ML20079C136

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Monthly Operating Repts for May 1991 for North Anna Units 1 & 2
ML20079C136
Person / Time
Site: North Anna  Dominion icon.png
Issue date: 05/31/1991
From: Mladen C, Stewart W
VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:
NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
91-332, NUDOCS 9106180460
Download: ML20079C136 (15)
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Jurio 13, 1991 U. S. Nuclear Regulatory Commission Serial No. 91 332 Attention: Document Control Desk NL&P/JMJ:Jmj Washington, D.C. 20555 Docket Nos. 50 338 50 339 Ucense Nos. NPF 4 NPF 7 Gentlemen:

VIRGINIA ELECTRIC AND POWER COMPANY NORTH ANNA POWER STATION UNITS 1 AND 2 MONTHLY OPEHATING REPORT Enclosed is the Monthly Operating Report for North Anna Power Station Units 1 and 2 for the month of May 1991.

I Vey truly /ur , ;

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W. L. Stewsrt Senior Vice President Nuclear Enclosures

cc: U.S. Nuclear Regulatory Commission i 101 Marietta Street, NW Suite 2900 Att,sia, GA 30323 Mr. . A. S. Lesser NRC Senior Residor.t inspector North Anna Power Station l . .s. 3 '.' O b 9106180460 910531 PDR ADOCK 05000336 t

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5 VIRGINIA POWER COMPANY NORTH ANNA POWER STATION MONTHLY OPERATING REPORT MONTH: _liav YEAR 1991 Approved:

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, OPER AtlNG DAT A REPORT DOCKET h0.: 50 338 DOCKET Wo.: 50 338 DATE: June 3, 1991 COMPLETED BY C. MLaden PHohts (703) 894 2774 OPERATINO STATUS

1. Unit Names................................ North Anna 1
2. Reporting Feriodt.........................May 1991
3. L i cens ed Thermal Power (MWt ): . . . . . . . . . . . . . 2,893 4 Nameplate Rating (Gross MWe):............. 947 S. Design Electrican Rating (Net MWe):......, 907
6. Maximm Deperdable Capacity (Cross MWe):.. 959
7. Maxinan Dependable Capacity (Net MWe):.... 911
8. If e.hanges occur in capacity Ratings (Items No. 3 thru 7) since last report, give reasons:

N/A

9. Power Level to which restricted, If any (het MWe): _ N/A
10. Reasons for restrictions, if any: N/A This Month Y-t-0 C eutative
11. Hours in keporting Period................................ 744.0 3,623.0 113,435.0
12. Nurter of Hours R eact or was c r i ti cal . . . . . . . . . . . . . . . . . . . . . 521.0 2,082.6 82,073.5
13. Reactor Reserve Shutdown Hours........................... 20.4 42.0 6,645.6
14. Hours Generator 0n Line.................................. 413.5 1,944.4 79,164.4
15. Unit Reserve Shutdown Hours.............................. 0.0 0.0 0.0
16. Gross Thermal Energy Generated (MWH).... ............... 1,022,552.9 4,820,065.7 209,806,301.7
17. Cross Electrical Energy aenerat ed (MWM). .. . .. . . . . . . ..... 327,240.0 1,584,106.0 68,925,444.0
18. Net E lectrical Energy Cenerated (MWH) . . .. . . . . . . . . . . . . . . . . 309,106.0 1,500,125.0 65,228,877.0
19. Unit service Factor...................................... 55.6% 53.7% 69.8%
20. Uni t Ava l t abi l i t y Fac tor. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55.6% 53.7% 69.8%
21. Uni t Capac i t y F act or (us i ng MDC Net ) . . . . . . . . . . . . . . . . . . . . . 45.6% 45.5% 64.2%
42. Uni t Capac i t y F ac t or (us ing DER Net ). . . . . . . . . . . . . . . . . . . . . 45.8% 45.7% 63.4%

! 23. Forced Outage Rate....................................... 44.4% 14.5% 12.6%

l. 24. Shutdowns scheduled over Next 6 Months (Type, Cate, and Duration of Each): _None 1

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l 25. If Shutdown at end of Report Period, estimated time of Startup: N/A

26. Units in fest Status (Prior to Comercial Operation):

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I forecast Achieved INITIAL CRITICALITY .

INITIAL ELECTRl('IfY _

COMMERCIAL OPERAil0N l

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AVERAGE DAILY UNIT POWER LEVEL Dockst No.: 30-338 Unitt NA-1 Dato: ,,J_u1Le_L 199J_

Completed by: C. Mladen Phonet 1703) 824-2774 MONTHt _Jiay 1991 DAY AVERAGE DAILY POWER DAY AVERAGE DAILY LEVEL LEVEL (MWo-Not) LEVEL (MWo-Not) 1 916 17 0 2 916 18 0 3 915 19 0 4 892 20 0 5 55 21 0 6 0 22 0 7 528 23 197 8 909 24 319 9 916 25 798 10 865 26 879 11 211 27 880 12 50 28 882 13 0 29 889 14 0 30 889 15 0 31 888 16 0 Instructions:

On this format, list the average daily unit power level in MWe-Not for each day in the reporting month. Compute to the nearest whole megawatt.

- 4 UNIT SilUTDOWNS AND POWER REDUCTIONS DOCKET NO.: 50-338 UNIT NAME: NA-1 DATE: June 3, 1991 COMPLETED BY: C. Mladen REPORT MONTH: May 1991 PHONE: (703) 894-2774 4 5 3

1 2 Licensee System Component Cause & Corrective Date Type Duration Reason Method of Code Action to No. Shutting Event Codo' (hrs) Report # Prevent Recurrence Down Reactor 9 N/A TB RLY Corrective maintenance 91-02 910505 F 0 on Main Generator -

maintained reactor J power 012% during i i

repairs AB ISV Increasing Unidentified 910509 F 0 9 N/A RCS Leakage -reduced 91-03 reactor power to 030%

to investigate N1-91-011 AB ISV Reactor shutdown due to 91-04 910511 F 330.5 1 RCS Pressure Boundary Leakage 3: Method 4:

1: Type 2: Reason 1= Manual Exhibit F - Instructions F= Forced A= Equipment Failure (explain) 2= Manual Scram for preparation of Data S= Scheduled B= Maintenance or Test 3= Automatic Scram Entry Sheets for Licensee C= Refueling 4= Continuations Event Report (LER) File D= Regulatory Restriction 5= Load Reduction (NUREG-0161)

E= Operator Training & License Examination 9=Other

. F= Administrative 5:

G= Operational Error Exhibit H - Same Source H=Other (explain)

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Page 1 of __2 UNIT SHUTDOWN AND POWER REDUCTIONS Explanation sheet Docket No.: 50-338 Report Month May Unit Names NA-1 Yeart 1991 Date June la 1991 completed by: Cathie Mladen

  1. 91-02 May 5, 1991 Main generator taken off-line at 0431 hours0.00499 days <br />0.12 hours <br />7.126323e-4 weeks <br />1.639955e-4 months <br /> for corrective repairs to the main generator. Reactor power maintained at approximately 12%.

May 7, 1991 Main generator placed on-line at 0341 hours0.00395 days <br />0.0947 hours <br />5.638227e-4 weeks <br />1.297505e-4 months <br />. Cleared 30%

power chemistry hold at 0744 hours0.00861 days <br />0.207 hours <br />0.00123 weeks <br />2.83092e-4 months <br />. Commenced unit ramp-up at 0.3%/ minute at 0808 hours0.00935 days <br />0.224 hours <br />0.00134 weeks <br />3.07444e-4 months <br />.

May 8, 1991 Unit stable at 98% power at 0700 hours0.0081 days <br />0.194 hours <br />0.00116 weeks <br />2.6635e-4 months <br /> with all turbine governor valves full open.

  1. 91-03 May 9, 1991 Commenced unit ramp-down to 30% power at 1925 hours0.0223 days <br />0.535 hours <br />0.00318 weeks <br />7.324625e-4 months <br /> to investigate increasing unidentified RCS Icakage.

Ma'f 10, 1991 Unit stable at 30% power at 0033 hours3.819444e-4 days <br />0.00917 hours <br />5.456349e-5 weeks <br />1.25565e-5 months <br />. Investigation of increasing RCS leakage continuing.

  1. 91-04 May 11, 1991 Commenced unit shutdown at 0500 hours0.00579 days <br />0.139 hours <br />8.267196e-4 weeks <br />1.9025e-4 months <br /> due to RCS pressure boundary leakage. Main generator off-line at 0614 hours0.00711 days <br />0.171 hours <br />0.00102 weeks <br />2.33627e-4 months <br />.

Mode 3 entered at 0632 hours0.00731 days <br />0.176 hours <br />0.00104 weeks <br />2.40476e-4 months <br />. Mode 4 entered at 1144 hours0.0132 days <br />0.318 hours <br />0.00189 weeks <br />4.35292e-4 months <br />. Mode 5 entered at 1629 hours0.0189 days <br />0.453 hours <br />0.00269 weeks <br />6.198345e-4 months <br />.

May 20, 1991 Entered Mode 4 at 0309 hours0.00358 days <br />0.0858 hours <br />5.109127e-4 weeks <br />1.175745e-4 months <br />. Entered Mode 3 at 0946 hours0.0109 days <br />0.263 hours <br />0.00156 weeks <br />3.59953e-4 months <br />.

, May 21, 1991 l Entered Mode 2 at 1331 hours0.0154 days <br />0.37 hours <br />0.0022 weeks <br />5.064455e-4 months <br />. Unit stable at 3% power at l 1409 hours0.0163 days <br />0.391 hours <br />0.00233 weeks <br />5.361245e-4 months <br />. Main generator exciter field breaker tripped I at 1655 hours0.0192 days <br />0.46 hours <br />0.00274 weeks <br />6.297275e-4 months <br />. Manually tripped Main turbine at 1819 hours0.0211 days <br />0.505 hours <br />0.00301 weeks <br />6.921295e-4 months <br /> due to corrective maintenance required on Main generator exciter.

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1 Page 2 of 2 UNIT SHUTDOWN AND POWER REDUCTIONS Explanation Shoot (Continued)

May 23, 1991 Entered Mode 1 at 0101 hours0.00117 days <br />0.0281 hours <br />1.669974e-4 weeks <br />3.84305e-5 months <br />. Main generator on-line at 0133 hours0.00154 days <br />0.0369 hours <br />2.199074e-4 weeks <br />5.06065e-5 months <br />. Unit stable at 30% power at 0235 hours0.00272 days <br />0.0653 hours <br />3.885582e-4 weeks <br />8.94175e-5 months <br />.

May 24, 1991 Commenced unit ramp-up to full power at 1505 hours0.0174 days <br />0.418 hours <br />0.00249 weeks <br />5.726525e-4 months <br />.

May 25, 1991 Unit stable at 98% power with all turbine governor valves full open at 1000 hours0.0116 days <br />0.278 hours <br />0.00165 weeks <br />3.805e-4 months <br />.

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NORTH ANNA POWER STATION E UNIT NO. 1 MONTH: May__

Page 1 of 2

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ft.MMARY U OF OPEMTlNG EXEERIEN_CLE sequence summary Listed below in chronological in a of operating experiences for this month which required load reductions or resulted in significant non-load related incidents.

Data Tims DAin

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Began month 100%,

} May 01, 1991 0000 960MWo.

with unit at May 04, 1991 2100 Commenced unit ramp-down due to need to perform corrective maintenance on Main generator.

May 05, 1991 0431 Main generator off-line. Reactor power maintained at approximately 12%.

May 07, 1991 0341 Main generator on-line commencing unit ramp-up.

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0744 Cleared 30% chemistry hold.

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0808 Commenced unit ramp -up at 0.3%/ minute.

May 08, 1991 0700 Unit stable at 98% with all turbine governor valves full open.

May 09, 1991 1925 Commenced unit ramp-down to 30% to investigate increasing unidentified RCS leakage.

May 10, 1991 0033 Unit stable at 30% powei- with investigations into source of RCS leakage continuing.

May 11, 1991 0500 Commenced unit shutdown due to RCS pressure boundary leakage.

0614 Main generator off-line.

0632 Mode 3 entered.

1144 Mode 4 entered.

1629 Mode 5 entered.

May 20, 1991 0309 Mode 4 entered.

0946 Mode 3 entered.

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, NORTH ANNA POWER STATION l UNIT NO. 1 MONTH: May Page 2 of 2 S.UMMARY OF OPERATING EXPERIENCE 9 ate Time Data May 21, 1991 1331 Mode 2 entered.

1409 Unit stable at 3% power.

1655 Main generator exciter field breaker tripped.

1819 Manually tripped Main turbine due to need for corrective maintenance on the Main generator excitor.

May 23, 1991 0101 Mode 1 entered.

0133 Main generator on-line.

0235 Unit stable at 30% power.

May 24, 1991 1505 Commencing unit ramp-up to full power.

May 25, 1991 1000 Unit at 98% power with all turbine governor valves full open.

l May 29, 1991 0002 Reactor power at 100% due to performance of 1-TOP-31.3 which bypasses a portion of feedwater to the 1st point heaters, j May 31, 1991 2400 Ended month with unit at 100%, 936 i

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OPERATING DATA REPORT DOCKET No.: 50 339 DATE: June 3, 1991

- COMPLETED BY: C. Mladen i PHohEt (703) 894 2774 OPERATING STATUS

1. Uni t N ane t . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . N or t h Anna 2
2. R e po r t ing Per i od s . . . . . . . . . . . . . . . . . . . . . . . . .May 1991
3. Licensed Theren t Power (WWt) . . . . . . . . . . . . . 2893 4 N amepl a t e Rat ing (Gross MWe) . . . . . . . . . . . . . 947
5. Design Electrical Rating (Net MWe):. .... 907
6. Maalmum Dependable Capacity (Gross MWe) .. 957
7. Maximum Dependable capacity (Net MWe):.... 909
8. If changes occur in Capacity Ratings (Items ko. 3 thru 7) sinc 9 last report, give reasons:

N/A

9. Power level to which restricted, if any (Net MWe): ___N/A
10. Reason. for restrictions, if any: NsA This Month Y*t D Cumulative
11. H our s i n R epor t i ng P e r i od. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 744,0 3,623.0 91,703.0
12. Number of Hours Reactor was Cri t ical . . . . . . . . .. . . . . . . . .... 744.0 3,623.0 74,757.3
13. Reactor Reserve shutdown Hours.................... ...... 0.0 0.0 5,949.6
14. Hours Generator 0n-Line.................................. 744.0 ,

3,623.0 73,857.3

15. Unit Reserve Shutdown Hours.............................. 0.0 0.0 0.0
16. Gross thermal Energy Generated (HWH).. .. . . . . ........... 2,148,226.1 10,474,923.7 197,724,037.1
17. Gross E lec t ri cal Energy Generat ed (MWH) . . . . . . . . . . . . . . . .. . 704,321.0 3,470,821.0 64,773,407.0
18. N e t E l ec t r i c a l E ner gy Gene r a t ed ( MWH ) . . . . . . . . . . . . . . . . . . . . 669,930.0 3,305,588.0 62,121,068.0
19. Unit service Factor...................................... 100.0% 100.0% 80.5%
20. Unit Availability Factor................................. 100.0% 100.0% 80.5%
21. Uni t Capac i ty F ac t or (usi ng MDC Net ) . . . . . . . . . . . . . . . . . . . . . 99.1% 100.4% 75.3 %
22. Uni t Capac i ty F ac tor (us i ng DER N et ) . . . . . . . . . . . . . . . . . . . . . 99.3% 100.6% 74.7%
23. Forced Outage Rate............................. ......... 0.0% 0.0% 6.0%
24. Shutdowns Scheduled Over Next 6 Months (Type, Date, and Duration of Each): __None
25. If Shutdown at end of Report Period, estimated time of Startup: N/A
26. Units in Test status (Prior to Commercial Operation):

Forecast Achieved IhlTIAL Crit!CALITY INiilAL ELECTRICITY COMMERCIAL OPERATION

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AVERAGE DAILY UNIT POWER LEVEL Docket No.: 50-339 Unit: NA-2 Date: June 3. 199(_

Completed by: C. Mladen Phones (703) 894-2774 l

MONTH: May 1991 l

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DAY AVERAGE DAILY POWER DAY AVERAGE DAILY LEVEL LEVEL (MWe-Net) LEVEL (MWe-Net) 1 914 17 890 2 914 18 887 3 898 19 901 4 903 20 908 5 912 21 908 ,

6 911 22 906 I 7 915 23 906 8 917 24 906 9 906 25 904 10 899 26 904 11 900 27 903 12 _ 899 28 901 13 876 29 902 14 848 30 9.Q 3 15 880 31 904 16 890 Instructions:

on this format, list the average daily unit power level in MWe-Not for each day in the reporting month. Compute to the nearest whole megawatt.

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DOCKET NO.: '

50-339 UNIT NAME: NA-2 l DATE: June 3, 1991 REPORT MONTH: May 1991 COMPLETED BY: C. Mladen ,

PHONE: (703) 894-2774 i

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No. Date Type Duration Reason Method of- Licensee System Component Cause & Corrective (hrs) Shutting Event Code Code Action to

' Down Reactor Report / Prevent Recurrence  ;

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l ONo entry this month j i  :

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+ t l1: Type 2: Reason 3: Method 1= Manual 4:

Exhibit F - Instructions j

l F= Forced A= Equipment Failure (explain)  :

! S= Scheduled B= Maintenance or Test 2= Manual Scram for preparation of Data  !

l C= Refueling 3= Automatic Scram Entry Sheets for Licensee j i D= Regulatory Restriction 4= Continuations Event Report (LER) File E= Operator Training & License Examination 5= Load Reduction (NUREG-Ol61) l j F= Administrative 9=Other  !

G= Operational Error 5:

l H=Other (explain) Exhibit H - Same Source i

4 Pago 1 o f _.1 UNIT SIIUTDOWN AND POWER REDUCTIONS Explanation Sheet Docket No.: 50-339 Report Month May Unit Name: NA-2 Year: _J991 Date: June 3. 1991 completed by: Cathic Mladen

  • No entry this month l

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NORTH ANNA POWER STATION UNIT NO. 2 MONTH: May Page 1 of 2 SMMMARY OF OPERATING EXPERIENCE Listed below in chronological sequence is a summary of operating experiences for this month which required load reductions or resulted in significant non-load related incidents.

Date Time Data llay 01, 1991 0000 Began month with unit at 100%,

960MWe, May 03, 1991 0900 Commenced unit ramp-down to 880MWe for TVFT.

1040 TVFT completed satisfactorily.

1130 Commenced unit ramp-up to 100%.

1238 Unit stable at 100%.

1547 Removed "C" high pressure heater drain pump from service for corrective maintenance.

2116 Returned "C" high pressure heater drain pump to service.

( 2217 Removed "A" high pressure heater drain pump from service for corrective maintenance.

May 04, 1991 1241 Returned "A" high pressure heater l drain pump to service.

May 09, 1991 0906 Removed "C" high pressure heater

, drain pump from service due to high

) vibrations.

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NORTH ANNA POWER STATION UNIT NO.I 2 MONTH: May Pago 2 of 2

SUMMARY

OF OJERATING EXPERIll[C]

D9ht Ti&9 D91A May 13, 1991 1225 Removed "A" high pressure heator drain pump due to firo at pump.

1250 Commenced unit ramp-down to 900 MWo due to low Main foodwater pump suction pressure.

1341 Unit stablo at 900 MWo.

May 15, 1991 0423 Returned "A" high pressure heater drain pump to service.

0538 Commencci unit ramp-up to 100%

power.

0810 Unit stable ut 100% power.

May 19, 1991 0823 Returned "C" high pressure heater drain pump to service.

May 31, 1991 2400 Ended month with unit at 100%, 951 MWo.

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