NL-21-0444, Supplement to License Amendment Request to Revise Technical Specification 3.3.5.2 Allowable Values

Supplement to License Amendment Request to Revise Technical Specification 3.3.5.2 Allowable Values

ML21126A231
Person / Time
Site:	Vogtle
Issue date:	05/06/2021
From:	Gayheart C Southern Nuclear Operating Co
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
NL-21-0444
Download: ML21126A231 (16)

Text

A Southern Nuclear Cheryl A. Gayheart Regulatory Affairs Director 3535 Colonnade Parkway Birmingham, AL 35243 205 992 5316 cagayhea@southernco.com May 6, 2021 Docket Nos.: 50-424 NL-21-0444 50-425 U. S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, D. C. 20555-0001 Southern Nuclear Operating Company Vogtle Electric Generating Plant - Units 1 and 2 Supplement to License Amendment Request to Revise Technical Specification 3.3.5.2 Allowable Values Ladies and Gentlemen:

On March 30, 2021 (ML21089A388), pursuant to the provisions Section 50.90 of Title 10 Code of Federal Regulations (CFR), Southern Nuclear Operating Company (SNC) requested a license amendment to Vogtle Electric Generating Plant (VEGP) Unit 1 renewed operating license NFP-68 and Unit 2 renewed operating license NFP-81. The proposed amendment revises Technical Specification (TS) 3.3.5, Loss of Power (LOP) Instrumentation, Surveillance Requirement (SR) 3.3.5.2 Allowable Values.

On April 19, 2021 (ML21095A087), the U.S. Nuclear Regulatory Commission (NRC) staff provided the results of their acceptance review and concluded that technical information was not provided in sufficient detail to enable the NRC staff to complete its detailed review. In order to make the application complete, the NRC staff requested that SNC supplement the application by May 6, 2021.

SNCs response is provided in the Enclosure.

SNC requests the same approval and implementation schedule as requested in its original application.

The conclusions of the No Significant Hazards Consideration Determination Analysis and Environmental Consideration contained in the original application have been reviewed and are unaffected by this supplement.

This letter contains no NRC commitments. If you have any questions, please contact Jamie Coleman at 205.992.6611.

U. S. Nuclear Regulatory Commission NL-21-0444 Page 2 I declare under penalty of perjury that the forgoing is true and correct.

Executed on the 6 day of May 2021.

Respectfully submitted, Cheryl A. Gayheart Regulatory Affairs Director CAG/kgl/cg

Enclosure:

SNC Response to NRC Request for Supplemental Information Attachments: 1. Data Sheet for Dataforth Part Number DCCA33-04C

2. Data Sheet for ABB Part Number AI620 cc: Regional Administrator NRR Project Manager - Vogtle 1 & 2 Senior Resident Inspector - Vogtle 1 & 2 RType: CVC7000

Southern Nuclear Operating Company Vogtle Electric Generating Plant - Units 1 and 2 Supplement to License Amendment Request to Revise Technical Specification 3.3.5.2 Allowable Values Enclosure SNC Response to NRC Request for Supplemental Information

SNC Response to NRC Request for Supplemental Information NRC Request to Supplement The NRC staff identified that the following information is needed, within 13 working days from the date of this letter, to begin its detailed technical review:

The as-found tolerance (AFT) and as-left tolerance (ALT) values of the nominal trip setpoint (NTS) calibrations.

The potential transformer ratio (for voltage conversion from the transformers primary winding to secondary winding).

Verification of (a) the current Analytical Limits (ALs) of the 4.16 kV Engineered Safety Features (ESF) Bus LOP Instrumentation are 2912 V (Loss of Voltage) and 3683 V (Degraded Voltage), and (b) these ALs are not changed in the calculation.

The NRC staff identified the following information as a request of additional information (RAI) which should be provided with the supplemental information requested for acceptance. If this information cannot be provided, please provide a date when it will be available:

The full model numbers and the vendor (ABB) datasheets of the affected relays, including the relays applicable pickup and dropout voltages and performance tolerances. Also, discuss whether a harmonic filter will be used, which could affect the repeatability versus temperature range uncertainty.

The full model numbers and the vendor datasheets of the voltage-to-current module and the analog-to-digital module, including the uncertainty values of these devices.

The NRC staff needs the above information to begin its detailed technical review and perform an independent verification of the allowable values for the LOV and DV relays trip setpoints.

SNC Response The Degraded Voltage As-Found Tolerance (AFT) and As-Left Tolerance (ALT) values are the same. The AFT and ALT values are two-sided parameters about the Nominal Trip Setpoint (NTS). The AFT and ALT values are +/- 0.30 Volts about the NTS of 107.03 Volts as measured on the 120 Volt side of the sensing transformer. Using the sensing transformer ratio of 35:1, the AFT and ALT Values on the 4160 Volt side of the sensing transformer is equal to +/- 0.30 Volts x 35. The Degraded Voltage AFT and ALT Values are

+/- 10.5 Volts about the NTS of 3746 Volts.

The Loss of Voltage AFT and ALT values are the same. The AFT and ALT are two-sided parameters about the NTS. The AFT and ALT values are

+/- 0.30 Volts about the NTS of 85.0 Volts as measured on the 120 Volt side E-1

SNC Response to NRC Request for Supplemental Information of the sensing transformer. Using the sensing transformer ratio of 35:1, the AFT and ALT Values on the 4160 Volt side of the sensing transformer is equal to +/- 0.30 Volts x 35. The Loss of Voltage AFT and ALT Values are

+/- 10.5 Volts about the NTS of 2975 Volts.

The winding ratio of the sensing potential transformer is 35:1.

The Analytical Limit (AL) for Degraded Voltage is 3683V and for LOP is 2912V. The ALs have not changed in the calculation.

There are not any physical bistable relays. They are modeled in software.

The pickup and dropout voltages are the Setpoint and Reset values. The values and tolerances on the 120 Volt side of the sensing transformer for degraded voltage and loss of voltage are listed below. A harmonic filter is not needed because there arent any physical relay contacts opening and closing and generating harmonics when doing so. There is an analog low pass prefilter and a digital low pass filter built into the analog-to-digital module (ABB AI620).

Degraded Voltage:

Setpoint (pickup) = 107.03V Hi Limit = 107.33V Low Limit = 106.73V Reset (dropout) = 108.53V Hi Limit = 108.83V Low Limit = 108.23V Loss of Voltage:

Setpoint (pickup) = 85.00V Hi Limit = 85.30V Low Limit = 84.70V Reset (dropout) = 86.50V Hi Limit = 86.80V Low Limit = 86.20V The Dataforth voltage-to-current module part number supplied by Westinghouse is DSCA33-1566. The accuracy data for this Westinghouse part number is the same as the non-proprietary accuracy data for Dataforth part number DSCA33-04C. The non-proprietary data sheet for Dataforth part number DCCA33-04C is provided as Attachment 1 to this Enclosure. The ABB analog-to-digital module part number is Al620. The non-proprietary data sheet for the ABB part number AI620 is provided as Attachment 2 to this Enclosure.

E-2

Southern Nuclear Operating Company Vogtle Electric Generating Plant - Units 1 and 2 Supplement to License Amendment Request to Revise Technical Specification 3.3.5.2 Allowable Values Attachment 1 Data Sheet for Dataforth Part Number DCCA33-04C

High Performance Signal Conditioners D S C A DSCA33 Isolated True RMS Input Signal Conditioners Description Each DSCA33 True RMS input module provides a single channel of AC input which is converted to its True R S D value, filtered, isolated, Features amplified, and converted to standard process voltage or current output

• Interfaces RMS Voltage (0 - 300V) or (Figure 1). RMS Current (0 - 5A)

The field voltage or current input signal is processed through an A

• Designed for Standard Operation with coupled pre amplifier and R S converter on the field side of the Frequencies of 45Hz to 1000Hz isolation barrier. The converted dc signal is then filtered and chopped by a proprietary chopper circuit and transferred across the transformer (Extended Range Operation to 20kHz) isolation barrier, suppressing transmission of common mode spi es and ompatible with Standard urrent and Potential surges. The computer side circuitry reconstructs, filters and converts the Transformers signal to industry standard outputs.

• Industry Standard Output of 0 to 1mA, Module output is either voltage or current. For current output models a 0 to 20mA, 4 to 20mA, 0 to +5V, or 0 to +10V dedicated loop supply is provided at terminal 3 (+OUT) with loop return . Factory alibrated Accuracy located at terminal O T . The system side load may be either oating (Accuracy Class 0.2) or grounded.

Ad ustable ero and Span Special input circuits provide protection against accidental connection of power line voltages up to A and against transient events as defined

• 1500Vrms Transformer Isolation by ANSI I . . . Protection circuits are also present on the signal

• Input Overload Protected to 480V output and power input terminals to guard against transient events and (Peak AC & DC) or 10Arms Continuous power reversal. Signal and power lines are secured to the module using screw terminals which are pluggable terminal bloc s for ease of system

• 100dB CMR assembly and reconfiguration.

• ANSI/IEEE C37.90.1 Transient Protection DS A modules have excellent stability over time and do not re uire

• Easily Mounts on Standard DIN Rail recalibration, however, both ero and span settings are ad ustable to

• C-UL-US Listed and CE Compliant accommodate situations where fine tuning is desired. The ad ustments are made using potentiometers located under the front panel label and

• ATEX Compliant (all models except are non-interactive for ease of use. DSCA33-04x, -05x)

Due to circuit limitations, DSCA33-04x and -05x are not ATEX compliant.

WARNING: The DSCA33

• C u r r e n t In p u t M o d e ls o n ly interfaces to hazardous voltages and *

• A d d ju m p e r s fo r C u r r e n t In p u t M o d u le s should only be wired by ualified ( p r o vi d e d w i t h D S C A 3 3 - 0 6 , - 0 7 )

personnel or licensed electricians.

Isolation Barrier I _ _ _ _-;::,"

1 Isa-Chopper 11

Amplifier 1

IL Pat.

____ Pending ..,

I I

Isolated I Field-Side I I

Power ---*I Isolated +Vs ystem-Side Power LPF'\

F i g u r e 1 : D S C A 3 3 B l o ck D ia g r a m 2 0 8 For information call 800-444-7644

©1995-2017 Dataforth Corporation, All Rights Reserved ISO9001:2008-Registered QMS

II) DATAFORTH High Performance Signal Conditioners D S C A Specifications Typical at TA and D supply voltage Ordering Information Module DSCA33 Model Input (rms) Output (dc)

Input DSCA33-01 0mV to 100mV 2, 3, 4, 5, 6 Signal Range 100mV to 300Vrms, 0 to 5Arms DSCA33-02 0V to 1V 2, 3, 4, 5, 6 Standard Frequency Range 45Hz to 1000Hz DSCA33-03 0V to 10V 2, 3, 4, 5, 6 Extended Frequency Range 1kHz to 20kHz Impedance pF thru , . , . DSCA33-04 0V to 150V 2, 3, 4, 5, 6 Coupling AC DSCA33-05 0V to 300V 2, 3, 4, 5, 6 Protection DSCA33-06 0A to 1A 2, 3, 4, 5, 6 Continuous (-01 thru -05) 350Vrms DSCA33-07 0A to 5A 2, 3, 4, 5, 6 Continuous (-06 thru -07) 5Arms (-06), 10Arms (-07) max Transient (-01 thru -05) odules can be ordered with other input output ranges.

ANSI/IEEE C37.90.1 onsult factory for ordering details and specifications Transient (-06 thru -07) See note 1 Output Output Ranges Available Signal Range See Ordering Information Ad ustability +/- 5% Zero & Span Output Range Part o u fi am e Load Resistance max. mA models , max. mA models Current Limit 1.4mA (0-1mA models), 30mA (0/4-20mA models), 2. 0V to +10V NONE DSCA33-01 8mA (0-5/10V models) 3. 4 to 20mA C DSCA33-01C Protection 4. 0 to 20mA E DSCA33-01E Short to Ground Continuous Transient ANSI/IEEE C37.90.1 5. 0V to +5V A DSCA33-01A Ripple and Noise <0 .025% Span rms 6. 0 to 1mA B DSCA33-01B Accuracy (10-100% Span)(2) (3)

Sinusoid 50/60Hz +/- 0.25% Span 45Hz-1kHz +/- 0.25% Reading Additional Error 1kHz-20kHz +/- 0.75% Reading Additional Error Non-Sinusoid Crest Factor = 1 to 2 +/- 0.05% Reading Additional Error Crest Factor = 2 to 3 +/- 0.15% Reading Additional Error Crest Factor = 3 to 4 +/- 0.30% Reading Additional Error Crest Factor = 4 to 5 +/- 0.40% Reading Additional Error Vs. Temperature ppm Isolation (Common Mode)

Input to Output, Input to Power Continuous 1500Vrms max Transient ANSI/IEEE C37.90.1 Output to Power Continuous 50VDC max Response Time (0 to 99%) <4 00ms D S C A CMR (50 or 60Hz) 100dB Power Supply Voltage 19 to 29VDC Current 45mA (VOUT), 65mA (IOUT)

Sensitivity +/- 0.0002%/ %

Protection Reverse Polarity Continuous Transient ANSI/IEEE C37.90.1 Mechanical Dimensions 2.95 x 0.89 x 4.13 (h)(w)(d) (75mm x 22.5mm x 105mm)

Mounting DIN EN50022 -35x7.5 or -35x15 rail Environmental Operating Temperature Range to Storage Temperature Range to Relative Humidity 0 to 95% Noncondensing HazLoc ATEX All models except DSCA33-04x, -05x Emissions EN61000-6-4 ISM, Group 1 Radiated, Conducted Class A Installation Notes:

Immunity EN61000-6-2 ISM, Group 1 . This uipment is Suitable for se in lass I, Division , Groups A, B, , D, RF Performance A +/- 0.83% Span Error or Non-Hazardous Locations Only.

ESD, EFT Performance B . ARNING xplosion Ha ard Substitution of omponents ay Impair NOTES: Suitability for lass I, Division .

ontact factory or your local Dataforth sales office for maximum values. 3.) WARNING - Explosion Hazard - Do Not Disconnect Equipment Unless For to seconds the max allowable transient current rating is event time . For less than second, Power Has Been Switched Off or The Area is nown to be Non Ha ardous.

ANSI I . . applies with a . load. For greater than seconds, the A max continuous rating applies.

(2) For 0-10% Span measurements, add 0.25% accuracy error (-02 thru -07) or 1.00% accuracy error (-01). Accuracy 4.) The Power to These Devices Shall Be Limited By an Over-Current Protection includes linearity, hysteresis and repeatability but not source or external shunt inaccuracy if used . Device, L ertified Fuse D D Rated A ax.

At standard H factory calibration H for , . onsult factory for calibration at other fre uencies.

Visit our website www.dataforth.com 2 0 9

©1995-2017 Dataforth Corporation, All Rights Reserved ISO9001:2008-Registered QMS

Southern Nuclear Operating Company Vogtle Electric Generating Plant - Units 1 and 2 Supplement to License Amendment Request to Revise Technical Specification 3.3.5.2 Allowable Values Attachment 2 Data Sheet for ABB Part Number AI620

S600 //0 Hardware Reference Manual Section 3.2 A/620 3.2 Al620 Summary The analog input module AI620 converts analog input signals from transmitters to digital values required by the programmable controller. It has 16 differential channels for Oto 20 mA, 4 to 20 mA, -20 to +20 mA or -10 to +10 V.

Associated data base element Associated data base elements are AI620 for the module and AIS620 for its input channels.

Module replacement On-line replacement possible. No jumpering and no adjustments required.

Technical data Table 3-2. AJ620 Technical data Analog Input Al620 No. of inputs 16 Type of input differential, resistor network ,,high CMV" Measurement range 0 to 20 mA 4 to 20 mA

-20 to +20 mA

-10 to +10V Overrange <-1 mA; >20.3 mA

<-3.2 mA; >20.3 mA

<-21 mA; >20.3 mA

<-10.5 V; >10.5 V Live zero error <2mA Isolation no Input resistance

- Current input 250 Ohms

- Voltage input 500 kOhms Common mode voltage {between channels) 100V CMRR 80dB 3BSE 011 123R0001 Rev B 3-7

S600 //0 Hardware Reference Manual Chapter 3 Data sheets Table 3-2. AJ620 Technical data (Continued)

Analog Input Al620 Analog input error( 1)

- Max error at 25°C 0.2%

- Temp. coefficient 0.01 %/°C Resolution 12 bits Filter

- Low-pass, cutoff frequ. 10 Hz

- Mains frequ. suppression at 16 2/3, 50, 60 Hz 50 dB Conversion time

- for all channels <= 40 ms Current consumption (from USA/USB)

- typical 200mA

-maximum 280mA Power dissipation

- typical( 2) 5.2W

- maximum( 3 ) 7.8W Weight 1.15 kg (1) For technical data valid in conjunction with the type approvals mentioned below refer to Advant Marine System 110 User's Guide, document no.

3BNP00206R0101, Chapter 1, Table 1-1 .

- American Bureau of Shipping (ABS)

- Bureau Veritas (BV)

- Det Norske Veritas (DNV)

- Germanischer Lloyd (GL)

- Lloyd's Register of Shipping (LRS)

- Nippon Kaije Kyokai (NK)

- Registro Italiano Navale (RINA)

(2) At rated supply voltage, all inputs loaded at 50 %

(3) At max. supply voltage, all inputs loaded at 100 %

3-8 3BSE 011 123R0001 Rev B

S600 //0 Hardware Reference Manual Section 3.2 A/620 Front view

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0 0 FAULT 0 0 RUN Im Im u~

Im Im Im Im 01 u~ Im Im

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02 u Im Im 03 Im Im u~ Im Im 04 u~

Im Im Im Im

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u 05 Im Im 06 uZP7 ~

Im Im Im Im 07 u~ Im Im 08 Im Im Im Im 09 Im Im Im Im 10 Im Im 11 Im Im 12

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Im Im ZP13 Im Im UP Im Im 13

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u Im Im 14 Im Im 15 u~ Im Im ED 16 Im Im aJ

© Al620 Al620 ANALOG INPUT Analog Input POSITION--

STATION _ _

Figure 3-5. Al620 Front view 3BSE 011 123R0001 Rev B 3-9

S600 1/0 Hardware Reference Manual Chapter 3 Data sheets Process connections Process Al620

[>

Transmitter CH1 2 UP ZP 3

[>

Current output CH2 4

[>

Transmitter UP [>

Voltage output EM R: Shunt 25012 Process connector TF620 or TK630 VAR: Metal oxide varistor Figure 3-6. AI620 Process connections 3-10 3BSE 011 123R0001 Rev B

S600 //0 Hardware Reference Manual Section 3.2 A/620 Functional description The analog input module AI620 has 16 differential input channels for Oto 20 mA, 4 to 20 mA, -

20 to +20 mA or -10 to +10 V. The input channels are not isolated, but have a resistor network allowing a common mode voltage ofup to 100 V. The module converts the analog input signals from transmitters to digital values required by the programmable controller.

The module is equipped with an internal processor and analog multiplexers. The input signals pass through analog and digital filters. Interference suppression and signal filtering and offset and gain correction are performed either individually or together for all channels. Under program control, the multiplexer connects one measurement channel at a time to the ND converter. If a severe fault is detected, the LED (FAULT) on the front of the module lights and the internal input signals are set to "O."

There are two LEDs on the front of the module. A green LED (RUN) indicates that the module is operating normally. A red LED (FAULT) signals a severe fault.

Process Analog input AC 110 Software Trans- Module Application mitters ..

.... Al620 ..

.... program J I I

/_

Process connector Figure 3-7. AI620 Block diagram The hardware and software signal processing in the input module AI620 involves the following procedures:

Filtering and ND conversion

• Prefiltering and gain control

• Conversion of analog signals to digital signals Digital filtering.

3BSE 011 123R0001 Rev B 3-11

S600 1/0 Hardware Reference Manual Chapter 3 Data sheets Signal range and supervision

• Signal range Overrange and live zero supervision

• Limit check with hysteresis.

The following diagram shows how current and voltage signals are processed.

Process AC 110

_. Al module Al620 Application program 1/0 communication with producers

_. -~

Pre-filtration -

AID con- -

Digital filtration -

Signal range DB PC program Control

& version & elements module gain super-

_. control

.A vision

.a.

~

Limit check t--

PC elements

=Para-

_. /

• - meter p roce§s connector Figure 3-8. Processing of analog input signals Filtering and AID conversion The input signals pass through an analog lowpass filter to remove high-frequency interference.

Filtered signals are transferred by an analog multiplexer to an instrument amplifier and conditioned for the AID conversion.

After AID conversion, the signals are filtered a second time by a digital filter to suppress the mains frequency interference.

Signal range and supervision Excursions of the input signal outside its permissible range, i.e., input signals five percent greater than the normal input range, are indicated as an error in the data base elements. In that case, values are represented by ,,NAN" (Not a Number).

If the measurement range is 4 to 20 mA, the AI620 checks the live zero signal, too.

3-12 3BSE 011 123R0001 Rev B

S600 //0 Hardware Reference Manual Section 3.2 A/620 Data base element parameters In the database element AI620, you can select the mains frequency to be supressed.

In the database elements AIS620, you can set the following parameters individually for each input channel:

• Channel active (on or oft)

• Conversion parameter (signal range)

• Two low-limit values

• Two high-limit values

• One hysteresis.

You can select whether the signal shall be active or not. If the signal is designated inactive, the value for the corresponding channel in the data base element is not updated.

The limit check can supervise four limits, two low and two high. The limits have a hysteresis which is always within the limit (see figure below). Limit values and hysteresis are determined by parameters in the data base elements. The unit oflimits and hysteresis differ depending on the type of analog input module: for AI620, values are specified in a percentage.

UPPER LIMIT

_- - - ----,""+-----,.o'-t- -+-- - - - - - - - - HI. LIM 2

---,,..----+-+--+----+--+--------- HI. LIM 1 HYSTERESI~----+ - ------- - - - - - - - + - - - - - + - - - i - - -..- - - - - - - - -

LIMITS LOWER LIMIT

---1----+---+--+---+--+--+---+----+---F-+--- LO. LIM 1 i iii iii LIMIT PASSAGES i

Figure 3-9. Limit check with hysteresis The data base elements also contain information (signals) identifying which limits have been exceeded. This information (signals) is accessible for PC elements.

3BSE 011 123R0001 Rev B 3-13