ML20236R325

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Monthly Operating Rept for June 1998 for DAEC
ML20236R325
Person / Time
Site: Duane Arnold NextEra Energy icon.png
Issue date: 06/30/1998
From: Woodward R
IES UTILITIES INC., (FORMERLY IOWA ELECTRIC LIGHT
To:
Shared Package
ML20236R323 List:
References
NUDOCS 9807210365
Download: ML20236R325 (5)
v • d • e


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, . OPERATING DATA REPORT DOCKET NO: 50-0331 j DATE: 07/15/98 Unit: Duane Arnold Energy Center l

COMPLETED BY: Richard Woodward j TELEPHONE: (3191 851-7318 OPERATING STATUS Unit Name: Duane Arnold Enercy Center

2. Reporting Period: June 1998 Average Daily Power Level
3. Licensed Thermal Power (MWth): 1658 500 E 400
4. Nameplate Rating (Gross MWe DER): 565.7 (Turbine)  % 300  ;
5. Design Electrical Rating (Net MW eDER): 13.8.-

00 0

6. Maximum Dependable Capacity (Gross ' VeMDC): }5._0 5 1 6 11 16 21 26
7. Maximum Dependable Capacity (Net MW, MDC): 120 Day S. If Changes Occur in Capacity Ratings (ltems Number 3 through 7) since the last report, Give Reasons: Eat Applicable i
9. Power Level to Which Restricted, If Any (Net Mw ):e E/_A._
20. Reasons for Restrictions,If Any:EM June-98 1998 Cumulative
11. Hours in Reporting Period 720.0 4,343.0 205,223.0
12. Number of Hours Reactor Was Critical 720.0 3,263.8 158,030.3 1
13. Rractor Reserve Shutdown Hours 0.0 0.0 192.8
14. Hours Generator On-Line 720.0 3,178.2 154,327.3

'4 Unit Reserve Shutdown Hours 0.0 0.0 0.0

, I o. Gross Thermal Energy Generated (MWH) 1,187,469.6 5,090,601.6 219,796,643.8 il7. Gross Electrical Energy Generated (MWH) 391,836.0 1,710,138.0 73,702,824.6 l18. Net Electrical Energy Generated (MWH) 369,664.1 1,612,988.4 69,184,076.6 l19. Unit Service Factor 100.0 % 73.2 % 75.2 %

30. Unit Availability Factor 100.0 % 73.2 % 75.2 %

70.9 %

@l. Unit Capacity Factor (Using MDC Net) 98.7 % 71.4 %

$2. Unit Capacity Factor (Using DER Net) 95.4 % 69.0% 67.9 %

$3. Unit Forced Outage Rate 0.0% 0.0% 9.6%

14. Shutdowns Scheduled Over Next 6 Months (Type, Date, and Duration of each): E/A 85, if Shutdown at End of Report Period, Estimated Date of Startup:E/6 9807210365 980715 PDR R

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. AVERAGE DAILY UNIT POWER LEVEL DOCKET NO: j000

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DATE: 07/15/98 Unit: Duane Arnold Enercy Center COMPLETED BY: Richard Woodward TELEPHONE: (319) 851-7318 MONTH June 1998 Day Average Daily Power Level (MWe-Net) 1 525.2 2 521.5 3 526.7 4 527.4 5 523.3 6 524.4 7 525.3 8 518.4 9 517.2 10 516.9 11 512.0 12 516.1 13 500.1 14 466.2 15 516.5 16 514.3 17 514.4 18 511.5 19 510.9 20 513.0 21 513 3 22 512.7 23 509.6 24 504.1 l 25 511.8 26 502.4 27 501.8 l 28 513.5 29 514.7 30 518.0

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REFUELING INFORMATION

. . DOCKET NO: 50-0331 DATE: 07/15/98 Unit: Duane Amold Enercy Center j COMPLETED BY: Richard Woodward TELEPHONE: (3191 851-7318

1. Name of facility. Duane arnold Enercy Center
2. Scheduled date for next refueling shutdown. October 8.1999
3. Scheduled date for restart following refueling. November 13.1999
4. Will refueling or resumption of operation thereafter require a technical specification change or other license amendment? N_Q
5. Scheduled date(s) for submitting proposed licensing action and supporting information.

N/A

6. 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. N/A
7. Current and projected fuel assemblies inventory:

Number of Projected date oflast Fuel refueling that can be discharged Assemblies (after allowing margin for maintenance of continuous full-core

! discharge capability)

Installed in reactor core I 368 n/a Previously discharged from core to Spent F.uel Storage Pool  ! 1648 n/a Installed Capacity of Spent Fuel Storage Pool  ! 2411 2001 Licensed Capacity of Spent Fuel Storage Pool (with reracking) 2829 J 2006 Licensed Capacity of Spent Fuel Storage Pool and Cask Pool (with l 3152 2010 reracking) I j i

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(* DOCKET NO: so-03)1 DATE: 07/15/98 '

j , . Unit: Duane Arnold Enerev Center

[ COMPLETED BY: Richard Woodward TELEPHONE: (319) 851-7318 i

UNIT SHUTDOWNS AND POWER REDUCTIONS REPORTMONTH: June 1998 l (There were no power reductions > 20% during the month.)

No. Date Type Duration Reason Method of Licensee Cause (1) (Hours) (2) Shutting Event -

Down Reactor Report #

(3)

I - F: Forced 2 - Reason 3 - Method:

S: Scheduled A-Equipment Failure (Explain) 1 Manual

B-Maintenance or Test 2-Manual Scram C-Refueling 3 Automatic Scram D-Regulatory Restriction 4-Continued E-OperatorTraining & License Examination S-Reduced Load F-Administrative 9-Other(Explain) -

G-Operational Error (Explain) t H-Other (Explain) l l

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    • DOCKET NO.: 50-0331 DATE: 07/15/98 Unit: Duane Amold Energy Center COMPLETED BY: Richard Woodward TELEPHONE: (319) 851-7318 Monthly Operational Overview for June 1998 At the beginning of June, the DAEC was 10 days into Operating Cycle 16, having just returned to full-power operation

. following a two-day 50% power reduction to repair an oil leak on 'A' Feedwater Pump Motor. During the month the DAEC operated at its 1658 MW. licensed limit except for the following departures from full-power: t I

Allocation of Production and Losses Electric Capacity Factor Full Power 1 Output  % of 565.7 MWe Equivalent MWe (Design Rating) Hours (FPHeq) 06/05 12:10 - 12:30 Reduced recirculation flow to pull control rods to increase load line (Rod Pull) 0.1 06/11 08:30- 16:20 Calibrate Feed Flow Transmitters 0.4 06/13 21:00 6/14 16:40 Sequence Exchange 3.6 06/16 00:45 - 01:50 Rod Pull 0.1 06/19 00:00 - 03:55 Rod Pull 0.3 06/27 00:00 01:00 Rod Pull 0.1 06/28 01:00 - 02:00 Rod Pull 0.1 06/28 09:21 10:23 HPCI Run 0.1 Average Margin to 1658 MWth Limit J O

Subtotal: Capacity Losses l 3.7 l 0.7% 5.0 06/01 00:00 - 06/27 06:00 Turbine By-Pass Valve dumping to Main Condenser (steadily increasing from 3.8 1 to 5 MWe) 06/01 00:00 - 06/11 16:40 Feedwater Flow Transmitter out of calibration (1 MWe) 0.6 06:01 00 00 - 06/30 24:00 Main Steam Line Drain Valve dumping to Main Condenser (1 MWe) 0.6 throughout June 'B' Moisture Separator Reheater Performance Loss (1 MWe) 1.0 throughout June Feedwater flow measurement no721e fouling (average 2% MWe) 2.9 throughout June Other Losses, as yet unidentified (3 MWe) M Subtotal: Efficiency Losses 10.1 1.8% 12.8 Weather Losses 7.5 1.3% 9.5 Total Losses 2L3 38% 23 2

Actual Metered Net Electric Output 513.4 90.8 % 653.5 Actual Metered Plant Electric Loads (while on-ime) 30 8 54% 36.2 Total Electric Generation 543 4 96.2 % 692.7 565.7 100.0 % 720.0 On May 5,1998, as a result of engineering reviews, it was determined that a double-ended guillotine break of the High Pressure Coolant Injection (HPCI) steamline could have resulted in room pressures above the value at which the HPCI toom corridor wall would begin to yield. The as-found condition of the wall has been considered to conflict with a

- statement in the Updated Final Safety Analysis Report regarding compartment pressure analysis modeling and has been interpreted as a condition that was outside the design basis of the plant. The cause of the event was an incorrect assumption in the original HPCI High Energy Line Break (HELB) analysis.

Corrective action included a modification to the wall which added lateral supports to restore design margin. The plant was shutdown and in a refueling outage at the time of discovery. An evaluation of the effect of the as-found condition of l

the wall during a HELB determined that environmental conditions of surrounding areas remained mild, there was no

! ' operability impact on safety-related equipment, and there was no impact on the ability of the plant to achieve and maintain safe shutdown. Therefore, there were no actual or potential safety consequences as a result of this condition.

, (LER 98-07)

Licensine Action Summary:

Plant Availability 100.0 % Unplanned Auto Scrams (while/ critical) this month: 0 i Number of reportable events: 1 Unplanned Auto Scrams (while/ critical)last 12 months: 0 Main Steam Safety and Relief Valve Challenges: 0 i

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