ML13331B332

Monthly Operating Rept for Apr 1991 for San Onofre Nuclear Generating Station,Unit 1

ML13331B332
Person / Time
Site:	San Onofre
Issue date:	04/30/1991
From:	Vittum S SOUTHERN CALIFORNIA EDISON CO.
To:
Shared Package
ML13331B331	List: ML13331B330 ML13331B332 ML13331B333
References
NUDOCS 9105300047
Download: ML13331B332 (8)

Text

NRC MONTHLY OPERATING REPORT DOCKET NO:

50-206 UNIT NAME:

SONGS -

1 DATE: May 15, 1991 COMPLETED BY: S. L. Vittum TELEPHONE:

(714) 368-9230 OPERATING STATUS

1. Unit Name:

San Onofre Nuclear Generating Station, Unit 1

2. Reporting Period: April 1991

3. Licensed Thermal Power (MWt):

1347

4. Nameplate Rating (Gross MWe):

456

5. Design Electrical Rating (Net MWe):

436

6. Maximum Dependable Capacity (Gross MWe):

456

7. Maximum Dependable Capacity (Net MWe):

436

8. If Changes Occur In Capacity Ratings (Items Number 3 Through 7)

Since Last Report, Give Reasons:

NA

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

See Item 10

10.

Reasons For Restrictions, If Any:

Power level reduction from full power as a result of A self-imposed reduced operating temperature to retard Steam Generator tube corossion rate.

This Month Yr.-to-Date Cumulative

11.

Hours In Reporting Period 719.00 2,879.00 204,500.00

12.

Number Of Hours Reactor Was Critical 498.68 644.24 116,810.94

13.

Reactor Reserve Shutdown Hours 0.00 0.00 0.00

14.

Hours Generator On-Line 498.68 644.24 113,000.62

15.

Unit Reserve Shutdown Hours

0.

.24 000.6

16.

Gross Thermal Energy Generated (MWH) 577,239.30 668,450.20 142,107,951.81

17.

Gross Electrical Energy Generated (MWH) 195,600.00 224.400.00 47,899,744.00

18.

Net Electrical Energy Generated (MWH) 183,188.00 199,819.00 45,193,465.00

19.

Unit Service Factor 69.36%

22.38 55.26%

20.

Unit Availability Factor 69.36%

22.38%

55.26%

21.

Unit Capacity Factor (Using MDC Net) 58.44%

15.92%

50.69%

22.

Unit Capacity Factor (Using DER Net) 58.44%

15.92%

50.69%

23.

Unit Forced Outage Rate 0.00%

0.00%

19.469%

24.

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

25.

If Shutdown At End Of Report Period, Estimated Date of Startup:

NA

26.

Units In Test Status (Prior To Commercial Operation):

Forecast Achieved INITIAL CRITICALITY NA NA INITIAL ELECTRICITY NA NA COMMERCIAL OPERATION NA NA mor.apr/2 9105300047 910515 PDR ADOCK 05000206 R

PDR

AVERAGE DAILY UNIT POWER LEVEL DOCKET NO:

50-206 UNIT NAME:

SONGS - 1 DATE:

May 15. 1991 COMPLETED BY: S. L. Vittum TELEPHONE:

(714) 368-9230 MONTH:

April 1991 DAY AVERAGE DAILY POWER LEVEL DAY AVERAGE DAILY POWER LEVEL (MWe-Net)

(MWe-Net) 1 303.46 17 372.25 2

371.79 18 373.04 3

375.42 19 373.54 4

376.21 20 373.75 5

373.96 21 253.33 6

374.42 22 0.00 7

373.54 23 0.00 8

375.38 24 0.00 9

376.88 25 0.00 10 374.88 26 0.00 11 375.96 27 0.00 12 375.67 28 0.00 13 374.42 29 0.00 14 374.96 30 0.00 15 374.00 16 371.00 mor.apr/3

UNIT SHUTDOWNS AND POWER REDUCTIONS DOCKET NO:

50-206 UNIT NAME:

SONGS - 1 REPORT MONTH:

April 1991 DATE:

May 15, 1991 COMPLETED BY: S. L. Vittum TELEPHONE:

(714) 368-9230 Method of Shutting Cause & Corrective Duration Down LER System Component Action to No.

Date Type1 (Hours) Reason2 Reactor3 No.

Code4 Code5 Prevent Recurrence 141 04-21-91 S

220.19 A

2 NA SB SG Unit shutdown for SG tube leakage repair.

1F-Forced 2Reason:

3Method:

4IEEE Std 805-1984 S-Scheduled A-Equipment Failure (Explain) 1-Manual B-Maintenance or Test 2-Manual Scram.

C-Refueling 3-Automatic Scram.

D-Regulatory Restriction 4-Continuation from E-Operator Training & License Examination Previous Month F-Administrative 5-Reduction of 20%

sIEEE Std 803A-1983 G-Operational Error (Explain) or greater in the H-Other (Explain) past 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> 6-Other (Explain) mor.apr/4

SUMMARY

OF OPERATING EXPERIENCE FOR THE MONTH DOCKET NO:

50-206 UNIT NAME:

SONGS -

1 DATE:

May 15, 1991 COMPLETED BY:

S. L. Vittum TELEPHONE:

(714) 368-9230 Date Time Event 04-01-91 0001 Unit is in Mode 1 at 70% Reactor Power, 306MWe.

2350 Unit load at maximum load at 90% power, 393 MWe.

04-11-91 1009 Pressurizer PORV CV-545 opened momentarily, then closed.

04-21-91 1941 Unit off line, Entered Mode 2.

2040 Unit entered Mode 3, Reactor trip breakers open.

04-22-91 1054 Unit entered Mode 4.

1452 Unit entered Mode 5.

04-30-91 2400 Unit in Mode 5, midlop, day 9 of a 24 day outage.

mor.apr/5

0 REFUELING INFORMATION DOCKET NO:

50-206 UNIT NAME:

SONGS -

1 DATE:

May 15, 1991 COMPLETED BY:

S. L. Vittum TELEPHONE:

(714) 368-9230 MONTH:

April 1991

1. Scheduled date for next refueling shutdown.

September 1992

2. Scheduled date for restart following refueling.

Restart from the Cycle 12 refueling outage is forecast for February 1993.

3. Will refueling or resumption of operation thereafter require a Technical Specification change or other license amendment?

Yes for Cycle 12 refueling.

What will these be?

Licensing Amendment associated with the Control Room HVAC.

Licensing Amendment assosciated with the Reactor Vessel level monitoring system.

Licensing Amendment associated with modifications to the Degraded Grid Voltage protection scheme which will be modified during the outage.

Licensing Amendment associated with the Safety Injection and Recirculation System.

4. Scheduled date for submitting proposed licensing action and supporting information.

Not yet determined. Under evaluation.

mor.apr/6

11 DOCKET NO: 50-206 UNIT NAME:

SONGS - 1 DATE:

May 15, 1991 COMPLETED BY: S. L. Vittum TELEPHONE:

(714) 368-9230

5. Important licensing considerations associated with refueling, e.g. new or different fuel design or supplier, unreviewed design or performance analysis methods, significant changes in fuel design, new operating procedures.

Not yet determined. Under evaluation.

6. The number of fuel assemblies.

a) In the core.

157 b) In the spent fuel storage pool.

99

7. Licensed spent fuel storage capacity.

216 Intended change in spent fuel storage capacity.

None

8. Projected date of last refueling that can be discharged to spent fuel storage pool assuming present capacity.

Approximately 1995 (refueling only)

Approximately 1991 (full off load capability) mor.apr/7

ATTACHMENT A Challange to Unit 1 PORV CV-454 Sheet SONGS Unit 1 Monthly Operating Report

• 0 DESCRIPTION OF A CHALLENGE TO UNIT 1 RELIEF VALVE On April 11, 1991, at 1002, 120 VAC Vital Bus 1 transferred to its backup power source due to a short on charging pump cooling water flow indicator control, FIC-609B. The pressurizer "PORV OPEN" and "PRESSURIZER HIGH PRESSURE ALARMS" were received and a very short, momentary, opening of PORV CV-545 resulted in an immediate pressure drop followed by a gradual increase in the pressurizer relief tank temperature and pressure. The vital bus was subsequently transfered back to its normal power supply at 1458 on April 11, 1991 with no repeat of this event.

CV-546 remained isolated during the event due to previously documented leakage.

The reporting of a challenge to a relief valve is required by Section 6.9.1.10 of Technical Specification to Provisional Operating License No. DPR-13 for San Onofre Unit 1.