ML20072C272
| ML20072C272 | |
| Person / Time | |
|---|---|
| Site: | North Anna  |
| Issue date: | 01/01/1983 |
| From: | Schmitendorf G VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.) |
| To: | |
| Shared Package | |
| ML20072C252 | List: |
| References | |
| NUDOCS 8303080379 | |
| Download: ML20072C272 (10) | |
Text
1 VIRGINIA ELECTRIC AND POWER COMPANY NORTH ANNA POWER STA, TION MONTHLY OPERATING REPORT MONTH December YEAR 1982 l
l APPROVED:
s-m l
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,1 STATION MAN V'
B303080379 830114 PDR ADOCK 05000338 R
pon
OPERATING DATA REPORT DOCKET NO.
50-338 DATE 01-01-83 CCMPLETED BY G. D. Schmitendorf TELEPHONE (703) 894-5151 X2502 OPERATING STATUS Notes 1.
Unit Name:
North Anna 1 2.
Reporting Period:
December 1982 3.
Licensed Thermal Power (MWt):
2775 4.
Nameplate Rating (Gross MWe):
947 5.
Design Electrical Rating (Net MWe):
907 6.
Maximum Dependable Capacity (Gross MWe):
918 7.
Maximum Dependable Capacity (Net MWe):
865 8.
If Changes Occur in Capacity Ratings (Items No. 3 thru 7) Since Last Report, Give Reasons:
NA 4
9, Power Level To Which Restricted, If Any (Net MWe):
N/A
- 10. Reasons For Restrictions, If Any:
N/A This Month Yr.-to-Date Cumulative 11.
Hours In Reporting Period 744 3,760 40,081 12.
Number of Hours Reactor Was Critical 71.5_
3,294.7 27,123 13.
Reactor Reserve Shutdown Hours 737.7 1,019.2 1,254.1 l
14.
Hours Generator On-Line 6.3 3,029.2 26,382.2 l
15.
Unit Reserve Shutdown Hours 0
0 0
l 16.
Gross Thermal Energy Generated (MWH) 3,774 7,945,102 68,259,354 17.
Gross Electrical Energy Generated (MWH) 1,122 2,539,010 21,784,532 i
l 18.
Net Electrical Energy Generated (MWH) 884 2,397,857 20,520,773 l
19.
Unit Service Fa ctor 0.8 34.5 65.8 l
20.
Unit Availability Factor 0.8 34.5 65.8 l
21.
Unit Capacity Factor (Using MDC Net) 0.1 31.6 59.2 l
22.
Unit Capacity Factor (Using DER Net) 0.1 30.2 56.4 23.
Unit Forced Outage Rate 99.0 22.4 7.2 24.
Shutdowns Scheduled Over Next 6 Months (Type, Date, and Duration of Each)-
None l
25.
If Shut Down At End Of Report Period. Estimated Date of Startup:
04-01-83 26.
Units In Test Status (Prior to Commercial Operation):
Forectst Achieved l
INITIAL CRITICALITY l
INITIAL ELECTRICITY COMMERCIAL OPERATION
l UNIT SHUTDOWNS AND POWER REDUCTIONS DOCKET NO.
50-338 UNIT NAME North Anna 1 DATE 01-03-83 REPORT MONTH December COMPLETED BY G. D. Schmitendorf __
TELEPHONE (703) 894-5151 X2502 l
2 No.
Date Type Duration Reason Method of Licensee System Component Cause & Corrective (Hours)
Shutting vent Code Code Action to 3
4 5
Down Reactor Report #
Prevent Recurrence 82-10 820517 S
88.4 C
The scheduled refueling outage has been completed.
(Generator on line 4.t 1626 at i
12-04-82).
82-11 821204 F
13.9 A
3 82-83 SF INSTRU The cause of the reactor trip t
was a Malfunction of Turbine EHC System which also was the cause of the safety injection that followed the trip.
j 82-12 821205 F
635.4 A
3 82-85 SF INSTRU The cause of the reactor trip was the failure of the "B" Phase Main Trainsformer. The safety injection which followed was due to two steam flow channels and the nuclear power range instrument that controls the feed regulation by pass i
valves in auto, all being in the trip position.
I 2
3 4
F: Forced Reason:
Method:
Exhibit F - Instructions S: Scheduled A-Equipment Failure (Explain) 1-Manual for Preparation of Data B-Maintenance or Test 2-Manual Scram.
Entry Sheets for Licensee C-Refueling 3-Automatic Scram Event Report (LER) File D-Regulatory Restriction 4-Continuations (NUREG-0161)
E-Operator Training & License Examination 5-Load Reduction F-Administrative 9-Other 5
l G-Operational Error (Explain) j H-Other (Explain)
Exhibit H - Same Source l
s
Page 1
of 2
UNIT SHUTDOWN AND POWER REDUCTIONS EXPLANATION SHEET DOCKET NO.
50-338 REPORT MONTH December UNIT NAME NA-1 YE.'.R 1982 DATE 01-03-83 COMPLETED BY G. D. Schmitendorf i
82-11 (A)
(3)
At 1648 on December 4,1982, with the Unit at 17% power, the reactor tripped, resulting in a turbine trip. This was fol-lowed by an Automatic Safety Injection. During the transfer of turbine control from " IMP OUT" to " IMP IN" the Turbine EHC System malfunctioned causing the turbine to start ramping up.
The governor valves stopped opening at the " Valve Position Limiter setting of 30%.
A transfer to manual turbine control and an attempt to restore the governor valves to their pre-transient position was made, however the turbine transient was too severe to allow recovery. The reactor tripped on a low steam generator level coincident with a steam flow / feed flow mismatch signal. An Automatic Safety Injection was initiated after the reactor trip from a high steam line flow coincident l
with low reactor coolant average temperature SI signal. All I
safety related equipment performed as designed. All conditions j
required by the emergency procedures to secure safety injection l
were met and the safety injection was terminated at 1658 on Decerber 4, 1982. Both the reactor trip / turbine trip and the.
Safety Tujection were caused due to the malfunction of a digital to analog converter in the Turbine EHC System. The appropriate l
emergency procedures were implemented, the plant stabilized, all parameters and equipment restored to normal, and the Turbine EHC System repaired.
l 82-12 (A)
(3)
At 1238 on December 5, 1982, with the Unit at 30% power, a reactor trip occurred as a result of "B" Phase Main Transformer I
failure. One minute after the trip an Automatic Safety In-I jection occurred. The safety injection actuation was from a Low-Low Tavg signal coincident with a High Steam Line Flow signal. The High Steam Line Flow signal was present prior to the reactor trip because two steam flow channels, F-1475 and F-1485, had been placed in trip at 0740 on December 5, after receiving erroneous readings from these channels. At no time l
during the event did actual steam line flow signals from the remaining channels warrant a safety injection. The Low-Low Tavg signal was received after the reactor trip due to over feeding of the steam generators via the main feed regulating 1
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of 2
bypass valves. The controlling valves, even though in auto-matic, received no closing signal because the instrument used to supply the signal, power range nuclear instrument N-44 was in trip. N-44 was in trip because it had not yet been cal-ibrated following detector replacement. When in trip N-44 allows the bypass valves to remain open and control steam generator level at the programmed no load condition, with the valves in automatic. The feed bypass valves were closed subsequent to receiving the Low-Low Tavg signal. All conditions required by the emergency procedures to secure safety injection were met and the safety injection was terminated at 1244 on December 5,1982. The appropriate emergency procedures were implemented, the plant stabilized, and all parameters and ECCS equipment restored to normal. The two steam flow channels F-1475 and F-1485 have been repaired.
Power range nuclear instrument N-44 is still in trip due to more data needed in order to calibrate the detector.
l 1
1 I
l l
-)
c AVERAGE DAILY UNIT POWER LEVEL DOCKET NO.
50-338 UNIT NA-1 DATE 01-01-83 COMPLETED BY G. Schmitendorf TELEPHONE 703-894-5151X2502 MONTH December DAY AVERAGE DAILY POWER LEVEL D' Y AVERAGE DAILY POWER LEVEL A
(MWe-Net)
(MWe-Net) 1 0
17 0
2 0
18 0
3 0
19 0
4 1
20 0
5 36 21 0
6 0
22 0
7 0
23 0
8 0
24 0
9 0
25 0
10 0
26 0
11 0
27 0
12 0
28 0
i 13 0
29 0
i i
14 0
30 0
15 0
31 0
16 0
INSTLUCTIONS On this format, list the average daily unit power level in MWe-Net for each day in the reporting month. Compute to the nearest whole megawatt.
OPERATING DATA REPORT DOCKET NO.
50-339 DATE 01-01-83 COMPLETED BY G. D. Schmitendorf TELEPHONE (703) 894-5151 X2502 OPERATING STATUS Notes 1.
Unit Name:
North Anna 2 2.
Reporting Period:
December 1982 3.
Licensed Thermal Power (MWt):
2775 4.
Nameplate Rating (Gross We):
947 5.
Design Electrical Rating (Net We):
907 6.
Maximum Dependable Capacity (Gross We):
939 7.
Maximum Dependable Capacity (Net We):
890 8.
If Changes Occur in Capacity Ratings (Items No. 3 thru 7) Since Last Report, Give Reasons:
NA 9.
Power Level To Which Restricted, If Any (Net We):
N/A
- 10. Reasons For Restrictions, If Any:
N/A This Month Yr.-to-Date Cumulative
- 11. Hours In Reporting Period 744 8,760 17,952 12.
Number of Heurs Reactor Was Critical 744 5,088.3 12,503.1
- 13. Reactor Reserve Shutdown Hours 0
388.6 2,021.8
- 14. Hours Generator On-Line 744 4,993.3 12,452.7
- 15. Unit Reserve Shutdown Hours 0
0 0
~
- 16. Gross Thermal Energy Generated (MWH) 1,992,521 12,943,179 31,726,020 17.
Gross Electrical Energy Generated (MWH) 650,354 4,280,064 10,589,296
- 18. Net Electrical Energy Generated (MWH) 615,639 4,047,202 10,049,618 l
- 19. Unit Service Factor 100.0 57.0 69.4 l
20.
Unit Availability Factor 100.0 57.0 69.4 21.
Unit Capacity Factor (Using MDC Net) 93.0 51.9 62.9
- 22. Unit Capacity Factor (Using DER Net) 91.2 50.9 61.7,
- 23. Unit Forced Outage Rate 0
22.5 20.0 24.
Shutdowns Scheduled Over Next 6 Months (Type, Date, and Duration of Each):
Refueling Outage 04-01-83 thru 05-15-83 l
1 1
25.
If Shut Down At End Of Report Period, Estimated Date of Startup:
l
- 26. Units In Test Status (Prior to Commercial Operation):
)
Forecast Achieved INITIAL CRITICALITY INITIAL ELECTRICITY l
COMMERCIAL OPERATION i
UNIT SHUTDOWNS AND POWER REDUCTIONS DOCKET NO.
50-339 UNIT NAME North Anna 2 DATE 01-01-83 REPORT MONTH December COMPLE Y
D. S het ndorf l
No.
Date Type Duration Reason Method of Licensee System Component Caus & Corrective (Hours)
Shutting vent Code Code
^*'I 3
4 5
Down Reactor Report #
Prevent Recurrence 1
82-21 821205 F
0 H
5 NA NA NA Load Reduction in order to l
reduce High Cation Conductiv-ity of the Steam Generator Chemistry.
82-22 821225 S
0 H
5 NA NA NA Load follow due to system load requirements as per System Operator.
82-23 821225 S
0 H
5 NA NA NA Load follow due to system load requirements as per System Operator.
l t
i l
1 2
3 4
F: Forced Reason:
Method:
Exhibit F - Instructions S: Scheduled A-Equipment Failure (Explain) 1-Manual for Preparation of Data B-Maintenance or Test 2-Manual Scrasa.
Entry Sheets for Licensee C-Refuelirg 3-Automatic Scram Event Report (LER) File D-Regulatory Restriction 4-Continuations (NUREG-0161)
E-Operator Training & License Examination 5-Load Reduction F-Administrative 9-Other 5
G-Operational Error (Explain)
H-Other (Explain)
Exhibit H - Same Source a
l o
Page 1
of 1
UNIT SHUTDOWN AND POWER REDUCTIONS EXPLANATION SHEET DOCKET NO.
50-339 REPORT HONTH December UNIT NAME NA-2 YEAR 1982 DATE 01-03-83 COMPLETED BY G. D. Schmitendorf 82-21 (H)
(5)
At 1050 on December 5,1982 with the Unit at 100% power a unit rampdown was commenced due to excessive Cation Conductivity in the Steam Generators. The unit was stabilized at 30%
power for the secondary chemistry hold at 1245. The chemistry hold was released at 0038 on December 6 and the unit stabilized at 100% power at 0550 on December 6, 1982.
82-22 (H)
(5)
At 0028 on December 25, 1982 with the Unit at 100% power a rampdown, to 850MW as per the System Operator, was commenced due to system load / voltage requirements. At 0119 on December 25 a further decrease in load as per the System Operator e.a commenced. The unit was stabilized at 500MW at 0329 on December 25.
At 0500 on December 25 a ramp-up in power as per the System Operator was commenced. The unit was stabilized at 100% power at 0908 on December 25, 1982.
82-23 (H)
(S)
At 2349 on December 25, 1982 with the Unit at 100% power a rampdown, as per the System Operator was commenced due to system load / voltage requirements. At 0145 on December 26, Quadrant i
Power Tilt Ratio calculations proved unsatisfactory reque ring a further reduction in power to less than 50%. The unit was stabilized at 30% power at 0229 on December 26.
At 0518 on December 26 a ramp-up in power as per the System Operator was commenced. The unit was stabilized at 100% power at 0955 on December 26, 1982.
/
1 1
0 AVERAGE DAILY UNIT POWER LEVEL DOCKET NO.
50-339 UNIT NA-2 DATE 01-01-83 COMPLETED BY G. Schmitendorf TELEPHONE 703-894-5151X2502 MONTH December DAY AVERAGE DAILY POWER LEVEL DAY AVERAGE DAILY POWER LEVEL (MWe-Net)
(MWe-Net) 1 494 17 862 2
858 18 856 3
862 19 863 4
858 20 861 5
536 21 857 6
772 22 862 7
857 23 862 8
858 24 860 9
859 25 782 10 860 26 714 11 859 27 862 12 863 28 861 13 863 29 862 14 862 30 859 l
15 851 31 856 l
16 862 INSTRUCTIONS On this fermat, list the average daily unit power level in MWe-Net for each day in the reporting month. Compute to the nearest whole megawatt.