ML20207C766

Monthly Operating Repts for Apr 1986

ML20207C766
Person / Time
Site:	Diablo Canyon
Issue date:	04/30/1986
From:	Keller A, Thornberry R PACIFIC GAS & ELECTRIC CO.
To:	NRC OFFICE OF RESOURCE MANAGEMENT (ORM)
References
DC0455, DC455, NUDOCS 8607210431
Download: ML20207C766 (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 April,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 April 1, 1986 Unit 1 entered the month in Mode 1 (Power Operation) and Unit 2 entered the month in Mode 3 (Hot Standby).

On April 2, 1986 Unit 2 was synchronized to the PGandE system but stayed at reduced power while plugging leaking main condenser tubes.

On April 3, 1986 Unit 2 returned to 100 percent power.

On April 4, 1986 Unit I reduced power to 70 percent to perform a surveillance on f'.ow control valve FCV-44 (Main Steam Isolation Valve).

On April 5, 1986 Unit 1 returned to 100 percent power.

On April 6, 1986 Unit 2 reduced power to 50 percent to plug leaking main condenser tubes and returned to 100 percent power.

On April 9, 1986 Unit 2 experienced a reactor trip.

On April 10, 1986 Unit 2 was synchronized to the PGandE system but the power increase was stopped at 48 percent due to ongoing repairs of main feedwater pump 2-1.

On April 11, 1986 Unit 2 returned to 100 percent power.

On April 12, 1986 Unit 2 reduced power to 78 percent to facilitate repair to heater drain tank pump.

On April 13, 1986 Unit 2 reduced power to 30 percent to plug leaking main condenser tubes.

On April 15, 1986 Unit 2 returned to 100 percent power.

On April 17, 1986 Unit 2 reduced power to 49 percent due to an inoperable NIS channel.

On April 18, 1986 A Unit 2 Unusual Event was declared upon initiation of a plant shutdown when a NIS channel could not be repaired within the time limits of the Technical Specification Action Statement.

On April 18, 1986 Unit 2 returned to 100 percent power.

72 0431 860430 R DOCK 05000g79 \,

PDR ,

DC0455 a

Unit 1 operated this month with a unit availability factor of 100 percent and unit capacity factor of 100 percent. During the month of April, Unit I had to reduce power once to perform a post maintenance surveillance on a main steam isolation valve.

Unit 2 operated this month with a unit availability factor of 92.5 percent and a unit capacity factor of 83.2 percent. During the month of April, Unit 2 had to reduce power four times; twice to plug leaking main condenser tubes, once for maintenance, and once to meet a Technical Specification limitation. In addition, Unit 2 experienced an automatic reactor trip due to a transient initiated by a failed main feedwater pump thrust bearing wear detector probe.

No challenges to the steam generator safety valves or pressurizer power operated relief valves have been made. Major maintenance performed included the repair of Unit 2's number 2 Heater Drain Pump inboard bearing and the repair of a valve stem leak on Unit l's Main Steam Isolation Valve FCV-44.

DC0455

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i OPERATING DATA REPORT l

DOCKET NO. 50-275 i DATE 05/01/86

COMPLETED BY A.T. Keller l

TELEPHONE (805)595-7351 i OPERATING STATUS J

1. Unit Name: Diablo Canyon Unit 1 l 2. Reporting Period: A)ril 1986

3. Licensed Thermal Power (MWt): 3338 i 4. Narieplate Rating (Gross MWe): 1137 I

5. Design Electrical Rating (Net MWe): 1086 i

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, e

Give Reasons:

! N/A

9. Power Level To Which Restricted, If Any (Net MWe): N/A

10. Reasons For Restrictions, If Any

None i

This Month Yr-to-Date Cumulative *

11. Hours In Reporting Period 719.0 2879.0 8613.3

12. Number Of Hours Reactor Was Critical 719.0 2847.5 8145.8 l 13. Reactor Reserve Shutdown Hours 0.0 0.0 0.0 4

14. Hours Generator On-Line 719.0 2822.0 8029.3 i 15. Unit Reserve Shutdown Hours 0.0 0.0 0.0

16. Gross Thermal Energy Generated (MWH) 2406348 9065053 25630510

17. Gross Electrical Energy Generated (MWH) 814700 3021300 8535632

18. Net Electrical Energy Generated (MWH) 778141 2875091 8109325

19. Unit Service Factor 100.0 98.0 93.2

20. Unit Availability Factor 100.0 98.0 93.2

21. Unit Capacity Factor (Usina MDC Net) 100.9 93.1 87.7

22. Unit Capacity Factor (Usireg DER Net) 99.7 92.0 86.7

23. Unit Forced Outage Rate 0.0 0.0 6.2 j 24. Shutdowns Scheduled Over Next 6 Months (Type, Date, and Duration of Each):

i Refueling Outage, September 1, 1986, 63 days 1

! 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 t

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

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i DC0455

OPERATING DATA REPORT DOCKET N0. 50-323 DATE 05/01/86 COMPLETED BY A.T. Keller l TELEPHONE (805)595-7351 OPERATING STATUS l 1. Unit Name: Diablo Canyon Unit 2 '

l 2. Reporting Period: April 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): 1124 i 7. Maximum Dependable Capacity (Net MWe): 1073 3 8. If Changes Occur in Capacity Ratings (Items Number 3 Through 7) Since Last Report, j Give Reasons:  !

Maximum Dependable Capacities (items 6 and 7) have been calculated i

l 9. Power Level To Which Restricted, If Any (Net MWe): N/A l 10. Reasons For Restrictions, If Any: None This Month Yr-to-Date* Cumulative *

11. Hours In Reporting Period 719.0 1172.0 1172.0

12. Number Of Hours Reactor Was Critical 692.0 1100.0 1100.0

13. Reactor Reserve Shutdown Hours 0.0 0.0 0.0

, 14. Hours Generator On-Line 664.8 1072.8 1072.8

15. Unit Reserve Shutdown Hours 0.0 0.0 0.0

16. Gross Thermal Energy Generated (MWH) 2058587 3431527 3431527

17. Gross Electrical Energy Generated (MWH) 678700 1135099 1135099 l 18. Net Electrical Energy Generated (MWH) 642117 1075318 1075318 i 19. Unit Service Factor 92.5 91.5 91.5

! 20. Unit Availability Factor 92.5 91.5 91.5

] 21. Unit Capacity Factor (Using MDC Net) 83.2 85.5 85.5 1 22. Unit Capacity Factor (Using DER Net) 79.8 82.0 82.0

23. Unit Forced Outage Rate 7.5 8.5 8.5

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

N/A i

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 i

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

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DC0455

O AVERAGE DAILS. UNIT POWER LEVEL DOCKET N0. 50-275 UNIT Diablo Canyon Unit 1 DATE 05/01/86 COMPLETED BY A.T. Keller TELEPHONE (805)595-7351 MONTH April 1986 DAY AVERAGE DAILY POWER LEVEL DAY AVERAGE DAILY POWER LEVEL (MWe-Net) (MWe-Net) 1 1083 17 1087 2 1081 18 1086 3 1088 19 1087 4 1054 20 1074 5 1053 21 1087 6 1086 22 1087 7 1091 23 1087 8 1087 24 1087 9 1091 25 1087 10 1089 26 1087 11 1087 27 1001 12 1083 28 1083 13 1074 29 1087 14 1086 30 1087 15 1091 16 1087 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

AVERAGE DAILY UNIT POWER LEVEL DOCKET N0. 50-323 UNIT Diablo Canyon Unit 2 DATE 05/01/86 COMPLETED BY A.T. Keller TELEPHONE (805)595-7351 MONTH April 1986 DAY AVERAGE DAILY POWER LEVEL DAY AVERAGE DAILY POWER LEVEL (MWe-Net) (MWe-Net) 1 -39 17 1082 2 127 18 916 3 837 19 1076 4 1076 20 1030 5 1092 21 1080 6 900 22 1043 7 1084 23 1080 8 1088 24 1093 9 336 25 1075 10 267 26 1081 11 674 27 1008 12 1057 28 1086 13 579 29 1078 14 748 30 1073 15 1043 1 16 1085 l

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

UNIT SHUTDOWNS -

Page 1 of 1 DOCKET N0. 50-275 UNIT NAME Diablo Canyon Unit 1 ,

DATE 05/02/86 COMPLETED BY D.P. SISK .

REPORT MONTH APRIL 1986 TELEPHONE (805)595-7351 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 None t

4 j

I 1 2 3 4 F: Forced Reason: Method: Exhibit G - Instructions i S: Scheduled A-Equipment Failure (Explain) 1-Manual for Preparation of Data i 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-N/A Exhibit I - Same Source H-Other (Explain) 9-Other DC0455

UNIT SHUTDOWNS .

Page 1 of 2 DOCKET NO. 50-323 UNIT NAME Diablo Canyon Unit 2 DATE 05/03/86 COMPLETED BY D.P. SISK ,

REPORT MONTH APRIL 1986 TELEPHONE (805)595-7351 Method of Licensee Cause & Corrective Duration System Component 2 3 Event 4 5 Action to No. Date Type l (Hours) Recson Shutdown Report # Code Code Prevent Recurrence 1 04/01/86 F 31.5 A 4 2-86-011 SG COND A marual 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 - 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-Continuation from (NUREG-1022)

E-0perator Training & License Examination previous month F-Administrative 5-Power reduction 5 G-0perational Error (Explain) 6,7,8-N/A Exhibit I - Same Source H-Other (Explain) 9-Other DC0455

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i UNIT SHUTD0WNS .

I Page 2 of 2 DOCKET NO. 50-323 -

UNIT NAME Diablo Canyon Unit 2 ]

DATE 05/03/86 COMPLETED BY D.P. SISK ,

REPORT MONTH APRIL 1986 TELEPHONE (805)595-7351 Method of Licensee Cause & Corrective Duration System Component Action to 2

Event l 3 4 5 No. Date Type (Hours) Reason Shutdown Report # Code Code Prevent Recurrence 2 04/09/86 F 22.7 A 3 2-86-012 JK DET An automatic reactor trip and subsequent turbine trip occurred due to a low steam generator level coincidental with steam flow / feed flow mismatch which was caused by a main feedwater pump (MFP) 2-2 trip. The MFP 2-2 trip was caused by the failure of a thrust bearing wear detector probe which produced a thrust bearing wear signal and subsequent trip of MFP 2-2.

The wear detector probe was replaced '

and since examination of equipment t

' history showed no previous failures, no additional corrective action was l determined to be neces'ary.

1 2 3 4 F: Forced Reason: Method: Exhibit G - Instructions l S: Scheduled A-Equipment Failure (Explain) 1-Manual for Preparation of Data i 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) l E-Operator Training & License Examination previous month l 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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PACIFIC GAS AND E LE C T RIC C O M PANY DIABLO CANYON POWER PLANT PO. Box 56

• Avila Beach, Cahtomia 93424 *(805) 595-7351 lllllllll R.C. THORNBERRY PLANT MANAGER May 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 April,1986 Gentlemen:

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

Sincerely, d

ROBERT C. THORNBERRY RCT: lam Enclosures cc Mr. John B. Martin, Regional Administrator Region V - USNRC 9 ,p DC0455