ML19296D784
| ML19296D784 | |
| Person / Time | |
|---|---|
| Site: | Brunswick  |
| Issue date: | 11/26/1979 |
| From: | Boone J, Moore D, Wagoner L CAROLINA POWER & LIGHT CO. |
| To: | |
| Shared Package | |
| ML19296D782 | List: |
| References | |
| B-5245, NUDOCS 8003130194 | |
| Download: ML19296D784 (20) | |
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UPS DESIGN AND OPERATIO:: EVALUATION 1
REPORT TO PNSC IN RESPONSE TO NRC CONCERNS ARISING FRO:4 UNIT NO 1 SCPJJi ON NOVE!3ER 20,1979 s b PREPARED BY: e L. V. WACO:ER J. S. BOONE D. E. MOORE 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 of voltage, 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 described in the FSAR.
- 3. Assure that procedures exist to cover loss of inverter, that the operator 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 A review of the design concepts of the UPS system indicates that it is designed to maintain quality and continui*.v of 120 VAC power to critical
. monitoring and control loads. These are 'n-safety-related loads which require a source of uninterrupted power ia order to maintain sustained plant operation during normal transients. It is desirable to reliably monitor and protect this equipment due to its importance for continuous power generation. The UPS System is neither designed, nor is it ever required, 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' modules and a static transfer switch. The inverters receive normal AC power from the emergency bus and backup DC power from the station batteries. The reserve sourcc for the static switch is also the emergency bus. The normal invertcr feed in from the Division I bus, and the standby inverter is fed from D; vision II.
The alternate source to the static switch is from Division II.
The inverter i.s designed,to adequately respond to system transients as follows:
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 maintain inverter on AC feed until the rectifiers shut off on high voltage c r if a spihc damages the rectifiers. Auto switch to the DC source would occur, and inverter operation would continue. Static transfor switch 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 occur since incoming AC is fed from a motor control center breaker that opens and closes all three phases sim21taneously.
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8 II. Design Review (Cont'd)
D. Loss of DC to Inverter No response unicss AC feed is lost, as inverter normally runs off of AC. If incoming AC is also lost, static transfer switch switches to alternate feed.
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 will stay on the alternate feed until the inverter output voltage returns to the normal range. -
G. Inverter Output Fuse Blown Static transfer switch transfers to alternate source, as undervoltage is 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 bus directly to either the inverter or the alternate feed via the bypass suitch. -
The inverter will operate on battery DC inp 2t until it shuts off on low DC voltage at 205 volts. Transfer switch v>uld then transfer to the alternate sourcc.
Transfer to the alternate source occurs irregardless of the status of tt.e alternate source (i.e., energized or dead). The transfer switch will stay on the alternate feed until the inverter output returns to normal range. Thus, if UPS were being fed from the alternate feed and that E bus 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 capacity of 37.5 KVA. Phase A on b6d1 Unit Nos.1 and 2 inverters is more heavily loaded than Phases B and'f]ut in reviewih!;'this with the inverter manufacturer, no prob 1 cms should be encountered. Future load addition cr*
changes will b2 evaluated to more nearly ba_ance the phase loadings. Ne loading changes have occurred that induce starting surges or running loads 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 and static transfer switch arc installed per design and manufacturer's recommendations and that it will operate as designed in this configura-tion. Review of the purchase specification and techh.ical manual revealed no inconsistencies in design, installation, or operation parameters between these documents. Transient tests will be conducted on the inverters and static transfer switch feeding their normal house loads.
References A. UE6C Design Engineers B. Static Products Inverter Technical Manual C. SD-52, 120 VAC Electrical System D. FSAR E. Purchase Specification 9527-01-106-1 F. Preoperational Test Procedure 79 -
Ill. Failure Analysis UPS supplies a source of continuous power to vital loads whose loss would Icad to a loss of equipment essential for rustained plant operation, protection monitoring systems for major eqt.ipment, and plant status monitoring equipment. None of these loads are safety-related, so the failure 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 the impact of its loss. This impact was th.cn (valuated to determine the affect 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 would continue to supply power during cperation. If the PMG fails to maintain power, EHC would be lost resulting in a turbine trip.
Safety Analysis - Turbine trip is an analyzed abnormal operating transient. , , , ,, ,
',s A2. load - Feedwater Centrol Imppet of Loss ,sLoss of power tc the Feedwater Control System .
causes the reactor feed pump speed controls to lock up causing the pumps to run at a constant speed. Eventually either a hi;h level would occur, Icading to a reactor feed pus.p trip, turbine trip, and reactor scram or a low level leading to a reactor scram.
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III. Failure Analysis (Cont'd)
A2. Load - Feedwater Control (Cont'd)
Safety Analysis - The excess feedwater flow transient is bound by 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 i
Impact of Loss - The loss of UPS would cause a loss of excitation and 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 closure are analyzed abnormal operating transients. ,
A4. Loao - Steam Jet Air Eiector Locic Imptct of Loss - The loss of UPS immediately trips the steam jet air ejectors and fails the olf-gas timer. Without the air ejectors, condenser vacuum is gradually lost and a turbine trip and 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-ol Syst em removes the ability to maaually move control rods and causes a loss of the rod position display panel.
Safety Analysis - The inability to move control rods does not affect plant safety since the operation of RPS is not impaired.
Loso of control rod position display does not affect safety since the rods cannot be moved manually.
A6. Loac' - Rod Worth Minimi:cr (RWM)
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Impt.ct of Loss 'A'n RWM rod block occurs as a result of loss of power. , j ' '- - ..
<s Saftty Analysis - A rod block is created so the rods cannot be moved. Since the RWM is only needed when rods are being moved, its loss does not impact safety.
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III. Failure Analysis (Cont'd)
A7. Load - Automatic Dispatch System Impact of Toss - A loss of power causes the Automatic Dispatch System to lock up, resulting in a constant recirculation system flow. Since flow remains the same, the power also stays constant.
Safety Analysis - Since no change in power or flow occurs, the reactor continues to operate in a stable mode and safe reactor operation is assured. Even if a change in recirculation flow occurs, recirculation flow control failure with either increasing or 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 vibration protective 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 the operation 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 its capabilities of perforcing core chcrmal calculations, alarming and logging operational status and events, and operation of the RWM are lost. An RWM rod block is generated.
Safety Analysis - Loss of the process computer does not affect the ability to continue to operate the plant or any safety system. The core thermal calculations can be done by hand and the data logging is not essential. Although the RWM is lost, a rod block is created, preventing manual rod movement. Sincc the RWM is only needed to function when moving control rods and no other safety system is affected, loss of the process computer does npf 'af fect any safe ty analysis.
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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 loss results in a downscale indication and loss of one of three Hi level trip logic channels. The narrow range leve.1 recorder may fail 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 seven other independent level indications, two of which cover the exact saec range. The turbine trip logic is two of three on high level, so the minimum number of channels are still oper-abic. The other channels are powered from inverters off of the plant battery systems. -
2 C3. Load - Balance of Plant Instrumentatica Impact of Loss - The loss of power would cause a loss of indication of the flow, level, pressure, etc., of numerous balance 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 only indication and perform no alarm, control, switching, or trip-ping functions.
Safety Analysis - The indications on these systems are.an aid to their operation and are not essential. Their loss does not affect 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 an accident. Further, BOP status can be determined from local indications, although BOP proces s control would be more dif fi: ult.
IV. Summarv A review of the loads supplied by the UPS System confirms that it does not feed any equipment necessary for the cperation of any safety-related systems or equipment required for remote shutdown. An evaluation of the effect 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, reactor low level, reactor high level, and reactor high pressure. Even though systems associated with the manual movement of the control rods are affected, rod blocks are created which prevent movement. There is no impact on the RPS scram logic, so the plant can be shut down. With the progressive loss of condenser vacuum and the feedwater control lockup, it is doubtful tnat the reattoE"'would continub to operate for more than a fewminutesbeforeanagtohhticscramoccurs. The possible transients which could result from the loss of UPS are bound by those analyzed in the FSAR.
Since the loss of UPS does not change any previous safety analysis in that it does not affect any safety system and its operation is not needed, since the resulting transients are bound by the previous safety analysis in the FSAR and do not create an unreviewed safety question, since UPS does not decrease the margin of safety because it does not fl
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IV. Summary (Cont'd) affect any safety systems, and since there are no Technical Specifications associated with the operation of UPS, its failure does not affect the overall safe response of the plant to any operating transients and the current 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 appropriate corrective actions.
An caergency instruction has been developed for complete loss of the UPS System. It includes expected symptoms, automatic actions, and instructions for recovery from the UPS System loss. .
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