ML20211H016

Monthly Operating Repts for Mar 1986

ML20211H016
Person / Time
Site:	Diablo Canyon
Issue date:	03/31/1986
From:	Keller A, Sisk D, Thornberry R PACIFIC GAS & ELECTRIC CO., ROCHESTER GAS & ELECTRIC CORP.
To:	NRC OFFICE OF RESOURCE MANAGEMENT (ORM)
References
DC0455, DC455, NUDOCS 8606230003
Download: ML20211H016 (10)

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" MONTHLY NARRATIVE REPORT 0F OPERATION AND MAJOR MAINTENANCE EXPERIENCE This report describes the operating and major maintenance experience for the month of March, 1986. This narrative report was prepared by the plant staff and is submitted in accordance with Section 6.9.1.7 of the Units 1 and 2 Technical Specifications.

On March 1, 1986 At 1020 PST, Unit 2 began 100 hour0.00116 days <br />0.0278 hours <br />1.653439e-4 weeks <br />3.805e-5 months <br /> warranty run.

On March 4, 1986 Unit I ramped down to 50% to plug leaking tubes in the main condenser.

On March 5, 1986 Unit I returned to 100% power.

On March 5, 1986 Unit 2 successfully completed 100-hour warranty run at 1420 PST.

On March 5, 1986 Unit 2 experienced a reactor trip.

On March 7, 1986 Unit 2 paralleled to the grid.

On March 7, 1986 Unit I ramped down to 37% power for demusseling.

On March 9, 1986 Unit I returned to 100% power.

On March 10, 1986 Unit 2 ramped down to 46% power to plug leaking tubes in the main condenser and returned to 99% power.

On March 11, 1986 Unit 2 ramped down to 51% power to plug leaking tubes in the main condenser and returned to 100% power.

On March 11, 1986 Unit 2 experienced a reactor trip during full load (100%)

rejection test.

On March 12, 1986 Unit 2 paralleled to the grid.

On March 13, 1986 Unit 2 was declared to be in " commercial operation" at 0300 PST.

On March 14, 1986 Unit 1 experienced a reactor trip and 2 safety injections after being on line 96 consecutive days.

On March 14, 1986 Unit 2 experienced a spurious containment ventilation isolation.

On March 16, 1986 Unit 1 paralleled to the grid.

On March _26, 1986 Unit I ramped down to 50% power to plug leaking tubes in the main condenser.

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On March 27, 1986 Unit I raturned to 100% power.

On March 29, 1986 Unit 2 ramped down to 49% to plug leaking tubes in the main condenser.

On March 30, 1986 A manual unit trip was initiated on Unit 2 following a main condenser tube rupture. A steam dump valve failed open resulting in a high steam flow coincident with Low-Low Tavg safety injection.

On March 30, 1986 Unit I ramped down to 55% power to plug leaking tubes in the main condenser.

On March 31, 1986 Unit 1 returned to 100% power.

Unit 1 operated this month with a unit availability factor of 92.3% and a unit capacity factor of 84.6%.

During the month of March, Unit I had to reduce power four times; three to plug leaking tubes in the main condenser and once for demusseling. In addition, Unit 1 experienced a safety injection / reactor trip after 96 consecutive days on line.

Unit 2 was declared in commercia! operation at 0300 PST, March 13. Since being

in commercial operation, Unit 2 has operated with a unit availability factor of

! 90.1% and a unit capacity factor of 89.1%.

During the month of March, Unit 2 had to reduce power three times to plug leaking main condenser tubes. In addition, Unit 2 experienced two automatic reactor trips, once during a full load rejection test and once due to a rod control system malfunction which caused two rods to drop. Also Unit 2 experienced a manually initiated unit trip following a main condenser tube rupture. A steam dump valve failed open during the transient following the unit trip resulting in a high steam flow coincident with Low-Low Tavg safety injection.

No challenges to the steam generator safety valves or pressurizer power operated relief valves have been made. No major safety-related maintenance was performed on Unit I during the month of March. For Unit 2, an outboard pump seal ring was 4

replaced on charging pump 2-2.

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OPERATING DATA REPORT DOCKET NO. 50-275 DATE 04/01/86 COMPLETED BY A.T. Keller TELEPHONE (805)595-7351 OPERATING STATUS

1. Unit Name: Diablo Canyon Unit 1

2. Reporting Period: March 1986

3. Licensed Thermal Power (MWt): 3338

4. Nameplate Rating (Gross MWe): 1137

5. Design Electrical Rating (Net MWe): 1086

6. Maximum Dependable Capacity (Gross MWe): 1125

7. Maximum Dependable Capacity (Net MWe): 1073

8. If Changes Occur in Capacity Ratings (Items Number 3 Through 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: None This Month Yr-to-Date Cumulative *

11. Hours In Reporting Period 744.0 2160.0 7894.3

12. Number Of Hours Reactor Was Critical 712.5 2128.5 7426.8

13. Reactor Reserve Shutdown Hours 0.0 0.0 0.0

14. Hours Generator On-Line 687.0 2103.0 7310.3

15. Unit Reserve Shutdown Hours 0.0 0.0 0.0

16. Gross Thermal Energy Generated (MWH) 2132185 6658705 23224160

17. Gross Electrical Energy Generated (MWH) 712300 2206600 7720932

18. Net Electrical Energy Generated (MWH) 675636 2096950 7331184

19. Unit Service Factor 92.3 97.4 92.6

20. Unit Availability Factor 92.3 97.4 92.6

21. Unit Capacity Factor (Using MDC Net) 84.6 90.5 86.5

22. Unit Capacity Factor (Using DER Net) 83.6 89.4 85.5

23. Unit Forced Outage Rate 7.7 2.6 7.4

24. Shutdowns Scheduled Over Next 6 Months (Type, Date, and Duration of Each):

Refueling Outage, August 30, 1986, 68 days

] 25. If Shut Down At End Of Report Period, Est. Date of Start-up: N/A i 26. Units In Test Status (Prior to Commercial Operation): N/A

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j o As of commercial operation on 5-7-85 at 0243.

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OPERATING DATA REPORT DOCKET N0. 50-323 DATE 04/01/86 COMPLETED BY A.T. Keller TELEPHONE (805)595-7351 OPERATING STATUS

1. Unit Name: Diablo Canyon Unit 2

2. Reporting Period: March 1986

3. Licensed Thermal Power (MWt): 3411

4. Nameplate Rating (Gross MWe): 1164

5. Design Electrical Rating (Net MWe): 1119

6. Maximum Dependable Capacity (Gross MWe): 1145**

7. Maximum Dependable Capacity (Net MWe): 1093**

8. If Changes Occur in Capacity Ratings (Items Number 3 Through 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: None  ;

This Month

• Yr-to-Date* Cumulative *

11. Hours In Reporting Feriod 453.0 453.0 453.0

12. Number Of Hours Reactor Was Critical 408.0 408.0 408.0

13. Reactor Reserve Shutdown Hours 0.0 0.0 0.0

14. Hours Generator On-Line 408.0 408.0 408.0

15. Unit Reserve Shutdown Hours 0.0 0.0 0.0

16. Gross Thermal Energy Generated (MWH) 1372940 1372940 1372940

17. Gross Electrical Energy Generated (MWH) 456399 456399 456399

18. Net Electrical Energy Generated (MWH) 433201 433201 433201

19. Unit Service Factor 90.1 90.1 90.1

20. Unit Availability Factor 90.1 90.1

21. Unit Capacity Factor (Using MDC Net) 89.1 89.1

22. Unit Capacity Factor (Using DER Net) 85.5 85.5

23. Unit Forced Outage Rate 9.9 9.9

24. Shutdowns Scheduled Over Next 6 Months (Type, Date, and Duration of Each):

N/A

. 25. If Shut Down At End Of Report Period, Est. Date of Start-up: April 2, 1986

26. Units In Test Status (Prior to Commercial Operation): N/A o Monthly, year-to-date, and cumulative totals started March 13,1986 at 0300 PST (Date of commercial operation) 00 These values are predictions - actual values are to be determined by operating experience during the first year of commercial operation.

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AVERAGE DAILY UNIT POWER LEVEL ' .- .

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DOCKET NO. 50-275 UNIT Diablo Canyon Unit 1 DATE 04/01/86

-COMPLETED BY A.T. Keller TELEPHONE (805)595-7351 MONTH March 1986 DAY AVERAGE DAILY POWER LEVEL DAY AVER'GE A DAILY POWER LEVEL (MWe-Net) (MWe-het) 1 1087 17 580 2 1067 18 1078 3 1083 19 1074 4 1047 20 1082 5 840 '21 1078 -

. 6 1083 22 1078 7 1001 23 1061-8 462 24 1078 9 1037 25 1078' 10 1087 26 561 11 1086 27, 804' (

12 1077 28 1079 13 1086 29 .1078 14- 638 30 778 15 -36 31 1062

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16 -46' INSTRUCTIONS ,

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- On this format, list the average daily unit power Jevef:in MWe-Net for.each day 'in the reporting month. Compute to the nearest whole megawatt.

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AVERAGE' DAILY UNIT POWER LEVEL

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DOCKET N0. 50-323 UNIT Diablo Canyon Unit 2 04/01/86 DATE COMPLETED BY A.T. Keller TELEPHONE (805)595-7351

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MONTH March 1986 DAY AVERAGE DAILY POWER LEVEL DAY AVERAGE DAILY POWER LEVEL (MWe-Net) (MWe-Net) 1 1027 17 1087 2 1069 18 1088 3 1069 19 -1088 4 1077 20 1097 5 752 21 1093 6 -38 22 1092 l 7 -21 23 1061 8 900 24 1090 9 1089 25 1085 10 800 26 1085 11 756 ,_

27 1081 12 75 28 1089 13 1079 29 848 4

14 1088 30 21 i

15 1082 31 -29 1

16 1061 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.

DC0455

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UNIT SHUTDOWNS

'Page 1 of 1 DOCKET N0. 50-275 -

UNIT NAME' Diablo Canyon Unit 1 DATE 04/02/86 * '

COMPLETED BY D.P. SISK i

REPORT MONTH MARCH 1986 TELEPHONE (805)595-7351 Licensee ause & Corrective >

. Method of System Component Event Action to Type l ' Duration t 2 3 4 5 No. Date (Hours) Reason Shutdown Report # Code Code Prevent Recurrence-i 1 03/14/86 F 57.0 A 3 1-86-004 JI IMOD At 1428 PST on March 14, a failed steam dump control module in conjunction with t a'100 megawatt load reduction while '

changing main turbine control modes resulted in a high steam flow in conjunction with low steam line .

4 pressure safety injection. At 1556 PST :

on the same day, the steam dump was reset. Immediately, the failed steam dump control module. caused the main condenser steam dumps to open for

^ approximately one second producing a high steam flow signal, that in

~ conjuction with a Low-Low Tavg, resulted in a second safety injection (high steam flow in conjunction with Low-Low Tavg). The failed control module was replaced.

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1 2 3 4 F: Forced Reason: Method: Exhibit G - Instructions i 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-Continuation from (NUREG-1022) 1 E-Operator Training & License Examination previous month J F-Administrative 5-Power reduction 5 G-Operational Error (Explain) 6,7,8-N/A Exhibit I - Same Source

. H-Other(Explain) 9-Other

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UNIT SHUTDOWNS Page 1 of 2 DOCKET NO. 50-323 -

UNIT NAME Diablo Canyon Unit 2

'DATE 04/03/86 -

COMPLETED BY D.P. SISK  !

REPORT MONTH MARCH 1986 TELEPHONE (805)S95-7351 Method of Licensee System Component Cause & Corrective Action to Duration 2 3 Event 4 5 No. Date Type l (Hours) Reason Shutdown Report # Code Code Prevent Recurrence 1 03/05/86 F 52.4 A 3 2-86-007 AA R0D While investigating a rod control '

urgent failure alarm, two rods from control bank D dropped causing a NIS ,

negative rate trip signal and i subsequent reactor trip. The dropped 1 rods were. caused by a failed logic  ;

module. The failed logic module was .

replaced.

2 03/11/86 S 15.8 B 1 2-86-008 JC NA The Unit was removed from the grid as

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i part of the full load rejection test.

. A reactor trip resulted from the NIS 3

negative rate signal exceeding the trip-setpoint. The NIS negative rate trip

setpoint was found to be too i conservative. The NIS trip s'etpoint l

will be reset in accordance with the

latestWespinghouserecommendation.

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i. I 2 3 4 j F: Forced . Reason: Method: Exhibit G - Instructions j S: Scheduled A-Equipment Failure (Explain) 1-Manual for Preparation of Data

.. B-Maintenance or Test 2-Manual Scram Entry Sheets for Licensee j C-Refueling 3-Automatic Scram Event Report (LER) File

D-Regulatory Restriction 4-Continuation from (NUREG-1022)

E-Operator Training & License Examination previous month F-Administrative 5-Power reduction 5 G-Operational Error (Explain) 6,7,8-N/A Exhibit I - Same Source H-Other(Explain) '9-Other DC0455

UNIT SHUTDOWNS Page 2 of 2 DOCKET N0. 50-323 a UNIT NAME Diablo Canyrn Unit-2 ,

DATE 04/03/86 .

COMPLETED BY D.P. SISK ' '

REPORT MONTH MARCH 1986 TELEPHONE (805)595-7351 i

Method of Licensee System Component Cause & Corrective Action to 1 Duration 2 3 Event 4 5 i No. Date Type l (Hours) Reason Shutdown Report # Code Code Prevent Recurrence

! 3 03/30/86 F 45.0 A 2 2-86-011 SG COND A manual unit trip was initiated in accordance with Operating Procedure AP-20 " Condenser Tube Leak" following a main condenser tube rupture. The ruptured tube was plugged and the main

condenser condensate hot well drained and refilled.

A steam dump valve failed open during the transient following the unit trip resulting in a high steam flow coincident with Low-Low Tavg safety injection.

1 2- 3 4 F: Forced Reason: Method: Exhibit G - Instructtuns 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-Continuation from (NUREG-1022)

E-Operator Training & License Examination previous month i F-Administrative 5-Power reduction 5 G-Operational Error (Explain) 6,7,8-N/A Exhibit I - Same Source H-Other(Explain) 9-Other DC0455

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4 PACIFIC OAS AND E LE C T RIC C O M PANY pgg , DIABLO CANYON POWER PLANT 4 RO. Box 56 Avila Beach, Califomia 93424 - (805) 595-7351 R.C. THORNBERRY PLANT MANAGER April 7, 1986 Director, Office of Resource Management U.S. Nuclear Regulatory Commission Washington, DC 20555 RE: Docket No. 50-275 and 50-323 License No. DPR-80 and DPR-82 Monthly Operating Report for March,1986 Gentlemen:

Enclosed are the completed monthly operating report forms for Diablo Canyon Units 1 and 2 for March,1986. This report is submitted in accordance with Section 6.9.1.7 of the Units 1 and 2 Technical Specifications.

Sincerely, W0f ROBERT C. THORNBERRY RCT: lam Enclosures cc Mr. John B. Martin, Regional Administrator Region V - USNRC I

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