ML20004E504

Cycle 2 Startup Test Rept.

ML20004E504
Person / Time
Site:	Beaver Valley
Issue date:	02/28/1981
From:	DUQUESNE LIGHT CO.
To:
Shared Package
ML20004E503	List: ML20004E502 ML20004E504
References
NUDOCS 8106120271
Download: ML20004E504 (11)

Text

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O CYCLE 2 STARTUP TEST REPORT FEBRUARY, 1981 BEAVER VALLEY POWER STATION DUQUESNE LIGHT COMPANY k

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Beaver Valley Power Station Cycle 2 Startup Test Report Introduction This report describes the startup testing program applicable for the Cycle 2 reload core design verification and experimental evaluation of the shutdown capability of the Rod Cluster Control (RCC) banks prior to power escalation of the Beaver Valley Power Station, Unit 1.. This testing program consisted of the following measurements:

1. Control rod drop time measurements.

2. Critical boron concentration measurements.

3. Control rod bank worth measurements,

a. " Boron Dilution" method

b. " Rod Swap" method

4. Temperature coefficient measurements.

S. Power coefficient measurement.

6. Startup power distribution measurements using the incore flux mapping system.

The RCC bank worths' were initially measured using the " Boron Dilution" technique. In addition, the " Rod Swap" technique for measuring the reactivity worth of the RCC banks was also employed as a comparison to the boron dilution ubM.

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! The results of the various startup and low power physics tests are summarized in thic report and comparisons are made to predicted design values and applicable BVPS technical specification requirements.

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Beaver Valley Power Station Cycle 2 Startup Test Report Test Summary Prior to the performance of the initial criticality and low power physics tests, the drop times of each full length Rod Cluster Control Assembly (RCCA) was measured both at cold no RCS flow and hot full RCS flow plant conditions. The drop times of all 48 rods were well within the BVPS Technical Specification requirement of < 2.2 seconds from the beginning of rod drop to dashpot entry.

The initial criticality of cycle 2 reload core was achieved at 0534 hours0.00618 days <br />0.148 hours <br />8.829365e-4 weeks <br />2.03187e-4 months <br /> on November 11, 1980. Following initial critic lity, the operational checkout of the Westinghouse reactivity computer was successfully completed and the Zero Power Physic's Testing (ZPPT) initiated.

Isoehermal Temperature Coefficient (ITC)

Two separate measurements of the isothermal temperature coefficient were made during zero power physics testing; the first with an All Rods Out (ARO) configuration and the second with ARO except Control Bank D (CSD) at 0 steps. As can be seen on Table No. 1, the values obtained for the ITC's were within BV?S test acceptance criteria. Using the ARO !sothermal l temperature coefficient and the predicted design value of the doppler coefficient, the Moderator Temperature Coefficient (MIC) calculates out to be l

j - 0.93 pcm/0F which meets the requirements of BVPS Technical Specification, which states that the MTC be less positive than 0 pcm/ F.

! Zero Power Full Core Flux Maps I

Full Core Flux Maps (FCEM) were also obtained during each of the bank l configurations of ARO and ARO excent CBD at 0 steps, to determine the initial flux distribution in the core during the ZPPT. Values for Quadrant 111ts, 3

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Beaver Valley Power Station Cycle 2 Startup Test Report Test Summary (continued)

Nuclear Entha3py Rise Hot Channel Factor (FN gg), and maximum deviations from predicted for Relative Assembly Powers are listed on Table No. 2 along with a comparison to the acceptance criteria. The quadrant tilt value for the all rods out zero power flux map was 1.02 which is the limit per the BVPS Technical Specifications for power operation above 50% full power. Since all other flux maps taken measured quadrant tilts well below this limit, the quadrant tilt values were determined to be acceptable.

Boron Endpoint Concentrations Table No. 3 lists the boron endpoint measurements for each of the Control Banks along with their predicted values. The measured ARO boron endpoint was within its predicted value of 1355 1 50 ppa.

Bank Worths (Boron Dilution method)

Bank worths were obtained down to the N-1 configuration using the Boron Dilution method. Table No. 4 compares the measured integral bank worths with l

their predicted values. The total control bank worth and the N-1 total red worth were both well within i 10% of their predicted values.

Bank Worths (Rod Swap method)

As mentioned previously, in addition to the boron dilution method for obtaining the bank worth measurements, the " Rod Swap" method was also performed as an alternate method for bank worth verification. For cycle 2, Control Bank B (CBB) was predicted to have the highest bank worth of all

l. banks, shutdown or control, and therefore served as the reference bank for the l

Beaver Valley Power Station Cycle 2 Startup Test Report Test Summary (continued) rod swap portion of the test. The integral worth of CBB was first measured in an unrodded core by the boron dilution method. While maintaining a constant RCS boron concentration, each bank was fully inserted into the core while compensating for the reactivity insertion by withdrawing the reference bank, CBB. The integral worth of each bank was then calculated relative to the reference bank. These calculated values of the inferred integral bank worths are presented on Table No. 5 along with the design predictions.

Table No. 6 presents a summary of the integral bank worths obtained from the two techniques (Boron Dilution vs. Rod Swap) and the comparison of these results with design predictions.

With the zero power physics testing completed, a series of Full Core Flux Maps were taken at approximate 1/ 50%, 75% and 100% full power for the purpose of incore-Excore Axial Offset Detector Calibration. All values obtained from these flux maps met all the requirements of BVPS Technical Specifications.

Power Coefficient Measuremene,t The power coefficient was measured during a 10% reactor load change between 90 ,100% full power. The power coefficient was determined to be

-11.46 pcm/: power, corrected for xenon changes, which was w~ thin the a11cw 11e tolerance of -9.15 to -17.03 pcm/% power as per design predictions.

,r u---w_ = -rw +-e-- -p g--- 7 --mc---g,y---w-www >f - , .-yy---r-+ -- -r- y w--= f-wi- --* v- '+

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Beaver Valley Power Station Cycle 2 Startup Test Report TABLE NO. 1 Isothermal Temperature Coefficients RCCA BANK I.T.C. MEASURED I.T.C. PREDICTED CONFIGURATION (PC4/0F) (PCM/0F)

A.R.O. -2.93 -3.0 1 3.0 C.B.D. IN -5.58 -5,9 i 3.0

.. - .-. . . . - - . . .. . . - . - - . . , . . - .. . . . . , - = - - , . - - - . _ , . - - - _ , _ , . - , - _ _ - . - - - . . _ .

Beaver Valley Power Station Cycle 2 Startup Test Report TABLE NO. 2 Full Core Flux Map Results for Zero Power Physics Tescing

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Measured Acceptance All Rods Out Value Criteria Quadrant Tilt 1.02 < 1.02 1.504 1.46 1 0.15 FfH(maximum)

. Maximum Deviations from -8.4% + 10%

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Predicted for Relative Assembly Powere, (%)

Measured Acceptance All Rods Out except CBD In Value Criteria Quadrant Tilt 1.012 <_ l.02 P H (maximum) 1.805 1.78 i,O.18 Maximum Deviations from +6.0% i 15%

Predicted for Relative Assembly Powers, (%)

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Beaver Valley Power Station Cycle 2 Startup Test Report TABLE NO. 3 Boron Endpoint Concentrations Measured Predicted Bank Llue Value Configurneions (PPM) (PPM)

ARO 1391.8 1355 + 50 D In 1278.4 1245 D + C In 1164.6 1132 D + C + B In 1016.9, N/A D + C + B + A In 835.1 N/A

Beaver Valley Power Station Cycle 2 Startup Test Report TABLE NO. 4 Integral Bank Worth Measurements from the

" Boron Dilution" Method l ..

RCC RCC Bank Integral Reactivity Worth Bank Measured Predicted Error Value (M) Value (P) (M-P (Pem) (pca) P . (%)

CBD 1003.4 1030 i 155 -2.6 CBC 1049.7 1062 1 159 -1.1 CBB 1316.4 1394 1 209 -5.6 CBA 1765.3 1727 1 259 +2.2 Total Worth of Control 5134.8 5213 1 521 -1.5 Banks (N - 13 Worth 6242.4 6763 -7.7 i

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Beaver Valley Power Station Cycle 2 Startup Test Report TABLE NO. 5 Comparison of Measured / Inferred Bank Worths with Desian Predictions from " Rod Swap" Method kCCA Inferred Predicted Error Bank Bank Worth (I' Sank Worth (P)

(pcm) (pcm) {I-P) P

(%)

CBB 1093.1* 1107 -1.3 SBA 910.5 956 -4.8 SBB 806.1 808 -0.2 CBA 787.8 803 -1.9 .

.CBC 855.4 856 -0.1 CBD 1030.8 1030 -0.1 i

Total Worth of banks 5483.7 5560 -1.4

• Measure by Boron Dilution l

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Beaver Valley Power Station Cycle 2 Startup Test Report i

TABLE NO. 6 Comparison Between Rod Swap and Boron Dilution Bank Worth Results RCC Bank Integral Reactivity Worths Rod Exchange Results RCS Boron Dilution Results RCC (Individual Bank Worths) (Banks in Normal Insertion Sequence)

B:nk Inferred ' Predicted Measured Predicted (I-P) Value(P) (M-P}

1 Value(I) Value(P) P Value(M) P (pcm) (pcm) (%) (pen) (pcm) (%)

CBD 1030.8 1030 -0.1 1003 1030 -2.6 CBC 855.4 856 -0.1 1050 1062 -1.1 CBB 1993.1* 1107 -1.3 1316 1394 -5.6 CBA 787.8 803 -1.9 -1765 1727- +2.2 SBB 806.1 808 -0.2 --

SBA 910.5 956 -4.8 -- - -

N 5483.7 5560 -1.4 -

N-1 - - 6242 6763 -7.7 i

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• Measured Directly by Boron Dilstion l

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