ML20212G712

Monthly Operating Repts for Dec 1986

ML20212G712
Person / Time
Site:	Diablo Canyon
Issue date:	12/31/1986
From:	Keller A, Thornberry R PACIFIC GAS & ELECTRIC CO.
To:	NRC OFFICE OF ADMINISTRATION (ADM)
References
NUDOCS 8701210139
Download: ML20212G712 (9)

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MONTHLY NARRATIVE REPORT OF OPERATION AND MAJOR MAINTENANCE EXPERIENCE This report describes the operating and taajor maintenance experience for-tie month of December,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 December 1, 1986 Unit I started the month shutdown in its first refueling outage. Unit 2 started the month at full power.

On December 3, 1986 Unit 2 reduced power to 50% to search for leaking condenser tubes.

On December 4, 1986 Unit 2 returned to full power.

On December 5, 1986 Unit 2 reduced power to 50% to search for leaking condenser tubes.

On December 6, 1986 Unit 2 returned to full power.

On December 9, 1986 Unit 1 entered Mode 4.

@ December 11, 1986 Unit 1 entered Mode 3.

On December 12, 1986 Unit 2 reduced power to 50% to search for leaking condenser tubes.

On December 13, 1986 Unit 2 returned to full power after plugging leaking condenser tubes.

On December 20, 1986 Unit 1 entered Mode 2.

On December 27, 1986 Unit 1 entered Mode 1.

On December 28, 1986 During the Unit 1 startup a reactor trip resulted i from a steam flow /feedwater flow mismatch l

coincident with a low steam generator level.

While stabilizing the plant, Unit 1 experienced a second reactor trip due to low-low steam generator level.

On December 29, 1986 Unit I synchronized to the PGandE system. Unit 2 reduced power to 50% to search for leaking l condenser tubes and later returned to 85% power l

which was the maximum power level that could be achieved without incurring tube leakage.

On December 31, 1986 Unit 1 ended the month at 30% while performing startup tests. Unit 2 ended the month with power at 85%.

8701210139 861231 DR ADOCK 0500 5 7

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Unit I completed its first refueling outage which started August 29. On December 28, while disconnected from the PGandE system and at apprcximately 7% reactor power for turbine balancing, Unit 1 experienced a reactor trip.

During return to Mode 3 the turbine generator governor valves were closed.

Closing of the turbine generator governor valves lead to an increase in steam generator pressure. The increase in steam generator pressure caused one steam generator level to decrease to the low steam generator level trip setpoint. Also at this time, the 10 percent steam generator dump valves opened intermittently due to increasing steam generator pressure. The resulting change in steam flow through the steam dump system resulted in a momentary steam flow / feed flow mismatch signal. The low steam generator level in coincidence with the steam flow / feed flow mismatch caused a reactor trip.

While stabilizing the plant after the reactor trip, the reactor trip breakers were closed to allow latching of the turbine generator. Latching of the barbine generator allows the turbine generator stop pilot valves to close. Closing of the piloi valves therefore reduces the plant cooldown rate. During plant stabilization a low-low steam generator level reactor trip signal occurred, opening the reactor trip breakers. The Unit was not critical during the second reactor trip.

Unit I was synchronized to the PGandE system on December 29.

The Unit 1 monthly availability factor was 5.8% and the capacity factor was 0.0%.

Unit 2 operated this month with a unit availability factor of 100% and a unit capacity factor of 93.8%. Unit 2 reduced power 4 times this month. I time to search and plug leaking tubes and 3 additional times to search for leaking tubes.

No challenges to the steam generator safety valves or pressurizer power operated relief valves have been made. Significant Unit 1 safety related maintenance consisted of snubber washer inspections and the replacement of detectors NE-51 and N-42. Unit 2 safety related maintenance consisted of a seal replacement on centrifugal charging pump 2-2.

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OPERATING DATA REPORT DOCKET N0. 50-275 DATE 01/05/87 COMPLETED BY A.T. Keller TELEPHONE (805)595-7351 OPERATING STATUS

1. Unit Name: Diablo Canyon Unit 1

2. Reporting Period: December 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 1

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 Period 744.0 8760.0 14494.3

12. Number Of Hours Reactor Was Critical 227.0 5967.4 11265.7

13. Reactor Reserve Shutdown Hours 0.0 0.0 0.0

14. Hours Generator On-Line 43.3 5758.2 10965.4

15. Unit Reserve Shutdown Hours 0.0 0.0 0.0

16. Gross Thermal Energy Generated (MWH) 48788 16976617 33542069

17. Gross Electrical Energy Generated (MWH) 11200 5619400 11133732

18. Het Electrical Energy Generated (MWH) -10482 ** 5293477 *'10527811

19. Unit Service Factor 5.8 65.7 75.7

20. Unit Availability Factor 5.8 65.7 75.7

21. Unit Capacity Factor (Using MDC Net) 0.0 56.3 67.7

22. Unit Capacity Factor (Using DER Net) 0.0 55.6 ff

23. Unit Forced Outage Rate 12.6 1.1 6.1

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: N/A

26. Units In Test Status (Prior to Commercial Operation): N/A

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

• 8 - 1 time correction of +10 MW hrs. missed in April 1986.

• • - 1 time correction of +100 MW hrs. missed in July 1985.

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DPERATING DATA REPORT DOCKET NO. 50-323 DATE 01/05/87 COMPLETED BY A.T. Keller TELEPHONE (805)S95-7351 OPERATING STATUS

1. Unit Name: Diablo Canyon Unit 2

2. Reporting Period: December 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): 1130

7. Maximum Dependable Capacity (Net MWe): '1079

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 Period 744.0 7053.0 7053.0

12. ' Number Of Hours Reactor Was Critical 744.0 6857.0 6857.0

13. Reactor Reserve Shutdown Hours 0.0 0.0 0.0

14. Hours Generator On-Line 744.0 6730.4 6730.4

15. Unit Reserve Shutdosn Hours 0.0 0.0 0.0

16. Gross Thermal Energy Generated (MWH) 2399835 21080719 21080719

17. Gross Electrical Energy Generated (MWH) 794100 6912499 6912499

18. Net Electrical Energy Generated (MWH) 753397 6548174 6548174

19. Unit Service factor 100.0 95.4 95.4

20. Unit Availability Factor 100.0 95.4 95.4

21. Unit Capacity factor (Using MDC Net) 93.8 86.0 86.0

22. Unit Capacity Factor (Using DER Net) 90.5 83.0 83.0

23. Unit Forced Outage Rate 0.0 4.6 4.6

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

Unit 2 Refueling Outage, April 1, 1987, 10 weeks

25. If Shut Down At End Of Report Period, Est. Date of Start-up: N/A

26. Units In Test Status (Prior to Commercial Operation): N/A

• Year-to-date, and cumulative totals started March 13, 1986 at 0300 PST (Date of commercial operation)

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AVERAGE DAILY UNIT POWER LEVEL DOCKET N0. 50-275 UNIT Diablo Canyon Unit 1 DATE _0_1/05/87 COMPLETED BY A.T. Keller TELEPHONE (805)S95-7351 MONTH December 1986 DAY AVERAGE DAILY POWER LEVEL DAY AVERAGE DAILY POWER LEVEL (We-Net) (We-Net) 1 -12 17 -37 2 -13 18 -37 3 -12 19 -36 4 -13 20 -34 5 -16 21 -34

-9 6 22 -34 7 -21 23 -35 8 -25 24 -36 9 -29 25 -38 10 -25 26 -36 11 -33 27 -34 12 -34 28 -26 _

13 -35 29 -25 14 -37 30 124 15 -37 31 267 16 -37 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.

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AVERAGE DAILY UNIT POWER LEVEL DOCKET NO. 50-323 UNIT Diablo Canyon Unit 2 DATE 01/05/87 COMPLETED BY A.T. Keller TELEPHONE (805)S95-7351 MONTH December 1986 DAY AVERAGE DAIL'I POWER LEVEL DAY AVERAGE DAILY POWER LEVEL (We-Net) (We-Net) 1 1083 17 1086 __

2 1082 18 1087 3 991 19 1084 4 918 20 1083 5 1004 21 1017 ,

6 582 22 1087 7 1083 23 1087 8 1087 24 1083 9 1092 25 1083 10 1083 26 1083 11 1079 27 1084 12 1004 28 1044 13 709 29 771 14 1083 30 815 15 1087 31 850 16 1083 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.

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UNIT SHUTDOWNS .

P ge 1 cf I DOCKET NO. 50-275 UNIT NAME Diablo Cartyon Unit 1 DATE 01/05/87 -

COMPLETED BY M.T. HUG REPORT MONTH DECUEER 1986 TELEPHONE (805)S95-7351 Method of cense System Component Duration Event Action to No. Date Type l (Hours) Reason 2 Shutdown3 Report i Code 4

Code 5

Prevent Recurrence 1 8/29/86 S 700.7 C 4 N/A N/A N/A Diablo Canyon Unit I completed its first refueling outage which ended on December 29, 1986.

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1 2 3 4 F: Forced Reason: Method: Exhibit G - Instructions 1 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 F-Administrative 5-Power reduction 5 G-Operational Error (Explain) 6,7,8-M/A Exhibit I - Same Source

H-Other (Explain) 9-Other MO.RPT

s UNIT SHUTDOWS -

Page 1 of 1 DOCKET No. 50-323

. UNIT NAE Diablo Canyon Unit ?

DATE 01/05/87 COWLETED BY M.T. HUG REPORT MONTH DECEMER 1986 TELEPHONE (805)S95-7351 Method of censee System Component ause & Corrective Duration Event Action to 2 4 5 No. Date Type l (Hours) Reason Shutdown 3 Report i Code Code Prevent Recurrence None 1

.I t

1 2 3 4 i

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 i 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 j G-Operational Error (Explain) 6,7,8-N/A Exhibit 1 - Same Source j H-Other(Explain) 9-Other -

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i PACIFIC GAS AND E LE C T RIC C O M PANY i

, OlABLO CANYON POWER PLANT

[gglllllllj i PO. Box 56. Avila Beach, Cahfornia 93424 * (805) 595-7351 l

RC.THORNBERRY PLANT MANAGER January 13, 1987 1

U.S. Nuclear Regulatory Commission Attn: Document Control Desk Washington, DC 20555 RE: Docket No. 50-275 and 50-323 License No. DPR-80 and DPR-82 Monthly Operating Report for December,1986 Gentlemen:

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

Sincerely,

$0f ROBERT C. THORNBERRY b

RCT:lm Enclosures cc Mr. John B. Martin, Regional Administrator Region V - USNRC l

/$

DC0455 i