ML18046A960
| ML18046A960 | |
| Person / Time | |
|---|---|
| Site: | Palisades  |
| Issue date: | 10/12/1981 |
| From: | Bordine T CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.) |
| To: | Crutchfield D Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 8110190568 | |
| Download: ML18046A960 (32) | |
Text
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Power company General Offices: 212 West Michigan Avenue, Jackson, Ml 49201 * (517) 788-0550 October 12, 1981 Director, Nuclear Reactor Regulation Att Mr Dennis M Crutchfield, Chief Operating Reactors Branch No 5 US Nuclear Regulatory Commission Washington, DC 20555 DOCKET.50-255 - LICENSE DPR PALISADES PLANT - RESPONSE TO ADDITIONAL NRC QUESTIONS
- REGARDING ADEQUACY OF STATION POWER A conference cal*l was held September 15, 1981 between Consumers Power Company
- and NRC personnel to discuss the adequacy of station voltage for our Palisades Plant. As a result of that conference c8.ll, Consumers Power Company was requested to forward certain addl.tional information regarding the Palisades station pow~r system for NRC review . . Our response to that request on an _i tern*
-by item basis*is provided in the attached package.
*~
Thomas C Bordine Staff Licensing Engineer CC JGKeppler, USNRC NRC Resident Inspector - Palisades Attachment Aois-s
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**-.-1 e110190568 e11012*
PDR .ADOCK 05000255
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RESPONSE TO ADDITIONAL NRC QUESTIONS REGARDING ADEQUACY OF STATION POWER FOR THE PALISADES PLANT NRC Item 1 Boric Acid Pump P56A is operating below its minimum full load manufacturer voltage rating of 90% during L0CA conditions concurrent with a l.00 per unit system voltage. Are there any additional motors subjected to a similar under-voltage condition? Response to It*em 1 For the conditions simulated, Boric Acid Pump P56A and the Containment Recirculating Fans V-lA, V-2A and V-3A are operating at 0. 9% below their minimum 90% voltage rating. In addition, it should be noted that the calcu-lated voltage on Bus 12, MCC #2 and MCC #8 is 0.869 pu, 0~868 pu and 0.863 pu, respectively, on a 480 volt base. Given the magnitude of these voltages and the fact that the motor feeder cable voltage drops have not been considered, any 46ov motor fed from these sources will more than likely be served slightly below their 90% voltage rating. The following discussion pertains to the voltage assumptions made for the most recent studies (1980) and to the operat~on of induction motors slightly beyond their minimum voltage rating. TRANSMISSION NETWORK VOLTAGE A formal procedure for the annual review of the transmission network voltage at the off-site power supplies of Big Rock Point, Palisades and Midland has been implemented. The review considers (a) historical operating data, and (b) conditions projected over the next five years. The minimum and maximum transmission network voltage during LOCA conditions is determined assuming a single-failure condition (Reference GDC 17 and NUREG 75/087 II-1.b).
2 The December 1980 i studies performed for Palisades assumed a minimum trans-mission network voltage of 1.00 pu. This minimum voltage, however, assumed multiple transmission. failures and generator outages. Therefore, the assumed conditions are not representative of the single-failure criterion. The Consumers Power Company expects the single-failure minimum transmission network voltage at Palisades to exceed 1.00 pu to a level such that the slight undervoltage problem on Bus 12, MCC #~and MCC #8 is eliminated during LOCA conditions. The formal review of the transmission network voltage at Pal-isades is scheduled for completion by April of 1982. It is dependent on the timely completion of the Big Rock Point studies currently in progress. Upon completion of that review, an accurate evaluation of which motors are truly subjected to undervoltage conditions will be possible. At that time, cor-rective action will be proposed, if necessary. OPERATING INDUCTION MOTORS BELOW THEIR MINIMUM VOLTAGE RATING An induction motor can operate continuously at +/- 10% of :~s nameplate voltage rating, and at its full load HP rating, without incurri~g any additional loss of iife to its insulation system or jeopardizing its capability of driving its connected load. (Refer to NEMA Standard MG-1-1978, paragraph MG-1-12.43.) No load operation can also be maintained at approximately 10-20% of its .name-plate voltage rating. Therefore, operation at voltages between 20% and 90% of nameplate requires a reduction in the horsepower (hp) capability of the motor. This hp reduction is necessary to assure normal life expectancy and adequate torque to drive its connected load. The boric acid pumps are* 460V, 30 hp motors with an estimated 18 hp of connected shat't load* during LOCA conditions. The required derate at an 89 .1% operating voltage would be approximately 1.34% giving a new motor capability of 29.6 hp. This is far above its 18 hp connected shaft load. Similarly, the containment recircu-lating fans are rated 46ov, 75 hp with an estimated 54 hp .of connected shat't load* during LOCA conditions. Using the same 1.34% derate, the new motor capability would be 74 hp. Again, this is well above the required 54 hp connected shat't load. In summary, the 1.3% torque derate associated with the 10.9% calculated undervoltage condition would not reduce the motor torques below their load torques nor exceed the therma,l ratings of the motors. NRC Item 2 Provide the speed-torque and speed-voltage curves for charging pumps P55A and P55B during LOCA conditions. Response to Item 2 The required speed-torque and voltage-speed curves during LOCA conditions are provided in Attachment 1. These curves are based on: 1) the 100% voltage speed-torque curves and constant load torque values provided by the manufacturer and 2) analytical studies using the verified Pll61 computer model of the Palisades Plant {the manufacturer data is provided along with Bechtel calculations in Attachment 2).
- Based on Bechtel calcutations, "Diesel Generator Resequence Study", sub Job #12447-042, 1980.
'*~ 3 NRC Item 3 Evaluate the need to develop procedures to limit placing three (3) buses (lC, lD and lE) on the reserve transformer. Response to Item 3 Item 6.2.2 of Palisades Plant Operating Procedure SOP-30 "Station Power" (see Attachment #3) includes a caution statement that, in effect, provides proper control over the use of, and application of load to, the plant's
- reserve trans former. Item 6. 2. 2 states: "Total load on the reserve trans-former shall be limited to 1200 amps due to station power transformer #71 supply ( 252-304) being rated at 1200 amps. The reserve transformer shall not be used during start-up cir power operations."
Utilizing 1200 amps as the maximum transformer loading is acceptable since its low side rating is (5 X 106)/ ((Y3)(2.4 X 103)] amp.-:; C"r 1203 amps assuming unity power factor (see Attachment 4, Dwg E-3 for transformer ratings). In* add~tion to these calculations, actual plant data reveals that a 1200 amp limitation is an acceptable value. Based on plant log sheet readings for 7/21/81 (while the plant was in cold shutdown) the megawatt readings for buses lC, lD and lE were 1.35, 1.15 and 0~90 MW, respectively. The current readings to each bus were 400, 320 and 280 amps, respectively. These typical megawatt readings and current readings when summed, equal 3.40 MW and 1000 amps, respectively. Assuming that these buses were be:ing fed at that time from the reserve transforme6, the transformer would have been loaded to only ((Y3)(2.4 X 103)(1000)] /10 MVA or 4.16 MVA. This load would have only been 83% of the transformer's nameplate rating of 5 MVA. Although the caution statement does not spec~fy whether the 1200 amp limit-ation applies to the high side or the low side of the transformer, a strong inference is made to the reserve transformer's low side throughout the trans-former's loading procedure. In addition, the plant staff has indicated that this 1200 amp limitation is observed on the transformer's low side by summing the indications on the ammeters that monitor the current flow to the 2400V buses lC, lD and lE (see Dwg E-3, Attachment #4). In support of the plant's assertion is the fact that no current monitoring devices are installed on the transformer's high side which coUld be used to monitor reserve transformer loading (see E-703, Attachment #5). Nevertheless, the caution statement of Item 6.2.2 of Procedure SOP-30 will be revised to more clearly indicate that the 1200 amp limitation applies to the reserve transformer's low side and not i~s high side winding.
.* . i
;-: I TONR 63-81 ATTACHMENT 1 PALISADES-LOCA CONDITIONS (Page 1 of 4)
CHARGING PUMP PSSA C440v 100hp)
. SPEED vs TORQUE 600 550 500
~ 450 ~ 400
~ 350
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..... .. . . **:. \.
TONR 63-81 ATTACHMENT 1 PALISADES-LOCA CONDITIONS (Page 2 of 4) CHARGING PUMP P55A C440v 100hp) PER UNIT MOTOR TERMINAL VOLTAGE vs SPEED 1 . 000 0,950 I]} (/) 0.900
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- 0.750
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'. TONR 63-81 ATTAC.HMENT 1 PALISADES-LOCA CONDITIONS (Page 3 of 4)
CHARGING PUMP P55B C440v 75h~) SPEED VG TORQUE 500 450 - 400
~ 350
-. :.:, 300 -+- LOAD TORQUE
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TONR 63-81 \ ATTACHMENT l PALISADES-LOCA CONDITIONS (Page 4 of 4) CHARGING PUMP P55B (440v 75hp) PER UNIT MOTOR TERMINAL VOLTAGE vs SPEED 1 . 000 0.950 -- CJ) (/)
- 0. 900
~ 0. 850
> 0. 800 0~ 0. 750 3-w 0. 700
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. **.'-: .... GAUL1ii( COR~ORATlOf'J . a Carden*Str. .Everett, Mauachuaell1 02149 * (617) 387*930l9Teru: 094*9415 Cable: IUNOALlll APPc.~ DI "I. K. SH* 4 oJ Ib October 14, 1980 Bechtel Associates Professional Corp.
P. 0. Box 1000 Ann Arbor, Michigan 48106 Attention: C. A. St. Onge Project Engineer
Subject:
Bechtel letter dated 5/29/80 Bechtel Job 12447-042 File: 0269 BEV-GC-056 .:.t Gentlem;n: On September 8, 1980, Gaulin Corporation respondec! to above subject letter *
. At that time, we indicated that no information on items b ~nd c was available.
Since then, we have been able to obtain some __ information from G. E., and have attached same. We trust that thfs will fully answer your inquiry. Very truly yours,
,...- _,. .r... . /.* / . .
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J . A. MALONE"-.. Contracts Coordinator encl.
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- 1 WASHINGTON STREET DIVISION WELLE~LEV, MASSACHUSETTS 02181, Phone (617l 237-2050-APPE-<< 01 X K SH* S
- 1*1-Cu3V~ FOR l*:ODE!.S 5Y.G404A::2i9 e.Ild 51:G365Af:217 RECC:i*..:~D SEP 2 9 i900 GAULIN CORP.
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GAUL- COHPORl-'.TIDN Carden Slleet, Everett, Mas~achu~ells 02149 * (617) 387-9300 Telcz: 094-9415 Cable: l'-ANCALIN S~ptember 8, 1980 Bechtel Associates Professional Corp. P. 0. Box 1000 Ann Arbor, Michigan 48106 Attention: . C. A. St. Ong~. Project Engineer
Subject:
Bechtel letter dated 5/29/80 Bechtel Job 12447-042 File: 0269 BEV-GC-056 Gent1 emen: The following is in response to questions rendered in your correspondence of May 29, 1980, relative to pump/motor data for .. load resequencing study for Consumers Pm*:er .. Item a. See attached calculation . Item b. Due to age of motor, this information not available from motor vendor. Item c. Same as Item b. 1tern d. J'l1e>torqt.ie *c:h~actefJsti c<curve:.f"a*r.* both *1>i:inips *; s
!c~nsta.nt~- See attached-calculation_1Pl8 **- .4.l9_ft~~.lb.;
u>.45..:- .._-: *29.L.fk_: lb.) *. Item e. Power factor: Rated Load 3/4 Load 1/2 Load P18 , 80 75 64 P45 82 77.5 68.5 We trust the above information answers your inqui;y. Very truly yours,
........--n /~*7"':.-// -
Y)'v/ / <:'h-~r.>~. J: A. Ml\ l CJiit Contracts Coordinator
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¥.r. Chsrles A. Dexter
!*:.:i:1<:sg~r, ~:ari:cting ~cinistration Gaulin Corpcr~tion *
(~ Gurc~n Street
!:vcrett, ::~~s 021~ 9 r~lisnd~~
Consuncrs Power Co~pany D~chtel ~ob 12~,7-042 I>WU1/J.~070r. D,\TJ\ F'O~ LC."~D RESEQUZ:i'.~CIHG S7UDY
*- *.. Filez
- 026~
BEV-GC-056
Dear r.r. D~:
tcrz ht the ragc!?st of Cori!>ur.;.c::rs ?ot.*er Cc."'.lpi::.ny, nechte-1 i:; co=1-ductlng a voltage regul~tion study for Palisac~s ~uclc&r Plant to detcrrdnc.- various bus voltage~ -;.*hen po;.:cr is sup?lied by c~crgcncy dic~cl generator=. In this rcg~rd, nechtel h~s been advi~ed by Cc~buGtion En7inecrin9 to contact vour co=~any to obtain son~ dats for the nu~~~/~otor~ t:upplied by.. r-~anton-Gaulin for ConSU::1Cr .I?Q\.;er Cor:puny** s Pc..liznoes Project.
- The order for the pu:::ps was placed by Co::lbustion Engineering (P.O. 170-3692) for charging sy~te~ co~prising .of two pu~ps with 75 H? r-~tors and one pu~p vitb 100 EP noter each rated
(,COV, 1775 RP~, 3 ph~se, 60!!Z Cl rip proof. The ?nodel nu=:.bers and. the serial nu~rs for these pur.:p~/~_otors are as f ollc\.*s i
~. 100 E? v~riable ca?acity charging pu~?
Pump r-.:>d!!l ~o. P-<5-3TPSX ~nd £erial no. ~-6C-33Bl Uotor r-od<?l no. SKGO:O~At: and serial l;o,. AD053030
- (GE requisition Ho. 297-72716)
- b. 75 IIP charging pu~ps Pur.ip oodel r:o. 2-18-JT?SX and serial r:o. {-Ge-3879/30
~otor c:ode1 Ico. St~G365AK217 and 5erial Ho **~0053020/21 (GE requisition So. 2~7-72716)
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- ~e ~:11"! llVi")rcciatc: it. if you c~n tran5i"Jlt the follo':Jing do ta at the c~rlicst, preferably b~forc ~unc 6 1 1980, for each of the l!!Jove r.otors/pu=.ps. ..
- o::.~nt of inert!~ in lb-*f t 2 :~f . the~ ::otor 4::ld tho pu:7.p inclu~ing the coupling. *
- b. Zpcr:a-torquc characteristic .curves !or tha .r.iotors. . __ .:.
- c. Zpccd-currcnt.chnr~cteri~tlc curve for the notor:
- c. Spec~-torqua . ch~ractcrictic
. . . curve (or the pun?* ..
- c. Por.*cr !actor of the cotor .<!t locl:~d rotor (or startinq) condition, ~.t:_ful:~.load an~ at ~~l~!.Joc::d.-::~_:-_.,_ -*-*---- ~ -*
In ct:.::;a ~tou have ~y quc:.tic:l~, plea::c co:1t.'2ct the *._*r!tcr~*
*,. Very .tru~y your~,
Original Signed By: C. A. SL .Onge C. A. St. Onge
' Proj~ct ~nJine~r
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TONR 63-81
*Station Power - SOP 30, . . 0 ATTACHMENT 3 ~ "* VI. . ;* *age 1 of 2
- i: .. :.
- 5. On bus lE, scope and close incoming breaker: Station power ()
. *,* 152-302; start-up 152-303 .
7
.~ .. *... 6. Check alternate incoming breaker to* lE tripped, then turn its control switch to the "trip" position to display the green target in the switch.
6.2.2 *To Supply 2400 V Buses lC, 1D and lE From the Start-Up Reserve Transformer
~ -:.
..!r.. CAUTION: Total load on the reserve transformer shall be limited to 1200 amps due to station power transformer No. 71 supply (252-304) being rated at 1200 amps. The reserve transformer ~hall not be used during start-up or power operations. Refer to Technical Specifications 3.7 *
- 1. If plant loads are being fed from the start-up transformer (1-2):
*t~.
~ .
- a. Transfer load from bus lC to Diesel Generator No. 1-1.
- b. Open start-up incoming breaker 152-106.
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J c. Transfer load from bus lD to Diesel Generator No. 1-2. d *. Open start-up incoming breaker 152-202.
- e. Str~p loads from buses lE, IA, lB, lF and lG.
I f. Open start-up incoming breaker 152-303 on bus lE.
- 2. Take the start-up transformers out of service per Region Power Controllers (SOR required).
NOTE: Working clearance required for Step 3.
- 3. Have electricians remove the-disconnect lin..~s on start-up*
transformer 1-2 and place on the reserve transformer. NOTE: The high-voltage site of 1-2 start-up transformer will probably have to be physically disconnected at this time for later working clearance.
- 4. Have System Protection and Lab Services:
- a. Withdraw from the case the differential relays 487-$2.
(These must remain withdrawn while the,reserve transformer is
..*,* in service.)
- b. Place overcurrent relays 450/451 52 in withdrawn position.
(These must remain withdrawn while the reserve transformer is in service.) . J\' II V FOR INFORMATION O.~ -* * :* 6*
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v- ._ .. Station Power - SOP 30-ev 0 A TONR 63-81 9 ATTACHMENT 3 * (Page 2 of 2)
- 5. Return start-up transformers to service per RePoCo.
- 6. Check closed 4160 V breaker 252-302. to bus lF and voltage normal.
NOTE: Ensure no loads other than lighting on load center 71.
- 7. Close.4160 V breaker to load center 71 (252-304) at bus iF. This step energizes the reserve transformer.
- 8. Scope and close 2400 V breaker IS2-106 (start-up incoming breaker) to bus IC. Remove Diesel Generator 1-1 from service.
- 9. Scope and close.2400 V breaker 152-202 (start-up incoming breaker) to bus ID. Remove Diesel Generator 1-2 from service.
- 10. If loading permits (see CAUTION above) scope and close 2400 V breaker 152-303 (start-up incoming breaker) to bus lE.
6.2.3 To Remove Start-Up Reserve Transformer From Service
- 1. Transfer the load from bus IC to Diesel Generator 1-1 and open start-up incoming breaker 152-106.
- 2.
- Transfer the load from bus ID to Diesel Generator 1-2 and open start-up incoming breaker 152-202.
_3. Strip loads from buses IE, IA, lB, lF and lG and open start-up incoming breaker 152-303 on bus IE.
- 4. Take the start-up transformer out of service per Region Power Controller (SOR required).
!!Q!!: Working clearance required for Step 5.
- 5. Have the electricians remove the disconnect links on the reserve transformer and place on the start-up trans~ormer 1-2.
- 6. Have System Protection & Lab Servi~es:
- a. Replace overcurrent relays 450/541 S I back in their cases.
- b. Replace differential relays 487 - S 2 back in their cases.
- 7. Return start-up transformer to service per RePoCo.
- 8. Scope and close 2400 V breaker 152*106 (Start-up incoming
*breaker) to bus lC. Remove Diesel Generator 1-1 from service.
- 9. Scope and close 2400 V breaker I52-202 (start-up incoming breaker) to *bus ID. Remove Diesel Generator 1-2 from service.
') pa0280-1049a-89 FOR INFORMATION ONq . Y
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