ML19317D503
| ML19317D503 | |
| Person / Time | |
|---|---|
| Site: | Oconee  |
| Issue date: | 08/27/1976 |
| From: | Parker W DUKE POWER CO. |
| To: | Rusche B Office of Nuclear Reactor Regulation |
| Shared Package | |
| ML19317D504 | List: |
| References | |
| NUDOCS 7912060763 | |
| Download: ML19317D503 (1) | |
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3 s Mr. Benard C. Rusche, Director Office of Nuclear Reactor Regulation
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Washington, D. C.
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& 00C hf ff Attention:
Mr. A. Schwencer, Chief Operating Reactors Branch No. 1 Re: Oconee Nuclear Station Docket Nos. 50-269, -270, -287
Dear Mr. Rusche:
Attached is the Oconee Unit 2, Cycle 2 Zero Power Physics Test Report, which provides a comparison of the predicted core physics parameters with those measured during the Cycle 2 zero power physics test program of Oconee Unit 2.
This report is submitted in conformance with the Commission's request as specified in the safety evaluation report accompanying your letter of June 30, 1976.
Ver truly yours,
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William O. Parker, Jr.
EDB/PMA:vr Attachment 7912060763 S165
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OCONEE NUCLEAR STATION UNIT 2 CYCLE 2 ZERO POWER PHYSICS TEST REPORT The Cycle 2 startup test program for oconee Unit 2 consisted of pre-critical tests, zero power physics tests, and power escalation tests. This report provides a sunniary of the zero power test results and includes comparisons of measured and predicted values of important core parawters, i
The Cycle 2 zero power testing was initiated on July 8, 1976, and consisted of critical boron concentration and boron worth measurement, temperature reactivity coefficient measurement, control group worth measurement, and ejected rod worth measurements. All tests were conducted at hot zero power conditions (532 F, 2155 psig, and 0 %FP).
A summary of the results of these tests follows:
l 1.
Critical Boron Concentration and Boron Worth Measurement Deboration to criticality was started with an initial Reactor Coolant System boron concentration of 1835 ppmb, and criticality was achieved with a boron concentrationof 1420 ppmb.
The boron concentration for the l
all-rods-out condition was determined to be 1426 ppmb. This value differed by only 4 ppab from the predicted value of 1430 ppmb and was l
well within the acceptance criterion requiring agreement within 100 ppmb.
The differential boron worth was measured to be 1.03% ak/k/100 ppmb.
This value was within 2.2 percent of the predicted worth of 1.008%
ak/k/100 ppmb and met the acceptance criterion requiring agreement within 10 percent.
I 2.
Temperature Reactivity Coefficient Measurement Temperature reactivity coefficients were determined for the condition in which all control rods were fully withdrawn and for the condition in which only the safety rods (Groups 1-4) were withdrawn.
Table 1 cowares the results of the measurements with their respective predicted values, and it is seen that the test results were within the acceptance criterion limit.
3.
Control Rod Group Worth Measurement Table 2 summarizes the results of the control rod group worth measurements.
As indicated, measured values of all control rod group worths are within acceptance tolerances.
The most important quantity among control rod group worths is the total group worth, and it is note worthy that the measured and predicted values of the total group worth are in remarkable agreement (within 1.7 percent of each other).
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-2, 4.
Ejected Rod Worth Measurement The value of the worst case ejected rod worth was measured to be 0.51%
Ak/k, as compared to the predicted value of 0.59% Ak/k, and is well below the maximum allowable value of 1.0% Ak/k.
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TABLE 1 COMPARISON OF PREDICTED TEMPERATURE COEFFICIENTS WITH THOSE MEASURED DURING ZERO POWER PHYSICS TESTS Predicted Deviation From Acceptance Measured Value Value Predicted Value Tolerance
~4
-4 4
(104 Ak/k/ F)
(10 Ak/k/ F)
(10 Ak/k/ F)
_(10 Ak/k/ F)
All rods out 0.24 0.05 0.19 10.4 Safety Rods Out
-0.45
-0.68 0.23 10.4 TABLE 2 COMPARISON OF MEASURED AND PREDICTED CONTROL R0D GROUP WORTHS
(%)
Measured Worth Predicted Worth Acceptance CRA Group
% Ak/k
% Ak/k
% Difference Tolerance 7
0.767 0.830 7.6 1 20 6
1.024 1.189 13.9 1 20 5
0.709 0.813 12.8 1 20 1-4 7.15 6.987 2.3 1 20 TOTAL l-7 9.65 9.82 1.7 i 15 1