View source for DCL-02-094, July 2002 Monthly Operating Report for Diablo Canyon. Corrected June 2002 Monthly Operating Report for Unit 1, Enclosed

{{Adams
| number = ML022340425
| issue date = 08/15/2002
| title = July 2002 Monthly Operating Report for Diablo Canyon. Corrected June 2002 Monthly Operating Report for Unit 1, Enclosed
| author name = Becker J
| author affiliation = Pacific Gas &amp; Electric Co
| addressee name = 
| addressee affiliation = NRC/Document Control Desk, NRC/NRR
| docket = 05000275, 05000323
| license number = DPR-080, DPR-082
| contact person = 
| case reference number = DCL-02-094
| document type = License-Monthly Operating Report
| page count = 7
}}

=Text=
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PacificGas and Electric Company James R. Becker Station Director Diablo Canyon Power Plant Mail Code 104/5/504 P0 Box 56 Avila Beach, CA 93424 August 15, 2002                                                                                    8055453462 Fax 805 545 4234 PG&E Letter DCL-02-094 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 July 2002

==Dear Commissioners and Staff:==

Attached is the Monthly Operating Report for Diablo Canyon Power Plant, Units I and 2, for July 2002. This report is submitted in accordance with Technical Specification 5.6A and NRC Generic Letter 97-02.
Also attached is Enclosure 3, which is being submitted to replace Page 2 of Enclosure 2, "Unit Shutdowns" for Unit 1, in the June 2002 Monthly Operating Report, DCL-02-076, dated July 12, 2002. Revision bars and lineouts indicate the changes.
Imp/1713/R0235849 Enclosures cclenc:      Paul R. Fox, American Nuclear Insurers Robert D. Glynn, Jr.
Barbara Lewis, McGraw Hill Ellis W. MerschKff, NRC Regional Administrator, Region IV David L. Proulx, NRC Senior Resident Inspector                                                       'I Gregory M. Rueger Girija S. Shukia, NRC Project Manager INPO Record Center A member of the STARS (Strategic Teaming and Resource Sharing) Alliance Cattaway
* Comanche Peak
* Diabto Canyon
* Palo Verde e South Texas Project 9 Wolf Creek

Enclosure 1 PG&E Letter DCL-02-094 JULY 2002, OPERATION SUMMARIES DIABLO CANYON POWER PLANT UNITS I AND 2 Summary of Unit I Operation Unit 1 began July in Mode 1 (Power Operation) at approximately 100 percent power. On July 2, 2002, Operators reduced power to as low as approximately 81 percent due to increasing turbine vibration. After adjusting generator seal temperatures, vibrations decreased. On July 4, 2002, operators returned the unit to approximately 100 percent power. On July 13, 2002, operators reduced power to approximately 15 percent and separated the generator from the grid due to increasing vibrations at the turbine generator current transformers. On July 14, 2002, after installing a "balance shot" on the turbine, operators paralleled the unit to the grid, and increased power to approximately 100 percent.
Summary of Unit 2 Operation Unit 2 began July in Mode I at approximately 100 percent power. There were no significant operational activities.
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-02-094 OPERATING DATA REPORT DOCKET NO.:         50-275 UNIT NAME:          Diablo Canyon Unit 1 DATE:               08/01/2002 COMPLETED BY:       L. M. Parker TELEPHONE:           (805) 545-4327 REPORT MONTH: July 2002 1 1. 1Design 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       4,371.5   131,791.5
: 4. Number of Hours Generator On-Line:           729.8       4,293.2   130,335.5
: 5. Unit Reserve Shutdown Hours:                    0.0          0.0          0.0
: 6. Net Electrical Energy Generated (MWH):     787,822    4,600,1241 134,758,213 I

Enclosure 2 PG&E Letter DCL-02-094 UNIT SHUTDOWNS DOCKET NO.:              50-275 UNIT NAME:               Diablo Canyon Unit 1 DATE:                    08/01/2002 COMPLETED BY:            L. M. Parker TELEPHONE:                (805) 545-4327 REPORT MONTH: July 2002 NO. DATE        TYPE         DURATION      REASON1     METHOD        CAUSE & CORRECTIVE (YYMMDD)     F (Forced)     (HOURS)                      OF                 ACTIONS S (Scheduled)                           SHUTTING DOWNS 2             COMMENTS 020713           F            14.2         A                     Increasing vibrations in the turbine generator forced operators to reduce power. The generator was manually taken off line. 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 shutdown of the reactor.
: 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) 2

Enclosure 2 PG&E Letter DCL-02-094 OPERATING DATA REPORT DOCKET NO.:         50-323 UNIT NAME:          Diablo Canyon Unit 2 DATE:               08/01/2002 COMPLETED BY:       L. M. Parker TELEPHONE:          (805) 545-4327 REPORT MONTH: July 2002
: 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       5,055.1    127,736.9
: 4. Number of Hours Generator On-Line:           744.0       5,050.0    126,274.0
: 5. Unit Reserve Shutdown Hours:                    0.0          0.0           0.0
: 6. Net Electrical Energy Generated (MWH):     814,205    5,403,779   132,809,711 3

Enclosure 2 PG&E Letter DCL-02-094 UNIT SHUTDOWNS DOCKET NO.:             50-323 UNIT NAME:               Diablo Canyon Unit 2 DATE:                   08/01/2002 COMPLETED BY:            L. M. Parker TELEPHONE:               (805) 545-4327 REPORT MONTH: July 2002 NO. DATE          TYPE F (Forced)
DURATION (HOURS)     REASON'     METHOD OF                & CORRECTIVE CAUSEACTIONS S (Scheduled)                         SHUTTING DOWN2              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) 4

Enclosure 3 PG&E Letter DCL-02-094 UNIT SHUTDOWNS DOCKET NO.:                50-275..,
UNIT NAME:                 Diablo Canyon Unit 1 DATE:                      07/01/2002 COMPLETED BY:              R. L. Russell TELEPHONE:                 (805) 545-4327 REPORT MONTH: June 2002 NO.       DATE         TYPE        DURATION    REASON'     METHOD          CAUSE & CORRECTIVE (YYMMDD)      F (Forced)    (HOURS)                    OF                  ACTIONS S (Scheduled)                         SHUTTING               COMMENTS 2
DOWN 2       020603           F           35.8        A             3         A valve positioner air manifold failed resulting in a loss of air to the operator of a main feedwater regulating valve. The valve closed causing an automatic reactor trip on low-low steam generator water level. Refer to NRC Event Number 38961, Licensee Event Report 1 2002-004 2       020605            F          15.7        A             4         Liquid was discovered in the belly of the main generator. The unit was rapidly ramped from 23 15%, then the main generator was tripped.
The reactor remained at Mode 1, above 8 %
reactor power. Therefore, this event is counted for the "duration" off-line but not as a shutdown of the reactor.
: 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) 1}}