ML15058A714

Response to NRC Request for Additional Information

ML15058A714
Person / Time
Site:	National Bureau of Standards Reactor
Issue date:	02/26/2015
From:	Dimeo R M US Dept of Commerce, National Institute of Standards & Technology (NIST)
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
Download: ML15058A714 (24)

Text

UNITED STATES DEPARTMENT OF COMMERCENational Institute of Standards and Technology1 A Gaithersburg, Maryland 20899-February 26, 2015Document Control DeskU.S. Nuclear Regulatory CommissionWashington, DC 20555-0001

Subject:

NRC Request for Additional InformationDocket No. 50-184Gentleman:In response to your letter of January 30, 2015, please find enclosed the NIST Center for NeutronResearch (NCNR) answers to the RAI for the license amendment request to change two technicalspecifications for the station battery. Any questions regarding the NCNR response should be directedto Dr. Paul Brand, Acting Chief, Reactor Operations and Engineering. Dr. Brand may be reached atpaul.brand@nist.gov or (301) 975-6257.Sincerely,Robert M. Dimeo, DirectorNIST Center for Neutron ResearchI certify under penalty of perjury that the following is true and correct.Executed onFEB 2 G) 2015By: Uzi &-cc: Xiaosong Yin, Project ManagerN I"S Response to RAI of January 30, 2015NATIONAL INSTITUTE OF STANDARDS AND TECHNOLOGYTEST REACTOR1. On page 1 of the LAR, you proposed to replace both NBSR's UPS that supplyemergency alternating current (AC) electrical power to reactor critical loads.NUREG-1 537, Part 1, Section 8.2, "Emergency Electrical Power Systems," states thatthe information contained in this section should be "commensurate with required designbasis developed in other chapters of the SAR."a) Provide an overview of the systems that are affected by this LAR.b) Provide a one-line diagram that shows the current and the proposed configurationsof the UPS system including the station battery, direct current (DC) DistributionPanel, and Critical Power Panel.Answer to Questions 1 a and 1 b: Please see the attached drawings, Before Configurationand After Configuration. Electrical loads, motor control centers, switchboards, etc. were notaffected by this change.The two existing 20 kVA UPS, T9 and T10, were replaced with two 20 kVA UPS of adifferent design but of the same output capacity. The replacement UPS are designated asMAIN UPS and STANDBY UPS.Battery power was changed from the existing 60-cell lead-antimony battery bank to theexisting 60-cell lead-antimony battery bank + a 72 cell VRLA bank + a spare 72 cell VRLAbattery bank. Previously, the Station Battery = 60-cell battery bank; now the Station Battery= 60-cell battery bank + one VRLA battery bank. No credit for battery power is taken for thespare VRLA battery bank.The 60-cell battery charging capability of T9 UPS was replaced with a stand-alone batterycharger and the 60-cell battery charging capability of the T10 UPS was also replaced with astand-alone battery charger. In addition, the charging configuration for the 60-cell batterybank has been changed. T9 UPS'and T10 UPS were not in service at the same time; T9 orT10 charged the 60-cell battery. The replacement chargers operate in parallel, bothcharging the battery, with one charger nominally the primary charger.2. On page 1 of the LAR, it states:"Two redundant battery chargers will be purchased and installed to replace the functionpreviously provided by the T-9 and T-10 UPS. The two replacement UPS are state-of-the-art systems with valve-regulated lead acid (VLRA) or sealed batteries rather thanflooded or wet lead acid batteries. Each of the redundant UPS and batteries are capableof carrying the 20 kVA (design basis value for NBSR) of AC reactor critical power loadsfor 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> (assumes full 20 kVA loading) independently."NUREG-1537, Part 1, Section 8.2, "Emergency Electrical Power Systems," states thatthe information contained in this section should "present a detailed functional descriptionand circuit diagram."

Ia) Clarify if the battery charger and the VLRA battery are included in the UPS unit.Also, provide a simplified block diagram that shows how the UPS, the VLRA battery,and the battery charger are interconnected.Answer to Question 2.a: The stand-alone battery chargers are not included in the UPSunit and those battery chargers have no interaction with the UPS. A VLRA battery bankis part of an UPS and is charged only through the UPS of which the bank is part. Seethe excerpts, including simplified block diagrams, from the UPS manual in Attachment 2.b) Provide manufacturer ratings and specifications of the battery chargers, UPS, andthe VLRA batteries.Answer to Question 2.b: See Attachment 3.c) Provide a summary of the calculation performed to determine the adequacy of thenew equipment (i.e. battery chargers, UPS, VRLA batteries) to supply the reactorcritical loads.Answer Question 2.c: No detailed calculation was performed for the replacement batterychargers. Each stand-alone battery charger was specified for the same input and outputcapability as the T9 and T10 UPS, which previously maintained the charge on the 60-cellbattery bank through the output of the rectifier of the selected UPS. The adequacy ofthe battery charger design was confirmed after the installation of the battery chargers.After the chargers were connected to the 125 VDC distribution panel, the batterychargers had a positive DC current indicated with an output voltage of approximately128 VDC, and the 60-cell battery terminal voltage increased to 128 VDC. The estimatedcurrent draw from the required DC loads, the motors for EF-5 and EF-6, is approximately4 amps at 115 VDC, well within the capacity (108 amps continuous for 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br />) of the60-cell battery bank.No calculation was performed for the replacement UPS. The replacement 20 kVA UPSare of a different design than the replaced UPS, but of the same output capacity. Thevendor confirmed the operability of the non-battery section of the UPS duringcommissioning of the UPS and there was, and has been, no effect upon operability ofthe AC loads on the output of the UPS after the UPS were placed into service.The lifetime of the VRLA battery bank was provided by the manufacturer as 124 Ah for20 hours, or 24.8 Ah for 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br />, assuming a linear discharge rate. The manufacturer'svalue for the necessary AC output from the battery bank was checked using a simpleequation for the continuous AC power requirement for the UPS: Assuming a powerfactor of 1, then 20 kVA = 31/2 X I x E, or; 20000 = 31/2 x I x 480, or; I = 24 ampscontinuously. This is consistent with the manufacturer's value for the battery bank for a4 hour minimum battery bank lifetime. The estimated current draw from the nuclearinstrumentation, the only required AC load, is 3 amps at 115 VAC, well within thecapacity of the VRLA battery bank.

The capability of the MAIN UPS VRLA battery bank was confirmed with a discharge testcompleted on September 5, 2014. The test procedure placed CP-1, CP-2, CP-3, andthe Rod Drive Power and Controller as loads (see page 2 of Attachment 1) on theoutput of the MAIN UPS. With an AC input to the UPS, a battery voltage and current of498 V and 0 amps was recorded from the UPS control panel, along with a batterylifetime of 481 minutes calculated by the UPS software. The battery bank was in thisstarting condition of peak voltage and zero amp discharge current, because the ACinput was providing all of the AC output and providing a trickle charge to the VRLAbattery bank. The AC input was then removed from the UPS, placing the described loadon the VRLA battery bank of the MAIN UPS. An initial DC voltage and current of 455 Vand 15 amps was recorded, along with a calculated battery life of 419 minutes. After 4hours, the voltage was 446 V, the current was at 14.7 amps, and the battery lifetime wascalculated at 257 minutes. The VRLA battery bank would provide an estimated 8 hour9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br />sof power to all of the AC loads described as critical; clearly, the battery bank can powerthe nuclear instrumentation, the only required AC load, for at least 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br />. A test of theSTANDBY UPS VRLA battery bank was performed on November 11, 2014. Similarresults were obtained.3. The current Technical specification (TS) 4.6, "Emergency Power System" requirestesting the voltage and specific gravity of each cell of the station battery annually. Theproposed revised TS 4.6 does not include these requirements for the VRLA battery. Youclarified that the specific gravity of the VRLA battery cannot be measured because theelectrolyte of the VRLA battery is immobilized in an absorbed glass matte (AGM).However, you provided no justification for omitting testing of the VRLA battery cellvoltage.NUREG-1537, Par 1, Section 8.2, "Emergency Electrical Power Systems," states thatthe information contained in this section should "also identify the. .., important designparameters, and surveillance and inspection functions that ensure operability of theemergency electric power systems..."Provide the TS requirement for testing the VRLA battery cell voltage. If this testing is notrequired for the VLRA battery, provide justification for deviating from the requirement ofthe current TS 4.6.Answer to Question 3: Battery cell voltage may be used as an indicator of individual celldegradation. It is not necessarily an indicator of battery bank capacity falling belowminimum output. Individual cell battery failures in existing VRLA battery banks at theNCNR have been insignificant in number. A two year discharge test is sufficient toreveal failing or failed battery cells, after which any failed cell would be identified. Fordetails, see answer to question 5.4. On page 1 of the LAR, the licensee states: "The NCNR [NIST Center for NeutronResearch] is not replacing the existing flooded lead acid battery (Vented Lead Acid orVLA), designated as the Station Battery in the Safety Analysis Report, because it isrequired to supply the various emergency loads that operate on 125 VDC."'

a) Provide a copy of the sections of the above Safety Analysis Report (SAR) that arerelated to NIST emergency electrical power systems including the UPS, the batterychargers, and the station batteries. Also, provide a markup of the changes made tothe affected sections as a result of this amendment request.Answer to 4.a: See Attachment 4.b) Clarify whether the VRLA batteries supply the various emergency loads served bythe Station Battery at any time.Answer to 4.b: The VRLA batteries do not supply all of the required loads. See theanswer to question 1 for the definition of the station battery. The VRLA batteries for theMAIN UPS provide power only to the AC loads and only when the normal (MCC B6) ACinput is lost to the MAIN UPS. After the MAIN UPS batteries are fully discharged, theSTANDBY UPS will provide AC power to the output of the MAIN UPS. For thesequence of AC power to the AC critical loads, see section 8.1.2.4 in the SAR excerpt inthe answer to question 4.a.5. On page 1 of the LAR, you stated that the VLRA maintenance guidance found in theInstitute of Electrical and Electronics Engineers (IEEE) standard 1188-2005, "IEEERecommended Practice for Maintenance, Testing, and Replacement of Valve-RegulatedLead-Acid (VRLA) Batteries for Stationary Applications," will be used for the VLRAbatteries. As described in the IEEE standard 1188-2005, a service test is a test of thebattery's ability, as found, to satisfy the design requirements (battery duty cycle) of theDC system.Provide an explanation why a service test was not included in TS 4.6.Answer to Question 5: VRLA batteries have been used for as many as ten years in twoUPS, unrelated to the UPS in the LAR, dedicated as backup power for the NCNRcomputers, experimental equipment, and data retention. The original and replacementbattery banks have been replaced at intervals of greater than 5 years. Service recordsfor these batteries show the banks have not degraded below their minimum capacityprior to replacement. In addition, of the 276 battery cells replaced during the three fullbank replacements, 272 were in a satisfactory condition when replaced.The VRLA battery banks do not warrant a service test because of:* The small number of cell failures for a bank of VRLA battery cells.* The number of VRLA battery cells.* The increase in necessary battery power from a supply of 100 amps/hour for aload of 8 amps/hour to a supply of 100 amps/hour for a load of 4 amps/hour (seequestion 2 answer), i.e. a doubling of the cells available for the same load.

ATTACHMENT 1BEFORE Configuration of UPS (battery charger) and Station Battery0'CY0 < -6Ci 11 Z1-1 ATTACHMENT 1AFTER Configuration of UPS, Battery Chargers, and Station Battery094" U III1-2 ATTACHMENT 2Annotated Excerpt from EATON 9390 UPS Installation and Operation Manual7.1.2 Normal Mode -RTFigure 7-2 shows the path of electrical power through the UPS system when the UPSis operating in Normal mode.StaticK5SwitchOff-site power or Rectifier Inverteremergency generator K1 ACAC DC NuclearI InstrumBatteryCMain Power FlowBreakers Contactors Trickle Current66 -J- Closed BatteryBreaker Energizedo o -[open_ _ _ _ De-EnergizedBatteryFigure 7-2. Path of Current through the UPS in Normal Mode -RTDuring normal UPS operation, power for the system is derived from a utility inputsource through the rectifier input contactor K1. The front panel displays "Normal,"indicating the incoming power is within voltage and frequency acceptance windows.Three-phase AC input power is converted to DC using IGBT devices to produce aregulated DC voltage to the inverter. The battery is charged directly from theregulated rectifier output through a buck or boost DC converter, depending onwhether the system is 208V, 380V, 400V, 415V, or 480V and the size of the batterystring attached to the unit.The battery converter derives its input from the regulated DC output of the rectifierand provides either a boosted or bucked regulated DC voltage charge current to thebattery. The UPS monitors the battery charge condition and reports the status on thecontrol panel. The battery is always connected to the UPS and ready to support theinverter should the utility input become unavailable.The inverter produces a three-phase AC output to a customer's load without the use of atransformer. The inverter derives regulated DC from the rectifier and uses IGBT devicesand pulse-width modulation (PWM) to produce a regulated and filtered AC output. TheAC output of the inverter is delivered to the system output through the output contactorK3.If the utility AC power is interrupted or is out of specification, the UPS automaticallyswitches to Battery mode to support the critical load without interruption. When utilitypower returns, the UPS returns to Normal mode.ents2-1 ATTACHMENT 2Annotated Excerpt from EATON 9390 UPS Installation and Operation Manual7.1.5 Battery Mode -RTThe UPS automatically transfers to Battery mode if the AC input is lost. In Batterymode, the battery provides emergency DC power that the inverter converts to ACpower.Figure 7-5 shows the path of electrical power through the UPS system whenoperating in Battery mode.StaticNo Eýoff-site power or Switchemergencygenerator power Rectifier InverterK1DC AC K3 NulaInstrumeBatteryConverterIMain Power FlowBreakers Contactors Trickle Current~ Jj-ClosedC e CI Energizedo o -[-OpenDe-EnergizedBattery dischargingFigure 7-5. Path of Current through the UPS in Battery Mode -RTDuring a loss of AC, the rectifier no longer has an AC source from which to supply theDC output current required to support the inverter. The input contactor K1 opens andthe battery instantaneously supplies energy to the battery converter. The convertereither bucks or boosts the voltage so that the inverter can support the customer'sload without interruption. If bypass is common with the rectifier input, the backfeedprotection contactor K5 also opens. The opening of contactors K1 and K5 preventsystem voltages from bleeding backwards through the static switch and rectifiersnubber components and re-entering the input source.While in Battery mode, the UPS sounds an audible horn, illuminates a visual indicatorlamp on the front panel (System Normal, On Battery), and creates an entry into thealarm event history. As the battery discharges, the converter and inverter constantlymake minute adjustments to maintain a steady output. The UPS remains in thisoperating mode until the input power to the rectifier is again within the specifiedvoltage or frequency acceptance windows.If the input power fails to return or is not within the acceptance windows required fornormal operation, the battery continues discharging until a DC voltage level is reachedwhere the inverter output can no longer support the connected loads. When thisevent occurs, the UPS issues another set of audible and visual alarms indicatingSHUTDOWN IMMINENT. Unless the rectifier has a valid AC input soon, the outputcan be supported for only two minutes before the output of the system shuts down.If the bypass source is available, the UPS transfers to bypass instead of shuttingdown.nts2-2 ATTACHMENT 2Annotated Excerpt from EATON 9390 UPS Installation and Operation ManualIf the UPS becomes overloaded or unavailable, the UPS switches to Bypass mode.The UPS automatically returns to Normal mode when the overload condition iscleared and system operation is restored within specified limits.If the UPS suffers an internal failure, it switches automatically to Bypass mode andremains in that mode until the failure is corrected and the UPS is back in service.7.1.3 Bypass Mode -RTThe UPS automatically switches to Bypass mode if it detects an overload, load fault,or internal failure. Figure 7-3 shows the path of electrical power through the UPSsystem when operating in Bypass mode.The critical load is not protected while the UPS is in Bypass mode.ACOff-site power orACthrough thestandby UPSK1NuclearInstrumentsK3SMain Power FlowBreakersContactors-W ClosedTrickle CurrentEnergized0 0 -- OpenDe-EnergizedFigure 7-3. Path of Current through the UPS in Bypass Mode -RT2-3 ATTACHMENT 3Battery ChargerSPECIFICATIONS (annotated)Except as noted, all specifications apply at:770 F / 250 C, nominal ac line voltage & nominal float voltageSpecification Conditions 12 Vdc 24 Vdc 48 Vdc 130 VdcVac +10%, -12%Output voltage regulation 0 to 100% load +/-0.25%Temp. 32-1220 F / 0-501 C (see product literature for specific data)Freq. 60 +/- 3 Hz20-100% load change, Output voltage change +/- 4% maximumTransient response with battery connected Recovery to +/- 2.0% in 200 msRecovery to +/- 0.5% in 500 msEfficiency All ratings 82-90%Unfiltered (with battery) 1% ms (typ.) 2% msat battery terminals30 mV rms (max.) 100 mVOutput ripple voltage Filtered (with battery) at ry tma ls(per NEMA PE5-1996) at battery terminalsFiltered (without battery) 1% rms (typ.) 2% rmsBattery Eliminator Filter 30 mV ms 100 mVOption (without battery) ICurrent Limit Iadjustable 50-110 % of rated output currentSoft start 0 to 100% load 4 secondsFloat 11.0-14.5 22.0-29.5 44.0-58.0 110-141e Equalize 11.7-16.0 23.4-32.0 46.8-61.0 117-149Voltage adjustment rangesEqaie_____________High DC Voltage alarm 12-19 24-38 48-76 120-175Low DC Voltage alarm 7-14.5 15-29.5 30-58 80-141Voltmeter range (Vdc) 0-21 0 0-42 0-75 1 0-19525 Adc nom. output 0 -3030-100 Adc nom. output 0 -150Ammeter range (Adc) 125-400 Adc nom. output 0- 500500-800 Adc nom. output 0- 10001,000 Adc nom. output 0 -1,200Surge withstand capability test perANSI C37.90.1-1989 no erroneous outputsReverse current from ac input power failure, 90 mA maximumbattery no options installedAudible noise average for four (4) sides, less than 65 dBA5ft / 1.5m from enclosureCooling natural convectionAmbient temperature operating 32-1220 F / 0-50° CElevation 3,000ft / 1,000m without deratingRelative humidity 0 to 95% non-condensingAlarm relay contact rating 1120 Vac / 125 Vdc 0.5A resistive3-1 ATTACHMENT 3Battery ChargerRECOMMENDED FLOAT AND EQUALIZE VOLTAGES (annotated)This table contains suggested values for commonly used batteries. Consult your batterymanufacturer's documentation for specific values and settings for your battery type.Battery Cell Type Recommended RecommendedFloat Voltage/cell Equalize Voltage/cellAntimony (1.215 Sp. Gr.) 2.17 2.33Antimony (1.250 Sp. Gr.) 2.20 2.33I- Selenium (1.240 Sp. Gr.) 2.23 2.33 -2.40"* Calcium (1.215 Sp. Gr.) 2.25 2.33Calcium (1.250 Sp. Gr.) 2.29 2.33* , Absorbed / Gelled Electrolyte

• 2.25 *(sealed lead-acid type) 2.25Nickel-Cadmium (Ni-Cd) 1.42 1.47* Sealed lead-acid battery types should not be used in ambient temperatures above 950F / 350 C, and should not normally be equalized. Consult your battery manufacturer'sdocumentation for specific equalizing recommendations.TEMPERATURE COMPENSATION (annotated)If your batteries are to see temperature variations during charging, a temperaturecompensation option (EJ5033-0#) is recommended. If this option is not part of yourAT30, manual adjustments should be made. Refer to the equation and table below fortemperature-adjusted voltages.temperature-adjusted voltage = charge voltage x KTemperature Temperature K K(OF) (°C) (Lead-Acid) (Nickel-Cadmium)35 1.7 1.058 1.04445 7.2 1.044 1.03455 12.8 1.031 1.02365 18.3 1.017 1.01375 23.9 1.003 1.00277 25.0 1.000 1.00085 29.4 0.989 0.99295 35.0 0.975 0.981105 40.6 0.961 0.9703-2 ATTACHMENT 3EATON 9390-40 Product Specifications (annotated)The UPS systems are housed in free-standing cabinets with safety shields behind thedoors. The UPS systems are available in 50/60 Hz with various output power ratings.9390-40120 20 kVA 50/60 Hz9390-40/30 30 kVA 50/60 Hz9390-40/40 40 kVA 50/60 Hz9390-80/40 40 kVA 50/60 Hz9390-80/50 50 kVA 50/60 Hz9390-80/60 60 kVA 50/60 Hz9390-80/80 80 kVA 50/60 HzThe following sections detail the input, output, environmental, and batteryspecifications for the UPS.UPS System InputOperating Input Voltage 208 Vac for operation from 177 Vac to 229 Vac(Nominal +10/-15%) 220 Vac for operation from 187 Vac to 242 Vac380 Vac for operation from 223 Vac to 418 Vac400 Vac for operation from 340 Vac to 440 Vac415 Vac for operation from 353 Vac to 457 Vac480 Vac for operation from 408 Vac to 528 VacOperating Input Frequency +/-5 HzRangeOperating Input Current See Appendix A, Table H through Table J.Reduced for GeneratorAdjustableInput Current Harmonic 5% THD at full loadContentPower Factor Minimum 0.99Line Surges 6 kV OC, 3 kA SC per ANSI 62.41 and IEC 801-4Battery Voltage 384 Vdc (208V/220V units only)432 Vdc480 Vdc3-3 ATrACHMENT 3UPS System OutputUPS Output Capacity 100% rated currentOutput Voltage Regulation +/-1-% (10% to 100% load)Output Voltage Adjustment 208 Vac nominal, adjustable from 202 Vac to 214 Vac(Nominal +/-3%) 220 Vac nominal, adjustable from 214 Vac to 226 Vac380 Vac nominal, adjustable from 369 Vac to 392 Vac400 Vac nominal, adjustable from 388 Vac to 412 Vac415 Vac nominal, adjustable from 403 Vac to 428 Vac480 Vac nominal, adjustable from 466 Vac to 494 VacOutput Voltage Harmonic 1.5% max THD (linear load)Content 5% max THD (nonlinear load)Output Current See Appendix A, Table H through Table J.Output Voltage Balance 3% for 100% maximum load imbalance (linear load)Output Voltage Phase 3' for 100% maximum load imbalance (linear load)DisplacementOutput Transients +/- 5% for 100% load step or removalFrequency Regulation +/- 0.01 Hz free runningSynchronous to Bypass Bypass within voltage limits of +5%, -8% of output setting; bypasswithin +/-0.5 HzFrequency Slew Rate 1 Hz per second maximumOverload Current Capability 102% for 10 minutes 100-101.9%110% for 30 seconds 102-109.9%125% for 10 seconds 110-124.9%>125% for 10 cyclesEnvironmentalOperating Temperature 0 to 40°C (32-104*F) without derating, excluding batteries. Therecommended operating temperature is 25°C (77°F).Operating Altitude Maximum 1500m (5000 ft) at 40°C without deratingStorage Temperature -25 to +60*C, excluding batteries (prolonged storage above 40*Ccauses rapid battery self-discharge)Relative Humidity (operating 5% to 95% maximum noncondensingand storage)Acoustical Noise 65 dB at a Im distance, c weightedEMI Suppression EN62040-2:2006 CATC3Electrostatic Discharge (ESD) Meets IEC 801-2 specifications. Withstands up to 25 kV pulse withoutImmunity damage and with no disturbance or adverse effect to the critical load.3-4 ATTACHMENT 3Eaton 12V 500W Battery (annotated)Features" Designed for high power density applications" Small volume, lightweight discharge efficiency" Can be used for more than 260 cycles at 100% discharge incycle service* UL-recognized components under UL924 and certified byISO 9001 and ISO 14001" Built to comply with IEC 896-2, DIN 473534 BS 6290 OT4,Eurobat* Exclusive three-year battery parts coverage and one-year batterylabor coverageCONSTANT POWER DISCHARGE CHARACTERISTICS: WATTS/CELL (77TF. 25°C)End point volts/cell 5 min 7.5 min 10 min 15 min 20 min 30 min 40 min 50 min 60 min 90 min1.85V 561 480 433 367 327 261 220 188 163 1161.80V 638 557 492 416 356 276 232 198 171 1221.75V 708 625 548 458 385 290 244 206 178 1261.70V 773 685 602 489 404 305 251 210 181 1271.67V 813 717 632 503 415 312 253 213 182 1281.60V 879 782 695 530 432 325 260 215 185 131All mentioned values are average values per battery per cell.Tolerance: X <6 min (+15% --15%), 6 min X <10 min 1+12%- -12%), 10 min X <60 min (+8% --8%), X60 min (+5% --5%)DIMENSIONS [H x W x D, in (mm)]13 50-0, r 3f3432.5]i-i-4)-N50K~1.L=-._ --- _ ...._12.83 i326r3-5 ATFACHMENT 3ITechnical specificationsCells per unit 6Voltage per unit 12Capacity 500W @ 15-minute rate to 1.67V per cell @771F (25°C)Weight Approximately 100.75 lb (45.7 kg)Maximum 800A (5 sec)discharge currentInternal Approximately 3.7 miresistanceOperating Discharge: 5°F-122°F (-15°C-50°C)temperature Charge: 5°F-104°F (-15°C-40°C)range Storage: 5°F-104°F (-15°C-40°C)Nominal 77°F +/- 5°F (25°C +/- 3°C)operatingtemperature rangeFloat charging 13.5 to 13,8 Vdc/unitvoltage Average at 77°F (25*C)Recommended 50Amaximumchargingcurrent limitEqualization and 14.4 to 15.0Vdc/unitcycle service Average at 77°F (25°C)Self discharge Batteries can be stored for six months at 77°F (25°C).Please charge batteries before using. For highertemperatures the time interval will be shorter. Voltagetest prior to battery installation is recommended.Terminal 12-thread lead alloy recessed terminal to acceptM6 boltContainermaterialPolypropylene UL94-VO/File E50955Flammability resistance of UL94-HB/File E216959is available upon request.3-6

.IATTACHMENT 4Excerpt from Chapter 8, NBSR 148 Electrical Power Systems8.1 Normal Electrical Power Systems8.1.1 Design BasisThese systems --i6are designed to supply all of the electrical power necessary to operate theNBSR during both normal and shutdown conditions. This includes all of the experiments,offices and other support spaces associated with the reactor. Electrical power is supplied to theNBSR by three independent, underground, 13.8 kV primary feeders (FA 1, FB 1, FC I). Eachprimary feeder is connected to a separate 13.8 kV/480V distribution transformer. The secondaryof each transformer provides power to one of three specific sections of the main 480 Vswitchgear buss (913 A, SB3 B and SB C). -A substation independent of the three feeders providespower to the equipment in the Secondary Coolant Pump Building (SCPB) and the cooling towercells equipment. Discussion efthis supply is limited to tS paragr.aph, as a secondary systemfailure .ann. t cause a r.eactor, a.cident. Other major components of the electrical distributionsystem include two independent electrical generators-(A-af"d-B), battery power, two un-interruptible power supplies (UPS), two battery chargers, transformers, and associateddistribution equipment.The electrical generators are a source of emergency AC power and are independent of the NISTelectrical distribution system. because a failure of the NIST system does not affect the reliabilityof the local generators- as a power sourced i.str.ibutin equipment and the fuel supply for- eithergcner-ato engine. Battery power is provided by the station battery, described elsewhere in thischapter. The availability of multiple emergency power sources provides flexibility for operationof the facility in normal or emergency circumstances, but reactor safety requires only oneoperable backup power supply to The redundancy crf imRP@o*Ant la-ds and the protective s.hemeofthe bre, A ke.r.s in; teEcra Distr-ibutin System- prevent consequences from a,,y singleequtipn failure exceeding those &EnFrom an accident causing a total loss of power for therieaeer--systemsanalyzed in Chapter 13. -Therefore, while equipment and power sources haveredundancy, redundancy is neither present nor necessary in the normal configuration of thefacility distribution system.As described below, the electrical distribution system consists of three major sub-systems: theFacility (or Building Services) Distribution System, the Reactor Distribution System and theEmergency Distribution System.8.1.2 System Description8.1.2.1 High Voltage Input [not applicable]4-1 8.1.2.2 Facility Distribution System [not applicable]8.1.2.3 Reactor and D-Wing Distribution System[The first three paragraphs are not applicable.]Off-site power provides AC power through the MAIN UPS to Critical Power Panel CP-1, whichin turn supplies CP-2 and CP-3. The critical power panels supply power to the Reactor Controland Safety Systems. Normally, the STANDBY UPS is running and its output is directed to themain UPS reserve input.Tables 8.4A, 8.4B and 8.4C list the loads on Critical Power Panels CP-l, CP-2 and CP-3,respectively.Off-site power also provides AC power to maintain the lead-acid battery voltage and power tothe DC loads on the 125 VDC Panel. Two battery chargers, one from MCCA-5 and one fromMCCB-6, are load sharing devices and convert commercial AC power to DC power to provide afloating, or trickle, charge to the 125 VDC battery, and separately energize the 125 VDC panel.The battery chargers are designed to work with the battery, which prevents a large temporaryvoltage drop from occurring on the 125 VDC panel if a large DC load is energized.The 125 VDC Distribution Panel supplies power to two other DC panels: MCC DC (Table 8.21)which supplies Panel DCP-2: and Panel DCP-1. Tables 8.3A, 8.3B, and 8.3C list the loads onthe 125 VDC Distribution Panel, DCP-1. and DCP-2, respectively.8.1.2.4 Emergency Distribution SystemPower- MCC A 5 is fed from ReaD t .r MCC A 3 thro.ugh irc.uit Br-eakcTN. 1. E..erg.ncy Power- MCC 13 6 is fed fr- m D -MCC B3 4, through AC3 Ne. 4.The two Emergency Power MCCs are tied together through a normally closed tie-breaker. Thecategorization of these motor control centers as emergency MCC is due to a single load, namelyEF-5 on one MCC and EF-6 on the other MCC; both fan etoefs-blowers also can be poweredfrom the DC buspanel.The normal distribution lineup has ACB#Ne-. 1 closed and ACBN#-No.4 open in stand-by. Inthis configuration, switchgear bus SB-AFA-I supplies both MCC A-5 and B-6 via Reactor MCCA-3. Since EF-5 and EF-6 are considered to be necessary for an emergency response, provisionsare made to automatically provide emergency power to the two loads. An under-voltage devicemonitors the status voltageonf MCC A-5 and through the closed tie breaker, MCC B-6. If thisdevice senses a loss of voltage, it automatically trips open ACB#N-. 1 and closes ACB# No.-4.4-2 This transfers the feed for MCC A-5 and MCC B-6 to Switchgear Bus 8--BFB-1 via ReactorMCC B-4.If power is not restored to MCC A-5 and MCC B-6, this same under-voltage device trips openACB#No-. 4 and initiates the starting sequence of the emergency generators. Once a generatorachieves the proper output frequency and voltageelectrical parameters, its associated FeederBreaker, ACB#-N4e-2 for Emergency Generator A or ACB#--No.3 for Emergency Generator B,closes to restore power to MCC A-5 and MCC B-6. The generators are discussed in Section 8.2;Emergency 'Electrical Power- Systems.MCC A 5 and MCC B 6 provide power tc all of the equipment necessary for the rector inashutdown fr secured cendition. Table 8.2E lists the loads supplied by MCC A-5 while Table8.2F lists the loads supplied by MCC B-6.Dur-ing normffal operation, either the T 9 Reactor UPS or- the T: 10 Reacter- UPS supplicsAf)EA A- YTfe F ...... A : , Rt,÷ Y. WAR H SW S ..... 1 ..... .c WW a ..Ey u Icef the toe 20 1 IPS will Uonvet -And- cndition the supplied- commercwial AC pnerrp to aythe lads of the r 125 VDC bus and provide a floating, of trihkle, mharge to the statien battery. Theether UPS is energized, but not on line and aCts as an installed spare. The Critical Power Panelssupply pofer to the Reaitn r nattryl and Safety Systems. Tables 8 poA, 8.4i and 8.46 list theloads onf Criti4c-Al Poweipr Pnl CUP 1, CP 2 and GP 3, r-espectively. The 125 VDC Distr-ibutionPanel -also supplies pewer e to two other PC panels, MCC PC (Table 8.21) whieh supplies PanelDCP 2, and Panel DCP 1. Tables 8.3A, 8.313, and 8.3C list the loads ont the 125 VDCDistr-ibution Panel, Panel DCP 1, and DCP 2 r-espectively.The sequence of power transfers involving the UPS to maintain power without interruption toCP-1. starting with a normal reactor electrical distribution configuration. is as follows:I. If AC power from MCC B-6 is lost to the input of the main UPS. then the battery bankfor the main UPS would provide AC power to CP- 1.2. After the main UPS battery bank is depleted, the standby UPS Provides AC Power toCP-lI througzh the reserve input of the main UPS. If AC power is restored to MCC B-6and the main UPS battery bank is not depleted and the main UPS has not triPped on afault, then the main UPS would retumn to service automatically.3. If AC power from MCC A-5 is lost to the standby UPS. then the battery bank for thestandby bank would provide AC power to the main UPS reserve input. If AC power isrestored to MCC A-5 and the main UPS battery bank is not depleted and the standby UPShas not tripped on a fault, then the standby UPS would return to service automatically andprovide AC power to the reserve input of the main UPS.4-3

4. After the standby UPS battery bank is depleted and after AC power is restored to MCCA-5, unfiltered AC power will be directed through the standby UPS to the reserve inputof the main UPS.if AG poer iF klest to the input of the on; lin Re UPS, batterzy power- automatically supplies theloads on the 125 VD. DiStribution.. Panel and the Citieal Pwer Panel leads. When AC p.wer isr-estored, either frmn the emer~geny generatr- Or fr6M another SOure, the UPS autmte iallyresumes char-ging the station battery, and the UPS -eautomiatic-ally r-esumnes supplying power to theCritical Power Panel and the 125 V-DC Distributicn Pmnel.lf AC power is lost to the input of bothbattery chargers, the trickle charge to the sixty cell lead acid battery bank would cease and thatbattery bank would assume the loads on the 125 VDC panel for at least 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br />. After AC poweris restored, the primary battery charger resumes charging the battery bank.Emergency Lighting Panels X-1 and X-2 supply selected lights with either AC power or DCpower. Panel X- 1 powers emergency lights in the office spaces in the A- and B-wings.Normally, this panel receives AC power from CP-3. Upon loss of AC power, automatic transferswitch TS- 1 transfers the feed from CP-3 to DCP- 1. Panel X-2 powers emergency lights in theConfinement Building. Normally, this panel receives AC power from MCC A-5 viaMiscellaneous Power Panel P-5, located on MCC A-5. Upon loss of AC power, an automatictransfer switch transfers the feed from MCC A-5 to DCP-1.A simplified diagram of the Emergency Distribution System bussing arrangement is shown inFigure 8-2.8.1.3 Electrical Power Capability [not applicable]8.1.4 Codes and Standards [not applicable]8.1.5 Lightning Protection [not applicable]8.1.6 Grounding [not applicable]8.2 Emergency Electrical Power Sources8.2.1 Design BasisEmergency electrical power is designed to provide power to the nuclear instruments and theemergency exhaust fans should a complete loss of off-site power occur. One of the twoemergency generators is capable of supplying power to all necessary emergency equipment.Battery power is also capable of independently supplying the vital loads for a minimum of fourhours. By requiring the operability of at least one emergency generator during reactor oNerationand requiring the availability of battery power during reactor operation, power sources willalways be available for an emergency response.4-4 8.2.2 System DescriptionThis system consists of:a. [not applicable]b. The station battery- is composed of three battery banks, two of which would be inservice in a loss of AC power scenario. which eombinOne bank is made up of sixty,two volt, lead-acid type baaefy eellsbattery cells to produce a single output of 125VDC with a capacity of 880 amp-hours. The other two banks comprise theemergency AC backup capability of the two UPS. One bank would be in-service, andthe other bank would be in standby. Each bank is made up of valve-regulated lead-acid (VRLA) battery cells..~ otPC bus which can supply power to" thle Vital lJoAds for emergency situations.The bus w an be energized via the PC iutput. Of either f the 20 kV. A IUPS oroutput of the staicn battery.In case of a total loss of off-site power and emergency generator AC power, vital equipmentwould remain energized for at least four hours: EF-5 and EF-6 DC powered fans, controls, andassociated valves, and nuclear instrumentation. Non-vital equipment on the critical power panelsand the DC bus would remain powered for at least four hours, unless de-energized withindividual controls, e.g. a local breaker. That equipment includes process instrumentation, ACand DC valve control power, effluent monitors, other critical power panel loads (see Chapter 7),and the reactor shim arm control. the 125 -D bus w..ouldremain enerized for l oad classifiedas rveator- emcrgeney equipment. These circeumstanees would require a DG power- sourcee andthe station batetery serveOS a;s, t-he- W sourcee to carr-y the elmerec equIp..."ment loaRds -f-r- eight.heursstai bIttr a ý ssuming the cuiten t nceds fa r all oIf the equipment would equalapproximately 100 amps, plus the amfperaige required by an operaiting 20 kVA UPS. Tiequipment includes the following:- vital equipment (Emnergency Ventilation Sy'stem DC poweredhweteF (T-9 mode or Tl 0 mode), the reaeteinstrumentation.r~~~ ~ IhDn .7n Pnrn nn rnt'r r"4-5 ITable 8.1A, B, C [not applicable] and Table 8.2A, B, C, D [not applicable]Table 8.2E: Load List MCC A-5, Emergency PowerCubicle Load1B Breaker Interface Module (BIM) & CentralMonitoring Unit (CMU)1E TVSS1 G D20 Storage Tank Pump DP-7iJ T-4OStandby UPS1 M SCV-502A Door (Future)2F Miscellaneous Power Panel A52HL Primary2HR Secondary2M 15 kVA Transformer3B Helium Blower HB-13D EF-33F EF-43HL Elev. & Door Cont. Power3HR Reactor Door Panel P8, P93K Rabbit Blower3ML Feeder Control Air Compressor No. 2,Battery Charger 23MR Spare4B D20 Experimental Booster Pump DP-94E D20 Shutdown Pump DP-54G Secondary Cooling Shutdown Pump4J Sump Pump to Hot Waste4LL DWV-24LR Spare4M Door (Future)5B Thermal Column Pump No. 15D Demin. Water Exp. Cooling Pump No. 15G Thermal Shield Circ. Pump No. 15M Feeder Reactor MCC A-36C Subfeed Lugs to MCC B-66G Relay Panel6H Door (Future)6M Feeder Emergency Generator A4-6 Table 8.2F: Load List MCC B-6, Emergency PowerCubicle Load1 E Feed From MCC A-51 H Relay Panel1 M Feeder Emergency Generator B2B D20 Experimental Booster Pump DP-102D Demin. Water Exp. Cooling Pump No. 22G Thermal Shield Circ. Pump No. 22H Door (Future)2M Feeder Reactor MCC B-43A Hot Waste Sump Pumps 1A & 1B3D D20 Shutdown Pump DP-63FL T--Main UPS, Battery Charger 13FR Spare3H Emergency Sump Pump3KL Feeder Control Air Compressor No. 13KR DWV-13ML Spare3MR Spare4B Tritium Blower4D Recirculation Supply Fan SF-194F Dilution Exhaust Fan EF-24H Hood Exhaust Fan EF-234K Spare4M D20 Storage Tank Pump DP-85C DWV-195E Helium Blower HB-25J Thermal Column Pump No. 25M TVSSTable 8.2G: Load List MCC DCCubicle LoadA-1 DC Power Panel 2 (DCP-2)B-1 Exhaust Fan EF-5 (DC Motor)C-1 Exhaust Fan EF-6 (DC Motor)D-1 Exhaust Fan EF-5 (AC Motor)E-1 Exhaust Fan EF-6 (AC Motor)A-3 D20 Shutdown Pumps DP-5B-3 D20 Shutdown Pumps DP-64-7 Table 8.3A, B, C [not applicable] and Table 8.4A, B, C, D [not applicable]Figure 8.1: Simplified Diagram -High Voltage Input Switchgear and Bussing Arrangement [notI applicable]Figure 8.2: Simplified One-Line Diagram for the Reactor and Emergency Power DistributionSystem (Normal/Preferred Lineup, Essential, and Vital Loads) [See page 2 of Attachment 1]4-8