ML20132A807
| ML20132A807 | |
| Person / Time | |
|---|---|
| Site: | North Anna  |
| Issue date: | 08/16/1979 |
| From: | Stallings C VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.) |
| To: | Harold Denton Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 7908210410 | |
| Download: ML20132A807 (23) | |
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i Vrnorn:A ELucrRIC AND POWEH CO M PA NY l
Ricuwonn,vinorwsA 2Ou61 1
August 16, 1979 Mr. Harold R. Denton, Director Serial No. 352A Office of Nuclear Reactor Regulation P0/FHT:sej Attn:
Mr. D. B. Vassallo, Assistant Director Docket No. 50-338 for Light Water Reactors License No. NPF-4
. Division of Project Management U. S. Nucleat Regulatory Commission Washington, D. C.
20555
Dear Mr. Denton:
North Anna Unit No. 1 Station Electrical Distribution System Voltages In our previous letter on this subject, Serial No. 352/050279, dated July 5, 1979, we stated that analyses to verify the capability and capacity of the electric power system, as modified, to start and operate the required safety loads within their rated voltages were in progress and that results would be available on or about July 31, 1979. We herewith forward the results of those analyses.
The worst case reserve system loading that was considered in the design of the modification to the station electric power distribution system was one unit in the start-up mode on reserve power and the other unit at 100% power on station service power. The operating unit then trips and transfers to the reserve power systeta.
/ Using the above condition as the plant operating requirement we then used the following Emergency Bus requirements as a design basis. The Emergency Buses should not be inadvertently transferred from the preferred source (RSST) to the standby source (Emergency Diesels) on a transfer of the running unit to the reserve transformers. 'Iherefore, the voltage on the emergency buses must remain above 90% indefinitely or it must recover to greater than 90% in 60 seconds or, in the case of a safety injection actuation, within 10 seconds.
Certain pre-conditions will be required to assure that the worst-case loading used in the voltage studies is not exceeded.
These cenditions also assure that one feedwater pump and cne condensate pump will be running in each unit af ter automatic load shedding has occurred.
These conditions are as follows:
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Vinosus4 ELECTRIC AND POWER COMPANY TO Mr. Harold R. Denton 2
~
1.
Anytime a unit is in a start-up mode when the other unit is on the line, a selector switch on the transformer protection panels for the start-up unit must be placed in the " Start-Up" position.
l 2.
Tite unit that is on the line will be using two of three steam generator feed pumps; the start-up unit will use only one feedwater pump (this complies with the system design).
It will be required that the start-up unit use the feedwater pump with : letter designation (which indicates the bus that it is fed from) which is different from the two operating on the other unit. For example, if the unit on the line has its "A" and "C" feedwater pumps operating, the start-up unit must use its "B" feed-water pump.
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3.
The start-up unit must use the condensate pump which is fed from the same bus as its running feedwater pump.
For instance, if "B" feedwater pump is used for start-up, the "B" condensate pump must also be used.
4.
The unit that is on the line may be running all three condensate pumps or must be running the two condensate pumps that are fed from the same l
buses that are feeding the two running feedwater pumps.
With these pre-conditions in effect, automatic load shedding will occur upon the trip of the unit on the line and subsequent fast transfer of the loads from the normal station service to the reserve station service.
This load shedding will trip of f all high and low prescure heater drain pumps, two of three condensate pumps, and one of two feedwater pumps in the unit that was transferred to the reserve source.
Other data and assumptions that have been used in this study are as follows:
A.
Minimum voltage on 500kv bus is 508kv based on studies which have previously been transmitted.
B.
The reserve transformer load tap changer will correct voltages to the maximum extent possible.
For motor starting conditions (accident cases) the LTC position before the incident was determined based on reasonably expected pre-conditions, the was assumed to remain in this position while the emergency motors are started.
C.
Containment depressurization actuation results in tripping of all feedwater and condensate pumps on that unit.
D.
No operator action to reduce load is assumed to occur for 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> af ter a unit trip.
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VauoluA Ex.ECTHIC AND Powra COMPANY TO Mr. Harold R. Denton 3
E.
Degraded voltage relay protection on the 4160 volt emergency buses has l
been considered and will not separate tia emergency buses from the pre-l ferred source for the conditions analyzed.
The enclosed data show the results of our studies. These data clearly illu-strate that for the worst case conditions examined, as defined earlier, the system will have acceptable voltage levels, both for emergency motor start-ing and continuous operation of all equipment.
Following is a brief descrip-tion of all enclosures:
Enclosure A: Three graphic results of studies conducted to examine the worst case loading configurations which can occur for the two unit station under the non-accident conditions defined earlier. The loads indicated are those which will remain af ter load shedding. The three different conditions repre-sent the variations in loading that will occur dependent upor which feedwater pump the start-up unit uses. These results indicate that the voltages avail-able on the 4160 volt and 480 volt emergency buses are adequate to operate all the loads continuously.
Enclosure B: Two graphic results of studies conducted to examine the two worst case loading configurations which could occur for containment depressuri-zation actuation accident conditions. These cases are for accident conditions on one unit with subsequent fast transfer of loads, while the other unit is in its start-up mode, and for accident conditions for a unit while in startup mode, and for accident conditions for a unit while in start-up with other unit tripped from 100% power with subsequent fast transfer of loads. These results show that adequate voltages are available to start and continuously run all required emergency loads.
It should be noted that the large emergency motors reach full speed within four seconds, by which time the voltage will have recovered to above 90% of the bus voltage rating.
Enclosure C: The enclosed one-line diagrams show the revised electrical power distribution system.
Enclosure D: The enclosed logic diagrams show the annunciation and control sequence for the load shedding scheme, the reserve station service load moni-toring, and the revised relaying necessitated by the revisions to the distri-bution system.
Enclosure E: The enclosed letter from General Electric Company to our Mr. John M. Davis dated June 8,1979 documents that our reserve station service trans-former can carry 156% of maximum nameplate rating for one hour without signifi-cant loss of life.
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Vssolw!A ELzcTaic Axo Powra CowvAxv To Mr. Harold R. Lenton 4
We are continuing with other studies to further upgrade the offsite power supplies to unit auxiliary loads such that load shedding and administrative controls of equipment usage will not be required. These studies include consideration of the addition of Units 3 and 4 at this site.
In addition, we have determined the worst case voltage drops in the leads to emergency motors for cases BA and AW.
(See enclosure 2).
These worst case voltage drops are as follows:
A.
30.4 volts for the Unit 1480 volt quench spray pumps for case BA.
B.
27.78 volts for the Unit 14160 volt service water pump for case BA.
We intend to perform tests to demonstrate the validity of the analysis results. A description of the test program will be forwarded as soon as it is available.
Very truly yours,
/d Uen W C. M. Stallings Vice President-Power Supply and Production Operations cc:
Mr. James P. O'Reilly L
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s LECTRIC UTILITY SALES DIVISION GENERAL ELECTRIC COMPANY, P.
- o. B o X 0974 RICHMOND, VIRGINIA 23230 Phone (804) 283-4071 June 8, 1979
Subject:
Vepco P.O.
- 49766 G.E.
Regn. 326-88100 Reserve Station Service Transformers - North Anna Power Plant Mr. John M. Davis Virginia Electric & Power Compan:
Post Office Box 26666 Richmond, VA 23261
Dear Mr. Davis:
Our Medidm Transformer factory in Rome, Georgia, has analyzed the above referenced transformers to determine the overload capability of the windings and ancillary components.
Specifically, we assumed the transformer had been operating at 75% of maximum rated load for 8 - 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> prior to overload, in a 40 C ambient.
de then assumed an emergency occurred and the transformer was loaded to 177% of its maximum nameplate rating for one hour.
Under this condition, the top oil reached a temperature of g
110.5 C, and the winding hot spot temperature was 139.6 C.
The copper lead from the winding to the bushing reached a temper-ature of 209.8 C.
Based on these temperatures, our computer program predicts a.03%
loss of life for the winding and a 10% loss of life for the lead.
If the overload were limited to 156% of maximum nameplate rating 0
for one hour (52.4 MVA), the top oil temperature would reach 100.8 C, the winding hot spot would be 126.2 C, and the lead from the windin'g to bushing would reach 180 C.
These reduced temperatures would cause an insignificant loss of life for the winding and ancillary components.
ww r
-,---w-r am ""
(e__
e GENER AL'h ELE I f, Mr.. John M. Davis Page 2 June 8, 1979 Please let me know if further information is needed.
1 Sincerel,
1 a
Edmund N.
Summers Transmission Equipment Sales Engineer i
/ljl cc:
JC Shaw MTPD, Rome 1
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