ML21140A362

Massachusetts Institute of Technology (Mit) - Supplement to Response to the Request for Additional Information for Battery Upgrade License Amendment Request (EPID: L-2021 -NFA-0000)

ML21140A362
Person / Time
Site:	MIT Nuclear Research Reactor
Issue date:	05/17/2021
From:	Lau E Massachusetts Institute of Technology (MIT)
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
EPID L-2021 -NFA-0000
Download: ML21140A362 (14)

Text

MIT NUCLEAR REACTOR LABORATORY AN MIT INTERDEPARTMENTAL CENTER Edward S. Lau Mail Stop: NW12-122 Phone: 617 253-4211 Assistant Director 138 Albany Street Fax: 617 324-0042 Reactor Operations Cambridge, MA 02139 Email: eslau@mit.edu 17 May 2021 U.S. Nuclear Regulatory Commission Washington, D.C. 20555 Attn.: Document Control Desk

Subject:

Supplement to MIT Response to the Request for Additional Information for Battery Upgrade License Amendment Request (EPID: L-2021 -NFA-0000)

The Massachusetts Institute of Technology (MIT) hereby submits a supplement to its March 24, 2021, response to the Request for Additional Information (RAI) on the License Amendment Request (LAR) to upgrade the Emergency Electrical Power System batteries at the MIT Reactor (MITR).

Accordingly, MIT provides supplemental information in the following format: the NRC RAI discussion item summary in italics, followed by the MIT answer in normal font. Wherever necessary, MIT's responses will reference supporting documents in various Enclosures.

I. Short circuit evaluation required by Std 1187 (Section 5.8.1) - Figure 8-1 of the SAR (and application) shows the connection of the new battery and charger to the existing wiring.

This includes fused and unfused overcurrent protection devices. The NRC staff do not find information on any MIT-provided evaluation that there was a short circuit evaluation (given the larger battery and new charger) to confirm the acceptability of the existing protection devices.

Response to Topic #1:

Figure 8-1 of the MIT SAR shows the connection of the new battery and charger to the existing wiring. It includes an existing 2-pole, 200-amp fused switch directly downstream of the battery and charger. The new batteries have a maximum short-circuit current of 6,038 amps (first item on page 5 of the 24 March 2021 RAI Response submittal Enclosure 2, the C&D Technologies battery calculation report), compared to 7,407 amps for the existing C&D model KCR-15 battery cells. The new charger is a HindlePower Model AT30. The exact model specification is provided in the manufacturer's Production Test Data Sheet and AT30 Specification Table (Enclosures S 1 and S2). The data sheet includes a current limit test, and lists 1) an AC Input Protection provided by a standard AC circuit breaker for maximum designed current of 9 amps and trip current of 18.75 amps, and 2) a DC Output Protection provided by a standard DC circuit breaker for designed current of 30 amps and trip current of 50 amps. Both these breakers ., D

}-D~ 1

µ1-t

RAI Response Supplement for Batteries Page 2 of 5 provide overcurrent protection well before the 200-amp fuse design of the existing circuitry.

Therefore, the overall system overcurrent protection for short circuits is satisfactory.

2. Technical basis of service life & replacement -

a. NRC staff do not find any discussion of the point in the performance test information as to when the battery would require replacement (e.g. , battery no longer passes performance test); see IEEE 1188, Section 8.

b. MIT provided a manufacturer data table on battery testing. However, the NRC staff do not find any explanation on how to interpret the information in the table and any conclusions on reliability from the testing.

Response to Topic #2:

MIT will apply the Std. IEEE 1188 Section 8 recommendation to replace the battery when its capacity falls below 80% of the manufacturer's rating. On their IEEE 1188-2005 test report, the manufacturer calculates the percentage of capacity using a temperature correction factor based on a time-adjustment method (as per Section 7.4 capacity test methods in IEEE 1188). The table lists the parameters that are used to produce the percentage capacity for each of MIT's 60 new battery cells, as factory-tested prior to shipment to MIT. Once the batteries are installed, MIT will track their performance closely using the battery monitoring system.

Std. IEEE 1188 Section 8 also suggests other factors and indicators for battery replacement. It lists abnormally high cell operating temperatures, unsatisfactory performance test results, and a low cell voltage that fails to respond to corrective action; all these would also be taken into consideration for battery or cell replacement.

Additionally, as listed in MIT's 24 March 2021 Response to RAI #3, a Phoenix Broadband Technologies SC4 battery monitoring unit will be installed, capable of monitoring battery voltages, internal resistance, and operating temperatures, and capable of providing data storage and alarms. This monitoring unit provides convenience in the measurement, recording, and tracking of many battery parameters. However, if it is not operable, all required parameters will be measured using handheld instruments. The continuous monitoring of battery parameters will provide early warning if the battery bank or any individual cells are developing a problem and require corrective action or replacement.

The manufacturer's IEEE 1188 test report shows the test results for each of the 60 battery cells fabricated for MIT. All 60 cells met product specifications and proved to be in excellent condition. Enclosure S3 is an updated copy of the IEEE 1188 test report, which now contains the manufacturer's associated conclusion statement. Additionally, the manufacturer provides a "Service Life - Reliability" statement for the msEndur II series VRLA battery on page 4 of C&D Technologies cut sheet #12-1016 (Enclosure S4). There is also a similar, abbreviated statement on page 1 of the cut sheet under "Features & Benefits I Advanced Service Life". The conclusion statement in the test report and the reliability statement in the cut sheet by the manufacturer provide assurance that the AT-1 SP battery cells will be reliable for their application at the MIT Reactor. Furthermore, with close monitoring and adherence to the manufacturer's maintenance guidelines to ensure that the battery is operating in favorable conditions per IEEE 1188, the batteries are expected to deliver their performance in a reliable manner.

RAI Response Supplement for Batteries Page 3 of 5

3. Battery monitoring system - what alarms are provided with the battery monitoring system?

Further, please discuss the following:

a. Std. 1188 says the battery should have ground fault detection, but NRC staff do not find MIT discussion on monitoring/or ground faults.

b. Std. 1188 also recommends H2 monitoring. If monitoring is not required, please indicate so and why.

Response to Topic #3:

The battery monitoring system monitors the string voltage, float current, ripple current, battery voltage delta, discharge status, and discharge/load current. MIT has 60 battery cells arranged in series as a single string. The battery monitoring system also monitors, for each cell, the terminal post DC voltage, terminal post temperature, battery and cell admittance. Up to four user-defined alarm thresholds can be set for each analog parameter: "High-High", "Low-High", "High-Low",

and "Low-Low". (This information is under "General Specifications" on page 2 of the 24 March 2021 RAI Response submittal Enclosure 3c, the "Site Controller Unit PBT-PA-BMS-SC4" brochure.)

Additionally, the battery charger itself provides several built-in alarms: AC Input Failure, DC Output Failure, High Voltsctc, Low Voltsctc, and Positive(+) and Negative(-) Ground Faults (per "Standard Features" on page 3 of the 24 March 2021 RAI Response submittal Enclosure 4, the "AT30 Series Microprocessor Controlled Float Battery Charger" brochure.) Therefore, battery ground fault detection is monitored by the battery charger rather than by the battery monitor.

MIT determined that hydrogen monitoring is not necessary, because as described in the 24 March 2021 RAI Response submittal, the batteries are installed within the NW12-100D Utility Room, which has adequate ventilation with a continuously-operating exhaust fan on the ceiling above the batteries. The manufacturer specifies the amount of hydrogen produced during charging, based on a worst-case boost/equalize charge mode in accordance with Std.

IEEE 1635-2012 Table 2, is 0.066578 ft. 3 of H2 per hour for all 60 battery cells together (per page 4 of the 24 March 2021 RAI Response submittal Enclosure 2, the C&D Technologies battery calculation report). By comparison, the existing C&D KCR-15 batteries produce up to 0.0594 ft. 3 ofH2 per hour.

Additionally, VRLA batteries are sealed. Any hydrogen produced re-combines under pressure with oxygen inside the battery. Hydrogen gas escapes only if internal pressure exceeds the rating of the pressure relief valve, in which case 0.066578 ft. 3 of H2 per hour is the maximum amount emitted. The manufacturer confirms that the amount of hydrogen produced during discharge is less than the amount produced during charging. Therefore, the amount of hydrogen produced remains small in all cases. The room is well-ventilated, so hydrogen measurement is not required. The space is inspected on a daily procedure whenever the building is open. If the room ventilation fan fails, keeping the room's main door open will promote adequate air circulation.

RAI Response Supplement for Batteries Page 4 of 5

4. Surveillance Requirements - MIT provides a list of monthly surveillance requirements for the battery charger system that ends in "etc." The list does not include recommended surveillance requirements listed in Section 5. 2.1 of Std. 1188. The NRC stciff did not find information regarding performance of subparagraph e, f, and g to Section 5. 2.1 of Std. 1188.

Response to Topic #4:

In the 24 March 2021 RAI Response letter, MIT mentioned four items as an example of elements for monthly inspection. These four items match the Std. IEEE 1188 Section 5.2.1 "Monthly" items (a) through (d). Items (e) through (g) will also be inspected.

Items (e) and (f) are monthly visual inspections that are recommended by the manufacturer (per Part 9 "Maintenance" in 24 March 2021 RAI Response submittal Enclosure 3a, the "Installation and Operating Manual" for C&D Technologies msEndur II batteries). Specifically, under Part 9 .1, item 1 states, "Visual inspection of the battery for general appearance and connector conditions. Check for bulging jars, corrosion build up or any signs of heat damage to the jars/covers and connectors. Visually check cell spacing and cell side restraint plate gap as noted in Appendix C, Table 2." As stated in MIT's 24 March 2021 Response to RAI #5, where surveillance and performance test recommendations are in the manufacturer's "Installation and Operating Manual", we intend to follow those recommendations according to the manual.

Therefore, these items will be performed monthly.

Std. IEEE 1188 Section 5.2.1 "Monthly" item (g) recommends a check and recording of the DC float current (per string). Because the battery is arranged as a single string, this was judged to be covered by the "Installation and Operating Manual" Part 9.1, item 3, which states, "Measure and record the total system float current." Therefore, likewise per MIT's 24 March 2021 Response to RAI #5, this item will be performed monthly.

5. Charger customization - MIT provided manufacturer information (brochure) on the battery charger that includes a list of numerous options for the battery charger. NRC staff did not find any explanation of which options were purchased/included in the MIT battery charger.

Response to Topic #5:

The battery charger is a HindlePower Model AT30, with the specific model number being AT30-130-030-F. Details of the options selected for MIT's application are indicated in the

• Enclosure S 1 Production Test Data Sheet (checkboxes showing charger functions tested satisfactorily, inspection items, and order completion) and Enclosure S2, the AT30 Specification Table (selected options highlighted by red boxes marked by the manufacturer).

6. Charger Load information - MIT provide a manufacturer data sheet that includes an (MIT) added calculation of load information in a red text box. The NRC staff did not find any explanation of the factors used in the calculation, specifically the "1 .1 " multiplier and the "O" addition.

RAI Response Supplement for Batteries Page 5 of 5 Response to Topic #6:

The manufacturer data sheet was delivered to MIT with a red text box already m place, containing a formula used to size the battery charger for MIT's application:

"(456Ahr*l.1)/24hrs + 0A = 21Amp min output" The 456 amp-hours is MIT's requested battery load capacity, the product of 57 amps for 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br />.

The 1.1 factor is the design margin based on 90% charger efficiency.

The second term is allowance for momentary loads; 0 amps represents a constant current load.

The resulting charger capacity calculation of 21 amps is the minimum capacity required to refill the batteries within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> following a full-load discharge of 8-hour duration. The actual charger is rated for 30 amps DC output.

In summary, the above supplements to our RAI response, and the referenced enclosures, represent additional information identified in a telephone call on March 26, 2021, a followup NRC email message dated April 1, 2021, and an additional telephone call on April 9, 2021. The supplement letter and enclosures submitted herewith do not contain any proprietary information.

This RAI response supplement submittal contains the following four

Enclosures:

Enclosure SI "AT Series Battery Charger Production Test Data Sheet" (two pages).

Enclosure S2 "AT30 Specification Table" (one page).

Enclosure S3 IEEE 1188 Test - Order 2516069 (Rev. 2 as updated 17 May 2021) (two pages).

This replaces Enclosure 1 from MIT's 24 March 2021 RAI Response submittal.

Enclosure S4 C&D Technologies, Inc. cut sheet #12-1016 for the msEndur II series VRLA battery (4 pages).

Sincerely, Edward S. Lau, Assistant Director of Reactor Operations MIT Research Reactor I declare under penalty of perjury that the foregoing is true an Executed on os/i =r/40:2.1 Date

Enclosures:

As stated.

cc: USNRC - Senior Project Manager USNRC - Senior Reactor Inspector Research and Test Reactors Licensing Branch Research and Test Reactors Oversight Branch Division of Licensing Projects Division of Licensing Projects Office of Nuclear Reactor Regulation Office of Nuclear Reactor Regulation

[ Enclosure S1 )

AT SERIES BATTERY CHARGER 015008-00 (Revised 02/21/07)

PRODUCTION TEST DATA SHEET CUSTOMER MODEL No AC INPUT VOLTAGE PRESIDENT POWER AT30-130-030-F 480 SERIAL No TECHNOLOGIES 20150/268880 Refer to test procedure (CD5008-00) for test conditions and instrumentation required.

Disconnect PC Boards. See test procedure for other preparations. PASSED DIELECTRIC AC input to chassis 2500 Vrms [8J WITHSTAND AC input to DC output 2500 Vrms 18]

TEST DC output to chassis 2500 Vrms [8J (Section 3.1) Reconnect all components. If the Auxiliary Relay Board is installed, ensure wower suoolv iumoer P4 is correcttv olaced for voltage ratina of charaer.

[8J Edit mode

[8J AC ON indicator PROGRAM FRONT PANEL [8J UP arrow AMMETER

[8J Lamp & relay test VERSION FUNCTIONS [8J DOWN arrow ACCURACY

[8J CHRG MODE key (Section 3.2) (Sections 3.4 [8J Current limit edit mode (Section 3.4.6)

[8J EQLZ METH key and 3.5) [8J HVDC shutdown select

[8J Voltmeter is +/-1 % [8J Calibrated to 1%

[8J Set to OFF 6.58 (see below) (see table below)

[8J Voltmeter calibration

[8J Ammeter is +/-1%

(see below) [8J Front panel disable (3.5)

CURRENT LIMIT FLOAT CURRENT LIMIT MAX. INPUT t8J Current limit set to 110%

TEST f----"V--=O=LT.:..:.A..:...:G=E'--+-----'-P-=E"-'R"-- C=E--f----"C-=U..:...:Rc...cRE=N..:...:T~[8J Properly sized AC input wire FO=R-"'M=A=N=

(Section 3.6) 135 Vde 33 Ade at 105 Vde 8 _2 Aae t8J AC breaker rated 125% of maximum in ut current (WITH BATTERY) (NO BATTERY)

OUTPUT VOLTAGE OUTPUT CURRENT RIPPLE TEST RIPPLE AT BATTERY RIPPLE AT CHARGER (Section 3.7) 136.2 Vdc 30 Ade 17.4 mVrms 113 mVrms Vac Load Current Vdc Ade Percent Regulation REGULATION 110% 5% 139.93 1.50 TEST (Section 3.8) 100% 50% 139.90 15.00 0.0286 88% 100% 139.85 30.00

[8J HVDC 18] LVDC AUXILIAR_ Y ALARM RELAY PC BOARD BUILT-IN [8J AC INPUT FAILURE ALARM 18] POS GND [8J Board and cable are QC stamped FUNCTIONS [8J NEG GND [8J Jumper P4 correctly placed (Sections 4.1.1 18] GND DET DISABLE (P5) [8J Low DC Voltage through 4.1.6) [8J COMMON ALARM RELAY

[8J HVDC SHUTDOWN D NIA 18] LOW LEVEL DETECT FINAL Parameters are set to factory default values.

SETTINGS

[8J Parameters are set to (Section 5.1) customer-specified values.

o:lqa docsltest datalat series\000000-599990\000000-529990\268880td.docx 1 of 2 Printed December 2, 2020

015008-00 AT SERIES BATTERY CHARGER (Revised 02/21107)

PRODUCTION TEST DATA SHEET VOLTMETER CALIBRATION [8J Voltmeter reads within 1% (See table below).

(Section 5.2) 0:: VOLTMETER AMMETER w

I-w en Vdc TOLERANCE Ade TOLERANCE

a; w

__,(.) 12 +/-0.2V 6- 25 +/-0.3A wZ z<<: 24 +/- 0.4 V 30 - 100 +/- 1.5A

..: 0::

c..W I-

..J 0 48 +/- 0.8 V 125 - 400 +/-5A 5 I- 130 +/- 2.0V 500 - 800 +/- 10A 0::

u..

1,000 +/- 12A

[8J Enclosure fully painted; no chips, scratches, or other cosmetic defects.

[8J Unit is free of dirt, oil, handling marks.

[8J Nameplate agrees with order.

MECHANICAL

[8J Solder joints are intact.

INSPECTION

[8J Crimped and bolted connections are secure.

(Section 5.3)

[8J Harnesses are run correctly and are secured.

[8J Jumpers and connectors are fully seated.

[8J Labels are affixed in their proper locations.

0 0 w 0 w

w 0 w

0::: 0:::

w Q. w Q.

c.. Q.

0 0::: :i: ITEM 0 0::: :i: ITEM 0 rn 0 rn Wired for this ac input voltage Options (cont'd) 120 Vac 60 Hz [8J [8J AC input lightning arrestor 208 Vac 60 Hz Funqus proofing DD 240 Vac 60 Hz Static oroofinq

[8J [8J 480 Vac 60 Hz Cabinet heater 550 Vac 60 Hz (covers 525 - 600 Vac) Barrier type terminal block for alarms 220 Vac 50/60 Hz Documentation

[8J [8J 380 Vac 50/60 Hz User's manual 416 Vac 50/60 Hz Custom drawinqs D Flash Drive Custom: Vac 60 Hz Record drawings D Certified ORDER COMPLETION Custom: Vac 50/60 Hz Certificate of Conformance (Section 5.3)

AC Input Protection Declaration of Conformance (CE)

[8J [8J Standard ac circuit breakers Accessories Medium AIC ac circuit breakers External Tempco probe (A 10)

Hiqh AIC ac circu it breakers Communications PC board (A12)

Standard AC fuses Forced load sharing (A 13)

DC Output Protection Drip shields

[8J [8J Standard de circuit breakers Floor/ORack/OWall mtg. brackets Medium AIC de circuit breakers Front door lock High AIC de circuit breakers other Standard DC fuses other Options other

[8J [8J Standard de output filterinq other Batterv eliminator filterinq other

[8J [8J Auxiliary alarm relay PC board other Ground bus bar/pad other DATE BY TEST COMPLETED 12/2/2020 TB o:lqa docsltest datalat series\000000-5999901000000-5299901268880td.docx 2 of 2 Printed December 2, 2020

[ Enclosure S2 )

AT30 Specification Table Sample B C D E F G H J K L M N p 0 5 0 f 4 8 0 s "7'. "

/\ Fl Your Code lflll*I 1 3 lo lo I3 I0 IF 14 Is I 0 Is X js X IA IX L X jx I 012 12Vdc AC Input M MediumAIC F Circuit Breaker Nominal DC 024 24Vdc Rating*** H HighAIC B

Output Voltage 048 48Vdc 0 No Breaker 130 130Vdc F Installed G AC Input Fuses 025 25Adc X Not Supplied 030 30Adc s Standard AIC 040 40Adc DC Output M Medium AIC H Circuit Breaker 050 50Adc Rating*** H High AIC 075 75Adc 0 No Breaker 100 100Adc F Installed J DC Output Fuses 125 125Adc X Nominal DC 150 150Adc Auxiliary Alarm A C K Output Current 200 200Adc Relay Board X Not Supplied 250 250Adc Copper G Installed L

300 300Adc Ground Bus X Not Supplied 400 400Adc AC Lightning L Installed M

500 500Adc Arrestor X Not Supplied 600 600Adc Applied N Fungus Proofing 800 800Adc 1K0 1000Adc p Static Proofing u Unfiltered DC Output D

Filtering 208 208V 60Hz 240 240V 60Hz 480 480V 60Hz AC Input Voltage*

E 550** 550V 60Hz (3~)

220 220V 50/60Hz 380 380V 50/60Hz 416 416V 50/60Hz Circuit Breaker AC & DC Ratings STANDARD MEDIUM HIGH Input: 5kAIC- 720/208/240/480Vac Input: 25kAIC - 120/208/240/480Vac Input: 65kAIC- 120/208/240/480Vac 14kAIC- 600Vac 78kAIC - 600Vac NIA - 600Vac Output: 5kAIC - 125Vdc Output: 10kAIC - 250Vdc Output: 20kAIC - 250Vdc 10

Page l of 2

[ Enclosure S3]

Date:

C;DTECHN0L0GIES Standby Power Division December 9, 2020 Reynosa Reynosa Facility ATP-15 IEEE-1188-2005 test Cut-off 1.75 V.P.C.@ 100%, 225.3 Amp at Jhrs discharge rate For order Number: 2516069 Test date:Nov 2020 Discharge time (Temp corrected) :

Cell temperature at the beginning of the discharge (a verage) : 24"C Uncorrected test time = 180 minutes Temp. of the cell Cell voltage at the Com!Ction Conductance Fkm voltage before End voltage at 3 Time to ntaeh 1.750V % of cap at Final Float Serial No. before beginning of the Factor readings (0) dischargeM hours (180 min) tH,MM) 1.750V voltage discharge {°C) discharge (V) 1 H0904104 21 0.954 406-4 2.221 1.988 1.824 03:06:00 108.32% 2.158 2 H0904072 21 0.954 3971 2.221 1.989 1.800 03:00:00 104 .82% 2.156 3 H0904069 21 0.954 3977 2.224 1.989 1.817 03:04:30 107.44% 2.159 4 H0604338 21 0.954 4056 2.236 1.988 1.848 03:15:00 113.56% 2.157 5 H0702033 21 0.954 4023 2.227 1.978 1.822 03:08:30 109.77% 2.151 6 H0907031 21 0.954 3974 2.221 1.986 1.796 02:58:30 103.95% 2.145 7 H1023297 23 0.977 3719 2258 1.987 1.780 03:00:00 102.35% 2.166 8 H0914045 21 0.954 3955 2.215 1.985 1.800 03:00:00 104.82% 2.162 9 H0608202 21 0.954 4086 2.239 1.993 1.854 03:18:00 115.30% 2.161 10 H1023257 21 0.954 3953 2.215 1.991 1.831 03:09:30 110.35% 2.157 11 H1023011 23 0.977 3895 2.264 1.982 1.785 03:00:00 102.35% 2.150 12 H1023240 25 1.000 3938 2.209 1.988 1.776 03:03:30 101.94% 2.166 13 H0814180 21 0.954 4003 2215 1.984 1.807 03:00:00 104.82% 2.156 14 H1118511 21 0.954 3886 2215 1.981 1.811 03:01 :00 105.40% 2.1 40 15 H0608113 21 0.954 4112 2.236 1.984 1.8-40 03:13:00 112.39% 2.157 16 H1023333 25 1.000 3907 2.221 1.988 1.794 03:07:00 103.89% 2.161 17 H0904067 21 0.954 3958 2.227 1.986 1,815 03:02:30 106.28% 2.154 18 H1023374 25 1.000 3915 2.221 1.982 1.783 03:05:00 102.78% 2.160 19 H1 023247 25 1.000 3399 2258 2.017 1.836 03:19:00 110.56% 2.196 20 H1 023304 21 0.954 3867 2209 1.980 1.799 02:58:30 103.95% 2.156 21 H1023254 25 1.000 3861 2215 1.984 1.766 03:01 :30 100.83% 2.159 22 H1023248 25 1.000 3909 2.215 1.989 1.779 03:04:00 102.22% 2.165 23 H1023315 25 1.000 3879 2.209 1.983 1.762 03:01:30 100.83% 2.155 24 H1023381 25 1.000 3977 2.226 1.988 1.798 03:07:30 104.17% 2.159 25 H0914035 21 0.954 3949 2.221 1.987 1.819 03:04:30 107.44% 2.149 26 H1023320 25 1.000 3965 2.221 1.980 1.759 03:00:30 100.28% 2.153 27 H1023313 25 1.000 3902 2215 1.981 1.766 03:01 :30 100.83% 2.154 28 H1023191 25 1.000 3937 2.212 1.987 1.784 03:04:30 102.50% 2.155 29 H1023242 25 1.000 3831 2.219 1.987 1.784 03:04:30 102.50% 2.162 30 H1023375 25 1.000 3833 2.221 1.985 1.756 03:00:30 100.28% 2.164 31 H1023249 24 0.986 3915 2.215 1.988 1.787 03:03:00 103.11 % 2.156 32 H1 023332 24 0.986 3989 2.216 1.987 1.810 03:08:30 106.21 % 2.160 33 H1023193 25 1.000 3927 2.215 1.983 1.769 03:02:30 101 .39% 2.150 34 H1023251 24 0.986 3868 2.216 1.992 1.795 03:04:30 103.96% 2.169 35 H1023253 24 0.986 3901 2.215 1.986 1.781 03:01 :30 102.27% 2.162 36 H1023335 24 0.986 3980 2.215 1.985 1.799 03:05:00 104.24% 2.153 37 H1023331 24 0.986 4016 2.215 1.986 1.816 03:10:00 107.05% 2.157 38 H0702065 23 0.977 4036 2.269 1.982 1.823 03:09:30 107.76% 2.148 39 H0702076 23 0.977 3997 2.282 1.983 1.833 03:13:30 110.03% 2.159 40 H1023334 24 0.986 4001 2.221 1.986 1.815 03:09:30 106.77% 2.162 41 H1023182 23 0.977 3862 2.267 1.984 1.803 03:04:00 104.63% 2.152 42 H1023337 24 0.986 3989 2215 1.982 1.770 03:00:00 101 .42% 2.157 43 H0702077 23 0.977 4060 2.282 1.986 1.834 03:13:30 110.03% 2.148 44 H0604335 21 0.954 4056 2.239 1.982 1.838 03:12 :30 112.10% 2.158 45 H1022348 23 0.977 3973 2.269 1.989 1.822 03:08:30 107.19% 2.152 46 H1023302 23 0.977 3797 2.258 1.988 1.795 03:02:30 103.78% 2.160 47 H1023379 23 0.977 3883 2.277 1.996 1.834 03:12:30 109.46% 2.165 48 H0702156 21 0.954 3982 2233 1.974 1.814 03:04:30 107.44% 2.149 49 H0702029 23 0.977 3858 2.302 1.998 1.843 03:19:00 113.16% 2.172 50 H1023224 23 0.977 3820 2.253 1.983 1.791 03:02:30 103.78% 2.165

~-

Name and Signature of quality Manager

Paae2of2 Date:

C::DTECHN0L0GIES Standby Power Division December 9 , 2020 Reynosa Reynosa Facility ATP-15 IEEE-1188-2005 test Cut-off 1.75 V.P.C. @ 100%, 225.3 Amp at 3hrs discharge rate For order Number: 2516069 Test date:Nov 2020 Discharge time (Temp corrected) :

Cell temperature at the beginning of the discharge (average): 24*c Uncorrected test time= 180 minutes Temp. of the cell Cell voltage at the Correction Conductance Float voltage before End voltage at 3 TirM to reach 1.750V % of cap at Final Float Serial No. before begfflnfflg of the Factor readings discharge hou.-s (180 min) (H:MM) 1.750V voltage discharge discharge 51 H0702163 21 0.95'1 3967 2.227 1.975 1.816 03:06:00 108.32% 2 .148 52 H1023176 23 0.977 3816 2 .268 1.985 1.790 03:02 :00 103.49% 2 .159 53 H1023373 21 0.95'1 3897 2215 1.984 1.820 03:04:30 107.<< % 2.162 54 H1 022362 23 0.977 3949 2 .270 1.988 1.834 03:14:30 110.60% 2.160 55 H0702216 23 0.977 4086 2255 1.981 1.802 03:04:00 104.63% 2.140 56 H1023314 23 0 .977 3832 2251 1.985 1.798 03:03:00 104.06% 2 .160 57 H1023171 23 0.977 3871 2258 1.987 1.798 03:03:00 104.06% 2 .158 58 H0702079 23 0.977 4025 2267 1.988 1.830 03:12:00 109.18% 2.151 59 H1023183 23 0 .977 3898 2258 1.991 1.813 03:06:00 105.77% 2.155 60 H1109324 23 0.977 3939 2281 2.001 1.824 03:09:30 107.76% 2.159 This IEEE-1188-2005 Test Report confirms the (60) cells of model AT-lSP meets and exceeds C&D Technologies' published rate of 225.3A for 3 hours3.472222e-5 days <br />8.333333e-4 hours <br />4.960317e-6 weeks <br />1.1415e-6 months <br />.

[ Enclosure S4)

'i\l UL-Recognized Component / 0\

THE m*s*C.,,

SERIES VRLA BATTERY THE TRUE LONG LIFE BATTERY' For SwitchGear and Control CAPACITIES FROM 345 TO 2180 Ampere-Hours The msEndur II is the latest FEATURES & BENEFITS advancement in battery technology with enhanced features for ADVANCED SYSTEM FEATURES

• Highly efficient, proprietary plate processing for high utilization of active Utility applications.

• Modular design for ease of installation material - results In high energy density and stacking flexibility and low float current By combining the service life

• Space saving design for the greatest reliability of a flooded battery with amount of power in a small footprint ADVANCED PROCESSES the performance energy density of a

• Exceeds 1997 USC Zone 4 seismic

• Advanced formation process results in valve-regulated battery, C&D has requirements for at or below grade a narrow float voltage window making installations on-site float matching unnecessary created the msEndur II - The True long-Life BatteryTM.

• Certified as NESS Level 3 and

• Highly controlled manufacturing Highly compliant to Earthquake Risk Zone 4 processes for exceptional and consistent In various system configurations plate quality The msEndur 11 series of batteries are unmatched in power density with

• Exceeds 2006 IBC requirements up to ADVANCED SERVICE LIFE & WARRANTY 3X>% g level and Z007 CBC compliant space saving modular designs and

• Proprietary cell design and manufacturing have a 20-year design life to reduce the

• Tin-plated copper alloy connectors process provides for 20 year desi!jn life minimize maintenance and documented long-lasting service life total cost of ownership.

• New C&D Ohmic Ring for ease of

• Best 2V VRLA Warranty in the Market With its much lower float current, the maintenance readings. Wrth specially 7 years full warranty for float service adapted probes only one technician 1s applications msEndur II yields significant electrical required to take readings.

costs savings over its life making it ADVANCED EXPERIENCE more environmentally friendly than ADVANCED MATERIALS

• Over 100 years of experience in the other 2V VRLA batteries.

• Advanced micro-porous Absorbed battery industry

~lass Mat separators for ultra-low float current - reduces grid corrosion

• The only producer and marketer of APPLICATIONS for a long, usable service life complete battery and electronics systems for total power solutions

• Electric Utility Substations

• Proprietary calcium alloys to minimize positive grid corrosion and growth -

• Fully backed by a worldwide network for

• Telephone Backup maximizes battery life local service

• Microwave Sites

• Robust polypropylene container

• Signaling Sites and cover - enhances product quality

• Offshore Platforms and Improves strength of materials for safe operation with flammability rating

• Mines UL94 VO, LOl>28%

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CONSTANT CURRENT DISCHARGE RATINGS FY/Cell Model 1 min 1 hr 2hr 3hr 4hr 5hr 6hr 8hr 10hr 12 hr 24hr AT-07P 396.6 189.3 122.7 92.5 74.8 63.0 54.5 43.1 35.6 30.4 16.2 AT-09P 529.7 259.3 170.2 128.7 104.2 878 75.9 60.0 49.6 42.3 22.6 AT*11P 662.1 324.1 212.7 160.9 130.2 109.7 94.9 74.9 62.0 52.9 28.2 AT-13P 737.1 352.1 228.2 172.1 139.2 117.2 101.4 80.1 66.3 56.6 30.2 AT-15P 927.0 453.7 297.8 225.3 182.3 153.6 132.9 104.9 86.3 74.1 39.5 AT-17P 1057.6 504.8 327.2 246.8 199.6 168.1 145.4 114.8 95.0 81.1 43.3 AT-19P 1191 .9 583.4 382.8 289.6 234.4 197.5 170.9 134.9 111.6 95.2 50.8 1.67 AT-21P 1322.0 631.1 409.0 308.5 249.5 201 .1 181 .9 143.5 118.8 101.4 54.1 AT-23P 1456.7 713.0 467.9 354.0 286.5 241.4 208.9 164.9 136.4 116.4 62.1 AT-25P 1586.4 757.3 490.8 370.2 299.3 252.1 218.1 172.2 142.5 121.6 64.9 AT-27P 1721 .6 842.6 553.0 418.4 338.6 285.3 246.8 194.9 161 .2 137.6 73.4 AT-29P 1850.8 883.5 572.7 431.9 349.2 294.1 254.5 200.9 166.3 141.9 75.8 AT-35P 1101.9 723.3 547.1 442.8 373.0 322.8 254.8 210.8 179.9 96.0 AT-39P 1199.0 777.2 586.1 474.0 399.2 345.4 272.7 225.6 192.9 102.8 FY/Cell Model 1mln 1 hr 2hr 3 hr 4 hr 5hr 6hr 8hr 10 hr 12 hr 24hr AT-07P 357.6 181.0 118.1 89.5 72.7 61.4 53.3 42.3 35.1 30.0 16.2 AT-09P 477.5 247.6 163.8 124.6 101 .2 85.6 74.3 58.9 48.9 41.8 22.5 AT-11P 596.8 309.5 204.6 155.7 126.6 107.0 92.8 73.6 61 .1 52.3 28.1 AT-13P 665.2 336.6 219.7 166.5 135.2 114.3 99.2 78.7 65.3 55.9 30.1 AT-15P 835.6 433.3 286.6 218.0 177.2 149.8 130.0 103.1 85.5 73.2 39.3 AT-17P 953.7 482.6 314.9 238.8 193.9 163.9 142.2 112.8 93.6 80.1 43.1 1.78 AT-19P 1074.3 557.2 368.5 280.2 227.8 192.6 167.1 132.5 110.0 94.1 50.6 AT-21P 1192.1 603.3 393.7 298.4 242.4 204.8 177.7 141.0 117.0 100.1 53.9 AT-23P 1313.0 681 .0 450.4 342.5 278.4 235.4 204.2 161.9 134.4 115.0 61 .8 AT-25P 1430.5 723.9 472.4 358.1 290.8 245.8 213.3 169.2 140.4 120.2 64.6 AT-27P 1551 .8 804.8 532.3 404.8 329.1 278.2 241 .4 191 .4 158.8 135.9 73.0 AT-29P 1669.0 844.6 551 .1 417 8 339.3 288.8 248.8 197.4 163.8 140.2 75.4 AT-35P 1052.4 696.0 529.4 430.3 363.8 315.6 250.3 207.7 177.7 95.5 FY/Cell Model 1 min 1 hr 2 hr 3hr 4 hr 5hr 6hr 8hr 10 hr 12 hr 24hr AT-07P 331 .9 175.7 115.0 87.5 71.2 60.4 52.5 41.8 34.7 29.8 16.1 AT.09P 442.9 240.4 159.6 121 .7 99.2 84.1 73.1 48.4 48.4 41.5 22.4 AT-11P 553.7 300.5 199.5 152.2 124.0 105.1 91.4 60.5 60.5 51.8 28.0 AT-13P 617.4 326.8 214.0 162.7 132.5 112.3 97.6 64.6 64.6 55.4 30.0 AT-15P 775.1 420.6 279.3 213.1 173.7 147.2 127.9 84.7 84.7 72.6 39.2 AT*17P 885.1 468.6 306.8 233.3 190.0 160.9 139.9 92.7 92.7 79.4 43 .0 AT-19P 996.6 5408 359.1 273.9 223.3 189.2 164.5 108.9 108.9 93.3 50.4 1.80 AT-21P 1106.4 !585.7 383.5 291.6 237.5 201 .2 174.9 115.8 115.8 99.3 53.7 AT-23P 1218.1 661 .0 438.9 334.8 272.9 231.2 201 .1 133.0 133.0 114.0 61 .6 AT-25P 1327.6 702.8 460.2 349.9 285.0 241.4 209.9 139.0 139.0 119.1 64.5 AT-27P 1439.6 781.2 518.7 395.7 322.5 273.3 237.6 157.2 157.2 134.7 72.8 AT-29P 1548.9 820.0 536.9 408.3 332.5 281.7 244.9 162.2 162.2 139.0 75.2 AT-35P 1021.6 678.3 517.4 421 .8 357.4 310.7 205.6 205.6 176.2 95.3 AT-39P 1112.8 728.6 554.1 451 .8 382.2 332.4 220.1 220.1 188.7 102.1 FY/Cell Model 1 min 1 hr 2 hr 3hr 4 hr 5hr 6 hr 8hr 10 hr 12hr 24 hr AT-07P 319.5 172.7 113.7 86.5 70.4 59.7 51 .9 41.3 34.3 29.4 15.9 AT-09P 426.5 235.8 157.5 120.3 98.1 83.1 72.3 57.5 47.8 41 .0 22.1 AT-11P 533.1 294.7 196.9 150.4 122.6 103.9 90.3 71.9 59.8 51.2 27.7 AT-13P 594.3 321 .2 211.4 160.9 131.0 111.0 96.5 76.8 63.9 54.8 29.6 AT-15P 746.3 412.6 275.7 210.5 171.7 145.5 126.5 100.6 83.7 71.7 38.8 AT-17P 852.0 460.5 303.1 230.6 187.8 159.1 138.4 110.1 91 .6 78.5 42.5 AT-19P 959.6 530.5 354.4 270.7 220.7 187.0 162.6 129.3 107.6 92.2 49.8 1.81 A1'-2tf> 1065.0 5756 378.9 288.3 234.8 198.9 172.9 137.6 114.5 98.1 53.1 AT-23P 1172.8 648.4 433.2 330.8 269.8 228.6 198.8 158.1 131.5 112.7 60.9 AT-25P 1278.0 960.7 454.7 346.0 281 .8 238.7 207.5 165.1 137.4 117.7 63.7 AT-27P 1386.0 766.3 511 .9 391.0 318.8 270.2 234.9 186.8 155.4 133.2 72.0 AT-29P 1491 .0 805.8 530.4 403.6 328.7 278.5 242.1 192.6 160.3 137.4 74.3 AT-35P 1002.1 669.5 511 .3 416.9 353.3 307.2 244.3 203.2 174.1 94.1 AT-39P 1093.6 719.9 547.8 446.1 377.9 328.6 261 .4 217 .5 186.4 100.9 12-1016/1015/CD 2 www.cdtechno.com

Please refer to the msEndur II Performance Specifications Brochure, 12-1015, for an expanded list of constant power and constant current ratings and end voltages.

You may also access the 'p roduct ratings by logging onto the C&D Battery Sizing Program at www.cdstandbypower.net SPECIFICATIONS AND CHARACTERISTICS Cells, Voltage per Unit 1 cell, 2 VDC Nominal Recommended Operating Temperature 77°F (25°C)

Recommended Float Charging Voltage 2.25 - 2.27 VPC at 77°F (25°C)

-2mV/cell/°F above 77°F (-3.6mV/cell/°C above 25°C)

Charger Compensation Temperature/ Voltage

+2mV/celV°F below 77°F (+3.6mV/cell/°C below 25°C)

Initial: 160 in-lbs (18 N-m)

Connection Torque Re-torque: 125 in-lbs (14 N-m)

Pressure Release Vent with proven High Capacity tin plated Copper Insert service in the field for over 15 years 0.75" Diameter (20% larger than msEndur)

Color coded tenninal polarity Interlocking Rib Container to Cover Seal Thennally Welded with Joint Skirt ensuring leak free operation MSE-AT Active Material Low Float Current Design SR-4228 Tested Thick Walled Flame Retardant Polypropylene container &

cover. UL VO - 28 LOI. More than Absorbent ,Glass Mat separator 20 years proven field history. C-wrapped to ensure plate isolation &

Retains durability with age and in optimized to reduce oxygen transfer cold environments Outward protruding tin plated copper terminal with C&D Ohmic Ring for Molded in Tin-lead bushing with multiple ease of measurements during maintenance seal rings to ensure a leak free seal Thennal bonded case to cover seal 100%

factory tested with Helium Leak Detection & Terminal post High Voltage leak testing.

12-1016/1015/CD 3 www.cdtechno.com

MODULES msEndur II cells are designed to be mounted in stackable modules of either 3, 4, 5, 6, 8 or 10 cells.

The specific system configuration is flexible and can be configured to best match the physical requirements of the customer's site.

Detailed system dimensions and combinations are available in the msEndur II Module Brochure 12-1014.

SERVICE LIFE - Reliability The msEndur II is the latest advancement in battery technology. By combining the service life reliability of a flooded battery with the performance energy density of a valve-regulated battery C&D has created the msEndur 11- The True Long-Life Battery'. The msEndur II series of batteries are unmatched in power density with space saving modular designs and have a 20-year design life to reduce the total cost of ownership.

Has the light turned on yet?

Both devices ca save you 75%

Sta rd 2 VRJ..A The msEndur II VRLA battery is the environmentally friendly battery that saves you money in normal operation .

The same low float current that ensures a twenty year life, is good for the environment and saves money

• Up to 75% lower float current

• Consumes up to 75% less electricity

• Lower float current generates less heat

• Less heat generated reduces required air conditioning

• Less electricity consumed in float charging and air conditioning = reduce carbon emissions C:DTKHNOlOGIES, INC. Any data, desaiptions or apecfficatJons presented herein are subject to revision by C&D Technologies. Inc. wtthout notice. While such intormaUon Is believed to be accurate as indicated herein. C40 Technologles. Inc. makes no warranty and hereby dlsdalms all warranUes, express or mplled, with regard 10 the accuracy or completeness of such 1400 Union Meeting Road information . Further, because the p,oduct(s) featured herein may be used under conditions beyond tts con1rol, C&O Techn~ogies, Inc. hereby dlsclalms all warranties, either express or P.O. Box 3053

• Blue Bell, PA 19422-0858 knplled , concemlng the fiineu orsultabilty of SUCh product(s) for any parUcular use or in any (215) 619-2700

• Fax (215) 619-7899 * (800) 543-8630 apeclfic application or arising f rom any course of dealfng or usage of trade. The user ls solely respons/ble for determinlng the aultabillty of the product(&) featured herein for user's Intended customersvc@cdtechno.com purpose and in user's apecHlc application.

www.cdtechno .com Copyright 2012 C&O TECHNOLOGIES, INC. Printed In U.S.A. 12-1016 1015/CO