ML20214U334

Cycle 6 Startup Physics Test Rept

ML20214U334
Person / Time
Site:	Beaver Valley
Issue date:	09/30/1986
From:	Burger A, Druga R, Jones T DUQUESNE LIGHT CO.
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ML20214U307	List: ML20214U305 ML20214U334
References
NUDOCS 8612090231
Download: ML20214U334 (9)

Text

. . DUQUESNE' LIGHT COMPANY BEAVER VALLEY POWER STATION UNIT 1 CYCLE 6' STARTUP PHYSICS TEST REPORT September, 1986

• i Prepared by: [.[ d, A. R. Burg Core Performance Engineer Reviewed by:

v A////,,;4 Approved by: -

,h h R. J. Druga T. D. Jones Acting Plant Manager General Manager Nuclear Operations 8612090231 a61120 4 DR ADOCK 0500

BEAVER VALLEY POWER STATION Cycle 6 Startup Test Report INTRODUCTION:

This report describes the startup tes t program applicable for the Cycle 6 reload core design verification for Beaver Valley Power Station, Unit 1. This tes ting program consisted of the following measurements conducted from August 18, 1986 through September 8,1986:

1. Control rod drop time measurements

2. Initial criticality

3. Critical boron concentration measurements

4. Control bank worth measurements

5. Temperature coefficient measurements

6. Reactivity computer checks

7. 30% power symmetry check

8. Incore/Excore cross-calibration

9. Power distribution measurements at 75% and 100% power The results of these startup tests are summarized in this report and comparisons are made to predicted design values and applicable BVPS Technical Specification Requirements.

Beaver Valley Power Station Cycle 6 Startup Test Report Page 2 TEST SUMMARIES:

BVT 1.1 - 1.1.1 " Control Rod Drop Time Measurements" PURPOSE:

The purpose of this test was to determine a drop time for each full-length Rod Cluster Assembly with the RCS in Hot Standby, Tavg > 541* F, and full RCS fl ow.

TEST DESCRIPTION:

A single RCCA Bank is withdrawn to the full-out position (228 steps). A visicorder is connected to the detector primary coil and test leads are then inserted at the stationary gripper coil jacks in the power cabinets. The RCCA blown fuse indicator and moving coil fuse are removed. After the visicorder is turned ON, an assembly is dropped by pulling the stationary gripper fuse out.

Each of the 48 rod cluster assemblies is tested in this manner and the drop times are determined from the visicorder traces. .

RESULTS :

The test was started at 0555 on August 18, 1986 and completed at 1759 on Augus t 18, 1986. The drop times of all 48 rods were well within the BVPS Technical Speci fica tion Requi rement of < 2.2 seconds, with the slowest time being 1.37 seconds for rods K-14, B-6, and F-8 at hot full RCS flow.

Beaver Valley Power Station Cycle 6 Startup Test Report Page 3 BVT 1.6 - 2.2.1 " Initial Approach to Criticality" PURPOSE:

The purpose of this test was to (1) achieve initial criticality; (2) determine the point at which nuclear heat occurs and establish the zero power physics testing decade; (3) verify the proper calibration of the reactivity computer.

TEST DESCRIPTION:

Ini tial conditions were established with the shutdown banks fully withdrawn, control banks fully inserted, boron concentration 1943 ppm, RCS temperature at ~

547 *F and RCS pressure at 2235 psig on August 24, 1986 at 0840.

The control ba nks were withdrawn in 50 step intervals until Control Bank D reached 160 steps. An inverse count rate ratio (ICRR) was taken at each interval. During control rod withdrawal, the ICRR dropped from 1.0 to approximately 0.42.

Dilution to criticality was then commenced at 1005 at a rate of approximately 1000 pcm/hr. Again, ICRR was monitored and plotted at 20 minute intervals. At 1415 on August 24, 1986 af ter 12,923 gallons had been added criticality was achi ev ed.

Following the recording of criticality data at g440, power was increased toward nuclear heat. Nuclear heat occurred at 7 x 10 - amps as indicated on the Th reactivit4 2.9 x 10- computer. amps to 7 x on amps 10-g thezero power reactivity physics testing band (ZPPTB) was computer.

A reactivity computer operational checkout was then performed using the reactor with positive reactivity insertions of 25 pcm, 34 pcm , and 56 pcm. The doubling times were measured and predicted reactivity compared to measured for each insertion. BVT 1.6-2.2.1 was completed at 1955 on August 24, 1986.

RESULTS:

The all rods out ( AR0) critical boron concentration corrected for rod position was calculated to be 1538 ppm with an acceptance criteria of 1504 +~ 50 ppm.

Thus, the inferred value was within the acceptance criteria.

The ZPPTB was set at 2.9 x 10-9 amps to 7 x 10-8 amps based on a measured nuclear heating point of 7 x 10-7 amps and background reading of 2.9 x 10-10 amps.

All the test runs fo r the reactiv i ty computer were within the acceptance criteria of 4%. The errors for the three test cases were 0.60%, 2.35% and 2.30%

'. Beaver Valley Power Station Cycle 6 Startup Test Report

. Page 4 BVT 1.6-2.2.2 " Core Design Check Test" PURPOSE:

The purpose of this test was to verify the reactor core design data between 0 and 100 percent power, and to perform the incore/excore cross-calibration prior to exceeding 75% reactor power.

TEST DESCRIPTION:

The test was divided into five parts: -

Section A cov ered zero power physics tes ts. These tests included boron endpoint measurements, boron dilution worth measurement of the reference bank (CBB), rod .=wsp ba nk worths, di f ferential L,oron worth, and a isothermal temperature coefficient measurement.

Section B involved verifying core symmetry by performing a full-core flux map prior to exceeding 30% reactor power.

Section C requi red incore/excore calibration prior to exceeding 75% of rated thermal power. This involved performing BVT 1.3-2.2.3, " Nuclear Power Range Cal i b ra t io n" , in which a series of flux maps are run at various axial offsets.

Section D required a full-core flux map to be obtained between 40% and 75%

reactor power to ensure that the measured peaking factors were within their applicable Technical Specification limits.

Finally, Section E involved perfonning a full-core flux map at 100% reactor power. This map served as a celibration check for the incore/excore calibration and veri fied that the power distribution limits of the Technical Specifications were not exceeded.

RESULTS:

Boron Endpoint:

The all rods out ( AR0) critical boron concentration was measured to be 1526.6 ppm at 2241 on August 24, 1986. This val ue was within the acceptance criteria of 1504150 ppm.

The Control Bank B-in cri tical boron concentration was measured to be 1373.3 ppm at 0532 on August 25, 1986. This value was within the acceptance criteria of 1325 ppm _t 15%.

Beaver Valley Power Station j

- Cycle 6 Startup Test Report i Page 5 l Temperature Coefficients The isothermal tempe rature coefficient (ITC) was measured at AR0, HZP conditions on August 24, 1986 at 2354. The average measured ITC was detennined to be -2.96 pcm/* F which was within the acceptance cri teria of -2.59 + 3 pcm/* F. Subtracting out the predicted design v al ue of the dopple r coef ficient (-2.12 pcm/

• F) from the measured ITC, the MTC was calculated to be -0.84 pcm/

• F. This value for the MTC meets the requirements of BVPS Technical Specifications which require the MTC to be between -50 pcm/ F and 0 pcm/* F.

Dif ferential Boron Worth The measured di f fe rential boron worth was 8.15 pcm/ ppm. This value was within the acceptance criteria of 7.54 pcm/ ppm + 15%.

RCC Bank Worths The boron dilution measurement of the reference bank for rod swap, CBB was completed at 0352 on August 25, 1986. Following the insertion of CBB, the worths of the remaining control and shutdown banks were obtained relative to CBB on August 25, 1986, between 0726 and 0932. The measured worth, predicted value, and percent difference for each RCC bank and total RCC worth are listed in Table I. All the measured values were within the acceptance criteria for this test.

Reactivity Computer The reactiv ity computer was checked prior to low power physics testing (LPPT), every 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> during testing, and at the conclusion of LPPT using the exponential generato r. In addition, the reactivity cortputer was checked with the reactor following initial criticality. In all ca ses the computer error was within the 4% acceptance criteria, with the highest measured error being 2.35%.

30 Percent Power Symmetry Check A full-core flux map was performed on August 28, 1986 at approximately 30%

power with CBD at 178 steps to determine the initial flux distribution in the core. Table II lists the values measured for cuadrant power tilt, nuclear enthalpy hot channel factor (F N ), and maximum deviation from predicted relative assembly powers. AH A slight core tilt was measured during this map, however a full-core flux map had already been scheduled for 75% power. All other values were within the acceptance cri teria and applicable Technical Specifications, thus it was decided to recheck the core tilt during the 75% flux map.

r Beaver Valley Power Station Cycle 6 Startup Test Report Page 6 75 Percent Power Flux Map and Incore/Excore Calibration On August 31, 1986 and September 1,1986, BVT 1.3-2.2.3, " Nuclear Power Range Calibration", was performed (at 75% power). This test involved a full-core and six quarter-core flux maps performed at various axial offsets to calibrate the excore detectors and verify core peaking facto rs. The results from these maps were all well within the applicable Technical Specifications as illustrated in Table II.

100 Percent Power Flux Map A full-core flux map was performed at 100% power on September 8,1986.

This map served as a check for the incore/excore calibration saa power distribution limits. Again, all measured peaking factors were within the BVPS Technical Specifications as Table 11 snows.

This 100% flux map marked the completion of the reload startup test program for Beaver Valley Power Station, Unit I, Cycle 6.

Beaver Valley Power Station

. Cycle 6 Startup Test Report Page 7 TABLE I CONTROL R0D BANK WORTHS Control Measured Predicted Error Acceptance Bank Value (pcm) Value (pcm) (%) Criteria CBB* 1249.0 1349 -7.41 110%

CBD 1072.2 1154 -7.09 il5%

CBC 797.6 833 -4.25 15%

CBA 596.1 624 -4.47 115%

SBB 963.7 1014 -4.96 il5%

SBA 1006.3 1080 -6.82 - 115%

TOTAL WORTH 5684.9 6054 -6.10 10%

• Reference Bank i

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• Beaver Valley Power Station Cycle 6 Startup Test Report Page 8 e

TABLE II ,

FULL CORE FLUX MAPS 4

30% Power 75% Power 100% Power CBD = 178 steps CBD = 193 steps AR0 Acceptance Criteria Quadrant Tilt 1.0210 1.0149 1.0121 11.02 For power ,

above 50%

Maximum Deviation 4.8% 4.5% 3.2% t 10% of Predicted for from Predicted Relative Power > .9 Assembly Powers t

Tech. Spec. :

< 1.87 for 30%

FN 1.4670 < 1.67 for 75%

~

All 1.5680 1.4968

< 1.55 for 100%

Tech. Spec.:

<4.6168 for 30%

F 1.8526 < 3.1152 for 75%

Q 2.1348 1.9604

< 2.3154 for 100%

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