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UPS DESIGN AND OPERATIO:: EVALUATION

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REPORT TO PNSC IN RESPONSE TONRC CONCERNS ARISING FRO:4 UNIT NO 1

SCPJJi ON NOVE!3ER 20,1979,

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J. S. BOONED. E. MOORE-

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NOVD3ER 26,1979

FILE NO. B5245

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1. Design analysis of UPS inverters:

n. Review inverter response to low voltage, high voltage, loss ofvoltage, and loss of singic phases.

b. Review loads on inverter to verify sizing of unit.,

c. Is inverter installed properly to operate as designed?

d. Review Technical nanuar and design concept to see if co$patibic.

2. Determine effect of inverter failure on anticipated events describedin the FSAR.

3. Assure that procedures exist to cover loss of inverter, that theoperator can recognize it, and that it contains adequate response -

for operator to recover from loss of LTS failure.,

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UPS DESIGN AND OPERATION EVALUATION

I. Design Basis.

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A review of the design concepts of the UPS system indicates that it isdesigned to maintain quality and continui*.v of 120 VAC power to criticalmonitoring and control loads. These are 'n-safety-related loads which.require a source of uninterrupted power ia order to maintain sustainedplant operation during normal transients. It is desirable to reliablymonitor and protect this equipment due to its importance for continuouspower generation. The UPS System is neither designed, nor is it everrequired, for safe shutdown of the reactor or for actuation, monitoring,or operation of any of the ECCS systems.

II. Design ?.eview'

The UPS power conversion system consists basically of two inverter' modulesand a static transfer switch. The inverters receive normal AC power fromthe emergency bus and backup DC power from the station batteries. Thereserve sourcc for the static switch is also the emergency bus. Thenormal invertcr feed in from the Division I bus, and the standby inverteris fed from D; vision II. The alternate source to the static switch isfrom Division II.

The inverter i.s designed,to adequately respond to system transients asfollows:

A. Loss of.\C Fced to Inverter -.

Inverter automatically switches to DC so'urce and continues operatian.Static transfer switch would not function. If the AC returns, in-verter operation will revert to the rectifier output.

B. High Incomine AC Voltace

Internal rectifier circuitry would continue to operate and maintaininverter on AC feed until the rectifiers shut off on high voltage c rif a spihc damages the rectifiers. Auto switch to the DC sourcewould occur, and inverter operation would continue. Static transforswitch would not f un,etion. . . .

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C. Loss of a Sincle Phase"pf Incomine AC..., /s

Same response as total loss of incoming AC. Not likely to occursince incoming AC is fed from a motor control center breaker thatopens and closes all three phases sim21taneously.

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II. Design Review (Cont'd)- '

D. Loss of DC to Inverter,

No response unicss AC feed is lost, as inverter normally runs off ofAC. If incoming AC is also lost, static transfer switch switches toalternate feed.

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E. Loss of Alternate Feed to Static Transfer Switch#No response, as bus is normally fed from the inverter. Static

transfer switch does not function.

F. Inverter Output Overvoltare or Undervoltace

At 132 VAC or 108 VAC, static switch transfers to the reserve bus.On low or high inverter output voltage, the transfer suitch willstay on the alternate feed until the inverter output voltage returnsto the normal range. -

G. Inverter Output Fuse Blown

Static transfer switch transfers to alternate source, as undervoltageis sensed from all three phases of the inverter output.

H. Loss of Static Switch

UPS bus would'bc lost. It can be restored manually by tying the busdirectly to either the inverter or the alternate feed via thebypass suitch. -

The inverter will operate on battery DC inp 2t until it shuts off on lowDC voltage at 205 volts. Transfer switch v>uld then transfer to thealternate sourcc.

Transfer to the alternate source occurs irregardless of the status of tt.ealternate source (i.e., energized or dead). The transfer switch willstay on the alternate feed until the inverter output returns to normalrange. Thus, if UPS were being fed from the alternate feed and that Ebus is lost, 1PS will be lost until the D/G ties onto the E bus.

Analysis of tt.e UPS loads, both by print review and actual measurcecnt,indicates that the loads pfe'-6nly about 70% of power converter capacityof 37.5 KVA. Phase A on b6d1 Unit Nos.1 and 2 inverters is more heavilyloaded than Phases B and'f]ut in reviewih!;'this with the invertermanufacturer, no prob 1 cms should be encountered. Future load addition cr*changes will b2 evaluated to more nearly ba_ance the phase loadings. Neloading changes have occurred that induce starting surges or runningloads beyond original design'or inverter capacity..

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II. Design Review (C :.t'd)*

Review of the installation verified that the power convers' ion units andstatic transfer switch arc installed per design and manufacturer'srecommendations and that it will operate as designed in this configura-tion. Review of the purchase specification and techh.ical manual revealedno inconsistencies in design, installation, or operation parametersbetween these documents. Transient tests will be conducted on the

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inverters and static transfer switch feeding their normal house loads..

References

A. UE6C Design EngineersB. Static Products Inverter Technical ManualC. SD-52, 120 VAC Electrical SystemD. FSARE. Purchase Specification 9527-01-106-1F. Preoperational Test Procedure 79 -

Ill. Failure Analysis

UPS supplies a source of continuous power to vital loads whose loss wouldIcad to a loss of equipment essential for rustained plant operation,protection monitoring systems for major eqt.ipment, and plant statusmonitoring equipment. None of these loads are safety-related, so thefailure of UPS would not affect any ECCS, safe shutdown, remote shutdo,n,or other safety-related systems.

A review of the loads supplied by UP.S was performed to identify theimpact of its loss. This impact was th.cn (valuated to determine theaffect on the. plant safety analysis. The tesults are as follows:A. Equipmer.t Vital For Continued Operatio n

Al. Load - EHC

Imunct of Loss - The EHC System 1.as a backup power supply fro:a permaneit magnet generator (PMC) on the turbine which wouldcontinue to supply power during cperation. If the PMG fails tomaintain power, EHC would be lost resulting in a turbine trip.

Safety Analysis - Turbine trip is an analyzed abnormal operatingtransient.

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A2. load - Feedwater Centrol,

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Imppet of Loss ,sLoss of power tc the Feedwater Control System .

causes the reactor feed pump speed controls to lock up causingthe pumps to run at a constant speed. Eventually either a hi;hlevel would occur, Icading to a reactor feed pus.p trip, turbine.

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trip, and reactor scram or a low level leading to a reactorscram.

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III. Failure Analysis (Cont'd)

A2. Load - Feedwater Control (Cont'd)

Safety Analysis - The excess feedwater flow transient is boundby the feedwater controller failure transient and the insuf--

ficient feedwater flow by the loss of feedwater transient which-

are both analy cd.

A3. Load - Circulatine Water Intake Pumps Excitation-

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Impact of Loss - The loss of UPS would cause a loss of excitationand tripping of two of the four circulating water intake pumps.The reduced cooling water flow to the condensers would cause a*partial loss of vacuum. If the loss is severe enough, a turbine.trip and possibly an MSIV closure occur.

Safety Analvsis - Both the turbine trip and the MSIV closureare analyzed abnormal operating transients.

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A4. Loao - Steam Jet Air Eiector Locic

Imptct of Loss - The loss of UPS immediately trips the steamjet air ejectors and fails the olf-gas timer. Without the airejectors, condenser vacuum is gradually lost and a turbine tripand later an MSIV closure occur.

Safety Analysis - Both the. turbine trip and the MSIV closure- are analy:cd abnormal operating transients.

AS. Load - Reactor Fbnual Control (RMCh

Imm et of Loss - The loss of powar to the Reactor Manual Cont-olSyst em removes the ability to maaually move control rods andcauses a loss of the rod position display panel.

Safety Analysis - The inability to move control rods does notaffect plant safety since the operation of RPS is not impaired.Loso of control rod position display does not affect safetysince the rods cannot be moved manually.

A6. Loac' - Rod Worth Minimi:cr (RWM);'-s . . .

Impt.ct of Loss 'A'n RWM rod block occurs as a result of loss ofpower. , j ' '- - ..

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III. Failure Analysis (Cont'd)

A7. Load - Automatic Dispatch System,

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Impact of Toss - A loss of power causes the Automatic DispatchSystem to lock up, resulting in a constant recirculation systemflow. Since flow remains the same, the power also stays constant.

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Safety Analysis - Since no change in power or flow occurs, thereactor continues to operate in a stable mode and safe reactoroperation is assured. Even if a change in recirculation flow

occurs, recirculation flow control failure with either increasingor decreasing flow are analyzed operating transients.

B. Protection Monitoring of !bjor 1:cuipnent

Bl. Load - Turbine Sunervisorv Instrumentat ion (TSI) ,

Impact of Loss - The TSI System will no longer provide vibrationprotective trips for the main turbine or indication of its ex-pansion and movements. While damage may occur to the turbine,the other turbine trips continue to function.

Sa,fety Analysis - Danage to the turbine does not impact theoperation of any safety system and is an analyzed transient.

C. Plant S.:atus Monitorine Eouinment.

C1. Lgad - Process Cornuter.

Impact of Loss - The process computer shuts down and itscapabilities of perforcing core chcrmal calculations, alarmingand logging operational status and events, and operation ofthe RWM are lost. An RWM rod block is generated.

Safety Analysis - Loss of the process computer does not affectthe ability to continue to operate the plant or any safetysystem. The core thermal calculations can be done by hand andthe data logging is not essential. Although the RWM is lost,a rod block is created, preventing manual rod movement. Sinccthe RWM is only needed to function when moving control rodsand no other safety system is affected, loss of the processcomputer does npf 'af fect any safe ty analysis.

C2. Lord - Reactor Lejcl Indication -(One of Eight)

Impact of Loss - Only one of the eight reactor Icvel indicators,.Hi Level Turbine Trip Channel A, is powered by UPS. Its lossresults in a downscale indication and loss of one of three Hi

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level trip logic channels. The narrow range leve.1 recorder mayfail downscale, giving a reactor low level alarm.

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111. Failure Analysis (Cont'd)

Safety Analysis - There is no impact on safety, as this instru-ment does not affect any safety systems and there are sevenother independent level indications, two of which cover theexact saec range. The turbine trip logic is two of three onhigh level, so the minimum number of channels are still oper--

abic. The other channels are powered from inverters off of theplant battery systems. -

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C3. Load - Balance of Plant Instrumentatica

Impact of Loss - The loss of power would cause a loss ofindication of the flow, level, pressure, etc., of numerousbalance of plant systems such as main steam, feedwater, con-densate, service water, service air, RECCW, TBCCW, condenser,MSR, and megawatt meters. These instrument loops provide onlyindication and perform no alarm, control, switching, or trip-ping functions.

Safety Analysis - The indications on these systems are.an aidto their operation and are not essential. Their loss does notaffect any control logic or the annunciation of system problems.In addition, these indications tre not needed for the safe shut-

down of the plant or to operate any safety system during anaccident. Further, BOP status can be determined from localindications, although BOP proces s control would be more dif fi: ult.

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IV. Summarv.

A review of the loads supplied by the UPS System confirms that it doesnot feed any equipment necessary for the cperation of any safety-relatedsystems or equipment required for remote shutdown. An evaluation of theeffect of the loss of UPS indicates that eventually, if not immediately,a reactor scram with possibly a turbine trip or MSlV closure will resuJt.The potential sources of these trips are e.ondenser low vacuum, reactorlow level, reactor high level, and reactor high pressure. Even thoughsystems associated with the manual movement of the control rods areaffected, rod blocks are created which prevent movement. There is noimpact on the RPS scram logic, so the plant can be shut down. With theprogressive loss of condenser vacuum and the feedwater control lockup, itis doubtful tnat the reattoE"'would continub to operate for more than afewminutesbeforeanagtohhticscramoccurs. The possible transientswhich could result from the loss of UPS are bound by those analyzed in

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the FSAR.

Since the loss of UPS does not change any previous safety analysis inthat it does not affect any safety system and its operation is not

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needed, since the resulting transients are bound by the previous safetyanalysis in the FSAR and do not create an unreviewed safety question,since UPS does not decrease the margin of safety because it does not

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IV. Summary (Cont'd)

affect any safety systems, and since there are no Technical Specificationsassociated with the operation of UPS, its failure does not affect theoverall safe response of the plant to any operating transients and thecurrent design and reliability of the system are acceptable.

Loss of the primary or secondary inverter, or transfer of the static-switch to the alternate feed, is annunciated in the Control Room.Annunciator procedurce crist to instruct the operator on appropriatecorrective actions.

An caergency instruction has been developed for complete loss of the UPSSystem. It includes expected symptoms, automatic actions, and instructionsfor recovery from the UPS System loss.

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