ML20035G733

Startup Test Rept, Cycle 12

ML20035G733
Person / Time
Site:	Millstone
Issue date:	03/31/1993
From:	NORTHEAST NUCLEAR ENERGY CO.
To:
Shared Package
ML20035G732	List: ML20035G731 ML20035G733
References
NUDOCS 9304290167
Download: ML20035G733 (15)

Text

. _ _ _ _ - _ _ _ _ _ _

Docket No. 50-336 MILLSTONE NUCLEAR POWER STATION UNTT NO. 2 STARTUP TEST REPORT CYCLE 12 l

I h1 ARCH 1993 9304290167 930419 PDR ADOCK 05000336 P

PDR

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Page 1 l

l 1

INDEX l

1.

SUMMARY

2 2.

INTRODUCTION 2

1 3.

LOW POWER PHYSICS TESTING RESULTS

'2 3.1 Unrodded Critical Boron Concentration 3

3.2 Unrodded Moderator Temperature Coefficient 3

3.3 Control Element Assembly Rod Worth Parameters 4

i l

3.4 Rodded Critical Boron Concentration 4-3.5 Control Rod Drop Time Measurements 5

l 4.

POWER ASCENSION TESTING -

5 4.1 Power Peaking, Linear Heat Rate, Incore Tilt 5

j 4.2 Critical Boron Measurements 5.

)

4.3 Flux Symmetry Measurements 6

' 4.4 Shape Annealing Factor Test 6

4.5 Moderator Temperature Coefficient 7

4.6 Doppler Only Power Coefficient 7

4.7 Reactor Coolant System Flow 7

4.8 Power Distributions S

4.9 Reactor Coolant Sys'em Radiochemistry 8

5.

REFERENCES S

6.

FIGURES S

i Figure 1 - Cycle 12 Core Loading Map 10 Figure 2 - CEA Group Configuration 11 l

Figure 3 - Xenon Oscillation at 65% Power 12 i

Figure 4 - 65% Power Distribution Map 13 Figure 5 - 100% Power Distribution Map 14 l

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i Page 2 l

1.

SUMMARY

l l

The steam generators were replaced during the refueling outage preceding the l

Cycle 12 startup. The replacement of the original steam generators was necessary due to extensive damage and the subsequent repairs and plugging of defective tubes.

The results of the Millstone 2, Cycle 12 low power physics and power ascension testing programs were in good agreement with the core design predictions with l

one exception. The original acceptance criteria for the unrodded and rodded critical boron concentration was 50 ppm of the predicted value. During performance of the low power physics tests it was determined that the measured critical boron concentrations were approximately 65 ppm greater than the predicted value. The fuel supplier, Siemens Nuclear Power Corporation, was contacted to review these results for errors in the predictions and for potential l

impacts on the reload safety analyses. Siemens confirmed that no errors were revealed in the review of the startup physics calculations, and that there was no impact to the reload safety analyses due to the measurement differences.

2.

INTRODUCTION The Millstone 2 Cycle 12 fuel loading was completed on November 29,1992.

The attached core map (Figure 6.1) shows the final core loading. The subsequent operation / testing milestones were completed as follows:

Initial Criticality January 10,1993 j

Low Power Physics Testine Completion January 12,1993 Turbine On-Line January 13,1993 Completed 65Fc Power Testing January 20,1993 Completed 96G Power Testing January 24, 1993 Completed 100Fc Power Testing January 27,1993 i

The Millstone 2 Cycle 12 core is comprised of 13 Westinghouse manufactured fuel assemblies and 204 Siemens Nuclear Power Corporation (SNPC) manufactured fuel assemblies. The Reload Safety Analysis is supplied by Siemens Nuclear Power Corporation.

i 3.

LOW POWER PHYSICS TESTING RESULTS Low Power Physics Testing was conducted at a power level of approximately 5 x 10-29 power.

The reactivity computer was connected only to the Channel "X" upper and lower excore detectors, as the signal from the Channel "Y" upper detector was " noisy" and was not usable.

i

• Pace 3 3.1 Unrodded Critical Boron Concentration The Critical Boron Concentration (CBC) measured with CEA Group 7 at 156 steps withdrawn was 1332 ppm. Adjusted to an All Rods Out (ARO) l condition, the measured CBC is 1339 ppm.

CBC Measured at BOL-HZP-ARO

= 1339 ppm CBC Predicted at BOL-HZP-ARO

= 1276 rinm l

l Difference 63 ppm

=

1 Acceptance Criteria is 94 ppm of the predicted Critical Boron Concentration.

(

Acceptance Criteria met? Yes 3.2 Unrodded Moderator Temperature Coefficient r

The Moderator Temperature Coefficient (MTC) measurements were l

performed at s boron concentration of 1332 ppm a temperature of 532.6*F and a CEA Group 7 position of 158 steps withdrawn.

The measured Moderator Temperature Coefficient at these conditions was l

+0.224 x 10-dap/*F. Adjusted to the prediction conditions, the measured

.TC is +0.132 x 10-4Ap!"F.

. Adjusted, MTC Measured at 532*F.

1263 ppm

= +0.132 x 10-4Ap/*F i

MTC Predicted at 532*F,1263 ppm = +0.263 x 10-4Ao/*F

-0.131 x 10-4Ap/*F Difference

=

Acceptance Criteria is 0.2 x 10-4Ap/*F of the predicted MTC.

Acceptance Criteria met? Yes l

Additiowlly, per the Millstone 2 Technical Specifications, the MTC must be less positive than +0.7 x 10-4Ap!*F for power levels less than 70Tc power.

Acceptance Criteria met? Yes l

l i

Page 4 3.3 Control Element Assembly Rod Worth Parameters Control Element Assembly (CEA) Rod Worth Parameters were performed using the Rod Swap measurement technique. CEA Group A was used as the Reference CEA Group. All of the remaining CEA groups were then swapped with Group A. Figure 6.2 shows the CEA Group confieuration.

The results of the CEA measurements were:

i Group Measured Prediction Difference 9 Difference A

0.987G Ap 1.024Fc Ap

-0.0377c Ap

-3.61 Fc B

0.516G ap 0.484Fc Ap 0.032G Ap

+6.61Fc 1

0.804Fc Ap 0.758Fc Ap 0.046G Ap

+6.07Fc 2

0.859Cc Ap 0.806G Ap 0.053% Ap

+6.5 SG j

3 0.452Fc Ap 0.465Fc Ap

-0.013rc Ap

-2.80G 4

0.670G Ap 0.722G Ap

-0.052Tc Ap

-7.20Fc 5

0.405G Ap 0.377G Ap 0.0289c Ap

+7.43G 6

0.381G Ap 0.380Fc Ap 0.001Fc Ap

+0.26Fc I

7 0.781G Ap 0.804Fc Ap

-0.023Fc Ap

-2.86G TOTAL 5.8557c Ap 5.820% Ap-0.0367c Ap

+0.60Fr i

The Acceptance Criteria is that the Reference Group worth should be l

within 10G of the predicted value.

Acceptance Criteria met for the Reference Group? Yes i

The Total CEA Worth should be within 10 Fc of the predicted value.

Acceptance Criteria met for the Total CEA Worth? Yes The Acceptance Criteria for the remaining individual CEA Groups is that the Rod Worth Parameter of the remaining individual CEA Groups should be within 15 % or 0.1FcAp (whichever is greater) of the predicted value.

Acceptance Criteria met for the individual CEA Groups? Yes 3.4 Rodded Critical Boron Concentration The Critical Boron Concentration (CBC) measured with CEA Group A fully l

inserted and CEA Group 7 at 175 steps withdrawn was 1234 ppm.

CBC Measured at BOL-HZP-Group A Inserted 1234 ppm

=

I CBC Predicted at BOL-HZP-Group A Inserted 1169 nom

=

Difference 65 ppm

=

Acceptance Criteria is 94 ppm of the predicted Critical Boron Concentration.

Acceptance Criteria met? Yes

Pace 5 i

~

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3.5 Control Rod Drop Time Measurements Control rod drop time measurements were performed on all 61 CEA drive i

mechanisms.

The drop times from 0 to 100c insertion ranged from 2.33 to 2.58 f

c seconds.

j The Acceptance Criteria, per Millstone 2 Technical Specifications, is that all CEA's must drop from 0 to 90Fc insertion in less than 2.75 seconds.

l Acceptance Criteria met? Yes r

4.

POWER ASCENSION TESTING RESULTS 4.1 Power Peaking, Linear Heat Rate and Incore Tilt Measurements l

The measurements of these parameters were:

[

Power Level F,3 Maximum Linear Heat Rate Incore Tilt 65Fc 1.579 8.6 KW/ft 0.011 96Tc 1.556 12.1 KW/ft 0.011 100rc 1.548 12.4 KW/ft 0.010 The corresponding Technical Specification limits for all power levels are:

F,7 s 1.690 Maximum Linear Heat Rate s 15.1 KW/ft i

Azimuthal Power Tilt s 0.02 Technical Specification limits met? Yes 4.2 Critical Boron 3Ieasurements l

At 100Tc power, 339 MWD /MTU, CEA Group 7 at All Rods Out (ARO) and Equilibrium Xenon, the measured boron concentration was 885 ppm.

Adjusted, Measured boron concentration at 1009c power, 339 MWD /MTU, ARO. Eq. Xenon S66 ppm

=

Predicated, Measured boron concentration at 100Tc power, 339 MWD /MTU,ARO, Eq. Xenon =

852 nom Difference 14 ppm

=

Acceptance Criteria is 50 ppm of the predicted Critical Boron Concentration.

Acceptance Criteria met? Yes

Page 6 4.3 Ilux Symmetry Measurements The flux symmetry was measured at approximately 28Fc power using the fixed incore detector monitoring system. The measured deviation between the highest and lowest values in operable symmetric detector locations j

ranged from 0Fc to 9.09Fc.

j Acceptance Criteria is 10% (Deviation between the highest and lowest I

values in symmetric locations).

Acceptance Criteria met? Yes l

l 4.4 Shape Annealing Factor Test t

i Data obtained during the measurement of an induced axial xenon j

oscillation was used to verify that the excore detector shape annealing factors (SAFs) remained valid. The shape annealing factors were last measured during the Cycle 6 startup testing program.

l The axial xenon oscillation measurements were performed at 65c power.

j c

l This test utilizes both the ex-core detectors and the in-core detectors and the in-core analysis computer program, INPAX, to provide meaningful test results. Figure 6.3 shows the induced xenon oscillation.

l Results of the test showed that the shape annealing factors decreased by l

approximately 10G when compared to the values measured in Cycle 6.

l l

The new shape annealing factors will be input into the Reactor Protection System. The table below shows the results for the four safety channels:

Cycle 6 SAF l

Cycle 12 SAF

]

Channel "A" 2.267 2.042 i

Channel "B" 1.783 1.612 Channel "C" 2.116 1.991 Channel "D" 1.870 1.777 The results of this test were acceptable.

l

l Pace 7 1

l 4.5 Moderator Temperature Coefficient The measured MTC value at 96G power, with CEA Group 7 at 150 steps, at an average RCS temperature of 567.87*F and an RCS boron concentration of 884 ppm was -0.681 x 10-4 Ap/*F.

Adjusting this measured value to the prediction conditions of 96Fc power, 572.6*F and an RCS boron concentration of 868 ppm yields an MTC value of -0.770 x 10** Ap!*F.

l Comparing the Adjusted, Measured MTC value to the predicted value yields:

Adjusted, Measured MTC at 96Fc power,

-0.770 x 10-4 Ap/*F 86S ppm boron, and T,ve = 572.6*F

=

l Predicted MTC at 96G power, i

868 ppm boron, and Tate = 572.6*F

= -0.661 x 10-4 An'*F

-0.109 x 10-d Ap!*F Difference

=

Acceptance Criteria is 0.3 x 10-d Ap/*F of the predicted MTC.

Acceptance Criteria met? Yes l

4.6 Doppler Only Power Coefficient I

l The measured Doppler Only Power Coefficient (DOPC) at 94.85Fc power, l

an average RCS temperature of 570.3*F, and an RCS boron concentration of SS4 ppm was -1.304 x 10-' Ap/Fc Power.

Comparing the measured DOPC value to the predicted value yields:

Measured DOPC at 94.85Fc power,

-1.304 x 10-4 Ap/Fc Power l

884 ppm boron, and Tase = 570.3*F

=

Predicted DOPC at 96% power,

-1.030 x 10-4 868 ppm boron, and Tote = 572.6*F Ao/c Power l

=

c

-0.274 x 10-4 Ap/G Power Difference

=

1 Acceptance Criteria is 0.3 x 10-4 Ap/Fc Power of the predicted DOPC.

Acceptance Criteria met? Yes l

4.7 Reactor Coolant System Flow l

The measured Reactor Coolant System Flow Rate at 100Fc power was l

383,802 GPM.

When 13,000 GPM is subtracted from the measured flow rate to account l

for measurement uncertainties, the Minimum Guaranteed Safety Analysis RCS Flow Rate is 370,802 GPM.

l The. measurement uncertainty value of 13,000 GPM is 4Fc of the Design Flow Rate value of 324,800 GPM.

l

l i

I Page 8 i

The Acceptance Criteria per Millstone 2 Technical Specifications, is that the RCS flow must be greater than 360,000 GPM.

[

Acceptance Criteria met? Yes

+

l 4.8 Power Distributions i

l The Radial Power Distribution map for 65G power, 71 M\\\\D'MTU, All Rods Out, Equilibrium Xenon conditions is shown in Figure 6.4. The agreement between the measurements and the predictions is acceptable.

The Radial Power Distribution map for 1007c power, 337 MWD /MTU, All Rods Out, Equilibrium Xenon conditions is shown in Figure 6.5. The agreement between the measurements and the predictions is acceptable.

The Acceptance Criteria is that the difference between the measured and' predicted Relative Power Density (RPDs) for core locations with an operable incore detector is less than 0.10.

Acceptance Criteria met for 65% power? Yes l

Acceptance Criteria met for 1009c power? Yes The Acceptance Criteria is that the Root Mean Square (RMS) of all the differences between the measured and calculated RPDs is less than 5%.

Acceptance Criteria met for 65Fo power? Yes Acceptance Criteria met for 100% power? Yes 4.9 Reactor Coolant System Radiochemistry Reactor Coolant System radiochemistry analyses during the power ascension testing program and subsequent power operation indicate low activity levels in the RCS with Iodine-131 values of about 1 x 10-3 Ci/ml.

P 5.

REFERENCES 5.1 In-Service Test T92-75, Low Power Physics Tests - Cycle 12.

5.2 In-Service Test T92-76, Power Ascension Tests - Cycle 12.

5.3 Millstone Unit 2, Cycle 12, Startup and Operations Report, EMF-92-100(F), October 1992.

l i

5.4 D. P. Austin (SNP) letter to J. A. Camp (NUSCo), " Millstone Unit 2 l

Startup Physics Tests", dated January 11, 1993.

6.

FIGURES 6.1 Cycle 12 Core Loading Map 6.2 CEA Group Configuration 6.3 Xenon Oscillation at 65Fo Power

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4 Page 9 t

6.4 65% Power Distribution Map 6.5 '

100% Power Distribution Map.

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1. 0 t-0.9 v 09 1.0cs 0.964 A,c

_e r 3]

0 964, 0.964 1 00f v 10 ie n(it r-r-<

e nm g 33; Ae W9 vs le 6b H9 F Jk Le J9 Gi)

F9 Ek DS Le BW D.321 1.21f 1 ;;(

'"'J

+6 1.21,3 1.;78 Ao

r. nn n v.r.

x?

W/

v/

!7 57 H7 N7 L7 si G7 F?

Li D7 07 bi 0 ffE 1.2f4 0.9ff 0.f6" j

l 0.5 7f

,1.260 C.9(3 0 57' i

l r e reo r res n.-

l A6 W6 vt 16 66 46 No L6 J6 Gb E6 Eb Do Cd ts6 i

1.144 1.23f 1.C21 1.34*

1.216 1 006 1.17 C 1.170, r

r' re nese

_ n ry Ab W$

v6 lb 65 46 f 46 L3 JS G6 Eb bb Db C6 65 1

1.121 0.33F i

1.135 0.34!-

)

.n n i a r r Ad v4 I4

$4

+44 t#.

L4

,,4 G4 F4 La D4 C4 c 3tf 0.9f3 0 os?

03,5,6

0. 9 f ">

0. 9 ti d n

n. n, -

e n-,

v3 13 s.3 R3 re L3 J3 a

F3 E3 Da l lf' 3.161 0 3*4 1.1*0 3.170 c,yge

-0 ri r

.n nrm n e,5 is di 42 tw L2 JJ G4 F2 L2 0 34f 0.34

.o r,5 Fi M1 W1

• -11 l

Kev i

A10+- Core Location o.303

+-- Measured RPD Root Mean Square of differences o.313

-- calculalea arD for all core locations = 3.12%

-0.010

\\

Diffcrence INOP = Inoperable Incore Detector Location i

I l

l 100Tc Power Distribution Map All Rods Out, Equilibrium Xenon, 337 MWD /MTW l

FIGURE 6.5 l

l t

{

t