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MONTHLY NARRATIVE REPORTOF OPERATION

AND MAJOR MAINTENANCE EXPERIENCE

This report describes the operating and major maintenance experience forthe month of October,1986. This narrative report was prepared by theplant staff and is submitted in accordance with Section 6.9.1.7 of the

i Units 1 and 2 Technical Specifications.

On October 1, 1986 Unit 1 started the month shutdown for its firstrefueling outage. Unit 2 started the month at 50%

; power.

Unit 2 returned to full power then reduced powerto 50% to locate saltwater leakage into the maincondenser.

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Unit 1 experienced an ESF actuation when a! spurious high radiation level alarm actuated the

containment ventilation isolation system.

On October 2, 1986 Unit 2 returned to full power.

Unit 2 experienced an ESF actuation when dieselgenerator 2-2 automatically started during anautomatic bus transfer due to an electricianj

inadvertently grounding a terminal in a component' cooling water pump breaker cubicle while

performing preventive maintenance.

On October 3, 1986 Unit 2 reduced power to 50% to locate saltwaterleakage into the main condenser.

On October 4,1986 Unit 2 returned to full power.t

,On October 6, 1986 Af ter peak load demand Unit 2 reduced power to 60%

l to lower steam generator chloride levels byreducing chloride inleakage cased by vibratingcondenser tubes.

On October 7, 1986 Unit I completed defueling. Unit 2 returned tofull power to support the PGandE system load then

' af ter peak load demand reduced to 60% to lower: steam generator chloride levels by reducing

chloride inleakage caused by vibrating condensertubes.

On October 8,1986 Unit 2 returned to full power then after peak load;

j demand reduced power to 50% to locate saltwaterleakage into the main condenser.4

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i Unit 1 experienced an ESF actuation when aspurious high radiation level alarm actuated the

8701300007 061031 containment ventilation isolation system.'

PDR ADOCK 00000275R PDR

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On October 10, 1986 Unit 2 returned to full power then reduced powerto 60% to locate saltwater leakage into the maincondenser.-

On October 11, 1986 Unit 2 returned to full power.

On October 15, 1986 Commenced reloading Unit 1 core.

On October 19, 1986 Unit I core reload completed.

On October 31, 1986 Unit 1 ended the month shutdown for refueling.Unit 2 ended the month at full power.

Unit I was continuing its first refueling outage which started August 29.The core offload to the spent fuel pool commenced on September 30 and wascompleted on October 7. The core reload commenced on October 15 and wascompleted on October 19. The only problem experienced was during the coreoffload a fuel assembly was tilted. After a minor rigging operation thetilted fuel assembly was righted.

Unit 2 operated this month with a unit availability factor of 100% and aunit capacity factor of 92.8%. Unit 2 reduced power six times this month,twice to improve steam generator chemistry and four times to investigateand repair main condenser tube leaks.

No challenges to the steam generator safety valves or pressurizer poweroperated relief valves have been made. Unit I has numerous safety relatedmaintenance activities performed in support of the refueling outage,including:

o Steam generator feedwater sparger "J" tube replacemento Steam generator eddy current tube inspectiono Steam generator sludge removalo Reactor disassembly for refueling

'o Overhaul of two containment fan cooler unit motorso Nuclear instrument inverter changeout of inverters 1-3 and 1-4o Installation of redundant overcurrent devices for containment

penetration conductorso Diesel Generator 1-1, 1-2 and 1-3 18 month inspectionso 4 kV vital bus wiring inspectiono Setting of limit switches on motor operated valveso Anchor Darling model 5500 snubber modifications

No major safety related maintenance was performed on Unit 2 this month.

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OPERATING DATA REPORT

DOCKET N0. 50-275DATE 11/03/86

COMPLETED BY A.T. KellerTELEPHONE (805)S95-7351

OPERATING STATUSi

1. Unit Name: Diablo Canyon Unit 12. Reporting Period: October 19863. Licensed Thermal Power (MWt): 33384. Nameplate Rating (Gross MWe): 11375. Design Electrical Rating (Net MWe): 10866. Maximum Dependable Capacity (Gross MWe): 11257. Maximum Dependable Capacity (Net MWe): 10738. 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/A10. Reasons For Restrictions, If Any: None

This Month Yr-to-Date Cumulative *

11. Hours In Reporting Period 745.0 7296.0 13030.312. Number Of Hours Reactor Was Critical 0.0 5740.4 11038.713. Reactor Reserve Shutdown Hours 0.0 0.0 0.014. Hours Generator On-Line 0.0 5714.9 10922.215. Unit Reserve Shutdown Hours

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0.0 0.0 0.016. Gross Thermal Energy Generated (MWH) 0.0 16927830 3349328317. Gross Electrical Energy Generated (MWH) 0.0 5608200 1112253218. Net Electrical Energy Generated (MWH) -2688 5310023 1054425719. Unit Service Factor 0.0 78.3 83.8,

1 20. Unit Availability Factor 0.0 78.3 83.8: 21. Unit Capacity Factor (Using MDC Net) 0.0 67.8 75.4

22. Unit Capacity Factor (Using DER Net) 0.0 67.0 74.523. Unit Forced Outage Rate 0.0 0.0 4.624. 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: November 19, 198626. Units In Test Status (Prior to Commercial Operation): N/A

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

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OPERATING DATA REPORT>

DOCKET NO. 50-323DATE 11/03/86

COMPLETED BY A.T. KellerTELEPHONE (805)S95-7351

OPERATING STATUS

1. Unit Name: Diablo Canyon Unit 22. Reporting Period: October 19863. Licensed Thermal Power (MWt): 34114. Nameplate Rating (Gross MWe): 11645. Design Electrical Rating (Net MWe): 1119

i 6.Maximum Dependable Capacity ((Gross MWe):

1130Maximum Dependable Capacity NetMWe): 10797.

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/A10. Reasons For Restrictions, if Any: None

This Month Yr-to-Date* Cumulative *

11. Hours In Reporting Period 745.0 5589.0 5589.012. Number Of Hours Reactor Was Critical 745.0 5393.0 5393.013. Reactor Reserve Shutdown Hours 0.0 0.0 0.014. Hours Generator On-Line 745.0 5266.4 5266.415. Unit Reserve Shutdown Hours 0.0 0.0 0.016. Gross Thermal Energy Generated (MWH) 2385411 16320057 1632005717. Gross Electrical Energy Generated (MWH) 785400 5336999 533699918. Net Electrical Energy Generated (MWH) 745634 5052960 5052960'

19. Unit Service Factor 100.0 94.2 94.220. Unit Availability Factor 100.0 94.2 94.221. Unit Capacity Factor (Using MDC Net) 92.8 83.8 83.822. Unit Capacity Factor (Using DER Net) 89.4 80.8 80.823. Unit Forced Outage Rate 0.0 5.8 5.824. 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 (Dateof commercial operation)

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AVERAGE DAILY UNIT POWER LEVEL

DOCKET NO. _50-275UNIT Diablo Canyon Unit 1DATE 11/03/86

COMPLETED BY A.T. KellerTELEPHONE (805)S95-7351

MONTH October 1986

DAYAVERAGE DAILY POWER LEVEL DAY

(MWe-Net) AVERAGE DAILY POWER LEVEL(MWe-Net)

1 -417 -5

2 -3 18 -53 -3 19 -54 -4 20 -65 -3

21 -46 -3 22 -37 -3 23 -38 -? 24 -79 -2 25 -210 0 26 -1

11 -2 27 -912 -3 28 -413 -314

_ 29 -3-3 30 -3

15 -331 -3

16 -4

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INSTRUCTIGNS

On this format, list the average daily unit power level in ifWe-Net for each day in the{ reporting rnanth.Cornpute to the nearest whole megawatt.

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AVERAGE DAILY UNIT POWER LEVEL

DOCKET N0. 50-323UNIT Diablo Canyon Unit 2DATE 11/03/86

COMPLETED BY A.T. KellerTELEPHONE (805)S95-7351

MONTH October 1986

DAY AVERAGE DAILY POWER LEVEL DAY AVERAGE DAILY POWER LEVEL(MWe-Net) (MWe-Net)

1 844 17 1071

2 923 18 1075

3 964 19 1038

4 669 20 1075

5 1042 21 1075

6 1057 22 1075

7 900 23 1088

8 847 24 1083

9 542 25 1083

10 962 26 1054

11 775 27 1092

12 1071 28 1087

13 1075 29 1083

14 1075 30 1079

15 1066 31 1083

16 1071

INSTRUCTIONS

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

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UNIT SHUTDOWNSPage 1 of 1 DOCKET NO. 50-275 *

UNIT NAME Diablo Canyen Unit 1 *

DATE 11/03/86 .

COMPLETED BY T.A. NELSONREPORT MONTH OCTOBER 1986 TELEPHONE (805)595-7351

Licensee Cause & Corrective- Method of System ComponentDuration Event Action to,

l 2 3 4 5No. Date Type (Hours) Reason Shutdown Report # Code Code Prevent Recurrence

1 8/29/86 5 745.0 C 4 N/A N/A N/A Diablo Canyon Unit I continued itsfirst refueling outage.

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

B-Maintenance or Test 2-Manual Scram Entry Sheets for LicenseeC-Refueling 3-Automatic Scram Event Report (LER) FileD-Regulatory Restriction 4-Continuation from (NUREG-1022)E-Operator Training & License Examination previous monthF-Administrative 5-Power reduction 5G-Operational Error (Explain) 6,7,8-N/A Exhibit I - Same SourceH-Other (Explain) 9-Other

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Page 1 of 1 DOCKET NO. 50-323 *

UNIT NAME Diablo Canyon Unit 2 .';

| DATE 11/03/86 .

1 COMPLETED BY T.A. NELSON{ REPORT MONTH OCTOBER 1986 TELEPHONE (805)595-7351?

Licensee Cause & Corrective i. Method of System ComponentDuration Event Action to,

l 2 3 4 5No. Date Type (Hours) Reason Shutdown Report # Code Code Prevent Recurrence\

| None

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1 1 2 3 4F: 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) FileD-Regulatory Restriction 4-Continuation from (NUREG-1022)E-Operator Training & License Examination previous monthF-Administrative 5-Power reduction 5G-Operational Error (Explain) 6,7,8-N/A Exhibit I - Same SourceH-0ther(Explain) 9-Other

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

DIABLO CANYON POWER PLANTY PO Box 56 Avila Beach, Cahfornia 93424 *(805) 595-7351ggggggggg

R C. THORNBERRYPLANT AAANAOL9

November 10, 1986

Director, Office of Resource ManagementU.S. Nuclear Regulatory CommissionWashington, DC 20555

RE: Docket No. 50-275 and 50-323License No. DPR-80 and DPR-82Monthly Operating Report for October, 1986

Gentlemen:

Enclosed are the completed monthly operating report forms for Diablo CanyonUnits 1 and 2 for October,1986. This report is submitted in accordance withSection 6.9.1.7 of the Units 1 and 2 Technical Specifications.

Sincerely,

$0|'

ROBERT C. THORNBERRY

RCT:Im

Enclosures

cc Mr. John B. Martin, Regional AdministratorRegion V - USNRC

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