ML20141J198

Monthly Operating Rept for Dec 1985

ML20141J198
Person / Time
Site:	Rancho Seco
Issue date:	12/31/1985
From:	Colombo R SACRAMENTO MUNICIPAL UTILITY DISTRICT
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE)
References
RWC-86-22, NUDOCS 8601210163
Download: ML20141J198 (6)

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SUMMARY

OF PLANT OPERATIONS The reactor. operated at approximately 92% of full power from December-1 through December 4, 1985. -On December 5, 1985, at 1711 hours0.0198 days <br />0.475 hours <br />0.00283 weeks <br />6.510355e-4 months <br />, the reactor tripped on high reactor coolant system pressure. The reactor.was placed in a hot shutdown condition and) remained'there through December 11, 1985, while control, system maintenanch was performed. On December 12, 1985, the reactor was taken critical and,the 220 KV breakers were closed at 1616 hours0.0187 days <br />0.449 hours <br />0.00267 weeks <br />6.14888e-4 months <br /> to bring the plant on line. During the December 12-14, 1985 period the power was leveled at 10, 30 and 75 percent while control system tuning

,b was performed. On December 15, 1985 through December 21, 1985, the reactor operated at approximately 100 percent power. At 1713 hours0.0198 days <br />0.476 hours <br />0.00283 weeks <br />6.517965e-4 months <br /> on December 22, 1985, the reactor was manually tripped and brought to hot shutdown to repair a leaking pressurizer sampling isolation valve. Following the repair, the plant was brought critical and placed on line at 2213 hours0.0256 days <br />0.615 hours <br />0.00366 weeks <br />8.420465e-4 months <br /> on December 24, 1985. The plant tripped at 76. percent power on December 26, 1985 at 0415 i, hours and was brought to a cold shutdown condition for the remainder of the month.

PERSONNEL CHANGES REQUIRING REPORT NONE -

SUMMARY

OF CHANGES IN ACCORDANCE WITH 10 CFR 50.59(b)

NONE MAJOR ITEMS OF SAFETY RELATED MAINTENANCE 'i

, The packing gland of pressurizer liquid sample valve (SFV 70001) was dis-assembled and inspected for damage which resulted in the plant being brought

, to hot shutdown on December 22, 1985. No. damage was observed. Twelve (12) rings of packing were added and the packing gland was adjusted to eliminate y leakage.

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n 8601210163 951231 PDR ADOCE 05000312 R PM W

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4 REFUELING INFORNATION REQUEST

1. Name of Facility Rancho Seco Unit 1

2. Scheduled date for next refueling shutdown: Jan 1. 1987

3. Scheduled date for restart following refueling: May 1.1987

4. Technical Specification change or other license amendment required:

a) Change-to Rod Index vs Power Level Curve (TS 3.5.2)

- b) Change to Core Imbalance vs Power Level Curve (TS 3.5.2) c) Tilt Limits'(TS 3.5.2) -

5. Scheduled date(s) for submitting proposed licensing action: Aug 1. 1986-

6. Important licensing considerations associated with refueling: N/A

7. Number of fuel assemblies:

a) In the core: 177 b) In the Spent Fuel Pool: 316

8. Present licensed spent fuel capacity: 1080

9. Projected date of the last refueling that can be discharged to the Spent Fuel Pool: December 3. 2001 i

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AVERAGE DAILY UNIT POWER LEVEL DOCKET NO. 50-312 UNIT Rancho Seco Unit 1 DATE. 12-31 COMPLETED 8Y R. Colombo TELEPHONE (916) 452-3211 MONTH December 1985 DAY AVERAGE DAILY POWER LEVEL DAY AVERAGE DAILY POWER LEVEL (MWe-Net) (MWe-Net) 1 811 17 895 2 798 18 896 3 808 19 896  :

4 800 20 897 5 566 21- 895 6 0 22- 614 7 0 23 0 8 0 24 0 9 0 25 492 10 0 26 84 11 0 27 0 12 12 28 0 13 400 29 0 14 773 30 0 15 837 31 0

~16 897 INSTRUCTIONS On this formni., list the average daily unit power level in MWe-Net. for. each day i in the reporting month. Compute to the nearest whole megawatt.

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• l OPERATING DATA REPORT DOCKET NO. 50-312 DATE 12/31/85 COMPLETED BY R. Colombo TELEPHONE (916) 452-3211 OPERATING STATUS NOTE:

1. Unit Name: Rancho Seco Unit 1

2. Reporting Period: December 1985

3. Licensed Thermal Power (NWt): 2.772

4. Nameplate Rating (Gross MWe): 963

5. Design Electrical Rating (Net NWe): 918 4

6. Maximum Dependable Capacity (Gross MWe): 917

7. Maximum Dependable Capacity (Net MWe): 873

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: N/A This Month Yr-to-Date Cumulative

11. Hours in Reporting Period 744 8.760 93.865

, 12. Number of Hours Reactor Was Critical 408 2.874.6- 54.322

13. Reactor Reserve Shutdown Hours 0 110.5 10.300.4

14. Hours Generator On-Line 384.2 2.700.3 50.363.8

15. Unit Reserve Shutdown Hours 0 0 1.210.2

16. Gross Thermal Energy Generated (MWH) 948.662 6.255.286 127.861.688

17. Gross Electrical Energy Generated (MWH) 318.261 2.091.007 41.522.970

'i 8 . Net Electrical Energy Generated (MWH) 289.607 1.936.236 38.527.432

19. Unit Service Factor 51.6% 30.8% 53.7%

20. Unit Availability Factor , 51.6% 30.8% 54.9% .

21. Unit Capacity Factor (Using MDC Net) 44.6% 25.3% 47.0%

22. Unit Capacity Factor (Using DER Net) 42.4% 24.1% 44.7%

. 23. Unit Forced Outage Rate 48.4%- 32.4% 30.0%

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

N/A

25. If Shut Down At End Of Report Period,-Estimated Date of Startup: February 28. 1986

26. Units In Test Status (Prior to Commercial Operation): Forecast Achieved

-INITIAL CRITICALITY N/A N/A INITIAL ELECTRICITY 1

N/A N/A COMMERCIAL OPERATION N/A N/A b

c DOCKET NO. 50-317 UNIT SHUTDOWNS AND POWER REDUCTIONS UNIT NAME Ranchn Soen linit 1 -

DATE 12/31/85 COMPLETED BY R_ W rninmhn REPORTMONm DECEMBER 1985 TELEPHONE (916) 492-3211 w.

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, 3E 3 *I3 Licensee $% j"3.

Cause & Corrective

% Date g 3g s 3s5 Event g?

mV gU Action to H

$= 5 j if; y Report a g Prevent Recurrence 3

7 85/12/05 F 167.1 G 3 85-23 ZZ ZZZZZZ Reactor tripped on high pressure re-sulting from FW underfeed. ICS modules examined and refurbished.

8 85/12/22 F 53.0 A 1 85-24 CB VALVEX Reactor shutdown when leak from.

sample isolation valve, SFV-70001 was detected. Leakage was post packing gland, gland repaired.

9 85/12/26 F 139.7 A 3 85-25 CB INSTRU Reactor trip on high pressure.

Total loss of ICS power. Corrective action still under investigation.

'I 2 3 4 F: Forced - Reason: Method: Exhibit G . Instructions S: Scheduled A-Equipment Failure (Explain) I-Manual for Preparation of Data B-Maintenance of Test 2-Manual Scram. Entry Sheets for Licensee C-Refueling 3 Automatic Scram. Event Report (LER) File iNUREG-D-Regulatory Restriction 4-Other (Explain) 0161)

E Orerator Training & 1.icense Examination F Administrative 5 G-Operational Error (Explain) Exhibit I - Same Source 19/77) II-Other (Explain)

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MUD SACRAMENTO MUNICIPAL UTILITY DISTRICT '._ 6201 S Street, P.O. Box 15830, Sacramento CA 95852-1830,(916)452-3211 AN ELECTRIC SYSTEM SERVING THE HEART OF CALIFORNIA RWC 86-22 January 10, 1986 DIRECTOR OFFICE OF INSPECTION AND ENFORCEMENT U S NUCLEAR REGULATORY COMMISSION WASHINGTON DC 20555 OPERATING PLANT STATUS REPORT DOCKET NO. 50-312 Enclosed is the December 1985 Monthly Plant Status Report for Rancho Seco Unit One.

h R. W. COLOMB0 REGULATORY COMPLIANCE SUPERINTENDENT Enci (5) cc: I & E Washington (9)

Region V MIPC (2) -

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RANCHO SECO NUCLEAR GENERATING STATION O 14440 Twin Cities Road, Herald, CA 95638 9799;(209) 333-2935

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