DCL-02-111, August 2002 Monthly Operating Report for Diablo Canyon Units 1 & 2
| ML022670034 | |
| Person / Time | |
|---|---|
| Site: | Diablo Canyon  |
| Issue date: | 09/13/2002 |
| From: | Becker J Pacific Gas & Electric Co |
| To: | Document Control Desk, Office of Nuclear Reactor Regulation |
| References | |
| DCL-02-111, GL-97-002 | |
| Download: ML022670034 (7) | |
Text
and Pacific Gas rnPacificGas and Electric Company James R. Becker Station Director Diablo Canyon Power Plant Mail Code 104/5/504 P0 Box 56 Avila Beach, CA 93424 September 13, 2002 805 545 3462 Fax 805 545 4234 PG&E Letter DCL-02-1 11 U.S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, DC 20555-0001 Docket No. 50-275, OL-DPR-80 Docket No. 50-323, OL-DPR-82 Diablo Canyon Units I and 2 Monthly Operating Report for August 2002 Dear Commissioners and Staff.
Attached is the Monthly Operating Report for Diablo Canyon Power Plant, Units I and 2, for August 2002. This report is submitted in accordance with Technical Specification 5.6.4 and NRC Generic Letter 97-02.
Imp/17131R0235849 Enclosures cc/enc: Paul R. Fox, American Nuclear Insurers Robert D. Glynn, Jr.
Barbara Lewis, McGraw Hill Ellis W. Merschoff, NRC Regional Administrator, Region IV David L Proulx NRC Senior Resident Inspector Gregory M. Rueger Girija S. Shukla, NRC Project Manager INPO Record Center A member of the STARS (Strategic Teaming and Resource Sharing) Alliance CaUaway e Comanche Peak
- Diablo Canyon
- Palo Verde
- South Texas Project m Wolf Creek
Enclosure 1 PG&E Letter DCL-02-1 11 AUGUST 2002, OPERATION SUMMARIES DIABLO CANYON POWER PLANT UNITS I AND 2 Summary of Unit 1 Operation Unit 1 began August in Mode 1 (Power Operation) at approximately 100 percent power.
However, high vibrations on the main generator current transformer (CT) continued during the month. On August 6, 2002, operators reduced power to approximately 83 percent due to high CT vibration. Management initiated plans to take the generator off-line over the weekend to perform corrective action. On August 9, 2002, operators reduced power from 100 percent due to high CT vibration. On August 10, 2002, operators manually took the unit off-line while maintaining the reactor in Mode 1 at approximately 15 percent power. After a balance shot was installed, operators paralleled the unit to the grid and increased power. On August 11, 2002, after reaching approximately 97 percent power, CT vibration again exceeded limits forcing operators to reduce power and manually take the unit off-line while maintaining the reactor in Mode 1 at approximately 15 percent power. On August 12, 2002, operators paralleled the unit to the grid and increased power. High CT vibrations continued to prevent the operators from maintaining the unit at 100 percent power. On August 23, operators reduced power from approximately 92 percent due to high CT vibration. On August 24, 2002, operators manually took the unit off-line while maintaining the reactor in Mode 1 at approximately 15 percent power. On August 24, 2002, after completing maintenance, operators paralleled the unit to the grid and increased power. Unit 1 ended the month in Mode 1 at approximately 98 percent power, which is the threshold to limit CT vibration.
Summary of Unit 2 Operation Unit 2 remained in Mode 1 at approximately 100 percent power during August. On August 19, 2002, a ground was identified on a power cable supplying a Component Cooling Water (CCW) pump. Troubleshooting, cable replacement, and testing could not be completed within the technical specification completion time of 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br />. A technical specification required shutdown was avoided when the NRC granted a Notice of Enforcement Discretion in response to PG&E letter DCL-02-1 00, "Request for Enforcement Discretion Regarding Compliance with Technical Specification 3.7.7, Vital CCW System." On August 23, 2002, after completing the cable replacement and testing, the CCW pump was returned to service.
Actuations of Safety or Pressurizer Power Operated Relief Valves There were no challenges to the pressurizer power operated relief valves, pressurizer safety valves, or steam generator safety valves.
Enclosure 2 PG&E Letter DCL-02-1 11 OPERATING DATA REPORT DOCKET NO.: 50-275 UNIT NAME: Diablo Canyon Unit 1 DATE: 09/03/2002 COMPLETED BY: L. M. Parker TELEPHONE: (805) 545-3386 REPORT MONTH: August 2002
- 1. Design Electrical Rating (MWe - Net): 1 1,103
- 2. Maximum Dependable Capacity (MWe - Net): 1,087 This Month YTD Cumulative
- 3. Number of Hours Reactor Critical: 744.0 5,115.5 132,535.5
- 4. Number of Hours Generator On-Line: 705.0 4,998.2 131,040.5
- 5. Unit Reserve Shutdown Hours: 0.0 0.0 0.0
- 6. Net Electrical Energy Generated (MWH): 729,757 5,329,881 135,487,970 1
Enclosure 2 PG&E Letter DCL-02-111 UNIT SHUTDOWNS DOCKET NO.: 50-275 UNIT NAME: Diablo Canyon Unit 1 DATE: 09/03/2002 COMPLETED BY: L. M. Parker TELEPHONE: (805) 545-3386 REPORT MONTH: August 2002 NO. DATE TYPE "F DURATION (HOURS) REASON1 METHOD OF & CORRECTIVE CAUSEACTIONS (YYMMDD)
(Forced)
S (Scheduled) SHUTTING COMMENTS DOWN2 020810 F 12.6 A Increasing vibrations in the main generator current transformer (CT) during the week prompted operators to reduce power and manually take the unit off-line to perform a "balance shot" on the rotor. The reactor remained in Mode 1 at approximately 15 percent power. Therefore, this event is counted for the "duration" off-line but not as a reactor shutdown.
020811 F 8.2 A After ramping the unit up in power, vibrations in the CT forced operators to manually take the unit off-line to attempt a "balance shot" on the rotor. The reactor remained in Mode 1 at approximately 15 percent power. Therefore, this event is counted for the "duration" off-line but not as a reactor shutdown.
2
Enclosure 2 PG&E Letter DCL-02-111 UNIT SHUTDOWNS DOCKET NO.: 50-275 UNIT NAME: Diablo Canyon Unit 1 DATE: 09/03/2002 COMPLETED BY: L. M. Parker TELEPHONE: (805) 545-3386 REPORT MONTH: August 2002, (continued)
NO. DATE TYPE DURATION REASON' METHOD OF & CORRECTIVE CAUSEACTIONS F (Forced)
S (Scheduled)
(HOURS) SHUTTING DOWN 2 COMMENTS 020824 F 18.2 A Vibrations in the CT forced operators to manually take the unit off-line to attempt a "balance shot" on the rotor. The reactor remained in Mode 1 at approximately 15 percent power. Therefore, this event is counted for the "duration" off-line but not as a reactor shutdown.
- 1. Reason 2. Method A-Equipment Failure (Explain) 1-Manual B-Maintenance or Test 2-Manual Trip/Scram C-Refueling 3-Automatic Trip/Scram D-Regulatory Restriction 4-Continuation from Previous Month E-Operator Training/License Examination 5-Other F- Administrative G-Operational Error (Explain)
H-Other (Explain) 3
O Enclosure 2 PG&E Letter DCL-02-1 11 OPERATING DATA REPORT DOCKET NO.: 50-323 UNIT NAME: Diablo Canyon Unit 2 DATE: 09/03/2002 COMPLETED BY: L. M. Parker TELEPHONE: (805) 545-3386 REPORT MONTH: August 2002 I 1. Design Electrical Rating (MWe - Net): 1 1119
- 2. Maximum Dependable Capacity (MWe - Net): 1087 This Month YTD Cumulative
- 3. Number of Hours Reactor Critical: 744.0 5,799.1 128,480.9
- 4. Number of Hours Generator On-Line: 744.0 5,794.0 127,018.0
- 5. Unit Reserve Shutdown Hours: 0.0 0.0 0.0
- 6. Net Electrical Energy Generated (MWH): 815,440 6,219,219 133,625,151 4
Enclosure 2 PG&E Letter DCL-02-111 UNIT SHUTDOWNS DOCKET NO.: 50-323 UNIT NAME: Diablo Canyon Unit 2 DATE: 09/03/2002 COMPLETED BY: L. M. Parker TELEPHONE: (805) 545-3386 REPORT MONTH: August 2002 NO. DATE TYPE DURATION REASON1 METHOD CAUSE & CORRECTIVE (YYMMDD) F (Forced)
S (Scheduled)
(HOURS) OF SHUTTING ACTIONS DOWNS2 COMMENTS N/A There were no shutdowns this month.
- 1. Reason 2. Method A-Equipment Failure (Explain) 1-Manual B-Maintenance or Test 2-Manual Trip/Scram C-Refueling 3-Automatic Trip/Scram D-Regulatory Restriction 4-Continuation from Previous Month E-Operator Training/License Examination 5-Other F- Administrative G-Operational Error (Explain)
H-Other (Explain) 5