ML20039F896
| ML20039F896 | |
| Person / Time | |
|---|---|
| Site: | La Crosse File:Dairyland Power Cooperative icon.png |
| Issue date: | 12/09/1981 |
| From: | Crutchfield D Office of Nuclear Reactor Regulation |
| To: | Linder F DAIRYLAND POWER COOPERATIVE |
| References | |
| LSO5-81-12-030, LSO5-81-12-30, NUDOCS 8201140035 | |
| Download: ML20039F896 (2) | |
Text
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Docket NRC PDR Local PDR December 9,1981 ORB Reading NSIC DCrutchfield Docket No. 50-409 HSmith LS05-81-12-030 RCaruso OELD OI&E (3)
ACRS (10)
Mr. Frank Linder SEPB General Manager Dairyland Power Cooperative 2615 East Avenue South La Crosse, Wisconsin 54601
Dear Mr. Linder:
SUBJECT:
ADEQUACY OF STATION ELECTRIC DISTRIBUTION SYSTEM VOLTAGES -
LA CROSSE BOILING WATER REACTOR On November 5,1981 we forwarded to you our Safety Evaluation and our consultant's technical evaluation on this subject. We have discovered that pages 2, 4 and 6 of the technical evaluation were inadvertently omitted, and we hereby enclose those pages. We are sorry for any inconvenience this may have caused you.
Sincerely.
Original signed by Thomas V. Wambach for/
Dennis M. Crutchfield, Chief Operating Reactors Branch #5 Division of Licensing
Enclosure:
Pages 2, 4 and 6 cc w/ enclosures:
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Mr. Frank Linder' December 9,1981 cc Fritz Schubert, Esquire U. S. Environmental Protection' - ~
Staff Attorney Agency Dairyland Power Cooperative Federal Activities Branch I
2615 East Avenue South Region V Cffice l
La Crosse, Wisconsin 54601 ATTN: Regional Radiation Representative i
230 South Dearborn Street O. S. Heistand, Jr., Esquire Chicago, Illinois 60604 Morgan, Lewis & Bockius 1800 M Street, N. W.
Mr. John H. Buck Washington, D. C.
20036 Atomic Safety and Licensing Appeal Board U. S. Nuclear Regulatory Comission Mr. R. E. Shimshak Washington, D. C.
20555 La Crosse Boiling Water Reactor s
Dairyland Power Cooperative Dr. Lawrence R. Quarles P. O. Box 135
. Kendal at Longwood, Apt. 51 Genoa, Wisconsin.-54632 ~ -
Kenneth-Square, Pennsylvania-19348 -
Ms. Anne K. Morse Charles Bechhoefer, Csq., ~ Chairman Coulee Region Energy Coalition Atomic Safety and Licensing Board P. O. Box 1583 U. S. Nuclear Regulatory Comission La Crosse, Wisconsin 54601 Washington, D. C.
20555 La Crosse Public Library Dr. George C. Anderson 800 Main Street Department of Oceanography La Crosse, Wisconsin 54601 University of Washington Seattle, Washington 98195 U. S. Nuclear Regulatory Comission Resident Inspectors Office Mr. Ralph S. Decker Rural Route #1, Box 276 Route 4, Box 190D Genoa, Wisconsin 54632 Cambridge, Maryland. 21613 Town Chairman Thomas S. Moore -
Town of Genoa Atomic Safety and Licensing Appeal Board Route 1 U. S. Nuclear Regulatory Comission Genoa, Wisconsin 54632 Washington, D. C.
20555 Chairman, Public Service Comission of Wisconsin Hill Farms State Office Building Madison, Wisconsin 53702 Alan S. Rosenthal, Esq., Chairman Atomic Safety and Licensing Appeal Board U. S. Nuclear Regulatory Comission Washington, D. C.
20555 Mr. Frederick Milton Olsen, III
==.
609 North lith Street Lacrosse, Wisconsin 54601 l
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6.
ANSI C84.1-1977, " Voltage Ratings for Electric Power Systems ana Equipment (60 Hz)."
jixreviewpositionshavebeenestaDlishedfromtheNRCanalysisguide-lines and tne aoove-listed documents.
These positions are stated in Section 5.0.
3.0 SYSTEM DESCRIPTION Figure 1 of this report is a simplified s diagramtakenfromtheSargent&Lundyreport.jetchoftheunitone'-line It shows that 480V class IE buses lA and 18 are supplied power by 480V auxiliary ouses lA and la, respectively, wnicn, in turn, are powered by 2400V buses lA and IB oy separate transformers.
There is only one reserve auxiliary transformer to supply offsite power for all buses. The unit auxiliary transformer cannot be used as a reserve source. There is automatic transfer from the unit auxiliary trans-former to the reserve auxiliary transformer in the event of a unit trip.
Undervoltage relaying is provided on class lE buses lA and 183 to-separate tne bus from offsite power should the voltage De degraded or lost.
DPC supplied the equipment operating ranges identified'in Taole 'l.3 4.0 ANALYSIS DESCRIPTION 4.1 Jesign Cnanges. The voltages shown on Table l-are cased on tne following enange.
The tap setting of the reserve auxiliary transformer uili ce enanceo to tne 70725V tap "as soon as operational conoitions
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cermit."2 4.2 Analysis Conditions., DPC nas determined by previou's steady state-voltage measurements tnat tne maximum expected offsite grid voltage is 73.2KV ano the minimum is 70.8kV.
DPC nas analyzed tne offsite source to the onsite oistrioution system unoer extremes of load.and offsite voltage conditions to determine tne terminal voitages at tne class lE equipment. The worst case class lE eauipment terminal voltages occur under the following conditions:
1.
Tne worst loading condition occurs when all loads tnat coerate for oower operation and the class lE LOCA loads are carried oy tne reserve auxiliary transformer.
2.
The worst transient voltage occurs on the class lE system under the aoove condition combined with starting a 1500 hp feedwater pump on a 2400V bus.
3.
The hignest steady state voltage was determined to occur if no loads were operating.
2
TABLE 1 CLASS lE EQUIPMENT VOLTAGE RATINGS AND
- ANALYZED WORST CASE TERMINAL V0LTAGES
(% of nominal voltage)
Maximum Minimum Analyzeda Equipment Condition Rated Analyzed Rated Steaoy State Transient 440V Motors Start 80 79.8 Operate 110 107.5 90,
92.3 460V Startersb Pickup 73.9 76.3 Dropout 60.9 76.3 Operate 110 102.8 87.0 89.4 480V Battery Chargerc 110 98.5 90-E4.6 r-440V Battery Chargerd 110 107.5 90 92.'3 Other Equipment 120Ve l
L The analysis verification performeo ey OPC snews tnat the measured a.
voltage is up to 1.1% lower tnan tne corresponding analysis-derived voltage gsee Section 4.4).
The values here do not allow for tnis difference.
a.
Ratings per telecon5 and test.6 Diesel Plant Battery Charger, ratings per telecon.5 c.
Reactor Plant and Generator Plant Battery Chargers, ratings per c.
telecon.3 inis equipment is normally supplied oy DC-powered inverters or alter-e.
-nate source regulating transformers (110% to ~80%).4 The analyses provided did not account for use of tne ous inter-ties between auxiliary 480V bus lA and 1B or between class 1E 480V bus lA or 18.
4.3 Analysis Result. Table i shows the projected worst case class lE equipment ~ terminal voltages identified from the DPC analysis.
It snows tnat, witn the exception of the 480V battery enarger, all class IE loads
' ---are capable of starting and continuously operating for all conditions.
4:-
The worst analyzed steady state voltages are low oy '5.4% for the
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diesel plant oattery cnarger.
This enarger shuts down when the input l
l 4
Pos'ition 4--The NRC letterI requires that test results verify the accuracy of tne voltage analyses supplied.
DPC nas'shown tnat tne calculatibns represent the class lE buses and loads acequately.
Position 5--No event or condition snould result in the simultaneous or consequential loss of cotn required ' circuits from tne offsite power network to the onsite distriDution system (GDC 17).
OPC has not analyzed tne La Crosse co3nettions 1p tne nffs.ite power grid.
However, the DPC submittaTs M nly one reserve auxiliary trans-furmer with no other availaole connection to tne offsite gria.
Tnis does not meet the GDC 17 requirement tnat two pnysically-indepenoent cir,cuits ce available or tnat no potential exists for similtaneous or consequential loss of Doth circuits.
Position 6--As required by GDC 5, each offs.ite source snared netween units in a multi-unit station must be capable of supplying adequate starting and operating voltage for all required class lE loads with an accident in'~
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one unit and an c7derly's~hutdow'n and ~c'boldown in the remaining units.
This applies to multi-unit plants.
It does not apply to the La Crosse single-unit station.
6.0 CONCLUSION
S The voltage analyses submitted by DPC for the La Crosse Boilirg Water" Reactor were evaluated in Section 5.0 of Inis report. With the completion of tne enange descrioed in Section 4.1:
'/oltages uitnin tne operating limits of tne class IE equipment are supplieo for all projectec como1 nations of plant load and offsite power gric conditions.
2.
The test used to verify tne analysis snows tne analyses to ae an accurate representation of tne worst case
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conaitions analyzed.
3.
EG&G Idano, Inc., is performing a separate review of the uncervoitage relay protection at tne ca Crosse station.
Tnis will evaluate the relay setpoints anc
- time ceiays to determine tnat spurious tripping of tne class
'.E ouses will not occur with normal offsite source voltages.
4.
The La Crosse station, built before GDC 17 was approved, does not have a second source of offsite power. This will be considerec in the NRC Systematic Evaluation Program integrated assessment of tne La Crosse Station.
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