NRC-14-0044, Startup Report Following Measurement Uncertainity Recapture (Mur) Power Uprate
| ML14183B574 | |
| Person / Time | |
|---|---|
| Site: | Fermi  |
| Issue date: | 07/02/2014 |
| From: | Conner J DTE Energy |
| To: | Document Control Desk, NRC/RGN-III |
| References | |
| NRC-14-0044 | |
| Download: ML14183B574 (16) | |
Text
J Todd Conner Ste Vice President DTE Energy Copany
- 400 N DLie HFighway, Newport, MI 48166 Tel: 784.586 484 Far 734.586.529 Emil: Coneijdeeery.com DTE Ernergy-July 2, 2014 NRC-14-0044 U.S. Nuclear Regulatory Commission Attention: Document Control Desk Washington, D.C. 20555-0001
References:
- 1) Fermi 2 NRC Docket No. 50-341 NRC License No. NPF-43
- 2) NRC Letter to DTE Electric Company, "Fermi 2 - Issuance of Amendment Re: Measurement Uncertainty Recapture Power Uprate (TAC No. MF0650)," dated February 10, 2014
Subject:
Startup Report Following Measurement Uncertainty Recapture (MUR) Power Uprate In accordance with the Fermi 2 Technical Requirements Manual (TRM) section TR 5.2.1, "StartupReport," the attached report summarizes plant startup and power escalation testing following implementation of Fermi 2 License Amendment 196 (issued via Reference 2), which involved an increase of approximately 1.64 percent in rated thermal power.
Should you have any questions or require additional information, please contact Mr.
Zackary W. Rad of my staff at (734) 586-5076.
Sincerely,
Enclosure:
Startup Report Following MUR Power Uprate cc: NRC Project Manager NRC Resident Office Reactor Projects Chief, Branch 5, Region III Regional Administrator, Region III Michigan Public Service Commission Regulated Energy Division (kindschl@michigan.gov)
Enclosure to NRC-14-0044 Fermi 2 NRC Docket No. 50-341 Operating License No. NPF-43 Startup Report Following Measurement Uncertainty Recapture (MUR) Power Uprate
Enclosure to NRC-14-0044 Page 1 Fermi 2 Startup Report 1.0 Summary This report is submitted in accordance with the requirement of the Fermi 2 Technical Requirements Manual (TRM) section TR 5.2.1, "Startup Report." This report summarizes plant startup and power ascension testing following implementation of Fermi 2 License Amendment 196, Measurement Uncertainty Recapture (MUR) Power Uprate, involving a planned increase in power level. The MUR Uprate involves an increase of approximately 1.64 percent in rated thermal power, making the Fermi 2 current licensed thermal power (CLTP) equal to 3486 MWt.
Plant testing for the MUR Uprate was completed as described in Section 10.4, "Testing," of the Safety Analysis Report for Fermi Generating Station Unit 2 Thermal Power Optimization (TSAR) (Reference 1). MUR Uprate testing during power ascension was completed as an Infrequently Performed Tests or Evolutions (IPTE). No adjustments were required to control systems. All systems performed in a stable manner during the transient testing. The unit is operating well at uprated conditions. No corrective actions were required to obtain satisfactory operation. 100% MUR power level was first achieved on May 5, 2014.
1.1 Purpose As described in the TRM, the startup report addresses each of the tests identified in Subsection 14.1.4.8 of the Fermi 2 UFSAR. The report includes a description of the measured values of the operating conditions and characteristics obtained during the test program. MUR Uprate testing was completed as described in the Section 10.4, "Testing," of the Fermi 2 TSAR (Reference 1). This report summarizes the testing completed during power ascension after implementing the MUR License Amendment.
1.2 Acceptance Criteria Level 1 criterion is associated with the value of a process variable assigned in the design of the plant, component systems, or associated equipment. If a Level 1 criterion is not satisfied, the plant will be placed in a suitable hold condition until resolution is obtained.
Tests compatible with this hold condition may be continued. Following resolution, applicable tests must be repeated to verify that the requirements of the Level 1 criterion are satisfied.
Level 2 criterion is associated with expectations relating to the performance of systems.
If a Level 2 criterion is not satisfied, operating and testing plans would not necessarily be altered. The measurements and analytical techniques used for the predictions would be investigated.
Enclosure to NRC-14-0044 Page 2 Acceptance criteria values have been verified against current Technical Specifications.
Failure to meet established acceptance criteria must be documented within the Corrective Action Program (CAP).
1.3 Testing Requirements Each of the tests listed in Subsection 14.1.4.8 of the Fermi 2 UFSAR were evaluated for applicability for the MUR Uprate. Applicable testing requirements were evaluated in Reference 2. The Fermi 2 MUR TSAR (Reference 1) describes the evaluation of applicable testing requirements for MUR Uprate power ascension. Testing was performed and results were evaluated in accordance with the TRM section TR 5.2.1, "Startup Report," and Section 10.4 of the Fermi 2 TSAR (Reference 1).
2.0 UFSAR Subsection 14.1.4.8 Tests Not Required 2.1 Fuel Loading (UFSAR Sec 14.1.4.8.3)
The purpose of this test is to load fuel safely and efficiently to the full core size.
The MUR Power Uprate does not affect the performance of systems needed to satisfy the objectives of this test.
2.2 Full Core Shutdown Margin (UFSAR Sec 14.1.4.8.4)
The purpose of this test is to demonstrate the reactor is sufficiently subcritical throughout the fuel cycle, with any single control rod withdrawn.
Shutdown margin for Cycle 17 has been calculated per normal plant procedures and is satisfactory. The MUR Power Uprate does not affect Full Core Shutdown Margin.
2.3 Control Rod Drive System (UFSAR Sec 14.1.4.8.5)
The purpose of the CRD system test is to demonstrate that the CRD system operates properly over the full range of primary coolant temperatures and pressures from ambient to operating, and to determine the initial operating characteristics of the entire CRD system.
The MUR Power Uprate does not affect the performance of systems needed to satisfy the objectives of this test.
2.4 Source Range Monitor Performance and Control Rod Sequence (UFSAR Sec 14.1.4.8.6)
The purpose of this test is to demonstrate that the operational sources, source range monitor (SRM) instrumentation, and rod withdrawal sequences provide adequate information to achieve criticality and increase power in a safe and efficient manner. The effect of typical rod movements on reactor power will be determined.
Enclosure to NRC-14-0044 Page 3 The MUR Power Uprate does not affect the performance of systems needed to satisfy the objectives of this test.
2.5 Water Level Reference Leg Temperature Measurement (UFSAR Sec 14.1.4.8.7)
The purpose of this test is to measure the reference leg temperature and recalibrate the instruments if the measured temperature is different from the value assumed during the initial calibration.
The MUR Power Uprate does not affect the performance of systems needed to satisfy the objectives of this test.
2.6 Intermediate Range Monitor Performance (UFSAR Sec 14.1.4.8.8)
The purpose of this test is to adjust the intermediate range monitor (IRM) system to obtain an optimum overlap with the SRM and APRM systems.
The MUR Power Uprate does not affect the performance of systems needed to satisfy the objectives of this test.
2.7 Local Power Range Monitor Calibration (UFSAR Sec 14.1.4.8.9)
The purpose of this test is to calibrate the LPRM system.
The MUR Power Uprate does not affect the performance of systems needed to satisfy the objectives of this test.
2.8 Process Computer (UFSAR Sec 14.1.4.8.11)
The purpose of this test is to verify the performance of the process computer under plant operating conditions.
The MUR Power Uprate does not affect the performance of systems needed to satisfy the objectives of this test.
2.9 Reactor Core Isolation Cooling System (UFSAR Sec 14.1.4.8.12)
The purpose of this test is to verify the proper operation of the reactor core isolation cooling (RCIC) system over its expected operating pressure range.
The MUR Power Uprate does not affect the performance of systems needed to satisfy the objectives of this test.
2.10 High Pressure Coolant Injection System (UFSAR Sec 14.1.4.8.13)
The purpose of this test is to verify the proper operation of the high pressure coolant injection (HPCI) system over its expected operating pressure range.
The MUR Power Uprate does not affect the performance of systems needed to satisfy the objectives of this test.
Enclosure to NRC-14-0044 Page 4 2.11 Selected Process Temperatures (UFSAR Sec 14.1.4.8.14)
The purpose of this test is to establish the proper setting of the low speed limiter for the recirculation pumps to avoid coolant temperature stratification in the reactor pressure vessel (RPV) bottom head region, to provide assurance that the measured bottom head drain temperature corresponds to bottom head coolant temperature during normal operations, and to identify any reactor operating modes that cause temperature stratification (see Plant Parameter Monitoring and Evaluation test under MUR Uprate Tests Required below).
The MUR Power Uprate does not affect the performance of systems needed to satisfy the objectives of this test.
2.12 System Expansion (UFSAR Sec 14.1.4.8.15)
The purpose of this test is to verify that major piping of the NSSS and related auxiliary systems is free and unrestrained with regard to thermal expansion, and to verify that the thermal movement of the piping and associated support system components is consistent with the analytical predictions of the piping system stress analyses.
The MUR Power Uprate does not affect the performance of systems needed to satisfy the objectives of this test.
2.13 Turbine Valve Surveillance (UFSAR Sec 14.1.4.8.22)
The purpose of this test is to demonstrate acceptable procedures and maximum power levels for surveillance testing of the main turbine control and stop valves without producing a reactor scram.
The MUR Power Uprate does not affect the performance of systems needed to satisfy the objectives of this test. Surveillances are performed based on the applicable thermal power level (i.e. the MUR Uprate does not change the applicable thermal power level).
2.14 Main Steam Isolation Valves (UFSAR Sec 14.1.4.8.23)
The purpose of this test is to; check functionally the main steam line isolation valves (MSIVs) for proper operation at selected power levels, determine reactor transient behavior during and after simultaneous full closure of all MSIVs, and determine isolation valve closure time.
The MUR Power Uprate does not affect the performance of systems needed to satisfy the objectives of this test.
Enclosure to NRC-14-0044 Page 5 2.15 Relief Valves (UFSAR Sec 14.1.4.8.24)
The purpose of this test is to; verify that the relief valves function properly (can be opened and closed manually),
verify that the relief valves reseat properly after operation, and verify that there are no major blockages in the relief valve discharge piping.
The MUR Power Uprate does not affect the performance of systems needed to satisfy the objectives of this test.
2.16 Turbine Stop Valve and Control Valve Fast Closure Trips (UFSAR Sec 14.1.4.8.25)
The purpose of this test is to demonstrate the response of the reactor and its control systems to protective trips in the turbine and generator.
The MUR Power Uprate does not affect the performance of systems needed to satisfy the objectives of this test.
2.17 Shutdown From Outside the Control Room (UFSAR Sec 14.1.4.8.26)
The purpose of this test is to demonstrate that the reactor can be brought from a normal, initial, steady-state power level to the hot shutdown condition and to verify that the plant has the potential for being safely cooled from hot shutdown to cold shutdown conditions from outside the control room using the remote shutdown panel.
The MUR Power Uprate does not affect the performance of systems needed to satisfy the objectives of this test.
2.18 Flow Control (UFSAR Sec 14.1.4.8.27)
The purpose of this test is to; determine the correct gain settings for the individual recirculation controllers demonstrate plant response to changes in circulation flow in both local manual and master manual mode, and set the limits of range of operation for the recirculation pumps.
The MUR Power Uprate does not affect the performance of systems needed to satisfy the objectives of this test.
2.20 Recirculation System (UFSAR Sec 14.1.4.8.28)
The purpose of this test is to; verify that the feedwater control system can satisfactorily control the water level without a resulting turbine trip/scram and obtain actual pump speed/flow (see Feedwater System test under MUR Uprate Tests Required below),
verify recirculation pump startup under pressurized reactor conditions, obtain recirculation system performance data, and
Enclosure to NRC-14-0044 Page 6 verify that no recirculation system cavitation occurs in the operable region of the power flow map.
The MUR Power Uprate does not affect the performance of systems needed to satisfy the objectives of this test.
2.21 Loss of Turbine-Generator and Offsite Power (UFSAR Sec 14.1.4.8.29)
The purpose of this test is to determine the reactor transient performance during the loss of the main generator and all offsite power, and to demonstrate acceptable performance of the station electrical supply system.
The MUR Power Uprate does not affect the performance of systems needed to satisfy the objectives of this test.
2.22 Steady-State Vibration (UFSAR Sec 14.1.4.8.30)
The purpose of this test is to determine the vibration characteristics of the primary pressure boundary piping (NSSS) and engineered safety feature (ECCS) piping systems for vibrations induced by recirculation flows, hot two-phase forces, and hot hydrodynamic transients; and to demonstrate that flow-induced vibrations, similar in nature to those expected during normal and abnormal operation, will not cause damage and excessive pipe movement and vibration.
The MUR Power Uprate does not affect the performance of systems needed to satisfy the objectives of this test.
2.23 Recirculation System Flow Calibration (UFSAR Sec 14.1.4.8.31)
The purpose of this test is to perform a complete calibration of the installed recirculation system flow instrumentation.
The MUR Power Uprate does not affect the performance of systems needed to satisfy the objectives of this test.
2.24 Reactor Water Cleanup System (UFSAR Sec 14.1.4.8.32)
The purpose of this test is to demonstrate specific aspects of the mechanical operability of the reactor water cleanup (RWCU) system.
The MUR Power Uprate does not affect the performance of systems needed to satisfy the objectives of this test.
2.25 Residual Heat Removal System (UFSAR Sec 14.1.4.8.33)
The purpose of this test is to demonstrate the ability of the RHR system to remove residual and decay heat from the nuclear system so that refueling and nuclear servicing can be performed.
Enclosure to NRC-14-0044 Page 7 The MUR Power Uprate does not affect the performance of systems needed to satisfy the objectives of this test.
2.26 Piping System Dynamic Response Testing (UFSAR Sec 14.1.4.8.34)
The purpose of this test is to verify that piping system structural behavior under probable transient loadings is acceptable and within the limit predicted by analytical investigations.
The MUR Power Uprate does not affect the performance of systems needed to satisfy the objectives of this test.
3.0 MUR Uprate Tests Required MUR Uprate startup testing was completed at three test conditions, as follows:
Test Condition A (TC A) - near 3258 MWt (95% of pre-MUR Power)
Test Condition B (TC B) - near 3430 MWt (100% of pre-MUR Power)
Test Condition C (TC C) - near 3486 MWt (100% MUR Uprate Power, CLTP).
A description of each test follows. All tests were completed and all Level 1 and Level 2 acceptance criteria were met satisfactorily.
3.1 Chemical and Radiochemical (UFSAR Sec 14.1.4.8.1)
Purpose The objective of this test is to maintain control of and knowledge about the quality of the reactor coolant chemistry and radiochemistry at MUR Uprate conditions.
Description Samples were taken and measurements made at MUR Uprate test conditions TC B and TC C to determine the chemical and radiochemical quality of reactor water, reactor feedwater, and the gaseous radwaste effluent system.
Criteria Level 1 - Chemical and radiochemical parameters identified in the Technical Specifications and Fuel Warranty must be maintained within the limits specified. The activity of gaseous and liquid effluents must conform to license limitations.
Level 2 - Primary loop chemistry quality shall be known at all times and remain within the Action Level 1 guidelines of the Chemistry Specifications.
RESULTS Reactor coolant chemistry parameters as well as radioactive waste releases were maintained within the limits set forth in both the Fermi-2 Technical Specifications and the site Chemistry Specifications. Samples of reactor water, off gas, feedwater, and condensate demineralizer effluent were all maintained within the specified Level 1 and Level 2 acceptance criteria limits.
Enclosure to NRC-14-0044 Page 8 3.2 Steam Dryer/Separator Performance (Not described in Fermi 2 UFSAR)
Purpose The objective of this test is to evaluate steam dryer/separator performance at MUR conditions by measuring Main Steam Line (MSL) moisture content.
Description Measure MSL moisture content to evaluate steam dryer/separator performance at TC B and TC C. Steam dryer/separator performance (i.e., moisture carryover) is determined by analysis of main steam and reactor coolant samples. Testing near 3430 MWt permits comparison with previous operating conditions. Samples were drawn at TC B and TC C operating points and analyzed for MSL moisture content. Core radial power distribution is documented at each test condition because there is correlation between this operating parameter and the steam dryer/separator performance and MSL moisture content.
Criteria Level 1 - Not applicable.
Level 2 - MSL moisture content shall not be in excess of the steam dryer functional performance design specification value of < 0.10 wt. %.
RESULTS Moisture carryover readings were taken at TC B and TC C power levels. At TC B moisture carryover was measured to be 0.018 wt. %, and at TC C moisture carryover was 0.016 wt. %.
3.3 Radiation Measurements (UFSAR Sec 14.1.4.8.2)
Purpose The objective of this test is to monitor radiation at MUR conditions to assure that personnel exposures are maintained ALARA, that radiation survey maps are accurate, and that radiation zones are properly posted.
Description At MUR Uprate test conditions, radiation levels were monitored using installed plant area radiation monitors (ARMs) and process radiation monitors (PRMs). The 31 ARM locations included areas in the reactor building, turbine building, and auxiliary building.
The PRMs included the four main steam line radiation monitors and the off gas monitors.
Criteria Level 1 - The radiation doses of plant origin and occupancy times of personnel in radiation zones shall be controlled consistent with the guidelines of the standards for protection against radiation outlined in 10CFR20.
Level 2 - Not applicable.
Enclosure to NRC-14-0044 Page 9 RESULTS The four main steam line monitors indicated an increase of between 2 and 6% when reactor power was increased from TC B to TC C; this small increase was expected. The remaining PRMs and ARMs did not indicate significant changes. Based on the observed results, radiological postings are not impacted and no additional surveys were determined to be necessary. Radiation doses and occupancy times of personnel continue to be consistent with the guidelines of the standard for protection against radiation outlined in 10CFR20.
3.4 Average Power Range Monitor (APRM) Calibration (UFSAR Sec 14.1.4.8.10)
Purpose The objective of this test is to calibrate the APRM system to the MUR Uprate power level.
Description Each APRM channel reading was adjusted to be consistent with the core thermal power, referenced to MUR Uprate power level, as determined from the heat balance. APRM trip and alarm setpoints were calibrated for the MUR Uprate power level.
Criteria Level 1 - The APRM channels must be calibrated consistent with Technical Specifications. Technical Specifications and Fuel Warranty limits on APRM scram and rod block setpoints shall not be exceeded.
Level 2 - Not applicable.
RESULTS APRM calibrations were performed at the MUR Uprate power level. APRM calibrations were completed satisfactorily and the APRM scram and rod block set-points were not exceeded.
3.5 Core Performance (UFSAR Sec 14.1.4.8.17)
Purpose The objective of this test is to; evaluate the core thermal power and core flow, and evaluate whether core performance parameters are within limits to ensure a careful, monitored approach to MUR Uprate power level.
Description Routine measurements of reactor and system parameters are taken near TC A and TC B along the constant flow control/rod pattern line that was used to increase power to near 3486 MWt (MUR power level, Test Condition C). Core thermal power measurements were performed using the heat balance methods indicated in Reference 1. Core
Enclosure to NRC-14-0044 Page 10 performance parameters were calculated using accepted methods to ensure current licensed and operational practice are maintained. Fuel thermal margin and other core performance parameters were projected to the 3486 MWt power level from the 3430 MWt test conditions. Power increase above 3430 MWt was along a constant flow control/rod pattern line in one increment to 3486 MWt. Measured reactor parameters and calculated core performance parameters at 3486 MWt are evaluated by comparison to limits specified in Technical Specifications and projected values.
Once steady-state conditions were established at each test condition, reactor measurements were taken, and core thermal power and core performance parameters were calculated. MUR Uprate values for fuel thermal margin and other core performance parameters were projected from the TC B test conditions. At MUR Uprate power level, reactor parameters and core performance parameters were evaluated against Technical Specification limits and projected values.
Criteria Level 1 - The following Level 1 criteria apply to this test:
All core performance parameters shall be within the limits specified in Technical Specifications, i.e.;
o Core Maximum Average Planar Linear Heat Generation Rate Ratio (CMAPRAT) o Maximum Fraction of Limiting Power Density (CMFLPD), and o Core Maximum Fraction of Limiting Critical Power Ratio (CMFLCPR).
Steady state reactor power shall be limited to maximum value of the lesser of either MUR Uprate power level or the MELLLA Boundary as indicated on the Power/Flow Map.
Core flow shall not exceed its maximum value depicted on the Power/Flow Map.
Level 2 - Not applicable.
RESULTS With a constant control rod pattern, Test Conditions A, B, and C were achieved by increasing core flow only. During the test conditions core monitor cases were run frequently to monitor core performance parameters, ensuring they remained within the Technical Specifications throughout the approach to the MUR Uprate power level. Prior to proceeding to each Test Condition, core monitor prediction calculations were run to assure core performance and Technical Specification values would be as expected.
Values for each of the core performance parameters at each of the test conditions are given below. Technical Specification requirements were met satisfactorily.
Enclosure to NRC-14-0044 Page 11 Core Performance Test Condition A Test Condition B Test Condition C Parameter CMFLCPR 0.842 0.827 0.823 CMFLPD 0.795 0.808 0.814 CMAPRAT 0.619 0.633 0.636 Steady state reactor power and core flow are maintained within the bounds of the Power to Flow Map in accordance with plant operating procedures. The Maximum Fraction of Limiting Critical Power Ratio (MFLCPR), Maximum Fraction of Limiting Power Density (MFLPD), and Maximum Average Planar Linear Heat Generation Rate Ratio (MAPRAT) were calculated in Test Conditions A, B, and C, and remained within the specified limits.
3.6 Pressure Regulator (UFSAR Sec 14.1.4.8.20)
Purpose The objective of this MUR Uprate test is to confirm the adequacy of the pressure control settings for MUR Uprate operations by inducing transients in the reactor pressure control system using the pressure regulators.
Description Turbine Pressure Controller Setpoint: Prior to commencing MUR Uprate baseline testing (Test Condition A), the turbine pressure controller setpoint was adjusted to achieve desired reactor pressure when projected to MUR Uprate conditions and then held constant throughout the MUR Uprate power ascension. This provides the most meaningful evaluation of turbine steam flow margin at MUR conditions. With the small MUR Uprate power change, holding the turbine pressure controller setpoint constant establishes a consistent basis for measuring the performance of the reactor and the Turbine Control Valves (TCVs) as they open during the MUR power ascension.
Achieving normal operating reactor dome pressure in the MUR test condition permits direct evaluation between pre-MUR and MUR Uprate operating conditions.
Pressure Regulator Testing: This testing had the potential to produce core power excursions due to the vessel pressure changes. The power levels of these operational transients have the potential to exceed the steady-state power level of the test condition.
A margin to MUR Uprate power level, based on the power excursions experienced in the earlier testing, was established in the final MUR Uprate test condition to avoid exceeding the licensed thermal power limit during testing.
In each test condition, testing of the pressure control system response to pressure setpoint step changes was accomplished by first making a down setpoint step change, followed by an up setpoint step change after conditions stabilize (first -3 psi, then +3 psi). When testing was completed for one pressure regulator, the other pressure regulator was selected and the pressure setpoint step testing was repeated.
Enclosure to NRC-14-0044 Page 12 Criteria Level 1 - The decay ratio must be less than 1.0 for each process variable that exhibits oscillatory response.
Level 2 - The following Level 2 criteria apply to this test; The decay ratio must be less than or equal to 0.25 for each process variable that exhibits oscillatory response.
Pressure control system deadband, delay, etc., shall be small enough that steady state limit cycles, if any, shall produce turbine steam flow variations no larger than +/- 0.5% of rated flow.
RESULTS Pressure Regulator stability testing was performed at Test Condition A, B, and C power levels. Data obtained during each test is provided in the tables below. The system responded as expected, and the Level 1 and 2 acceptance criteria were satisfied. The steady state limit cycles at each of the three test conditions are provided in the table below. Level 1 and Level 2 acceptance criteria were met satisfactorily.
Maximum Time to Controlling Test Step Size (psi) Peak Pressure Pressure Regulator Condition (seconds) 1 A -3, +3 8 2 A -3, +3 5 1 B -3, +3 8 2 B -3, +3 5 1 C -3, +3 8 2 C -3, +3 9 Test Condition Steady State Limit Cycles (MWe)
A 9.5 B 8.0 C 9.6 3.7 Feedwater System (UFSAR Sec 14.1.4.8.21)
Purpose The objective of this MUR Uprate test is to verify the feedwater control system has been adjusted to provide acceptable reactor water level control for MUR operating conditions.
Enclosure to NRC-14-0044 Page 13 Description The Feedwater Control System Testing has the potential to produce core power excursions due to feedwater addition. The power levels of these operational transients may exceed the steady-state power level of the test condition, therefore a margin to MUR Uprate power level, based on the power excursions experienced in the earlier testing, was established in the final MUR test condition to avoid exceeding licensed thermal power during testing.
At each test condition reactor water level setpoint changes are introduced into the feedwater control system in the following sequence: - 3 inches; + 3 inches.
The normal feedwater control system mode is three-element control, with single element control only being used for temporary backup situations. The feedwater control system in three-element control mode was adjusted for stable operational transient level control (i.e., decay ratio). In single element control mode, the system adjustments achieve the operational transient level control criteria. Test modes included three-element and single-element modes, at TC A, TC B, and TC C, under automatic reactor recirculation mode.
Criteria Level 1 - The decay ratio must be less than 1.0 for each process variable that exhibits oscillatory response.
Level 2 - The decay ratio must be less than or equal to 0.25 for each process variable that exhibits oscillatory response.
RESULTS The Feedwater level control settings were verified to achieve the operational transient level control criteria (i.e. decay ratio) in three-element and single-element control modes.
The system responded to the level transients as expected with no signs of divergence or oscillation. The Level 1 and 2 acceptance criteria were satisfied.
3.8 Plant Parameter Monitoring and Evaluation (Not described in Fermi 2 UFSAR)
Purpose The objective of this test is to evaluate whether power-dependent plant parameters remain within limits to ensure a careful, monitored approach to the MUR Uprate level. The power-dependent parameters monitored are those balance-of-plant (BOP) systems and equipment with potential to be affected by the MUR Uprate power increase.
Enclosure to NRC-14-0044 Page 14 Description Routine measurements of the power-dependent parameters (i.e., pressures, temperatures, flows, and selected major rotating equipment vibration) of systems and equipment affected by the MUR Uprate, are taken at TC A and TC B. Parameters were calculated using accepted methods to ensure current licensed and operational practices are maintained. Once the MUR Uprate power condition (near 3486 MWt) is achieved (TC C), each actual value was evaluated against operational limits and its predicted value to confirm the change, as expected with the MUR Uprate power increase, is acceptable.
Criteria Level 1 - Routine measurements of reactor and system pressures, flows, and vibration will be evaluated based on plant operating experience. Test condition parameter measurements must be within expected ranges based on comparisons with pre-MUR parameter measurement data and system/equipment operational records.
Level 2 - Not applicable.
RESULTS System monitoring was performed at each of the test conditions on over 150 distinct BOP system/equipment parameters. All power-dependent parameters were confirmed to be within expected ranges at each of the power levels. No unexpected operational parameter fluctuations were identified. All acceptance criteria related to power dependent system parameters were satisfied.
References
- 1. NEDC-33578P, Revision 2, "Safety Analysis Report for Fermi Generating Station Unit 2 Thermal Power Optimization," (Enclosure 2 of DTE letter NRC-13-0045, "Update to Measurement Uncertainty Recapture Power Uprate License Amendment Request TSAR,"
dated 9/27/13).
- 2. Project Task Report, Fermi-2 Thermal Power Optimization, Task T1005: Startup Test Specifications (DTE DSN: MURFTRT1005)