ML072060651
| ML072060651 | |
| Person / Time | |
|---|---|
| Site: | San Onofre  |
| Issue date: | 07/24/2007 |
| From: | Scherer A Southern California Edison Co |
| To: | Document Control Desk, Office of Nuclear Reactor Regulation |
| References | |
| Download: ML072060651 (14) | |
Text
SOUTHERN CALIFORNIA A. Edward Scherer EDISON anager of Nuclear Regulatory Affairs An EDISON INTFRNATIONAL0 Company July 24, 2007 U. S. Nuclear Regulatory Commission Attn: Document Control Desk Washington, DC 20555-0001
Subject:
Docket Nos. 50-361 and 50-362 Response to Request for Additional Information on the Proposed License Amendment on Degraded Voltage Setpoints San Onofre Nuclear Generating Station, Units 2 and 3
References:
- 1. June 13, 2007 letter from N. Kalyanam (NRC) to Richard M.
Rosenblum (SCE),
Subject:
San Onofre Nuclear Generating Station, Units 2 and 3 - Request for Additional Information on the Proposed License Amendment on Degraded Voltage Setpoints (TAC NOS.
MD4419 AND MD4420)
- 2. February 8, 2007 letter from B. Katz (SCE) to Document Control Desk (NRC),
Subject:
San Onofre Nuclear Generating Station, Units 2 and 3, Docket Nos. 50-361 and 50-362, Proposed Change Number (PCN) -
574, Degraded Voltage Setpoints
Dear Sir or Madam:
By letter dated June 13, 2007, the Nuclear Regulatory Commission issued a request for additional information (Reference 1) regarding Proposed Change Number (PCN)-574, Degraded Voltage Setpoints (Reference 2). The enclosure provides Southern California Edison's (SCE's) response.
In Reference 2, page 3 of Enclosure 2, SCE stated "In addition, the change to Technical Specification (TS) 3.8.1 Surveillance Requirements (SRs) will allow the Diesel Generator (DG) voltage regulator to be reset closer to nominal design (4360 +/- 80 V instead of 4460 +/- 80 V)." As discussed in SCE's response to NRC Question 2 in the enclosure, the current DG voltage regulator setpoint meets the requirements of the proposed TS 3.8.1 SR limit. SCE intends to reset the voltage regulators to this new nominal value during the next DG outages of sufficient duration and not within 60 days of the proposed amendment approval stated in the cover letter of Reference 2.
P.O. Box 128 San Clemente, CA 92672 jo0 949-368-7501 Fax 949-368-7575 Le CZ_
Document Control Desk July 24, 2007 If you have any questions or require additional information, please contact Ms. Linda T.
Conklin at (949) 368-9443.
Sincerely, Enclosure cc:
B. S. Mallett, Regional Administrator, NRC Region IV N. Kalyanam, NRC Project Manager, San Onofre Units 2 and 3 C. C. Osterholtz, NRC Senior Resident Inspector, San Onofre Units 2 and 3
ENCLOSURE Response to Request for Additional Information (RAI) on the Proposed License Amendment on Degraded Voltage Setpoints NRC Question 1:
Please provide a summary or excerpt from calculation(s) based on which the revised degraded voltage setpoints have been calculated.
SCE Response:
Pages 1 through 9 of Engineering Change Notice (ECN) A47480 to SCE Calculation No.
E4C-1 30, Revision 1, TLU Calculation for Undervoltage Relay Circuits at 1 E 4kV Switchgear, are provided as Attachment 1 to this enclosure.
NRC Question 2:
Please provide confirmation that the proposed change to TS 3.8.1 SRs (4161 Volt minimum steady state voltage) will not impact the emergency diesel generator (EDG) capability to meet the requirement of Regulatory Guide 1.9, Revision 3, Section C.1.4 which pertains to the starting and load-accepting capabilities of the EDG unit.
SCE Response:
SCE Calculation E4C-082, System Dynamic Voltages during Design Basis Accident (DBA),
was issued to document that San Onofre Nuclear Generating Station (SONGS) EDGs meet the requirements of Regulatory Guide 1.9, Revision 3. Calculation Change Notice (CCN) 62 to E4C-082 confirms that SONGS EDGs with a minimum voltage regulator setpoint of 4280V still meet the requirement of Regulatory Guide 1.9, Revision 3, Section C. 1.4, which pertains to the starting and load-accepting capabilities of the EDG unit.
In order to provide voltage greater than 4161 V to the Class 1 E 4.16 kV buses, each EDG Automatic Voltage Regulator (AVR) will be set at a nominal value of 4360 V at the next EDG outage of sufficient duration. EDG output voltages are verified during EDG surveillance testing. EDG output voltages, EDG surveillance test voltages, and TS required voltage are summarized below:
Page 1 of 2
Maximum EDG Voltage Regulator Setpoint:
Nominal EDG Voltage Regulator Setpoint:
Minimum EDG Voltage Regulator Setpoint:
EDG surveillance test voltages:
Proposed TS 3.8.1 SRs:
4440 V 4360 V 4280 V 4270 V by main switchboard voltmeter or 4224 V by temporary data acquisition system recorder 4161 V The difference between the surveillance requirement and the surveillance test voltages is the accuracy of the test meter/equipment.
Page 2 of 2 to Enclosure Engineering Change Notice (ECN) A47480 to SCE Calculation No. E4C-130, Revision 1, TLU Calculation for Undervoltage Relay Circuits at 1 E 4kV Switchgear Pages 1 through 9
Southern California Edison Company PAGE TOTAL NO.
ENGINEERING CHANGE CALC NO.
ECN NO./
A47480 OF PAGES NOTICE (ECN)/CALCULATION E4C-130 PRELIM CCN NO.
37 CHANGE NOTICE (CCN)
BASE CALC. REV.
UNIT CCN CONVERSION:
CALC.
COVER PAGE REV.
SUMMARY
CHANGE 1
2 & 3 CCN NO.
CCN-I O*NO D]YES CALCULATION
SUBJECT:
TLU calc. for Undervottage Relay Circuit at Class 1E 4 KV Switchgear CALCULATION CROSS-INDEX ENGINEERING SYSTEM NUMBER/PRIMARY STATION SYSTEM 0-CLASS 0 New/Updated Index Included DESIGNATOR 1804 / PBA, PBB 11 17 Existing Index is Complete CONTROLLED PROGRAM OR I PROGRAM/DATABASE NAME(S)
VERSION/RELEASE NO.(S)
Site Programs / Procedure Impact?
DATABASE ACCORDING TO l ALSO, LISTED BELOW Ol NO [ YES, AR No. 060601441-11 S0123-XXIV-5.1 10CFRSO.59/72.48 Review:
EL PROGRAM [I DATABASE AR No. 060601441-8
- 1. BRIEF DESCRIPTION OF ECNICCN:
THIS ECN SUPERSEDES ECN A44811 TO E4C-130.
This ECN was prepared to support ECPs 060601441-5, 12, 13, & 14 which change pickup/dropout settings and dead band of the degraded voltage relays (ABB 27N relay).
Nominal relay setting (V)
Allowable value Dead band (V) tolerance (V)
Pickup Dropout tolerance
_V)
Existing 118.33 118.23 0.1
+/- 0.26 New 118.30 118.10 0.2
+/- 0.53 The new relay settings are based on the revised analytical lower limit voltage of 4100 V at 4.16 kV bus. As summarized above, the allowable value tolerance and dead band were increased. This change will facilitate the relay surveillance acceptance criteria by widening the allowable value tolerance.
The new allowable (as-found) values and as-left values are summarized in section 2.1.1 of this ECN.
This ECN recommends to revise the following documents:
- DGVS relay surveillance test procedures (refer to section 2.2.1)
- Tech. Spec. SR 3.3.7.3 (refer to section 2.2.2)
" Document DBD-S023-120 (refer to section 2.2.4)
INITIATING DOCUMENT (ECP, OTHER).
ECP #060601441-5 SITE FILE COPY Rev.
0
- 2. OTHER AFFECTED DOCUMENTS; El YES ED NO OTHER AFFECTED DOCUMENTS EXIST AND ARE IDENTIFIED ON ATTACHED FORM 26-503.
- 3. APPROVED BY:
-C:
ORIGINATOR (Print narne/sign/Slie*)
FILS (6ignature/date) 1*
Approval requires POS T EN.
"lcation Verified:
C Approval requires PQS T3EN64 Qualification Verified1\\
/.,i/ /
- nitigl Initial Bill Lennartz //1/
1/2 Z-/ 0
,-/o7 IRE (Print nasie/sfgr/date) -SgauedaeI
.ta Approval requires POS T3EN&4 Qualification Verified.-1 Initial
REFERENCE:
S0123-XXIV-7.15]
Site File Copy E4C-130
CALCULATION CROSS-INDEX Calculation No.
E4C-130 Sheet of INPUTS OUTPUTS Calc. rev.
Does the Identify output interface number and These interfacing calculations and/or Results and conclusion of the output interface calc/document responsible documents provide input to the subject subject calculation are used in calc/document FLS initials calculation, and if revised may require these interfacing calculations require CCN, ECP, TCNiRev., or and date revision of the subject calculation.
and/or documents.
Change?
tracking number.
Calc/Document No.
Rev. No.
Calc/Document No.
Rev. No.
YES / NO NCDBMEL 90042 11 90042 11 Yes ECPs 060601441-5, 12, 13, & 14 Rev. 1/
ECP 060601441-5, 12, 13, & 14 0
Tech. Spec.
196 Yes AR 050200133-2 Tech. Spec.
196 DBD-S023-120 5
Yes ECP 060601441-5 DBD-S023-120 5
E4C-098 3
Yes ECN A45187 E4C-082, ECN A44806 3
SO2-11-11.1A 2
Yes AR 060601441-11 E4C-085, ECN A44809 0
S02-11-11.1A-2 4
Yes AR 060601441-11
/
E40-090, EON A44810 4
E40-098, ECN A45187 3
E40-120, ECN A44805 2
S02-1I-11.1A 2
S02-11-11.1A-2 4
SCE 26-424 REV. 6 12/05
IREFERENCE:
S0123-XXIV-7,151
E&TS DEPARTMENT I PRELIM. CCN NO.
CALCULATION SHEET Project or ECP:
SONGS 2 & 3 Calc No.
Subject:
TLU Calc for Undervoltacqe Relay Circuits at Class 1 E 4 KV Switchgear Sheet of REV ORIGINATOR DATE IRE DATE I REV ORIGINATOR DATE IRE DATE C
0 C. B. Whittle 5/16/2005 Joshua Park 15/16/2005 a: -
1 C. B. Whittle 5/24/2005 Joshua Park 5/24/20051 I
PURPOSE 1.1 Purpose The purpose of this calculation is to perform an analysis associated with the Degraded Voltage Relays (ABB 27N) used for Degraded Voltage Protection in the 4kV Switchgears 2A04, 2A06, 3A04, and 3A06. The following analyses are performed for these relays:
A. Determine the Total Loop Uncertainty (TLU) and Allowable Value Tolerance (AVT),
B.
Determine the Nominal UV Relay Pickup (PU) and Dropout (DO) Setpoints, C. Determine the As-Found and As-Left acceptance for the PU and DO, D.
Determine the New Technical Specifications Allowable Values 1.1.1
Background
In the mid-1990's, Southern California Edison installed a degraded voltage protection system to ensure Class 1E 4.16 kV Buses of San Onofre Nuclear Generating Station (SONGS) separates from offsite power if voltage degrades and remains below the voltage needed to support equipment operability (218 kV). This system could cause SONGS to separate from the preferred power source if the voltage from offsite sources is between 218 kV and 222.2 kV. When in that voltage band, Class 1E 4.16 kV Buses of SONGS could transfer to the standby power source (emergency diesel generators) even though the offsite power remained capable of performing its intended safety function. See SONGS Licensee Event Report No. 2005-003 (Reference 6.6.2) for specific details.
The following electrical systems were modified to reduce the voltage required at the SONGS switchyard from 222.2 kV to 218 kV (refer to PCN 561):
The degraded undervoltage relay settings Power cables for 120 Vac distribution systems 120 Vac control circuits for 480 V MCCs 1.1.2 Approach 1.1.2.1.
Requirements of the degraded voltage relay (ABB 27N relay) scheme a)
Class 1 E 4.16 kV buses with the degraded voltage relay scheme must not separate from the normal preferred offsite power source and transfer to the DG when the switchyard voltage is 218 kV and above.
b)
Class 1E 4.16 kV buses with the degraded voltage relay scheme provide adequate voltage to support operability of plant equipment.
1.1.2.2.
Degraded voltage relay (ABB 27N relay) setting SCE 26-426 Rev. 3 I
Reference:
SO 123-XXIV-7.15]
E&TS DEPARTMENT PRELIM. CCN NO.
CALCULATION SHEET Project or ECP:
SONGS 2 & 3 Calc No.
Subject:
TLU Calc for Undervoltage Relay Circuits at Class 1 E 4 KV Switchgear Sheet of REV ORIGINATOR I DATE IRE DATE REV I ORIGINATOR DATE IRE DATE 0
C. B. Whittle 5/16/20051 Joshua Park 5/16/20051 I
0 1
C. B. Whittle 5/24/2005 Joshua Park 5/24/2005 z4 a) Maximum pickup (PU) setting of degraded voltage relay In order to ensure that 4.16 kV bus remains connected to the normal preferred offsite power source when the switchyard voltage is 218 kV and above, the following conditions should be met:
The maximum reset voltage of the degraded voltage relay should be less than the voltage corresponding to the minimum switchyard voltage of 218 kV.
The voltage at the 4.16 kV level corresponding to the minimum switchyard voltage of 218 kV is the upper analysis limit voltage for the maximum reset voltage of the degraded voltage protection relay.
Calculation E4C-090 (reference 6.1.3) determines the upper analysis limit voltage (4161 V).
The 4.16 kV bus voltage at 4.11 seconds during load sequencing (refer to 6.1.4 for an explanation of the 4.11 second time delay) should be greater than the maximum reset voltage of the degraded voltage relay when the switchyard voltage is 218 kV.
Calculation E4C-082 (reference 6.1.4) verifies that 4.16 kV bus voltage at 4.11 seconds during load sequencing is greater than the upper analysis limit voltage (4161 V) for conservatism.
b)
Minimum dropout (DO) setting of degraded voltage relay Operation of the Class 1E system with the voltage corresponding to the minimum dropout voltage of the degraded voltage protection relay must be adequate to ensure operability of plant equipment. Therefore, the minimum dropout voltage of the degraded voltage relay must be greater than the lower analysis limit voltage.
Calculation E4C-090 (reference 6.1.3) determines the adequacy of the lower analysis limit voltage (4100 V) and verifies that the lower analysis limit voltage is adequate for continuous operation of 4.16 kV & 480 V electrical equipment.
Calculation E4C-090, ECN A4481 0, shows that 4100 V at the Class 1 E buses with the cable modification is adequate for continuous operation of 4.16 kV &
480 V electrical equipment with addition of cable 2AB0407P2 (3-1/C 350 MCM) between 480 V bus 2604 and 480 V MCC 2BD (reference ECP #060401140-
- 95) because the Class 1E 4.16 kV bus 2A04 with 4100 V does not provide adequate voltage to 480 V MCC 2BD.
SCE 26-426 Rev. 3 (
Reference:
E&TS DEPARTMENT ICCN NO./
A47480 PRELIM. CCN NO.
PaoR 5 of 37 CALCULATION SHEET ICCN CONVERSION:
ICCN NO. CCNI Project or ECP:
SONGS 2 & 3 Calc No.
Subject:
TLU Calc for Undervoltage Relay Circuits at Class 1E 4 KV Switchgear Sheet of REV ORIGINATOR DATE IRE DATE REV I ORIGINATOR DATE IRE DATE Ir 0
C. a. Whittle 5/16/2005 Joshua Park 5/16/2005 1
C. B. Whittle 5/24/2005 Joshua Park 5/24/2005 9
120 V power distribution systems and 120 V control circuit of Class 1 E 480 V MCCs were evaluated to determine that 4100 V at the Class 1 E 4.16 kV buses is adequate for Class 1 E 120 V circuits.
It was concluded that the Class 1 E 4.16 kV bus 2A04 with 4100 V does not provide adequate voltage to a 120 V power circuit (reference ECN A44805 to E4C-120). Design modification is going to implemented to improve voltages at 120V power distribution system (reference ECP # 060401140-96).
It was also concluded that the Class IE 4.16 kV bus 2A04 with 4100 V provides adequate voltage to a 120 V control circuit of Class 1 E 480 V MCCs (references ECN A44808 to calc. E4C-084, and ECN A44809 to calc. E4C-085).
Calculation E4C-082 (reference 6.1.4), ECN A44806, verifies that with the lower analysis limit voltage of 4100 V, all Class 1 E motors accelerate to their rated speed within the required ESF equipment response time.
1.1.2.3 Nominal pickup (PU) & dropout (DO) setting and Allowable Value of the degraded voltage relay The nominal PU and DO of the degraded voltage relays were determined based on the upper analysis limit voltage, lower analysis limit voltage, Total Loop Uncertainty (TLU), relay deadband (0.2 V), relay setting tolerance (0.05V), and design margin.
It has been determined that, due to the unique requirements of the settings involved with these relays, the calculation of TLU and setpoints of these relays will be within the scope and methodology described in JS-123-103C (Reference 6.3.7).
This calculation seeks to minimize the possibility of unnecessarily dropping the 1 E Buses from the grid on low but adequate voltage. In order to achieve this goal the following approach will be taken.
1.) The calculation of the TLU will be refined to eliminate excess conservatism (compared to the previous calculation, reference 6.1.2), while adhering to SONGS standard JS-123-103C (Reference 6.3.7).
2.) The nominal pickup setpoint will be determined considering the relay TLU, the Lower and Upper Analysis Limits, and a design margin.
3.) The calculation of the Dropout setpoint is based strictly on applying the minimum acceptable Deadband to the Pickup setpoint.
SCE 26426 Rev. 3 (
Reference:
SO 123-XXIV-7.15]
E&TS DEPARTMENT CALCULATION SHEET Project or ECP:
SONGS 2 & 3 Calc No.
E40-130
'rl H f-I f
A at 0
1 r;
- rl.
I=
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I LtD VJItII It, aI tc UIl*Ivuitiali
,l.o
,.n.la lllulno
[a1 nIIaaot
.l -.
Is.
".,.v..lt..
- l
,, uVa.
REV ORIGINATOR DATE IRE DATE REV I ORIGINATOR DATE IRE DATE 0
C.B. Whittle 5/16/2005 Joshua Park 5/16/20051 1
I 1
C. B. Whittle 5/24/2005 Joshua Park 5/24/20051 1.2 Degree of Accuracy The results of the TILU portion of this calculation are based on statistical methods in accordance with SCE Engineering Standard for Instrument SetpointlLoop Accuracy Calculation Methodology, JS-123-103C (Reference 6.3.7). A 95% probability at 95% confidence level as endorsed by RG 1.105 (Reference 6.2.1) is used. Uncertainties are calculated to the nearest 0.001%.
Uncertainties and effects which are less than 0.001% will be deemed negligible for purposes of this calculation (see Assumption 3.1.11).
The results of this calculation are valid under the assumptions specified in Section 3.0.
1.3 Margin The margin is established by two primary sources of conservatism included in this calculation.
They are the Miscellaneous Allowance (see Section 3.1.10) and the calculated Design Margin (see Section 2.1.4).
SCE 26-426 Rev. 3 1
Reference:
E&TS DEPARTMENT I PRELIM. CCN NO.
CALCULATION SHEET Project or ECP:
SONGS 2 & 3 Calc No.
Subject:
TLU Calc for Undervoltage Relay Circuits at Class 1E 4 KV Switchgear Sheet of RLEV ORIGINATOR DATE IRE DATE 11REV ORIGINATOR DATE IRE DATE C
0
.B Whittle 5/6205 Joshua Park 15/neu 1
6/2005 1
C. B. Whittle 5/24/20051 Joshua Park 15/24/2005SI 2
RESULTS/CONCLUSIONS & REQUIREMENTS 2.1 Results/Conclusions 2.1.1 The setpoints for Degraded Voltage Function (127D-1, 2, 3, & 4 relays - ABB 27N relay).
Table 2.1.1 Design Limit Allowable (As-found) Values As-left Values (TLU = +/- 0.70 V)
(AVT = +/- 0.53 V)
(Max. setting Tol. = +/- 0.05 V)
Item (Max. dead band = 0. 2 V)
(Max. dead band = 0. 2 V)
(Max. dead band = 0.2 V)
Ma.Rly Relay (V)
Primary (V)
Relay (V)
Primary (V)
Relay (V)
MaxckRelay 119.00 4159.0 118.83 4153.1 118.35 Max. Relay 118.80 4152.0 118.63 4146.1 118.15 dropout I
I_
__"_I Nom. relay 118.30 4134.5 118.30 4134.5 118.30 Pickup Nom. relay 118.10 4127.5 118.10 4127.5 118.10 dropout Min. Relay 117.60 4110.1 117.77 4116.0 118,25 pickup II II Min. Relay 117.40 4103.1 117.57 4109.0 118.05 dropout I
1 I 2.1.2 Pickup and Dropout Setpoints and Acceptance criteria to be used in Surveillance Test Procedures for the 127D Undervoltage (UV) Relays used for Degraded Voltage Detection. These voltages are at the UV Relay:
Table 2.1.2 Nominal As-Left Acceptance Band 127D Relays Setpoint As-Found Acceptance Band (Max. setting Tol. = +/- 0.05 V)
(Max. dead band = 0.2 V)
Dropout 118.10 Vac 117.57 to 118.63 Vac 118.05 to 118.15 Vac Pickup 118.30 Vac 117.77 to 118.83 Vac 118.25 to 118.35 Vac Notes:
The following requirements for the surveillance tests should be met:
- 1.
M&TE for calibration which meets or exceeds the following specifications:
- 1)
Range is sufficient to measure the DO and PU setpoints (-120 Vac 60Hz).
- 2)
Accuracy is +/-0.057% or better with a 120 Vac 60Hz input.
- 3)
Temperature Effect does not exceed 0.01% over calibration temperature range (the calculation assumes a calibration temperature range of +/- 9F° per Assumption 3.1.3).
L_
SCE 26-426 Rev. 3 (
Reference:
E&TS DEPARTMENT CALCULATION SHEET Project or ECP:
SONGS 2 & 3 Calc No.
E4C-130 Ck~,*
TI II ('~I~- fr~r II a.-urdt~iru~ Rc~I~, Cirr~amitQ ~t (~I~.t iF 4 ICV ~1Mitrhn~~r Sh~t of
- UJ
- b.
.Il U '
V VII
.II ml.tlt
- 1..
~m
.l VII VIW
-I -I
-lI V I I
REV ORIGINATOR IDATE IRE DATE REV IORIGINATOR DATE IRE DATE S
C. B. Whittle 5/16/2005 Joshua Park 5/16/20050 1
1
. B. Whittle 5/24/2005 Joshua Park 5/24/2005 1I
- 4)
Resolution is 100 pVac or better.
- 5)
An Agilent (HP) 3458A Multimeter may be used, under the following conditions:
- a.
An Auto-calibration (ACAL) must be performed before use and after a 4 hour4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> warm-up (meter power on) period.
- b.
All readings to be taken within +/-9 F' of the ambient temperature at which the ACAL was performed.
- c.
Synchronous Sub-sample Mode.
- d.
Use the 100 or 1000 Vac Range.
- 2.
Maintain relay temperature within 750 F +/- 10 F during as-left setting and as-found test.
- 3.
Increased Frequency of Relay Setpoint Checks In order to validate Assumptions 3.2.1 and 3.2.2, "As-Found" and "As-Left" data for the relay Dropout and Pickup values must be taken within six months of operation at the new setpoints. All data taken shall be forwarded to engineering for analysis. If any allowable values are exceeded during this interval, Engineering will evaluate the assumption and calibration methodology. Otherwise, Engineering will determine from the data collected, if the assumptions and calibration methodology are correct and determine a new calibration interval for these relays.
2.1.3 Calculated Allowable Values and Technical Specification Allowable Values Table 2.1.3 provides the calculated allowable values from Section 8.5.1 and the current Technical Specification Allowable Values at the 4 kV Bus Level.
Table 2.1.3 Relays Allowable Values in New Allowable Values 127D-1, 2, 34 the existing Tech. Spec.
in Tech. Spec.
127D-1,_2,_3,_4 (section 4.7)
(Section 8.5.1)
Maximum AV PU
< 4144.6 V
< 4153.1 V Minimum AV DO
_> 4123.0 V
Ž> 4109.0 V SCE 26-426 Rev. 3 (
Reference:
SO I 23-XXIV-7. 15]
E&TS DEPARTMENT PRELIM. CCN NO.
CALCULATION SHEET Project or ECP:
SONGS 2 & 3 Calc No.
Subject:
TLU Calc for Undervoltacie Relay Circuits at Class 1 E 4 KV Switchgear Sheet of REV ORIGINATOR DATE IRE DATE REV ORIGINATOR DATE IRE DATE 0
C. B. Whittle 5/16/2005 Joshua Park 5/16/2005 I
U 1
C. B. Whittle 5/24/2005 Joshua Park 5/24/2005 2.1.4 Graphical Summary of Degraded Voltage Relay Setpoints 230 kV Switchyard Voltage =
218 kV Analysis Limits (V)
Surveillance 0
(V)
Tech Spec (V) 4161 Analysis Limit -
Upper Margin
+ TLU
- TLU Margin Analysis Limit -
Lower 2.0 r
PUMax DO Max 4159.0 4152.0 PUNom DONom PUMin DO-Min 4134.5 4127.5
+AVT
-AVT 118.83 PUMax DOMax 118.63 118.30 PUNom DONom
.18.10 Z 4153.1 PUMin DO-Min 17.57 4109.0 4110.1 4103.1 4100.0 3.1 SCE 26-426 Rev. 3 l
Reference:
S0123-XXIV-7.15]