ML20246J667
| ML20246J667 | |
| Person / Time | |
|---|---|
| Site: | Byron  |
| Issue date: | 08/28/1989 |
| From: | Chrzanowski R COMMONWEALTH EDISON CO. |
| To: | Murley T Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 8909050234 | |
| Download: ML20246J667 (12) | |
Text
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') Commonwealth Edison
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72 West Adams Street, Chicago, llhnois F
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Address Reply to: Post Office Box 767 August 28, 1989
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lR Dr. Thomas E. Mu'rley, Director.,
i' Office of Nuclear Reactor Regulation U S. Nuclear Regulatory Commission.
-Hashington, DC: 20555
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Subject:
Byron Station Units 1 and 2.
Economic Generation Control System NRC Docket Nos. 50-454 and 50-455
Dear Dr. Hurley:
L The Economic _ Generation Control (EGC) System is designed to allow either the remote dispatcher or the unit operator to change turbine generator load-by providing a' signal.to the Digital Electro Hydraulic. Control (DEHC)
System. Commonwealth Edison uses the EGC System at Dresden, Quad Cities, and L
LaSalle Stations. The installation of the EGC Systen at Byron Station has L
recently been completed with the final on-line testing remaining.
This letter L
.is to notify.the NRC of the scope of the test and future plans for EGC at Byron Station.
Attachment A contains a brief description of the EGC system.
LAttachment.B contains a copy of the special test that will be performed at Byron' Station during September 1989.:
Following the on-line test, and prior to
' full-time operation of the EGC system, Commonwealth Edison plans to place the system'in service for one year to collect: data for the completion of a Westinghouse design analysis.
Please direct any questions regarding this matter to this office.
Very truly yours, fk Md l
R. A.
irzanowski l.
Nuclear Licensing Administrator cc:
Byron Resident Inspector L. N. Olshan - NRR Region III Office Office of Nuclear Facility Safety - IDNS foc> {
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'8909050234 890828 ADOCK0500g4 DR
Attachment _A Economic Generation Control System l^
The Economic Generation Control (EGC) System is designed to allow either the remote dispatcher or the operator to change turbine generator load from a remote station by providing raise of lower pulses into the reference counter of the Digital Electro Hydraulic Control (DEHC) System. The EGC System has two modes of operation.
In AUTO, the dispatcher can control generator load from the System Power Supply Office (SPS0).- In LOCAL, the operator can control generator load from the EGC control panel. The system is provided with a primary and backup pulse circuit from the load dispatcher.
The pulses are transmitted via a tone type telemetry system to the EGC chassis assembly on the control room panel.
In the EGC chassis assembly, various printed circuit cards in the control logics _ convert the tone signals to pulses for use by the DEHC System.
The internal circuitry is preadjusted so that the rate at which generator load can be changed is limited to a fixed value. As generator load is increased or decreased, the megawatt transducer signals from the DEHC System are fed back to the analog input section of the EGC cabinet and to the SPSO.
In the EGC cabinet, the megswatt signals are compared to high and low limits set by the operator.
If either limit is exceeded, control in that direction is blocked or suspended.
This means the operator can limit the range of megawatts he will allow the SPS0 to control.
The EGC System control panel, located on the turbine control console in the Main control Room, permits the operator to select the AUTO or LOCAL mode control by the EGC System.
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f ATTACHMEHL3 SPECIAL PROCEDURE TO TEST THE EGC SYSTEM ON LIRE 0264T:3 1
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/Sv.s k,.i o SPECIAL PROCEDUU TO TEST THE BGC SYSTEN ON LINE 1
l A. STATEMENT OF APPLICABILITY:
-The purpose of this procedure is to provide the steps necessary to test the operation of the EGC system with the unit on line. The output of the generator will be changed through the use of the computer at the System Power Supply Office. This is a generic procedure which can be performed l
.on either Byron unit.
B.
REFERENCEp.
- 1. Modification M6-1/2-86-0155
- 2. Economic Generation Control System PWR Operations System Description, Chapter 37c.
- 3. Letter from B.R. Shelton to R.Pleniewicz et.al. 5-5-89
- 4. Letter from G.P. Toth to B.R. Shelton, 1-13-89.
C.' PREREQUISITE
- 1. Communications between the SPSO and the Main Control Room have been.
established, and the limitations of section E have been discussed with the SPSO.
- 2. The unit is operating in a stable mode and power is less than or equal to 95% reactor power.
- 3. The rod control system is in automatic control with the auctioneered loop Tave within 1.5 degreee F of the indicated Tref and stable.
- 4. The pressurizer pressure control system is in automatic control with pressurizer pressure within 25 psi of nominal RCS pressure and stable.
- 5. The DEH is in Operator Auto.
- 6. Delta I is within 2% of the target for the controlling channel and is stable with no xenon oscillations.
D. PRECAUTIONS:
- 1. Execution of this procedure will initiate unit load changes. Applicable operations personnel must be briefed prior to execution of this procedure to ensurn ramping guidelines and affect on primary system components have been adequately reviewed.
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-E.. LIMITATIONS AND ACTIONS:
- 1. EGC load changes'are to be limited to a band not to exceed 10% of-7
-nominal reactor full power.
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- 2. Reactor power must not exceed 98% rated thermal power during EGC operation.
- 3. RCS Temperature and Pressure must be kept within Tech. Spec limits l
during the execution of this procedure.
- 4. Axial Flux Difference must be kept within Tech. Spec. limits during the executation of this procedure.
- 5. During ECC operation the rod control system and pressurizer pressure system must be operated in Auto.
6, Due to operational and calibration differences a mismatch may exist between the strip chart indication for unit load and the DEH indication for unit load.
- 7. AFD should be maintained within 2% of the target value. If a xenon oscillation is induced during the EGC operation use control rod motion to dampen the oscillation.
B. EGC operation will not be conducted concurrently with daily load follow.
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1.1 VERITY.the Rod Control System is operating in the Automat'ic mode
.within the PLS band of + 1.5 d9grees F.
/
1.2 VERITY the Pressurizer Pressure system is operating in the Automatic mode within 25 ps.1 of nominal RCS pressure.
/
1.3 RECORD the following information:
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Generator Load MWe Reactor Power
/
- NOTE *********************************
The following trend should be set up as indicated. Howeverlif due to unforseen circumstances the indicated points are not available,
' equivalent points may be used as replacements. The points indicated
- when' applicable are from the same loop. If replacement, points are used, the attempt should be made to record applicable information from a common loop. The trend should be set up to record at the fastest possible rate during at least one of the load ramps, but the frequency does not need to be maintained at the fastest rate for the duration of the test.
1.4 SET UP a computer trend to provide information on the following points:
U1169 Power Range Channel Average Power Q2800 Generator Megawatts T0496 RC Tref Program Temperature T0400 RC Loop A Tave UO403 RC Loop A Delta T U1141 Quad 1 Delta Flux (N43 Channel)
T0418 S/G A Feedwater Temperature F0403 S/G A Feedwater Flow FO4C5 S/G A Steam Flow PO400 S/G A Presrare LO400.S/G A Level PO480 Pressurizer Pressure LO480 Pressurizer Level F0128 Charging Meader Flow T0482 Pressurizer Surge Line Temperature U0052 Control Bank D Position PO398 Turbine First Stage Pressure PT-505 U8059 Total Thermal Power U1145 Target Delta Flux for Channel N43 l
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.l.5 RECORD the *As'Foun(" setting for the EGC thumbwheels in the Main
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. Control Room.
- High Limit Low Limit Ramp Rate
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l 1.6 SET the high limit thumL wheel to 10 Megawatts greater than the value recorded in step 1.5.-
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'l'.7 ' SET the' low limit thumb wheel to 40 Megawatts less than the value recorded in step 3.5.
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1.8 SET the ramp rate thumb wheel to 1 Megawatt per minute.
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- NOTE *********************************~
The following step will place control of the DEH in the Remote -
mode. When making the transfer the unit load should be monitored to a ensure no Megawatt changes take place. Should Megawatt changes.
. occur, the DEH rhould be placed back in Manual mode and load should
- be stabilized using the GV Raise or.CV Lower pushbuttons.
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1.9 DEPRESS the Remote pushbutton on the DEH panel to transfer. control of the DEH in the Remote mode.
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1.10 VERIFY-the following light indications are corrects DEHe' Reference-Idle, EGC Status : Low Limit-Off Manual-off Decr Rate Limit-Off Auto-Off Incr Rate Limit-Off Remote-On High Limit-Off-Raise Input-off EGC Annunciator-Off Raise Output-Off Lower Input-Off EGC Pushbuttons: Backup Pulse-N/A Lower Output-Og Auto-Off Ext Block-Off Primary Pulse-N/A Ext Trip-off Raise Program-Off Input Fail-Off Trip-On Act Fall-Off Lower Progre.m-g 1.y VERIFY the SPSD indication for unit EGC availability indicates the unit is not available for EGC operation.
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- NOTE *********************************
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The following step does not.need to be performed if the EGC system
'is aligned to receive primary pulse signals. The step may be marked *-
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i 1.11 DEPRESS the Primary Pulse pushbutton and VERIFY the upper half of the -
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pushbutton status light remains steadily on.
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- NOTE ***********************************
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Unit load should remain stable when the EGC is placed in the Auto mode. If rapid changes in generator load occur after the EGC is..
placed in Auto the EGC Trip pushbutton should be depressed. If the load swings do not stop, the DEH should be placed in Manual.and load should be stabilized using the GV Raise or Lower pushbuttons.
1.13 DEPRESS the Auto pushbutton on the EGC panel and VERIFY the Auto pushbutton light comes on and stays on.
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1.lf VERIFY the SPSO indication for unit EGC availability indicates the unit is available for EGC operation.
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Load Decrease with the EGC 1.ly VERIFY the unit NSO concurs with the load decrease to be initiated in the following step.
NSO
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1.fG REQUEST the SPSO to initiate a load decrease and RECORD the following starting information l
TIME MEGAWATTS
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j1.37VERIFYthefollowinglightindicationsarecorrect:
DEH. Reference-Decr.
EGC Status : Low Limit-Off Manual-Off Deer Rate Limit-Off Auto-Off
.Incr Rate. Limit-Off
=1 Remote-On High Limit-Off Raise Input-Off EGC Annunciator-0.ff Raise Output-Off Lower Input-On
,EGC Pushbuttons: ' Backup Pulse-Off Lower Output-on Auto-JO Ext Block-Off Primary Pulse-On Ext Trip-Off Raise Program-Off-Input Fail-Off Trip-Off Act Fail-off Lower Program-Off i
.j 1.17 After approximately 20 minutes request the SPSO to halt the load
. increase and RECORD the following information:
TIME MEGAWATTS RAMP RATE
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1.IT VERIFY the lower input and lower output status lights are not blinking.
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1.20 DEPRESS the EGC Trip pushbutton and VERIFY the Trip light comes on and Auto light goes out.
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1.11 SET the ramp rate thumbwheel to 2 Megawatts per minute on the EGC panel in the control room.
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1.22 DEPRESS the Auto pushbutton on the EGC panel and VERIFY the Auto light comes on and the trip light goes out.
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Test of the Low Limit 1.23 VERIFY the unit NSO concurs with the load decrease to be executed in the following step.
NSO
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1.2Y REQUEST the SPSO to initiate a load decrease and RECORD the following starting information:
TIME MEGAWATTS
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1.25 Continue to decrease load until the unit output reaches the low limit value. RECORD the following information:
TIME MEGAWATTS RAMP RATE
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,p 1.24 VERIFY the load decrease stops when the low limit is reached.
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1.27 VERIFY the following light indications are corrects DEHs Reference-Idle EGC Status : Low Limit-On Manual-off Decr Rate Limit-off Auto-Off Incr Rate Limit-Off Remote-on-High Limit-Off Raise Input-Off EGC Annunciator.Off Raise output-off Lower Input-Off EGC Pushbuttons: Backup Pulse-Off Lower Output-Off Auto-On Ext Block-Off Primary Pulse-On Ext Trip-Off f
Raise Program-Off Input Fail-off Trip-Off Act Fail-off Lower Program-Off
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1.2P DEPRESS. the EGC Trip pushbutton and VERIFY the Trip light comes on and the Auto light goes out.
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1.2T SET the EGC High Limit to a value 20 Megawatts more than the current Megawatt value.
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' l. 50 DEPRESS the Auto pushbutton on the EGC panel and VERIFY the Auto light stays steadily on and the trip light goes off.
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.l.38 SET the EGC ramp A' ate to 1.0 MWe/ Min on the EGC panel.
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Load Increase with the EGC System l
- NOTE ************************************
In this test section the SPSO will initiate a load increase. The ramp rate will be verified and the halt of the ramp rate at the high
- limit will also be verified. If rapid changes in generator load occur the EGC Trip pushbutton should be depressed. If the changes do
- not stop the DEH should be placed in Manual and load should be controlled using the GV Raise / Lower pushbuttons.
1.31-VERIFY the unit NSO concurs with the suggested load increase to be performed in the following step.
NSO
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1.33 REQUEST the SPSO to initiate a load increase and RECORD the following starting information:
TIME MEGAWATTS
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p 1.W VERIFY the fol' lowing light indications are correct:
DEH: Reference-Incr.
EGC Status : Low Limit-Off Manual-Off Decr Rate Limit-Off.
Auto-Off Incr Rate Limit-Off Remote-On High Limit-off Raise Input-on EGC Annunciator-Off Raise Output-on Lower' Input-Off EGC Pushbuttons: Backup Pulse-Off Lower Output-OH Auto-On Ext Block-Of2 Primary Pulse-on Ext Trip-off Raise Program-Off Input Fail-off Trip-Off-Act Fail-Off Lower Program-Off
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$ 1.35 VERIFY the unit load increase halts at the high limit value and RECORD the following information:
Time Megawatts Ramp Rate
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1.34 VERIFY the high limit light is on und the DEH reference is not increasing.
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1.37 DEPRESS the EGC Trip pushbutton and VERIFY the Trip light stays steadily on and the EGC Auto light is not illuminated.
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Restoration
- NOTE ******************************************
The following steps will disable operation of the EGC. The DEH will
- be transferred from Remote to Auto.
1.# DEPRESS the Operator Auto pushbutton on the DEH panel.
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1.39 VERIFY the Operator Auto pushbutton stays steadily on and the Remote pushbutton light goes out.
/
- 1. @ RESTORE the EGC thumbwheels to their "As Found" position.
As Found High Limit j
I Low Limit Rate Limit
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ACCEPTANCE CRITERIA:
.1.
The Raise, Input and Raise Om put lamps light when'given remote signals to raise the unit out put.
2.
The Lower Input and Lower output lamps' light when given remote-signals to lower the unit outputa 3.
The EGC system is blocked when the high power limit is. reached in
.the raise direction in the primary mode.
4.
The EGC system is blocked when the low power limit is reached in the lower direction in the primary mode.
5.. The unit can be ramped up an'd down by.the load dispatcher at a ramp rate less than or equal to the rate entered on the EGC panel-in the main control room.
6.
The unit ramp will be stopped when either the high or low limits
'are reached.-
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