ML20083B458
| ML20083B458 | |
| Person / Time | |
|---|---|
| Site: | McGuire, Mcguire  |
| Issue date: | 05/03/1995 |
| From: | Mcmeekin T DUKE POWER CO. |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| NUDOCS 9505120055 | |
| Download: ML20083B458 (53) | |
Text
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- DukeIbwer Company T.C M6daxn l
hkGuire Nuclear Genemtion Department Voce hesMent '
12700HppersTenyRoad(AIG0lVP)
(704)87S4800 Huntersutile,hr28078&985 (704)8754809 Fax L
DUKEPOWER May,3,. 1995 U.S. Nuclear Regulatory. Commission Attention:
Document Control Desk Washington,:D.C.
20555
Subject:
McGuire Nuclear Station, Units 1 and 2 Docket Nos. 50-369 and 50-370 Supplemental Information Relating to Proposed Technical Specification Amendment Submittal 9/28/94 p
4 kV Loss of Voltage and. Degraded Voltage Conditions Tables 3.3-3, 3.3-4, 3.3.5, and 4.3-2 p.
f'
Dear Sir:
Please find attached our response to your Request For Additional Information dated February 3, 1995, regarding the subject given above. includes our item-by-item response to your questions. includes our setpoint calculation for the loss of voltage and degraded voltage relays.
includes our electrical elementary diagrams showing the proposed second' level degraded voltage relaying circuitry.
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Please. contact P. T. Vu of McGuire Regulatory Compliance group at j
(704) 875-4302 if there are any questions regarding this i
additional information.
Very truly yours, l
(
/
/
T.C. McMeekin
/X 9505120055 950503 U
- Attachments PDR ADOCK 05000369 p
PDR l
naea re mwwoara
\\
-U.S.
NRC May 3, 1995 Page 2~
xc: (with all attachments)
Mr.
S.D.
Ebneter Administrator, Region II U.S. Nuclear Regulatory Commission 101 Marietta St.,
NW, Suite 2900 Atlanta, GA.
30323 Mr. V. Nerses Office of Nuclear Reactor Regulation U.S. Nuclear Regulatory Commission One White Flint North, Mail Stop 9H3 Washington, D.C.
20555 Mr. G. Maxwell NRC Resident Inspector McGuire Nuclear Station Mr. Dayne Brown, Chief Division of Radiation Protection P.O. Box 27687
- Raleigh, N.C.
27611-7687
)
U.S. NRC May 3, 1995--
- Page 3
- bxc: (with Attachment 1 only)~
A.V. Carr (PB05B)
U.A. Copp (EC05N)
D.
Jamil (MG01EE)
W.N. Matthews (MG01EE)
' A.C. Williams (MG01EE)
MNS RGC Tech. Spec. Subject File e:
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ATTACHMENT 1 ITEM-BY-ITEM RESPONSE
U.S. NRC.
May 3, 1995 Page 1 i
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1.
Discuss how the proposed second level of undervoltage protection conforms to B1, B2, B3 and B4 of PSB-1 B.1.a The second level undervoltage setpoints'are based on load flow calculations MCC-1381.05-00-0098 and MCC-1381.05-00-0135, which determine essential bus and equipment terminal voltages during a degraded voltage condition.
This information was used to perform a worst case calculation for motor control center starter control circuits (MCC-1381.05 t 0147) and essential 120 VAC panelboard loads (MCC-t 1381.05-00-0235).
j B.1.b.1 The first time delay relay is used to prevent unnecessary separation from the offsite power l
source as a result of motor starting and other transients.
The duration of the first time delay is based on the longest acceleration time _for any r
safety related motor.
The AFW pump motor requires the longest acceleration time (MCC-1381.05-00-0094) of approximately 9 seconds at 80% voltage (>80% is available to the motor).
This time delay is limited to 11 seconds which allows margin for the i
voltage to recover above'the pickup setpoint and to account for.the timer uncertainty.
If a Safety Injection signal was to occur following the completion of the first time delay, the 4kV bus would be automatically separated from offsite power.
B.1.b.2 The second time delay relay determines how long the plant will operate at the degraded voltage setpoint.
The 600 second time limit acknowledges that loads can not be operated continuously below the dropout setpoint and gives the operator time to improve voltage before transferring to the alternate source.
Equipment will not be damaged during such a short duration.
There will be no appreciable reduction in service life as a result of operation for such a short time.
The McGuire e]ectrical system design provides safety related motors with overcurrent protection set to 150% of the rated full load amperes.
This is enough margin to allow these motors to operate at the degraded voltage setpoint for 600 seconds.
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U.S. NRC l
May 3, 1995 Page 2 B.l.c.1 All of the degraded voltage relays are safety related and connected to the existing potential l
transformers which are connected to the essential 4kV bus.
The Emergency Diesel Generator (EDG) l output is also connected at this point in the system.
j B.1.c.2 There will be three relays per train connected in two-out-of-three (2/3) logic to detect both a loss of voltage and a degraded voltage condition (total of six relays per train).
These relays are all single. phase relays which will indicate undervoltage on one phase, but will not initiate action until the 2/3 logic is satisfied.
Following the appropriate time delay and permissive logic the 4kV bus will be automatically separated from f
offsite power sources.
B.1.c.3 See B.1.c.2.
B.1.c.4 See B.1.c.2.
B.1.c.5 Provisions for test and calibration are included consistent with the existing loss of voltage circuitry.
A key operated test switch is used to place the degraded voltage relays in TEST mode and initiate a status light in the control room.
B.1.c.6 See B.1.c.5.
B.1.d The Technical Specification changes submitted were consistent with the existing voltage protection format and other items in the table.
B.2 During losses of power to the 4kV bus, the degraded voltage logic can not interrupt loading of the EDG.
If during the Safety Injection sequence the voltage remains below the setpoint until the first time delay expires, the 4kV bus will separate from offsite power.
This provides the best power supply to the 4kV bus, i.e. the EDG, earlier in the event of an accident concurrent with degraded voltage.
t Testing of this circuit will be' performed during each refueling outage by the periodic Engineered i
Safeguards Functional testing.
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B.3 System optimization is performed by calculations MCC-1381.05-00-0098 and MCC-1381.05-00-0135.
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U.S. NRC May 3,_
Page 3 j
1995.
1 B.4 The ASDOP computer program used to perform the McGuire analyses has been verified at other Duke Power generating stations by actual measureme.nt
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(OSC-1612 and CNC-1381.05-00-0071).
The analytical technir;ues are no different for the McGuire i
analyses than that used in the verification performed on the other Duke Power stations.
t How would the plant respond to events similar to Millstone 2a.. -and Arkansas Nuclear One? Include a brief timeline of I
expected events, plant responses, alarms and operator
-l actions.
1.
Timeline and automatic plant responses:
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{
t= 0sec t = 11 see t = 600 soc PLANT 4kV PLANT 4kV VOLTAGE DECAYS IN VERIFIEO; DV CONTINUES; l
POWER SYSTEMS POWER SYSTEMS 70 DEGRADED ALARM INmATED, SEPARATE 4kV ALIGNED TO AUGNED TO VOLTAGE SETPOINT
& St SEPARATION BUS FROM
.t TWO BUSUNES ONE DUSLINE (SUFFICIENT VOLTAGE PERMISSfvE GIVEN OFFSITE POWER l
UNTIL THIS TIME) 2.
Alarms: See 3a below.
3.
Operator actions: See 3b below
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f 2b.
Would the McGuire design avoid the same consequences?
[
t Following the guidance.of PSB-1 and the setpoint philosophy i
provided in response to Question 8a, McGuire would avoid these consequences.
3a.
Describe the degraded voltage alarms, alarm setpoints and any time delays.
See proposed Technical Specification submittal Technical i
Justification for description.
Each loss of voltage and degraded voltage phase relay operates a control room status light.
Once the 2/3 degraded voltage logic and first time delay is satisfied, an annunciator is activated in the control room.
When the degraded voltage relays are placed in TEST mode a status light is also activated.
I 3b.
Describe the operator's response to the degraded voltage alarms.
The formal operator response procedures are currently in development.
The operators will be taking actions as indicated below:
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U.S. NRC May 3, 1995 Page 4 i
- Contact area dispatcher to determine power system grid situation and possible improvements
- Verify actual condition (not a single failure)
- Verify function of Main Generator Voltage Regulator-j
- Decrease auxiliary' system loads
- Change or halt work on related systems such as the Emergency Diesel Generators,-the Standby Shutdown
' Facility diesel generator and-shared transformers i
3c.
Address whether automatic plant actions alone would prevent the tripping of loads, blowing of control fuses or damage of equipment during a degraded voltage condition.
The setpoint basis is such that these situations will not occur.
i 3d.
Are the operators cautioned to avoid taking actions that l
would precipitate these problems during the 600' seconds before automatic plant actions?
The operators would be contacting the dispatcher to i
determine if the grid voltage could be improved and possibly l
reducing auxiliary loads in the plant.
These actions will i
not further degrade the voltage.
^l 4.
If the grid voltage is at minimum level, provide a i
discussion of how the loading of buses by both safety and non-safety loads affects the setpoint determination during events such ass (1) a reactor trip with a return to power, (2) a reactor trip with subsequent institution of shutdown cooling, and (3) a loss-of-coolant accident.
i The setpoint of the degraded voltage relaying was based on assuring adequate voltage at the terminals of safety system loads during a loss of coolant accident.
For this loss of coolant event, all normal power operation non-safety loads j
were assumed to be operating as well as all safety loads required during a loss of coolant accident.
The safety i
system loading is more severe for a loss of coolant accident than for 1) reactor trip with return to power or 2) reactor trip with subsequent initiation of shutdown cooling; and the non-safety system loading assumed for a loss of coolant event is as great as that for 1 or 2.
Hence, basing the
)
degraded grid relay setting on the loss of coolant event will also assure adequate safety system voltage for events 1 and 2.
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U.S. NRC May 3, 1995 Page 5 5.
Discuss the margin available between the degraded voltage I
setpoint value and the nominal operating voltage value that ensures that the degraded voltage relays do not spuriously.
trip.
Based on daily average voltages over the last year, the average 4kV operating voltage was 4100V (98.56% of 4160V).
The lowest daily average was approximately 3950V (94.95% of 4160V).
Compared to the highest degraded voltage setpoint l
of 3703V (89.01% of 4160V, Unit 2), there is almost 250V margin.
Considering relay uncertainty, the margin between the normal operating voltage and the setpoint could decrease to 210V (5.05% of 4160V).
3950V - Lowest 4kV 247V 210V I
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3740V - Highest DV STPT + Uncertainty 3703V - Highest DV STPT The indicated 210V margin (5.05% of 4160V) assures that spurious trips will not occur.
6.
Provide elementary electrical schematic diagrams showing the added second level undervoltage protection circuitry.
Se'e Attachment 3.
7.
Provide a discussion that contains information demonstrating that the maximum of a 600 second time delay without a concurrent safety injection signal ensures that all connected Class 1E loads are not damaged and will not trip for voltages that could exist down to a level just above the loss of voltage setpoint.
See Question 1 response to B.l.b.2.
The intent of the loss of voltage relaying is to detect a complete loss of voltage and initiate action to align the Emergency Diesel Generator.
It does not provide additional degraded voltage protection.
Before the degraded voltage is sensed at the plant, the Transmission Control Center (TCC) will already be taking action to improve grid voltage because it will be below the normal operating range.
The TCC has specific guidance on the voltage requirements for the plant and contingencies on how to maintain those values.
Past performance has demonstrated that standard operating procedures have been successful in maintaining adequate switchyard voltages.
U.S. NRC May 3, 1995 Page 6 Once the degraded voltage relays actuate, it is not expected that the voltage would be rapidly decaying because of the compensatory measures taken by the TCC in conjunction with the plant operators.
If it were a more serious collapse of the grid and the voltage was dropping rapidly, the loss of voltage relays would activate prior to the completion of the 600 second timer.
Thus the electrical system relay design provides adequate protection against both loss of voltage and degraded voltage situations and will prevent any damage to class lE loads.
8a.
Provide setpoint calculation.
See Attachment 2.
8b.
Verify that voltages just above the allowable values are adequate to allow all equipment to start and operate properly at all voltage levels down to and including the 120 volt level.
See Question 1 response to B.l.a.
9a.
Describe the criteria used to establish the proposed loss of voltage circuitry setpoints.
See setpoint calculation provided in response to Question 8a.
A load flow calculation was performed which determined the minimum transient voltage on the system.
Considering the channel uncertainties, the relay was set below this value to prevent unnecessary actuation.
9b.
State why the time delay was chosen and is still adequate in view of the fact that the voltage setpoint has been lowered and therefore the relay could be expected to trip later in a scenario of constantly degrading voltage.
The intent of the loss of voltage relaying is to detect a complete loss of voltage not a constantly degrading voltage.
With the addition of the degraded voltage relays, the time response to a loss of voltage is unchanged from the original plant design.
10a. [Concerning the il second time delay for a safety' injection signal) explain why it is not necessary for this proposed technical specification to include a maximum upper time 1 Lait.
The design basis of the first time delay is explained in Question 1 response to B.1.b.l.
The critical restraint was considered to be providing a time delay which would prevent l
U.S. NRC May 3, 1995 Page 7 actuation.during normal system operations.
The intent was to limit the response to a safety injection to within 11 seconds, if possible, considering the longest motor start transient.
Indeed, the time delay relay could be set less than 11 seconds to confirm a degraded voltage condition.
Since the system will not respond to an SI until.the time delay expires, the SI action would be enabled in less than or equal to 11 seconds.
Hence, the Engineered Safety Features Actuation table should specify a less than or' equal sign.
The use of the greater than or equal sign was unintentional.
As such, please find attached at the end of this attachment two new inserts (Insert A and Insert B) and TS page 3/4 3-32, which incorporate the correct *s 11 second with SI",
to be used instead of Inserts A and B and TS'page 3/4 3-32 included in the original submittal dated 9/28/94.
10b. In addition, explain how the minimum 11 second time limit conforms to the accident analysis.
The basis for the 4kV emergency bus undervoltage-grid degraded voltage has always been'less than or equal to 11 seconds.
11.
Provide a technical discussion to address why the setpoint for the first level of undervoltage protection can be less than or equal the value instead of greater than or equal.
The present setting addresses loss of voltage and degraded voltage concerns, therefore it specifies a minimum setting.
The new loss of voltage setting has a single purpose and is based on the worst voltage dip imposed on the system.
Providing an upward limit and setting the relay below the worst case dip reduces time delays and inadvertent actuation resulting from transients.
The relay cannot be set as low as 0 VAC because the setpoint basis is the worst voltage dip minus the relay channel uncertainty.
This places the relay setting just below the minimum expected voltage on the auxiliary system.
s
,_UlW b*.
Unit 1
) 4 kV Loss of Voltage s 3220 volts with a 8.5 0.5 s 3227 volts second time delay L) 4 kV Degraded Voltage 2 3678.5 volts with s il second 2 3661 volts with Si and s 600 second without SI time delays Unit 2
.) 4 kV Loss of Voltage s 3202.5 volts with a 8.5 0.5 s 3206 volts second time delay y_)4kVDegradedVoltage 2 3703 volts with s 11 second 2 3685.5 volts with SI and s 600 second without SI time delays
(
I
Dsee B:
Unit 1 2,
4 kV Loss of Voltage s 3220 volts with a 8.5 2 0.5 s 3227 volts second time delay
- 4. 4 kV Degraded Voltage 2 3678.5 volts with 5 11 second 2 3661 volts with SI and 5 600 second without SI time delays Unit 2 a.,
4 kV Loss of Voltage s 3202.'5 volts with a 8.5 2 0.5 s 3206 volts second time delay k 4 kV Degraded Voltage 2 3703 volts with s 11 second 2 3685.5 volts with SI and s 600 second without SI time delays i
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I TABLE 3.3-5 (Continued)
ENGINEERED SAFETY FEATURES RESPONSE TIMES INITIATING SIGNAL AND FUNCTION RESPONSE TIME IN SECONDS 7.
Steam Generator Water Level Lowlow a.
Motor-driven Auxiliary Feedwater Pumps 5 60 b.
Turbine-driven Aud liary Feedwater Pumps 5 60 8.
Negative Steam Line Pressure Rate - High Steam Line Isolation
< 10 9.
Start Permissive Containment Pressure Control System N.A.
i 10.
Termination Containment Pressure Control System N.A.
11.
Auxiliary Feedwater Suction Pressure - Low Auxiliary Feedwater Pumps (Suction Supply Automatic Realignment)
$ 13 12.
RWST Level Automatic Switchover to Recirculation
< 60 l
13.
Station Blackout a.
Start Motor-Driven Auxiliary Feedwater Pumps
_ 60 b.
Start Turbine-Driven Auxiliary j
Feedwater Pump (6)
$ 60 J
14.
Trip of Main Feedwater Pumps Start Motor-Driven Auxiliary Feedwater Pumps
< 60 1
15.
Loss of Power
' ';" Emergency 9= Underveltage-5 11
- Crfd Degraded Voltage 4 kV Lou of vsif e e.
z,,
- b. 4 kV byrded Vol e
4su w;n gg as
& 600 tJ'-flouf $$
1 McGUIRE - UNITS 1 AND 2 3/4 3-32 Amendment No.
(Unit 1)
Amendment No.1 2 (Unit 2)
ATTACHMENT 2 SETPOINT CALCULATION
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t MCC-1381.05-00-0094 t
Originated:
4Wd Date: 6VX /ve/
Checked:
Date: 8/1Il94
{
l Page: I F
UNIT 1 LOSS OF VOLTAGE RELAY (27) SETTING t
LOSS OF VOLTAGE RELAYS:
127XA,127YA,127ZA, 127XB,127YB,127ZB BUSES MONITORED:
lETA,IETB RELAY TYPE:
ITE-27D CATALOG NUMBER:
211R6175 PICKUP RANGE:
60 - 110V l
DROPOUT RANGE:
Not Adjustable, approximately 3% above pickup l
TIME DELAY:
0.1 - 1 Second INSTRUCTION BOOK:
IB-18.4.7-2, Issue E RELAY SETI'ING SHEET: MCRS-0114-01.01, MCRS-0114-01.02, MCRS-0114-01.03, MCRS-01144)2.01, MCRS-0114-02.02, MCRS-0114-02.03 VT RATIO:
4200/120V
)
The 27 relays are used in a two-out-of-three logic scheme to detect a loss of offsite power condition and initiate separation of the essential switchgear from the normal power supply.
The timer associated with the relays (discussed later) provides the necessary delay to assure that there is a loss of voltage condition.
This is the first level of a two level scheme and its purpose is to monitor for a loss of voltage condition. This setpoint is designed to allow the starting of safety and non-safety motor loads with only one offsite circuit available. The second level is discussed in the next section, j
Degraded Grid Voltage Relay.
The following calculation uses ISA-S67.04, "Setpoints for Nuclear Safety-Related i
Instrumentation Used in Nuclear Plants," to determine the channel uncertainty for the relay monitoring circuit. The channel uncertainty (CU) is then used to determine each relay setpoint.
Maximum Channel Uncertainty j
Each term considered in the CU equation is described below along with the basis for the value assigned.
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MCC-1381.05-00-0094 Originated:
440' Date: #//4/A/
Checked:
'NM 4 Date: _I]> $h *L_,
Page:
t-.
VT Accuracy (PM) = 10.3% of the indicated voltage. The pickup setpoint will be approximately 92V (expected pickup setpoint), so i0.3% difference is.
i 92 x 0.003 = 10.276V Test Instrument (MTE) = 10.5%, based on the accuracy of the digital volt meters presently used. The highest setpoint will be approximately 92 V, so 92 x 0.005 = i0.460V Setting Accuracy = 15% of the pickup setting, this value can be corrected at calibration and is not included in the uncertainty calculation.
Constant Voltage and Temperature Accuracy (OV) = Not provided in relay instruction book.
Considered negligible with the other tolerances, since calibration to the setpoint will be performed.
Voltage Changes Accuracy (VV) = 0.2V for a 10V variation. Based on a 30V battery voltage variation (= 105V - 132V) 0.2/10V x 30V = 0.6V Temperature Changes Accuracy (TV) = 0.5V, based on temperature range 20 to 40 degrees C.
2 HVAC calculation (MCC-1211.00-00-0042, App G, Rev 26) confirms maximum temperature less than 40 degrees C.
Seismic = 0%, Settings will not change as a result of a seismic event.
Radiation = 0%, Relays will be located in a mild environment.
Relay Drift (RD) = Comparing the calculated drift to the actual drift (obtained from IAE data) indicates that more margin should be included to avoid setpoint tolerances which are too small.
RD = 0.5V All terms identified above are classified as Random Independent except for Relay Drift which is a bias.
Loss of Voltage Channel Uncertainty Calculation CU = i( PM' + MTE' + VV' + TV' )* + RD CU = i ( 0.276' + 0.460' + 0.6' + 0.5' )* + 0.5
( Volts)
CU = 10.95 + 0.5 =
- 1.5V
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MCC-1381.05-00-0094 Originated:
dec</
Date: E//4/N Checked:
c)h4-Date: _ /hi/9 4-Page: 3 Unit 1 Loss Of Voltage (LOV) Relay Setpoint NOTE: The term ' pickup' for a 27D relay refers to the voltage where the relay will operate to indicate a loss of voltage. In contrast, the term ' pickup' for a 27N relay refers to the reset value.
Based on the degraded grid calculation (MCC-1381.05-00-0098, Rev 5), the ideal pickup setpoint is given as 0.7758pu (4.16KV base). The actual pickup setpoint should be set below this point by an amount equal to the channel uncertainty to prevent unnecessary actuation.
The ideal pickup setpoint must be converted to the equivalent 120V base relay setting across the VT ratio,4200/120.
Ideal Setpoint = (0.7758 x 4160) x (120/4200) = 92.2V Actual Setpoint (pickup) = 92.2 - 1.5 = 90.7V therefore, due to CU the setpoint could vary in the range
)
pickup + CU = 90.7 + 1.5 = 92.2V pickup - CU = 90.7 - 1.5 = 89.2V The Ideal Setpoint value is the ALLOWABLE VALUE number that is noted in the Technical Specifications.
The above calculation indicates the LOV relays should be set to pickup at 90.7V to prevent unnecessary actuation. The difference betwe-en pickup and dropout, deadband, is approximately 3.0% or 2.76V (3% of 92V setting) and is not adjustable. The reset point should be estimated by the following equation:
reset = pickup x percent deadband reset = 90.7 x 1.03 reset = 93.4V therefore, due to CU the setpoint could vary in the range reset + CU = 93.4 + 1.5 = 94.9V reset - CU = 93.4 - 1.5 = 91.9V The time delay should remain set to 10 cycles to prevent false diesel starting during brief system transients.
.f MCC-1381.05-00-0094 Originated:
d4d Date:
S//4/r/
Checked:
-17M 5 Date: N//i/94-Page : 4-The relay shall be set as follows:
PICKUP TAP: 90V PICKUP VOLTAGE: 90.7V i0.0V TIME DELAY: 10 Cycles,0.167 see The setting tolerance is 10.0V so that the relays will be set to exactly the proper setpoint.
However, when the setpoint is examined after setting the relay or for calibration check it may drift by the amount described below.
Drift associated with the relay DRIFT = i( VV' + TV' )" +RD DRIFT = i ( 0.6' + 0.5' )" + 0.5 DRIFT = 0.8 + 0.5 = i 1.3V Maximum Acceptable Pickup for calibration purposes including tolerances.
= Actual Pickup Setpoint + DRIFT
= 90.7 + 1.3 2
= 92.0V The Maximum Acceptable Pickup value is the TRIP SETPOINT value that is noted in the Technical Specifications. This value shall be conveyed to IAE.
Although the pickup setpoint has 10.0V setting tolerance,10.8 is an expected range for setpoint drift. If the relay setpoint drift is greater than 0.8V and less than 1.3V a calibration j
is required. If the relay were to drift more than 1.3V, Engineering should be notified and the relay re-calibrated. This philosophy is expanded below in Tablel.
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MCC-1381.05-00-0094 Date:.[lf *[44 s/r4/
Originated:
- de/
f Checked:
"f?ht Date: K Page : r TABLE 1 i
Setpoint
. Action i
89.9 5 setpoint 5 91.5 No Re-calibration Required.
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i 91.5 ( se.tpoint 5 92.0 Calibration Required l
or i
89.4 s setpoint ( 89.9 Calibration Required setpoint > 92.0 Calibration Required, Notify Engineering or setpoint < 89.4 Calibration Rect; ired, Notify Engineering f
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i-MCC-1381.05-00-0094 Originated:
oza/
Date:
- //6//d i
Checked:
Wrli-Date:
f?/fi-194-Page: A l
t h
UNIT 1 DEGRADED GRID VOLTAGE RELAY (27D) SETTING DEGRADED GRID VOLTAGE RELAYS: 127DXA,127DYA,127DZA, 127DXB,127DYB,127DZB BUSES MONITORED:
lETA,IETB RELAY TYPE:
ITE-27N, High Accuracy Relay CATALOG NUMBER:
411T0375 PICKUP RANGE:
70 - 120V 7
DROPOUT RANGE:
70 % - 99 %
TIME DELAY:
Instantaneous Pickup and Dropout INSTRUCTION BOOK:
IB-7.4.1.7-7, Issue D RELAY SETTING SHEET: MCRS-114-01.04, MCRS-114-01.05, MCRS-114-01.06, t
MCRS-114-02.04, MCRS-114-02.05, MCRS-114-02.06 VT RATIO:
1200/120V The 27 relays are used in a two-out-of-three logic scheme to detect a degraded voltage condition and initiate separation of the essential switchgear from the normal power source.
5 Timers are also associated with tb relays to provide the necessary time delay to verify there is a degraded voltage condita,... The degraded voltage relaying is considered the second level of protection.
j Once an undervoltage condition is detected, two timers begin timing to verify the event is a sustained degraded voltage condition. If the first timer (62Tl) completes its cycle, an alarm will be initiated in the control room. The second timer (62T2) is provided to allow extra time
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after the first time delay for the operators to improve voltage. If the undervoltage condition i
is still present when the second timing cycle is complete, a blackout will be initiated on that i
train by opening the 4KV normal and standby incoming circuit breakers. Should a Safety Injection signal occur at any time after the first timer completes its cycle, the circuit will i
automatically initiate separation from the offsite power source and transfer to the emergency diesel generators.
i The following calculation uses ISA-S67.04, "Setpoints for Nuclear Safety-Related
[
Instrumentation Used in Nuclear Plants," to determine the channel uncertainty for the relay monitoring circuit. The channel uncertainty (CU) is then used to determine each relay setpoint.
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i, MCC-1381.05-00-0094 Originated:
a<h/
Date: _ dTf4///
Checked:
47M4 Date: Nh d-/94-Page: '1 Maximum Channel Uncertainty VT Accuracy (PM) = 10.3% of the indicated voltage. The pickup and dropout setpoints will be in the range of 91 to 107 V, so i0.3% difference is 91 x 0.003 = 10.270V 107 x 0.003 = 10.321V Therefore the higher number, iO.321V, will be used.
Test Instrument (MTE) = 10.5%, based on the tolerance of the digital volt meters presently used. The highest setpoint will be approximately 107 V, so 107 x 0.005 = i0.535V Setting Accuracy = 2% of the pickup and dropout settings, this value can be corrected at calibration and is not included in the uncertainty calculation.
Constant Voltage and Temperature Accuracy (OV) = 10.1% of the pickup and dropout settings, which is converted to volts 107 x 0.001= 0.107V 3
Voltage Changes Accuracy (VV) = i0.1% of the pickup and dropout settings, which is converted to volts 107 x 0.00l= 0.107V Temperature Changes Accuracy (TV) = 10.2% of the pickup and dropout settings, based on temperature range 0 to 40 degrees C. HVAC calculation (MCC-1211.00-00-0042, App G, Rev 26) confirms maximum temperature less than 40 degrees C.
107 x 0.002= 0.214V Seismic = 0%, Per discussions with the manufacturer, settings will not change as a result of a seismic event because the pins will not dislodge and because the potentiometers have a low mass and require a high torque to turn.
Radiation = 0%, Relays will be located in a mild environment.
1 Relay Drift (RD) = Comparing the calculated drift to the actual drift recorded in a similar 1
application, a small margin should be included to avoid setpoint tolerances which are too small.
RD = 0.04V i
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i MCC-1381.05-00-0094 Originated:
add Date:
- /&/rd Checked:
4 711'I Date:
Nll4 N 4-Page : 9 t
By increasing the calculated drift by 0.04V the drift (rounded down to the nearest tenth) will increase by one tenth. See drift calculation later in section.
All identified terms are classified as Random Independent except for the Setting Accuracy.
Setting Accuracy is Nonrandom Correction and can be ignored because it is corrected by calibration.
Channel Uncertainty Calculation CU = i( PM' + MTE' + OV' + VV' + TV' )" + RD CU = i( 0.32l' + 0.535' + 0.107' + 0.107' + 0.214' )" + 0.04
( Volts)
CU = 10.68 + 0.04 =
0.72V =
- 0.8V Since the CU is rounded up to the nearest tenth of a volt, RD could be increased up to 0.12V without changing the CU. This will not increase the calculated drift (determined later), so using the minimum will serve the same purpose.
Unit 1 Degraded Grid Voltage (DGV) Relay Setpoint NOTE: The term ' pickup' for a 27N relay refers to the reset value and the term
)
' dropout' refers to the point where the relay will operate. In contrast, the term ' pickup' for a 27D relay means the voltage where the relay will operate, indicating a loss of voltage.
Based on the degraded grid calculation (MCC-1381.05-00-0098, Rev 5), the ideal dropout setpoint is given as 0.8800pu (4.16KV base). The actual setpoint should be set above this point by an amount equal to the channel uncenainty.
The ideal dropout setpoint must be converted to the equivalent 120V base relay setting across the VT ratio,4200/120.
Ideal Dropout Setpoint = (0.8800 x 4160) x (120/4200) = 104.6V Actual Setpoint (dropout) = 104.6 + 0.8 = 105.4V therefore, due to CU the setpoint could vary in the range dropout + CU = 105.4 + 0.8 = 106.2V i
dropout - CU = 105.4 - 0.8 = 104.6V The ideal Dropout Setpoint is the ALLOWABLE VALUE that is noted in the Technical Specifications, j
I
MCC-1381.05-00-0094 Originated:
adu/
Date:
s//4/N Checked:
'7L7M Y Date: R /'t Il94-Page: 9 The above calculation indicates the DGV relays should be set to dropout at 105.4V to prevent unnecessary actuation. The manufacturer recommends a minimum difference between pickup and dropout, deadband, of 0.5% or 0.53V ( = 0.6V ). The minimum deadband is chosen to make the reset point as low as possible. The pickup setpoint should be determined by the following equation:
pickup = dropout + deadband pickup = 105.4 + 0.6 pickup = 106.0V therefore, due to CU the setpoint could vary in the range pickup + CU = 106.0 + 0.8 = 106.8V pickup - CU = 106.0 - 0.8 = 105.2V The relay shall be set as follows:
DROPOUT TAP: 99%, 105.4Vi0.0V PICKUP TAP: 110V, 106.0ViO.0V 3
The setting tolerances are i0.0V so that the relays will be set to exactly the proper setpoints.
When the setpoint is examined after setting the relay or for calibration check, it may drift. If the dropout setting is found lower, it is not a concern as long as the dropout is above the minimum setting calculated below:
Drift associated with the relay DRIFT = i( OV' + VV' + TV' )* + RD DRIFT = i (0.107' + 0.107' + 0.214')" + 0.04 DRIFT a 0.25 + 0.04 = i 0.3V Minimum Acceptable Dropout
= Actual Dropout Setpoint - DRIFT
= 105.4 - 0.3
= 105.IV The Minimum Acceptable Dropout value is the TRIP SETPOINT that appears in the Technical Specifications. This value shall be conveyed to IAE.
l
MCC-1381.05-00-0094 Originated:
44f/
Date:
f/E.///
Checked:
M~Wi-4 Date:
5//4 / 94-Page: /o Although the setpoint has no setting tolerance, do.2 is an allowable range for setpoint drift.
If the relay setpoint drift is greater than 0.2V and less than 0.3V a calibration is required.
This philosophy is expanded below in Table 2.
TABLE 2 Setpoint Action 105.2 s setpoint 5105.6 No Re-calibration Required 105.6 ( setpoint 5105.7 Calibration Required or 105.1 s setpoint ( 105.2 Calibration Required setpoint > 105.7 Calibration Required, Notify Engineering or setpoint < 105.1 Calibration Required, Notify Engineering 3
MCC-1381.05 00-0094 Originated:
ads Date: f//4/6/
Checked:
M7MY Date:. P//4/.11 Page : 11 Unit 1 Associated Bus Voltages i
The following sections provide expected 4KV and switchyard voltages for the various operating points for the relays. This can provide information for other McGuire calculations or for Power Delivery Department calculations.
4KV Bus Voltages The 4KV bus voltages can be calculated for each setpoint and tolerance as follows:
4KV Bus Voltages for LOV pickup = 90.7 x (4200/120) = 3175V pickup + CU = 92.2 x (4200/120) = 3227V pickup - CU =89.2 x (4200/120) = 3122V reset = 93.4 x (4200/120) = 3269V reset + CU = 94.9 x (4200/120) = 3322V reset - CU = 91.9 x (4200/120) = 3217V I
4KV Bus Voltages for DGV dropout = 105.4 x (4200/120) = 3689V i
dropout + CU = 106.2 x (4200/120) = 3717V dropout - CU = 104.6 x (4200/120) = 3661V pickup = 106.0 x (4200/120) = 3710V pickup + CU = 106.8 x (4200/120) = 3738V pickup - CU = 105.2 x (4200/120) = 3682V Switchyard Bus Voltages i
Based on the information from the degraded grid calculation, the expected switchyard voltages for pickup and dropout can be estimated.
One Circuit (MCC-1381.05-00-98, Table 3)
A 230KV switchyard voltage of 0.9696pu will provide 0.8800pu on the 4.16KV bus, I
therefore the ratio of 230KV to 4.16KV voltages is 230KV bus voltage / 4.16KV bus voltage = 0.9696 / 0.8800 = 1.102
- (
MCC-1381.05-00-0094 l
Originated:
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Date:
- //4//v l
Elfi-)')d.
l Checked:
%7h4 Date:
Page : 12 l
f i
Both Circuits (MCC-1381.05-00-98, Table 6) l A 230KV switchyard voltage of 0.9365pu will provide 0.8800pu on the 4.16KV bus,.
therefore the ratio of 230KV to 4.16KV voltages is 230KV bus voltage / 4.16KV bus voltage = 0.9365 / 0.8800 = 1.064 l
l Switchyard voltages for LOV i
i One Circuit: pickup = 3175(1.102)(230KV/4.16KV) = 193.4KV
^
pickup + CU = 3227(1.102)(230KV/4.16KV) = 196.6KV pickup - CU = 3122(1.102)(230KV/4.16KV) = 190.2KV l
l
(
reset = 3269(1.102)(230KV/4.16KV) = 199.2KV reset + CU = 3322(1.102)(230KV/4.16KV) = 202.4KV reset - CU = 3217(1.102)(230KV/4.16KV) = 196.0KV
.I Both Circuits: dropout = 3175(1.064)(230KV/4.16KV) = 186.8KV l
dropout + CU = 3227(1.064)(230KV/4.16KV) = 189.8KV dropout - CU = 3122(1.064)(230KV/4.16KV) = 183.7KV l
].
pickup = 3269(1.064)(230KV/4.16KV) = 192.3KV f
pickup + CU = 3322(1.064)(230KV/4.16KV) = 195.4KV pickup - CU = 3217(1.064)(230KV/4.16KV) = 189.2KV l
l Switchyard voltages for DGV I
One Circuit: dropout = 3689(1.102)(230KV/4.16KV) = 224.8KV dropout + CU = 3717().102)(230KV/4.16KV) = 226.5KV dropout - CU = 3661(l.102)(230KV/4.16KV) = 223.1KV pickup = 3710(1.102)(230KV/4.16KV) = 226.0KV pickup + CU = 3738(1.102)(230KV/4.16KV) = 227.7KV pickup - CU = 3682(1.102)(230KV/4.16KV) = 224.3KV j
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MCC 1381.05-00-0094
' Originated:
S/o/
Date:
d/4 /r</
Checked:
TW Date: N/II/G4 Page : 13 Both Circuits: dropout = 3689(1.064)(230KV/4.16KV) = 217.0KV
-i dropout + CU = 3717(1.064)(230KV/4.16KV) = 218.7KV dropout - CU = 3661(1.064)(230KV/4.16KV) = 215.4KV pickup = 3710(l.064)(230KV/4.16KV) = 218.2KV pickup + CU = 3738(1.064)(230KV/4.16KV) = 219.9KV l
pickup - CU = 3682(l.064)(230KV/4.16KV) = 216.6KV i
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MCC-1381.05-00-0094 Originated:
/2%/ ~
Date:
M/4/pv' i
Checked:
TM Date:
'F//4/94 -
Page : M Unit l' Loss of Voltage Time Delav Relays 4
j i
TIME DELAY RELAYS:
LTI A, LTIB L
a ASSOCIATED RELAYS:
127XA,127YA,127ZA, 127XB,127YB,127ZB i
RELAY SETTING SHEETS:MCRS-0114-00.05, MCRS-0114-00.32 l
TAC:
t MCTC-114-EQB.S002-01 MANUFACTURER:
Cutler-Hammer RELAY TYPE:
D87X i
CATALOG NUMBER:
D87XEL30 l
TIME DELAY:
- 0.3 - 30 Seconds, Delay On The LOV time delay should be sufficient to not allow voltage transients to activate the trip logic. Since the dropout setpoint is set below the minimum voltage during a RCP start, the 5
time delay is not required to be equal to the starting time. However, the time delay does l
need to allow the voltage to recover to the pickup setpoint if the relay is actuated. Also,_
)
other transients such as the 6.9KV bus transfers and the clearing of faults could cause the i
. relay to dropout if a time delay is not used. The current time delay of 7.8 seconds is i
adequate to cover applicable events.
l The relay shall be set as follows:
l j
TIME DELAY: 7.8 Seconds i
t 4 -
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MCC 1381.05-00-0094 2
Originated:
az:w Date:
- 44M Checked:
Vl7F?Y Date: E/ISh4 Page : 15" Unit 1 Degraded Voltage Alarm Time Delay Relays TIME DELAY RELAYS:
162TAl,162TB1 l
ASSOCIATED RELAYS:
127DXA,127DYA,127DZA, 127DXB,127DYB,127DZB RELAY SETTING SHEET: MCRS-0114-00.55, MCRS-0114-00.57 TAC:
MCTC-114-EQB.S007-01 MANUFACTURER:
AGASTAT i
RELAY TYPE:
SSC i
CATALOG NUMBER:
SSCl2AFA TIME DELAY:
6 - 180 seconds, Delay On ACCURACY:
5.25 %
REPEATABILITY:
i 1% + 0.004 seconds i
This time delay relay is used to ensure a sustained undervoltage exists. The duration is based 3
on the longest acceleration time for any safety related motor. The AFW pump motor requires the longest acceleration time (pg24) of approximately 9 seconds at 80% voltage (>80%'is available to the motor). This time is extended to account for the timer accuracy.
i To ensure the time delay exceeds the 9 second requirement, the relay tolerance and repeatability will be considered. Since 9 seconds is the minimum limit, all uncertainties will
]
be considered negative.
Accuracy = The actual time delay can vary from the original setting by the stated accuracy.
The uncertainty for accuracy can be calculated by the following equation:
U = 9 x 0.0525 4
U = 0.47 seconds 3
Repeatability = The repeatability of any given time delay can vary by the stated value and is calculated below.
U = (9 x 0.01) + 0.004 n
Un = 0.09 seconds i
4 MCC-1381.05-00-0094 Originated:
age Date:
f//4//v Checked:
M7 fly Date:
F//4/94 Page : 16 The total negative uncertainty is the sum of the accuracy and repeatability U = U + U = 0.56 seconds A
n setting - U 2 minimum time setting - 0.56 2 9 min. setting = 9 + 0.56 min. setting = 9.56 seconds Based on the drift being approximately equivalent to the accuracy, the relay setpoint can be expected to move i 0.5 second between calibrations. Therefore, set the relay slightly above th; neuimum setting and allow 10.5 second movement between calibrations.
When this relay reaches the end of the timing cycle, it will energize to provide an annunciator alarm and a permissive to trip the bus if a Safety Injection were to occur.
The relay shall be set as follows:
)
TIME DELAY: 9.7 Seconds W
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V lJ MCC-1381.05-00-0094 Originated: a t4<>
Date: _f/)1/fv Checked:
M70Y Date:
R/G /97-l Page : 17 i
Unit 1 Degraded Voltage Trip Time Delay Relays T'ME DELAY RELAYS:
162TA2,162TB2 i
ASSOCIATED RELAYS:
127DXA,127DYA,127DZA, 127DXB,127DYB,127DZB RELAY SETTING SHEET: MCRS-0114-00.56, MCRS-0114-00.58 TAC:
MCTC-114-EQB.S008-01 MANUFACTURER:
AGASTAT RELAY TYPE:
SCC CATALOG NUMBER:
SCCLA012XXAMXA TIME DELAY:
0.5 - 15 minutes, Delay On ACCURACY:
i2%
[
REPEATABILITY:
i 0.5% + 0.004 seconds j
This time delay relay determines how long the plant will operate at the degraded voltage l
setpoint. This time limit acknowledges that loads cannot be operated continuously below the 2
dropout setpoint and gives the operator time to improve voltage before transferring to the alternate source.
The chosen time delay is 600 seconds (10 minutes). To prevent the time delay from exceeding the 600 second limit, the relay tolerance and repeatability will be considered.
Since 600 seconds is the maximum limit, all tolerances will be considered positive.
i I
Accuracy = The actual time delay can vary from the original setting by the stated tolerance.
The uncertainty for accuracy can be calculated by the following equation:
i U = 600 x 0.02 l
3 U = 12 seconds 4
Repeatability = The repeatability of any given time delay can vary by the stated value and is-calculated below.
[
Ua = (600 x 0.005) + 0.004 l
Un = 3 seconds I
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I 7
MCC-1381.05-00-0094 Originated: Oh Date: f//684/-
Checked:
TWY Date:
7/[V-/94-Page: ll L
The total positive uncertainty is the sum of the accuracy and repeatability-l U = U + Un = 15 seconds j
3 setting + U $ maximum time i
setting + 15 5 600 t
max. setting = 600 - 15 l
. max. setting = 585 seconds l
Based on the drift being approximately equivalent to the accuracy, the relay setpoint can be expected to move i 12 seconds between calibrations. Therefore, set the relay slightly below the maximum setting and allow il2 seconds movement between calibrations.
Part of the McGuire design philosophy is to provide IE motor loads with long time
[
overcurrent protection set to 150% of the rated full load amperes. The time delay above provides enough margin to allow motors to operate during this time.
The relay shall be set as follows:
9 TIME DELAi s82 Seconds
=.n
.r.
MCC-1381.05-00-0094 i
Originated: zztu/
Date: 5/5//r$'
Checked: M Date: '4-6-95 i
Page : 14 I
UNIT 2 LOSS OF VOLTAGE RELAY (27) SETTING l
LOSS OF VOLTAGE RELAYS:
227XA,227YA,227ZA, 227XB,227YB,227ZB r
BUSES MONITORED:
2 ETA,2ETB i
RELAY TYPE:
ITE-27D CATALOG NUMBER:
211R6175 PICKUP RANGE:
60 - 110V DROPOUT RANGE:
Not Adjustable, approximately 3% above pickup TIME DELAY:
0.1 - 1 Second INSTRUCTION BOOK:
IB-18.4.7-2, Issue E j
VT RATIO:
4200/120V The 27 relays are used in a two-out-of-three logic scheme to detect a loss of cffsite power condition and initiate separation of the essential switchgear from the normal power supply. The
)
timer associated with the relays (discussed later) provides the necessary delay to assure that there is a loss of voltage condition.
This is the first level of a two level scheme and its purpose is to monitor for a loss of voltage condition. This setpoint is designed to allow the staning of safety and non-safety motor loads with only one offsite circuit available. The second level is discussed in the next section, Degraded Grid Voltage Relay.
t The following calculation uses ISA-S67.04, "Setpoints for Nuclear Safety-Related j
Instrumentation Used in Nuclear Plants," to determine the channel uncertainty for the relay monitoring circuit. The channel uncertainty (CU) is then used to determine each relay setpoint.
i Maximum Channel Uncertainty Each te-rm considered in the CU equation is described below along with the basis for the value assigned.
I VT Accuracy (PM) = 0.3% of the indicated voltage. The pickup setpoint will be approximately 91V (expected pickup setpoint), so 0.3% difference is 91 x 0.003 = 10.273V i
9 MCC-1381.05-00-0094 Originated: 4%/
Date: _5/5//F Checked: ty Date: 4-rf-6 Page:lo Test Instrument (MTE) = 10.5%, based on the accuracy of the digital volt meters presently used.
The highest setpoint will be approximately 91 V, so 91 x 0.005 = 0.455V Setting Accuracy = 5% of the pickup setting, this value can be corrected at calibration and is not included in the uncertainty calculation.
Constant Voltage and Temperature Accuracy (OV) = Not provided in relay instruction book.
Considered negligible with the other tolerances, since calibration to the setpoint will be performed.
Voltage Changes Accuracy (VV) = 0.2V for a 10V variation. Based on a 30V battery voltage variation (=105V - 132V) 0.2/10V x 30V = 0.6V Temperature Changes Accuracy (TV) = 0.5V, based on temperature range 20 to 40 degrees C.
HVAC calculation (MCC-1211.00-00-0042, App G, Rev 26) confirms maximum temperature less than 40 degrees C.
Seismic = 0%, Settings will not change as a result of a seismic event.
2 Radiation = 0%, Relays will be located in a mild environment.
Relay Drift (RD) = Comparing the calculated drift to the actual drift (obtained from IAE data) indicates that more margin should be included to avoid setpoint tolerances which are too small.
RD = 0.5V All terms identified above are classified as Random Independent except for Relay Drift which is a bias.
Loss of Voltage Channel Uncertainty Calculation CU = ( PM' + MTE' + VV' + TV' )" + RD CU= ( 0.273' + 0.455' + 0.6' + 0.5' )" + 0.5
( Volts)
CU= 0.94 + 0.5 = 1.4V l
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MCC-1381.05-00-0094 Originated: az'u/
Date: #5//r.5" Checked: h ttp Date: el-r s-9 s-Page :.2 /
Unit 2 Loss Of Voltage (LOV) Relay Setpoint NOTfh The term ' pickup' for a 27D relay refers to the voltage where the relay will operate to indicate a loss of voltage. In contrast, the term ' pickup' for a 27N relay refers to the reset value.
Based on the degraded grid calculation (MCC-1381.05-00-0135, Rev 3), the ideal pickup setpoint is given as 0.7704pu (4.16KV base). The actual pickup setpoint should be set below this point by an amount equal to the channel uncertainty to prevent unnecessary actuation.
The ideal pickup setpoint must be converted to the equivalent 120V base relay setting across the VT ratio,4200/120.
Ideal Setpoint = (0.7704 x 4160) x (120/4200) = 91.6V Actual Setpoint (pickup) = 91.6 - 1.4 = 90.2V therefore, due to CU the setpoint could vary in the range pickup + CU = 90.2 + 1.4 = 91.6V 5
pickup - CU = 90.2 - 1.4 = 88.8V The Ideal Setpoint value is the ALLOWABLE VALUE number that is noted in the Technical Specifications.
The above calculation indicates the LOV relays should be set to pickup at 90.2V to prevent unnecessary actuation. The difference between pickup and dropout, deadband, is approximately 3.0% or 2.73V (3% of 91V setting) and is not adjustable. The reset point should be estimated by the following equation:
reset = pickup x percent deadband reset = 90.2 x 1.03 reset = 92.9V therefore, due to CU the setpoint could vary in the range reset + CU = 92.9 + 1.4 = 94.3V reset - CU = 92.9 - 1.4 = 91.5V The time delay should remain set to 10 cycles to prevent false diesel starting during brief system transients.
MCC-1381.05-00-0094 Originated:
42h/
Date: 5/S//fr Checked: M Date: 4-#f-9f Page:@
The relay shall be set as follows:
PICKUP TAP: 90V PICKUP VOLTAGE: 90.2V *0.0V TIME DELAY: 10 Cycles,0.167 see Tb ectting tolerance is 10.0V so that the relays will be set to exactly the proper setpoint.
However, when the setpoint is examined after setting the relay or for calibration check it may drift by the amount described below.
Drift associated with the relay DRIFT = 1( VV' + TV' )* +RD DRIFT = ( 0.6' + 0.5' )" + 0.5 DRIFT = 0.8 + 0.5 = 11.3V Maximum Acceptable Pickup for calibration purposes including tolerances.
= Actual Pickup Setpoint + DRIFT
= 90.2 + 1.3
= 91.5V The Maximum Acceptable Pickup value is the TRIP SETPOINT value that is noted in the Technical Specifications. This value shall be conveyed to IAE.
Although the pickup setpoint has 0.0V setting tolerance,10.8 is an expected range for setpoint drift. If the relay setpoint drift is greater than 0.8V and less than 1.3V a calibration is required.
If the relay were to drift more than 1.3V, Engineering should be notified and the relay re-calibrated. This philosophy is expanded below in Tablel.
i
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MCC-1381.05-00-0094 Originated: /1m/
Date: 3/S//fs :
' Checked: -xnnL Date: % f>-95 l
Page : 23 TABLE 1 Setpoint Action r
89.4 s setpoint s 91.0 No Re-calibration Required j
i 91.0 < setpoint s 91.5 Calibration Required
'{
or 88.9 s setpoint < 89.4 Calibration Require'd setpoint > 91.5 Calibration Required, Notify Engineering or setpoint < 88.9 Calibration Required, Notify Engineering f
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I 1
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A MCC-1381.05-00-0094 Originated: 6 % t/
Date: 5/5//rr" Checked: hh Date: a-d-95 Page :.2 9 UNIT 2 DEGRADED GRID VOLTAGE REL AY (27D) SETTING DEGRADED GRID VOLTAGE RELAYS:
227DZA,227DYA,227DXA, 227DZB,227DYB,227DXB BUSES MONITORED:
2 ETA,2ETB RELAY TYPE:
ITE-27N, High Accuracy Relay CATALOG NUMBER:
411T0375 PICKUP RANGE:
70 - 120V DROPOUT RANGE:
70% -p9%
TIME DELAY:
Instantaneous Pickup and Dropout INSTRUCTION BOOK:
IB-7.4.1.7-7, Issue D VT RATIO:
4200/120V The 27 relays are used in a two-out-of-three logic scheme to detect a degraded voltage condition and initiate separation of the essential switchgear from the normal power source. Timers are also associated with these relays to provide the necessary time delay to verify there is a degraded voltage condition. The degraded voltage relaying is considered the second level of protection.
Once an undervoltage condition is detected, two timers begin timing to verify the event is a sustained degraded voltage condition. If the first timer (62A) completes its cycle, an alarm will be initiated in the control room. The second timer (62T) is provided to allow extra time after the first time delay for the operators to improve voltage. If the undervoltage condition is still present when the second timing cycle is complete, a blackout will be initiated on that train by opening the 4KV incoming circuit break.er. Should a Safety Injection signal occur at any time after the first timer completes its cycle, the circuit will automatically initiate separation from the offsite power source and transfer to the emergency diesel generators.
The following calculation uses ISA-S67.04, "Setpoints for Nuclear Safety-Related Instrumentation Used in Nuclear Plants," to determine the channel uncertainty for the relay monitoring circuit. The channel uncenainty (CU) is then used to determine each relay setpoint.
MCC-1381.05-00-0094 Originated:
<@w/
Date: MS//Er Checked: M Date:
'#- th 4 5 Page T Maximum Channel Uncertainty VT Accuracy (PM) = *0.3% of the indicated voltage. The pickup and dropout setpoints will be in the range of 91 to 107 V, so 10.3% difference is 91 x 0.003 = i0.273V 107 x 0.003 = 10.321V Therefore the higher number,10.321V, will be used.
Test Instrument (MTE) = 0.5%, based on the tolerance of the digital volt meters presently used.
The highest setpoint will be approximately 107 V, so 107 x 0.005 = 10.535V Setting Accuracy = i2% of the pickup and dropout settings, this value can be corrected at calibration and is not included in the uncenainty calculation.
Constant Voltage and Temperature Accuracy (OV) = 10.1% of the pickup and dropoet settings, which is converted to volts 107 x 0.001= 0.107V Voltage Changes Accuracy (VV) = 10.1% of the pickup and dropout settings, which is converted to volts
)
107 x 0.00l= 0.107V Temperature Changes Accuracy (TV) = 0.2% of the pickup and dropout settings, based on temperature range 0 to 40 degrees C. HVAC calculation (MCC-1211.00-004)042, App G, Rev 26) confirms maximum temperature less than 40 degrees C.
107 x 0.002= 0.214V Seismic = 0%, Per discussions with the manufacturer, settings will not change as a result of a seismic event because the pins will not dislodge and because the potentiometers have a low mass and require a high torque to turn.
Radiation = 0%, Relays will be located in a mild environment.
1 Relay Drift (RD) = Comparing the calculated drift to the actual drift recorded in a similar application, a small margin should be included to avoid setpoint tolerances which are too small.
RD = 0.04V By increasing the calculated drift by 0.04V the drift (rounded down to the nearest tenth) will increase by one tenth. See drift calculation later in section.
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l MCC-1381.05-00-0094 l
Originated: 4%/
Date: 5/s//f3-Checked: hh Date: 4-6-96 Page: X j
All identified terms are classified as Random Independent except for the Setting Accuracy.
Setting Accuracy is Nonrandom Correction and can be ignored because it is corrected by calibration.
Channel Uncertainty Calculation e
CU = 1( PM* + MTE' + OV' + VV' + TV' )" + RD CU = i( 0.321' + 0.535' + 0.107' + 0.107' + 0.214' )" + 0.04
( Volts)
CU = *0.68 + 0.04 = 0.72V = 0.8V Since the CU is rounded up to the nearest tenth of a volt, RD could be increased up to 0.12V without changing the CU. This will not increase the calculated drift (determined later), so using the minimum will serve the same purpose.
l Unit 2 Degraded Grid Voltage (DGV) Relay Setooint NOTE: The term ' pickup' for a 27N relay refers to the reset value and the term ' dropout'
[
referr. to the point where the relay will operate. In contrast, the term ' pickup' for a 27D relay means the voltage where the relay will operate, indicating a loss of voltage.
)
1 Based on the degraded grid calculation (MCC-1381.05-00-0135, Rev 3), the ideal dropout setpoint is given as 0.8859pu (4.16KV base). The actual setpoint should be set above this point
[
by an amount equal to the channel uncertainty.
i The ideal dropout setpoint must be converted to the equivalent 120V base relay setting across the VT ratio,4200/120.
Ideal Dropout Setpoint = (0.8859 x 4160) x (120/4200) = 105.3V i
Actual Setpoint (dropout) = 105.3 + 0.8 = 106.1V i
I therefore, due to CU the setpoint could vary in the range dropout + CU = 106.1 + 0.8 = 106.9V dropout - CU = 106.1 - 0.8 = 105.3V The Ideal Dropout Setpoint is the ALLOWABLE VALUE that is noted in the Technical Specifications.
The above calculation indicates the DGV relays should be set to drop out at 106.IV to prevent l
unnecessary actuation. The manufacturer recommends a minimum difference between pickup
{
I 1
v^
^
MCC-1381.05-00-0094 Originated:
- du/
Date: 5/Idff Checked: M Date: &- d -95 Page:'Z~7 and dropout, deadband, of 0.5% or 0.53V ( = 0.6V ). The minimum deadband is chosen to make
. the reset point as low as possible. The pickup setpoint should be determined by the following equation:
pickup = dropout + deadband pickup = 106.1 + 0.6 pickup = 106.7V therefore, due to CU the setpoint could vary in the range pickup + CU = 106.7 + 0.8 = 107.5V pickup - CU = 106.7 - 0.8 = 105.9V The relay shall be set as follows:
DROPOUT TAP: 99%,106.lVi0.0V PICKUP TAP: 110V,106.7V10.0V The setting tolerances are 0.0V so that the relays will be set to exactly the proper setpoints.
When the setpoint is examined after setting the relay or for calibration check,it may drift. If the dropout setting is found lower, it is not a concern as long as the dropout is above the minimum setting calculated below:
Drift associated with the relay DRIFT = 1( OV' + VV' + TV')" + RD DRIFT = 1 (0.107' + 0.107' + 0.214')* + 0.04 -
DRIFT = 0.26 + 0.04 -10.3V Minimum Acceptable Dropout
= Actual Dropout Setpoint - DRIFI'
= 106.1 - 0.3
= 105.8V The Minimum Acceptable Dropout value is the TRIP SETPOINT that appears in the Technical
[
Specifications. This value shall be conveyed to IAE.
{
Although the setpoint has no setting tolerance, 0.2 is an allowable range for setpoint drift. If
[
the relay setpoint drift is greater than 0.2V and less than 0.3V a calibration is required. This philosophy is expanded below in Table 2.
(
l
.o.'
i i
MCC-1381.05-00-0094 I
Originated: a.e /
Date: 5/7///I I
Checked: M Date: 4-ik -95 Page:28 l
TABLE 2 Setpoint Action l
105.9 5 setpoint s 106.3 No Re-calibration Required 106.3 < setpoint s 106.4 Calibration Required l
or 105.8 5 setpoint < 105.9 Calibration Required setpoint > 106.4 Calibration Required, Notify Engineering or setpoint < 105.8 Calibration Required, Notify Engineering
)
MCC-1381.05-00-0094 Originated:
ocu/
Date: 5/S//rf Checked: hh Date: 4-6 -45 Page: 24 Unit 2 Associated Bus Voltages The following sections provide expected 4KV and switchyard voltages for the various operating points for the relays. This can provide information for other McGuire calculations or for Power Delivery Department calculations.
4KV Bus Voltages The 4KV bus voltages can be calculated for each setpoint and tolerance as follows:
4KV Bus Voltages for LOV pickup = 90.2 x (4200/120) = 3157V pickup + CU = 91.6 x (4200/120) = 3206V pickup - CU =88.8 x (4200/120) = 3108V reset = 92.9 x (4200/120) = 3252V reset + CU = 94.3 x (4200/120) = 3301V reset - CU = 91.5 x (4200/120) = 3203V 4KV Bus Voltages for DGV
)
dropout = 106.1 x (4200/120) = 3714V dropout + CU = 106.9 x (4200/120) = 3742V dropout - CU = 105.3 x (4200/120) = 3686V pickup = 106.7 x (4200/120) = 3735V pickup + CU = 107.5 x (4200/120) = 3763V pickup - CU = 105.9 x (4200/120) = 3707V Switchyard Bus Voltages Based on the information from the degraded grid calculation, the expected switchyard voltages for pickup and dropout can be estimated.
One Circuit (MCC-1381.05-00-0135)
A 525KV switchyard voltage of 0.9616pu will provide 0.8859pu on the 4.16KV bus, therefore the ratio of 525KV to 4.16KV voltage is 525KV bus voltage / 4.16KV bus voltage = 0.9616 / 0.8859 = 1.085 i
l
e MCC-1381.05-00-0094 Originated:
e24d Date: J/3/ArS' f
Checked: Q Date: 4-/4-95 l
Page : So Both Circuits (MCC-1381.05-00-0135) l A 525KV switchyard voltage of 0.9192pu will provide 0.8859pu on the 4.16KV bus, therefore the ratio of 525KV to 4.16KV voltage is 525KV bus voltage / 4.16KV bus voltage = 0.9192 / 0.8859 = 1.038 i
Switchyard voltages for LOV One Circuit: pickup = 3157(1.085)(525KV/4.16KV) = 432.3KV pickup + CU = 3206(l.085)(525KV/4.16KV) = 439.0KV pickup - CU = 3108(l.085)(525KV/4.16KV) = 425.6KV reset = 3252(1.085)(525KV/4.16KV) = 445.3KV reset + CU = 3301(1.085)(525KV/4.16KV) = 452.0KV reset - CU = 3203(1.085)(525KV/4.16KV) = 438.6KV Both Circuits: dropout = 3157(1.038)(525KV/4.16KV) = 413.6KV dropout + CU = 3206(1.038)(525KV/4.16KV) u 420.0KV dropout - CU = 3108(l.038)(525KV/4.16KVJ = 407.1KV
~
I pickup = 3252(1.038)(525KV/4.16KV) = 426.0KV pickup + CU = 3301(1.038)(525KV/4.16KV) = 432.4KV pickup - CU = 3203(l.038)(525KV/4.16KV) = 419.6KV i
Switchyard voltages for DGV i
One Circuit: dropout = 3714(1.085)(525KV/4.16KV) = 508.6KV dropout + CU = 3742(1.085)(525KV/4.16KV) = 512.4KV j
dropout - CU = 3686(1.085)(525KV/4.16KV) = 504.7KV pickup = 3735(l.085)(525KV/4.16KV) = 511.4KV pickup + CU = 3763(l.085)(525KV/4.16KV) = 515.3KV i
pickup - CU = 3707(l.085)(525KV/4.16KV) = 507.6KV f
l
MCC-1381.05-00-0094 Originated:
t:Zd4/
Date: 3/5//fy Checked: ffh Date:
4-f)-96 Page : SI Both Circuits: dropout = 3714(l.038)(525KV/4.16KV) = 486.5KV
.l dropout + CU = 3742(1.038)(525KV/4.16KV) = 490.2KV dropout - CU = 3686(1.038)(525KV/4.16KV) = 482.9KV e
pickup = 3735(l.038)(525KV/4.16KV) = 489.3KV pickup + CU = 3763(1.038)(525KV/4.16KV) = 492.9KV j
pickup - CU = 3707(1.038)(525KV/4.16KV) = 485.6KV l
i i
}'
l l
MCC 1381.05-00-0094 Originated: h Date:.3/3//f5 I
Checked: //m_k Date: 4-s)-95 i
Page: 32 Unit 2 Loss of Voltage Time Delay Relays i
I TIME DELAY RELAYS:
LT2A,LT2B-ASSOCIATED RELAYS:
227XA,227YA,227ZA, 227XB,227YB,227ZB TAC:
MCTC-114-EQB.S002-01 MANUFACTURER:
CUTLER-HAMMER RELAY TYPE:
D87X CATALOG NUMBER:
D87XEL30 TIME DELAY:
0.3 - 30 Seconds, Delay On The LOV time delay should be sufficient to not allow voltage transients to activate the trip logic.
Since the dropout setpoint is set below the minimum voltage during a RCP start, the time delay
{
is not required to be equal to the starting time. However, the time delay does need to allow the voltage to recover to the pickup setpoint if the relay is actuated. Also, other transients such as the 6.9KV bus transfers and the clearing of faults could cause the relay to dropout if a time delay 7
is not used. The current time delay of 7.8 seconds is adequate to cover applicable events.
The relay shall be set as follows:
i TIME DELAY: 7.8 Seconds l
)
i
- MCC-1381.05-00-0094 Originated:
42ca/
Date: 5/5//0~
Checked: -Mut Date: 4-/5-96 Page : 33
- Unit 2 Degraded Voltage Alarm Time Delay Relays TIME DELAY RELAYS:
262TA1,262TB1 ASSOCIATED RELAYS:
227DXA,227DYA,227DZA, 227DXB,227DYB,227DZB TAC:
MCFC-114-EQB.5007-01 MANUFACTURER:
AGASTAT RELAY TYPE:
SSC CATALOG NUMBER:
SSC12AFA TIME DELAY:
6 - 180 seconds, Delay On ACCURACY:
- 5.25%
REPEATABILITY:
1% + 0.004 seconds This time delay relay is used to ensure a sustained undervoltage exists. The duration is based.on the longest acceleration time for any safety related motor. The AFW pump motor requires the longest acceleration time (pg24) of approximately 9 seconds at 80% voltage (>80% is available~
to the motor). This time is extended to account for the timer accuracy.
To ensure the time delay exceeds the 9 second requirement, the relay tolerance and repeatability-will be considered. Since 9 seconds is the minimum limit, all uncertainties will be considered negative.
Accuracy = The actual time delay can vary from the original setting by the stated accuracy. The uncertainty for accuracy can be calculated by the following equation:
U, = 9 x 0.0525 U, = 0.47 seconds Repeatability = The repeatability of any given time delay can vany by the stated value and is calculated below.
U, = (9 x 0.01) + 0.004 U, = 0.09 seconds The total negative uncertainty is the sum of the accuracy and repeatability l
l
.4 MCC-1381.05-00-0094 Originated: am/
Date:.5/5/ /rf Checked: 6xL Date: 4-/J-95 Page : 3p U = U, + U, = 0.56 seconds setting - U 2 minimum time setting - 0.56 2 9 min. setting = 9 + 0.56 min. setting = 9.56 seconds Assuming the drift being approximately equivalent to the accuracy, the relay setpoint can be expected to move 10.5 second between calibrations. Therefore, set the relay slightly above the minimum setting and allow 10.5 second movement between calibrations.
When this relay reaches the end of the timing cycle, it will energize to provide an annunciator alarm and a permissive to trip the bus if a Safety Injection were to occur.
The relay shall be set as follows:
TIME DELAY: 9.7 Seconds a
b a
MCC-1381.05-00-0094 Originated: ace /
Date: 5h//r.r Checked: hk Date: #-r 6 - 9 6 Page : 35 '
Unit 2 Degraded Voltage Trin Time Delay Relays TIME DELAY RELAYS:
262TA2,262TB2 ASSOCIATED RELAYS:
227DXA,227DYA,227DZA, 227DXB,227DYB,227DZB RELAY SETTING SHEET: MCRS-0114-00.56, MCRS-0114-00.58 TAC:
MCTC-114-EQB.S008-01 MANUFACTURER:
AGASTAT RELAY TYPE:
SCC CATALOG NUMBER:
SCCLA012XXAMXA TIME DELAY:
0.5 - 15 minutes, Delay On ACCURACY:
2%
REPEATABILITY:
10.5% + 0.004 seconds This time delay relay determines how long the plant will operate at the degraded voltage setpoint.
This time limit acknowledges that loads cannot be operated continuously below the dropout setpoint and gives the operator time to improve voltage before transferring to the alternate source.
The chosen time delay is 600 seconds (10 minutes). To prevent the time delay from exceeding the 600 second limit, the relay tolerance will be considered. Since 600 seconds is the maximum limit, all tolerances will be considered positive.
Accuracy = The actual time delay can vary from the original setting by the stated tolerance. The uncertainty for accuracy can be calculated by the following equation:
U, = 600 x 0.02 U, = 12 seconds Repeatability = The repeatability of any given time delay can vary by the stated value and is calculated below.
U, = (600 x 0.005) + 0.004 U, = 3 seconds
MCC-1381.05-00-0094 Originated: Blu>
Date: 5/n/tr 4 d-95 i
/
Checked: Mmth Date:
Page : 3f The total positive uncertainty is the sum of the accuracy and repeatability U = U, + U, = 15 seconds setting + U s maximum time setting + 15 s 600 max. setting = 600 - 15 rnax. setting = 585 seconds Assuming the drift being approximately equivalent to the accuracy, the relay sctpoint can be expected to move i 12 seconds between calibrations. Therefore, set the relay slightly below the.
maximum setting and allow 12 seconds movement between calibrations.
Part of the McGuire design philosophy is to provide IE motor loads with long time overcurrent protection set to 150% of the rated full load amperes. The time delay above provides enough margin to allow motors to operate during this time.
l i
The relay shall be set as follows:
l TIME DELAY: 582 Seconds t
ATTACHMENT 3 ELEMENTARY DIAGRAMS 1
1
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DATE CHKD. DATE APPR. DATE INSPECTED ATION BLDCX DUKE POWER COMPANY t"
MCGUIRE NUCLEAR STATION UNIT
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