautions A.
Pressurizer maxi =tml heatup rate is 100 F./ hour and-
.'3')
caximum cool'down rate of 200*F./ hour (. Tech. Spec. 2.1.21 B.
System allavable pressure versus temperature conditions shall be in accordance with Tech. Spec. 2.1.2.
C.
Observe the following temperature differential limitation between the pressurizer water temperature and cold leg temperature.
1.
Minimum of 30 F. when reactor coolant system temperature is greater than 200 F.
2.
M mm of 200 F. (maybe exceeded via Section IV.D. of lI?P m
this instruction.
l i
l D.
Operation of Reactor Coolant pump RC-3A or RC-3C is perferred
-N-for normal pressurizer spray operation.
E.
When contro'1
- ng system pressure without a steam bubble carefully observe plant pressure when changing temperature or operating reactor coolant system interface valves.
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( -~'v F.
Reactor coolant system pressure must be greater than 155 psig
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for reactor coolant pu=p operaticn to satisfy NPSH requirements,
and less than 265 psia for shutdovn cooling system operation.
A FEB 9 1973 R6 2-9-78 8205250140 820517 PDR ADOCK 05000285 P
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III.
Precautions (continu:d)
F.
and less than 265 psia for shutdown cooling system operation.
G.
A reactor coolant system pressure of 2750 psig must not be exceeded with fuel in the reactor.
.T H.
A reactor coolant system pressure of 2500 psig =ust not be exceeded for reactor coolant pu=p operation.
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IV.
Procecure A.
Manual pressure control without a steam bubble.
1.
To increase system pressure.
3 a.
Select the desired controlling channel either X h#
or Y on E':-103 selector switch, b.
Ensure either PRC-103-X cr PRC-103-Y is in the
" Manual" position with che manual control knob turned to minimm.
c.
Energi:e the proportional heaters by turning their respective control switches to the " Auto" position.
NOTE:
With the controller PRC-103 m,ual control knob in the mini =um position i;he proportional heater output vill be naxi=um.
Increasing the manual control in the clock-wise direction vill
'7 decrease the heater output until controller out-fpq put indicates 50%.
Increasing the controller R~E.
output to greater than 68% vill send out a signal l
to open the spray valves provided the spray l
valves are in " Auto".
1 l
d.
Energi::e the back-up heaters by turning their
(
respective control switches ;o the "on" position.
l e.
When the desired system pressure is attained, place the heater control switches to the "off" position.
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2.
To decrease system pressure refer to OI-CH-1.
h.
B.
Manual pressure control with a steam bubble.
1.
To increase system pressure.
~
a.
Select the desired controlling channel either X or Y on HC-103 selector switch.
b.
Adjust the manual control of PRC-103X and/or PRC-103Y until the output meter indicates 50%.
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J R6 2-9-78 FEB 9 1978
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OI-RC-7-3
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IV.
Procedure (continued)
B.
1.
c.
Place desired proportional heaters in the AUTO position J
and energize backup heaters as desired by placing their respective control switch in the ON position.
d.
Turn the manual control knob of PRC-103X or PRC-103Y counter-clockwise to increase the proportional heater output.
f When the desired reactor coolant system pressure is e.
attained adjust the ec.ntrol knob of PRC-103X or PRC-103Y until 50". is indicated on the outptit meter and place the back-up heaters in:
(1) AUTO if at norn.al operating pressure.
(2) 0FF if at less than normal operating pressure.
.h 2.
To decrease system pressure a.
Place the spray control switches HC-103-1 and HC-103-2 are in the " Auto" position if not already there. -
NOTE: Determine the temperature differential between the pressurizer water and the cold leg.
If the oT is greater than 200 F. proceed in accordance with Section IV of this instruc-tion.
b.
Transfer PRC-103X or PRC-103Y to m ual if in auto-s @,.x.
catic.
Place the back-up heates control svitches in the c.
0FF position if. the pressure is to be reduced belov 2060 psia.
d.
Increase the output of PRC-103X or FRC-103X to greater than 6T". to open the. spray valves.
e.
When system pressure is at the desired value, adjttst the controlling controller output to 50%.
C.
Autenatic Pressure Control 1.
14ni -nm spray operation in automatic
'0 Ensure proportional heater control switches and spray a.
-valve centrol switches..in the." Auto" position if not i-already-Gere.
NOTE:
Determine the temperature differential between the pressuriser water and the cold leg.
If the A T is greater than 200 F. proceed in accordance
(;f) with Section IV.D. of this instruction.
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CI-RC-7 k IV.
Procedure (continued)
C.
1.
b.
Energize back-up heaters by placing their control frw
.. switches in the CN position.
%d Ensure that spray valves automatically open to c.
ter=inate pressure increase.
2.
Returning pressure control to nor=a.1 operation folleving (3
.s
=aximum spray operation.
Deenergize back-up. heaters by placing their control a.
switches in the AUTO position.
b.
Ensure that RCS pressure returns'to normal autcmatically.
3.
Manual to Automatic Operation
{
a.
Position to Manual Auto Transfer Switch to the
" Balance position".
b.
When Deviation indicator indicates zero deviation, place the transfer switch to the " Auto" or "0-100" position.
NOTE:
If necessary transfer frcm manual to auto =atic may be done without balancing.
Nof h.
Autc=atic to Manual operation.
- -9 a.
Position the Fanual Auto Transfer Svitch to the " Balance" position.
b.
Adjust the Manual Control knob until cero deviation is indicated and stabilised.
c.
Position the transfer switch to the " Manual" or "0-100" position.
NOTE: Transfer from Autenatic to Manual =ay not be done without l
balancing.
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D.
Operation above 200 F. temperature differential between pressurizer water and spray water temperature.
NOTE:
Deter =ine the te=perature differential tetween the pressuriser water and the cold leg.
If the AT is greater than 200 F.
I proceed in accordance with Section IV.D. of this instruction.
a.
If the difference between the pressuriser water temperature h-.
and the spray vater te...perature is equal to or less than 200 F.
there are no requirements under this instruction.
m ISSUED 36 2-9-78 FEB 9 1978
IV. Procedure (continu:d)
D.
b.
If the difference between the pressurizer water te=perature and the spray water temperature is greater than 200 4., the folleving procedure is to be used.
A stray. cycle is defined as the opening and closing c.
of a spray valve, either main spray or auxiliary spray.
f-
'h 1.
If the difference..between the pressuriser water temperature and the spray water temperature exceeds 200 T., each spray cycle and the corresponding temperature difference is legged in the Pressurizer Spray Operation Cumulative Usage Log.
2.
At ycarly intervals the cu=ula'tive spray cycles in the log are totaled.
If the total nu=ber of cyles are equal to or less h
than 1000 no further action is required.
3 If the cu=ulative total number of cycles exceeds 1000 the spray no :le usage factor =ust be calculated using Table 1.
If the calculated usage factor frc= Table 1 is equal to or less than 0 75 no further action is required.
b.
If the calculated usage factor from Table 1 exceeds 0 75, pressurizer spray operation =ust be restricted. The diff-erence between the pressuriser water temperature and the spray water temperature cust be equal to or less than 200T. When spray is operated.
h NOT21 An investigation of no::le fatigue must be perfor=ed to show the no::le suitable for additional service before the restriction is removed.
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Calculational Procedure for Pressuriser Spray No :le Usage Factor 4
Q_ga,t Stecs to comulete Table:
A.
Fill in colu=n "N" from bhe Pressuriser Spray Operation Cumulative Usage Log
- r3 Calculate "N/N " (diride N by N )-
3.
A A
C.
Add colu=n "N/N " to find IN/II this is the usage facter.
A a
4.T' cpo 3
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A, a
201 - 300 13,000
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301 400 5,000 M
h01 - 500 3,000 501 - 600 1,500 Z:i/NA r
40 - Tc=perature difference between pressurizer water and spray vater e,
rjj Ug Allove.ble number of spray cycles
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- :*u=ber of logged cycles at AT indicated w-FEB R6 2-9-78 9 1973
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