ML20077H800
| ML20077H800 | |
| Person / Time | |
|---|---|
| Site: | North Anna  |
| Issue date: | 07/01/1983 |
| From: | Schmitendorf G, Stewart W VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.) |
| To: | Haller N NRC OFFICE OF RESOURCE MANAGEMENT (ORM) |
| References | |
| 406, NUDOCS 8308110315 | |
| Download: ML20077H800 (15) | |
Text
.
r
(
VIRGINIA ELECTRIC AND POWER COMPANY NORTH ANNA POWER STATION MONTHLY OPERATING REPORT MONTH June YEAR,1983 APPROVED:
STATION MANA p
j
\\
8308110315 830701 PDR ADOCK 05000338
(
R PDR
)
o OPERATING DATA REPORT DOCKET NO.
50-338 DATE 07-01-83 COMPLETED BY G. D. Schmitendorf TELEPHONE (703) 894-5151 X2117 OPERATING STATUS Notes 1.
Unit Name:
North Anna 1 2.
Reporting Period:
June 1983 3.
Licensed Thermal Power (MWt):
2775 4.
Nameplate Rating (Gross MWe):
947 5.
Design Electrical Rating (Net NWe):
907 6.
Maximum Dependable Capacity (Gross MWe):
930 7.
Maximum Dependable Capacity (Net MWe):
877 8.
If Changes Occur in Capacity Ratings (Items No. 3 thru 7) Since Last Report, Give Reasons:
MDC Gross and MDC Net changed to reflect increased secondary plant efficiency from MSR modifications.
9.
Power Level To Which Restricted, If Any (Net MWe):
N/A
- 10. Reasons For Restrictions, If Any:
N/A l
This Month Yr.-to-Date Cumulative 11.
Hours In Reporting Period 720 4,343 44,424 12.
Number of Hours Reactor Was Critical 706 2,651.6 29,774.6 13.
Reactor Reserve Shutdown Hours 14 1,691.4 2,945.5 14.
Hours Generator On-Line 703.2 2,501 28,883.2 15.
Unit Reserve Shutdown Hours 0
0 0
16.
Gross Thermal Energy Generated (MWH) 1,886,762 6,600,374 74,860,728 17.
Gross Electrical Energy Generated (MWH) 630,370 2,206,895 23,991,427 18.
Net Electrical Energy Generated (MWH) 597,997 2,091,984 22,612,717 19.
Unit Service Factor 97.7 57.6 65.0 20.
Unit Availability Factor 97.7 57.6 65.0 21.
Unit Capacity Factor (Using MDC Net) 94.7 54.9 58.0 22.
Unit Capacity Factor (Using DER Net) 91.6 53.1 56.1
- 23. Unit Forced Outage Rate 2.3 42.4 11.9 24.
Shutdowns Scheduled Over Next 6 Months (Type, Date, and Duration of Each):
Scheduled Maintenance, 10-07-83, 10 Days 25.
If Shut Down At End Of Report Period, Estimated Date of Startup:
26.
Units In Test Status (Prior to Commercial Operation):
Forecast Achieved INITIAL CRITICALITY INITIAL ELECTRICITY COMMERCIAL OPERATION w_
AVERAGE DAILY UNIT POWER LEVEL DOCKET NO.
50-338 UNIT NA-1 DATE 07-01-83 COMPLETED BY G. Schmitendorf TELEPHONE 703-894-5151X2117 MONTH June DAY AVERAGE DAILY POWER LEVEL DAY AVERAGE DAILY POWER LEVEL (MWe-Net)
(MWe-Net) 1 879 17 872 2
878 18 874 3
877 19 872 4
872 20 877 5
869 21 884 6
697 22 886 7
99 23 886 8
403 24 885 9
845 25 885 10 885 26 863 11 881 27 877 12 888 28 877 13 888 29 879 14 887 30 880 15 888 31 16 885 INSTRUCTIONS 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.
4
1
=
UNIT SHUTDOWNS AND POWER REDUCTIONS DOCKET NO.
50-338 UNIT NAME North Anna 1 DATE 07-01-83 I
REPORT MONTH June COMPLETED BY G. D. Schmitendorf l
1 TELEPHONE (703) 894-5151 X2502 l
2 No.
Date Type Duration Reason Method of Licensee System Component Cause & Corrective (Hours)
Shutting Code Action to 3
- 4 5
Down Reactor Report #
Prevent Recurrence i
83-04 830606 F
16.8 G
3 043 EB CKTBRK Vital Bus de-energized due to operator error during transfer of the Bus from inverter to the alternate source of power. The momentary loss of power resulted in a Turbine trip / reactor trip.
The Vital Bus was immediately energized from the alternate source of power. The unit was stabilized and then returned to normal power operations.
Personnel will be instructed, and the Abnormal Procedure associated with this situation revised; as to proper guidance in dealing with problems associated with transferring a Vital Bus.
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 G-Operational Error (Explain)
H-Other (Explain)
Exhibit H - Same Source
Page 1
of 1
UNIT SHUTDOWN AND POWER REDUCTIONS EXPLANATION SHEET DOCKET NO.
50-338 REPORT MONTH June UNIT NAME NA-1 YEAR 1983 DATE 07-01-83 COMPLETED BY G. D. Schmitendorf 83-04 (G)
(3)
At 1902 on 6 June, 1983 with the Unit at 100% power, Vital Bus 1-I was momentarily de-energized while transferring from the inverter (normal supply) to the SOLA transformer (alternate power supply).
The loss of the vital bus resulted in opening all eight condenser waterbox outlet trip valves with a subsequent tripping of all four circulating water pumps, a loss of vacuum, and a turbine / trip reactor trip.
Prior to the transfer it was observed that the interlock pin (used to indicate whether the inverter and SOLA transformer are in sync), was in the up position rather than the down position, which it must be in to allow the transfer to take place.
In order to defeat this interlock and allow the transfer of the vital bus from the inverter to the SOLA transformer, the alternate source AC input breaker was opened.
This allowed the interlock pin to drop down as the circuity no longer sensed an out of sync condition.
The power transfer switch was moved from the inverter to the SOLA transformer position and the alternate source AC input breaker immediately reclosed.
That action momentarily separated the Vital Bus 1-I from both the inverter and the SOLA transformer, thus de-energizing the vital bus for approximately two
- seconds, causing a
The Unit was stabilized in Mode 3 (Hot Standby) and necessary repairs to a blown rupture disc on Number 1 low pressure turbine commenced.
The repairs were completed to the secondary plant, and a reactor start-up commenced at 0630 on 7 June, 1983.
The Unit was placed on-line at 1151 on 7 June, 1983.
Personnel will be instructed, and the Abnormal Procedure associated with this situation revised as to proper guidance in dealing with this and other problems associated with transferring a vital bus from one source to another.
i l
l r
4 VIRGINIA ELECTRIC AND POWER COMPANY NORTH ANNA POWER STATION l
UNIT NO.
1 MONTH June
SUMMARY
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.
June 1, 1983 0000 This month begins with the unit stable at 100% power.
June 6, 1902 Reactor Trip. Loss of Vital Bus I while transferring from inverter to SOLA trans-A former supply; causing loss of all four main circulators (Turbine Trip / Reactor Trip).
June 7, 0630 Commenced Reactor Start-up.
]
0900 Reactor Critical.
I 1151 Generator on-line.
1500 Unit stabilized at 30% power for secondary chemistry hold.
June 8, 0519 Released from secondary chemistry hold.
Commenced increasing power.
June 9, 0920 Unit stab 4.11 zed at 100% power.
June ~30, 2400 This month ends with the unit stable at 100% power.
i
~
i I
1
AVERAGE DAILY UNIT POWER LEVEL DOCKET NO.
50-339 UNIT NA-2 DATE 07-01-83 COMPLETED BY G. Schmitendor TELEPHONE 703-894-5151X2117 MONTH June DAY AVERAGE DAILY POWER LEVEL DAY AVERAGE DAILY POWER LEVEL (MWe-Net)
(MWe-Net) 1 220 17 0
2 217 18 0
3 219 19 0-4 227 20 0
5 217 21 165 6
395 22 251 7
710 23 850 8
833 24 869 9
873 25 870 10 873 26 872 11 874 27 433 12 866 28 546 13 871 29 854 14 874 30 795 15 872 31 16 615 INSTRUCTIONS 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 07-01-83 COMPLETED BY G. D. Schmitendorf TELEPHONE (703) 894-5151 X2117 OPERATING STATUS Notes 1.
Unit Name:
North Anna 2 2.
Reporting Period:
June 1983 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):
939 7.
Maximum Dependable Capacity (Net MWe):
890 8.
If Changes-Occur in Capacity Ratings (Items No. 3 thru 7) Since Last Report, Give Reasons:
N/A 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 720 4,343 22,295 12.
Number of Hours Reactor Was Critical 618.5 2,770.0 15,273.1 13.
Reactor Reserve Shutdown Hours 101.5 1,746.5 3,000.6 14.
Hours Generator On-Line 601.3 2,697.3 15,150 l
15.
Unit Reserve Shutdown Hours 0
0 0
j 16.
Gross Thermal Energy Generated (MWH) 1,283,071 6,737,024 38,463,044 17.
Gross Electrical Energy Generated (MWH) 416,200 2,194,024 12,783,337
- 18. Net Electrical Energy Generated (MWH) 390,230 2,074,122 12,123,740
.19.
Unit Service Factor 83.5 62.1 68.0 i
20.
Unit Availability Factor 83.5 62.1 68.0 21.
Unit Capacity Factor (Using MDC Net) 60.9 53.7 61.1 22.
Unit Capacity Factor (Using DER Net) 59.8 52.7 60.0 23.
Unit Forced Outage Rate 16.5 9.0 18.2 24.
Shutdowns Scheduled Over Next 6 Months (Type, Date, and Duration of Each):
Scheduled Maintenance, 11-18-83, 10 Days
- 25. - If Shut Down At End Of Report Period, Estimated Date of Startup:
- 26. Units In Test Status (Prior to Commercial Operation):
Forecast Achieved INITIAL' CRITICALITY INITIAL ELECTRICITY COMMERCIAL OPERATION
UNIT SHUTDOWNS AND POWER REDUCTIONS DOCKET NO.
50-339 UNIT NAME Narth Anna 2 DATE 07-01-83 REPORT MONTH June 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 Event Code Code A* I "
3 4
5 Down Reactor Report #
Prevent Recurrence 83-09 830616 F
104.4 A
1 050 EE ENGINE "2J" Diesel Generator cooling water leak led to a cracked piston and cylinder sleeve.
Rampdown to off-line and cool-down to Mode 5 for repairs to diesel. Repairs were completed and diesel proved operable.
Unit returned to on-line.
83-10 830627 F
14.3 A
3 NA NA NA Main Generator voltage fluc-tuation resulted in a turbine /
reac.ar trip on generator 3
differential lockcut. Volt-age regulator inspected and no failures were discovered.
Unit returned to on-line.
Exact cause of regulator mal-function still under investi-gation.
83-11 830630 F
0 A
5 NA NA NA Unit rampdown to reduce generator leads temperatures, allowing replacement of worn bearings on the Generator Leads Cooling Fan. Repairs were made and the unit returned to full power.
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 i
D-Regulatory Restriction 4-Continuations (NUREG-0161)
E-Operator Training & License Examination 5-Load Reduction F-Administrative 9-Other G-Operational Error (Explain)
H-Other (Explain)
Exhibit H - Same Source
Page 1
of 2
UNIT SHUTDOWN AND POWER REDUCTIONS EXPLANATION SHEET DOCKET NO.
50-339 REPORT MONTH June UNIT NAME NA-2 YEAR 1983 DATE 07-01-83 COMPLETED BY G. D. Schmitendorf 83-09 (A)
(1)
At 1439 on June 16, 1983, with the unit at 100% power a unit rampdown to off-line was commenced due to "2J" Diesel Generator being declared inoperable. Subsequently the unit was place in Mode 5 (Cold Shutdown) at 0841 on June 17, 1983 in accordance with Technical Specifications while repairs to the diesel were made. Due to several unexplained trips of the "2J" diesel, it was decided to disassemble the diesel. It was discovered that cooling water was leaking into the crankcase through several gaskets (injector seals and upper crankshaft seals). The No. 3 upper piston and its associated cylinder sleeve were found to be cracked. The cracked piston and cylinder sleeve were attributed to the inleakage of cooling water. The "2J" Diesel Generator was repaired and tested for cooling water leakage following re-assembly with satis-factory results.
The diesel was subsequently tested, proved operable and returned to service at 0212 on June 20, 1983. The Unit was returned to on-line at 0334 on June 21, 1983.
83-10 (A)
(3)
At 1155 on June 27, 1983, with Unit at 100% power, Main Generator voltage fluctuations resulted in a Turbine trip on generator differential lockout and subsequent reactor trip. The trip was due to a malfunction of the Main Generator voltage regulator. The voltage regulator was inspected with no failures within the voltage regulator circuitry discovered. The exact cause of the voltage regulator malfunction is still being investigated. The unit was stabilized and a start-up commenced at 1447 on 27 June, 1983. A reactor trip due to a turbine first stage pressure spike occurred during the recovery but prior to placing the unit on line. The start-up was recommenced at 2239 on 27 June, 1983 with the unit placed on-line at 0213 on 28 June, 1983.
Page 2 of 2 83-11 (A)
(5)
At 1127 on June 30, 1983, a Unit rampdown w5s commenced to approximately 60% power in order to maintain the Main Generator leads bus duct temperatures within limits while worn bearings were replaced in the generator leads cooling fan. The Unit was stabilized at 64% power in preparation for making the repairs. During the period that repair work was performed the bus duct temperatures (monitored locally) and all other generator parameters, were closely monitored.
All parameters were well within limits allowed and a ramp-up to 100% power was commenced at 1504 on 30 June, 1983.
The Unit reached 100% power at 1830 on 30 June, 1893.
Final alignment and adjustments were made to the fan and its associated motors. The Generator Leads Cooling Fan was tested, proved satisfactory, and returned to service.
L.
4 VIRGINIA ELECTRIC AND POWER COMPANY NORTH ANNA POWER STATION UNIT NO.
2 MONTH June
SUMMARY
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.
June 1, 1983 0000 This month begins with the unit stable at 30% power and holding due to secondary chemistry.
June 6, 0035 Released from chemistry hold.
Commenced increasing power.
0840 Stabilized at 50% power for Turbine vibration readings.
1017 Placed in secondary chemistry hold 1648 Released from secondary chemistry hold.
Commenced increasing power.
2235 Stabilized at 68% power (610 MW) for secondary chemistry hold.
June 7, 0050 Released from secondary chemistry hold.
Commenced increasing power.
0740 "A" main feedwater regulating valve failed to approximately the 50% open position.
Bypass regulating valve was fully opened and main feedwater regulating valve manually over-ridden. The Unit was ramped down to approxi-i mately 75% power during the transient.
0800 The cause of the main feedwater regulating valve failure was attributed to dirt found in the control air system. The valve was tested and operated properly.
Commenced iacreasing power.
June 8, 2100 Unit stabilized at 100% power.
l
- ~.
+
e'.
June 16, 1439 Commenced Unit rampdown to off-line and cooldown to Mode 5 (Cold Shutdown) due to "2J" Diesel being declared inoperable.
Cooling water leakage into crankcase resulted in a cracked piston a,nd cylinder sleeve.
1929 Generator off-line.
1958 Commenced Reactor Shutdown.
June 17, 0841 Entered Mode 5 (Cold Shutdown).
June 20, 0238 Commenced heat-up. Repairs completed and diesel generator proved operable.
1929 Commenced Reactor Start-up.
1958 Reactor Critical.
June 21, 0344 Generator on-line.
0440 Unit stabilized at 30% power for secondary chemistry hold.
June 22, 1841 Released from chemistry hold.
Commenced increasing power.
2010 Stabilizing at 50% power for Turbine Vibration readings.
2129 Commence increasing power to 75%.
2320 Stabilized at 75% power for Turbine Vibrations readings.
June 23, 0015 Commenced increasing power to 100%.
0430 Unit stabilized at 100% power.
June 27 1155 Reactor Trip. Voltage regulator malfunction caused generator / turbine / reactor trip. The exact cause of the generator excitatica problem is still under investigation.
1447 Commenced Reactor Start-up.
1513 Reactor Critical.
2239 Reactor Trip. The trip was due to a First Stage Pressure spike. Re-commenced Reactor Start-up.
2
June 28, 0058 Reactor Critical.
0213 Generator on-line.
4 0320 Stabilized at 30% power for secondary chemistry hold.
~
0748 Released from secondary chemistry hold.
Commenced increasing power.
1413 Unit stabilized at 100% power.
June 30, 1127 Commenced unit rampdown to approximately 60% power in order to maintain generator leads bus duct temperatures within limits while worn bearings are replaced in the Generator Leads Cooling Fan. The bus duct cooling temperatures were monitored locally.
4 1307 Unit stabilized at 64% power.
1442 Commenced increasing power to 68%. Elec-tricians monitoring bus duct temperature.
1500 Unit stabilized at 68% power. Bus duct and generator data further analyzed.
1504 Commenced increasing power to 100%. Bus i
duct temperatures to be monitored by electrical department while work continues on Generator Leads Cooling Fan.
1830 Unit stable at 100% power.
2400 This month ends with the unit stable at 100% power. Final alignment / adjustments are in progress on the Generator Leads Cooling Fan / Motor.
3
r VinGINIA ELECTHIC AND PowEn COMPANY RicnwoNn,VIMOINIA 23261 w.L.sr=waar
' Vse. P..eins.T woes.... o..
July 14, 1983 Mr. N..M.
Haller, Director Serial No. 406 Office of~ Management and Program Analysis N0/JHL:acm U. S. Nuclear Regulatory Commission Docket Nos. 50-338 Washington, D.-C.
20555 50-339 License Nos. NPF-4 NPF-7
Dear Mr. Haller:
Enclosed is the Monthly Operating Report for North Anna Power Station Unit Nos. I and 2 for-the month of June, 1983, ry truly yours, r
w V. W
%(
W. L. Stewart Enclosure (3 copies) cc:
Mr. R. C. DeYoung, Director (12 copies)
Office of Inspection and Enforcement Mr._-James P. O'Reilly (1 copy)
Regional Administrator Region 11
.Mr. M.;B. Shymlock' NRC Resident Inspector North Anna Power Station 4
ll:
t:
1