ML20085D792
| ML20085D792 | |
| Person / Time | |
|---|---|
| Site: | Browns Ferry  |
| Issue date: | 07/22/1983 |
| From: | Kammer D TENNESSEE VALLEY AUTHORITY |
| To: | Harold Denton Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 8307290109 | |
| Download: ML20085D792 (4) | |
Text
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TENNESSEE VALLEY AUTHORITY CH ATTANOOGA. TENNESSEE 374ol 400 Chestnut Street Tower II July 22, 1983 Mr. Harold R. Denton, Director Office of Nuclear Reactor Regulation U.S. Nuclear Regulatory Commission Washington, D.C. 20555
Dear Mr. Denton:
In the Matter of the
)
Docket Nos. 50-259 Tennessee Valley Authority
)
50-260 50-296 T. A. Ippolito's letter dated September 9, 1981 and R. J. Clark's letter dated March 29, 1982 to H. G. Parris transmited Amendment Nos. 75, 72, and 52 to Facility Licenses DPR-33, -52, and -68.
These amendments changed the technical specifications of Browns Ferry Nuclear Plant to reflect a modified electrical distribution system. The Safety Evaluation Report attached to these amendments committed TVA to test and verify the results of analyses performed demonstrating the adequacy of the electrical distribution system voltages. The test procedure scoping document describing basic test methods to be employed in the verification testing was submitted by L. M. Mills' letter to you dated July 8, 1982.
Enclosed is the report documenting the results of the testing. As stated in the report conclusions, the measured data was not more than three percent below the analytically predicted results. Submittal of this report completes actions required of TVA regarding adequacy of electrical distribution system voltages.
Very truly yours, TENNESSEE VALLEY AUTHORITY DS %
D. S. Kammer Nuclear Engineer Subscrib an sworn to befo e me this da f
1983 Notary Public g
My Commission Expires
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0I Enclosure cc: See page 2 (9
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8307290109 830722 PDR ADOCK 05000259 P
PDR 1983-TVA 5OTH ANNIVERSARY An Equal Opportunity Employer
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Mr. Harold R. Dento.i July 22, 1983 cc (Enclosure):
U.S. Nuclear Regu1%ory Commission Region II ATTA: James P. O' killy, Regional Administrator 101 Marietta Streen NW, Suite 2900 Atlanta, Georgia 50303 s
Mr. R. J. Clark Browns Ferry Project Msnager U.S. Nuclear Regulatory Conunission 7920 Norfolk Avenue Bethesda, Maryland 20814 f
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1
BROWNS FERRY NUCLEAR PLANT AUXILIARY POWER TEST AND VERIFICATION STUDY Purcose To complete TVA's commitment to NRC to test and verify the results of the analysis performed demonstrating the adequacy of the electrical distribution system voltages.
Apcroach Current, kW, kVAR, and voltage ceasurements were taken at the plant before, during, and after startup of CCW pump 2A, RHR pump 2B, and CB chiller B.
For each motor the following steps were performed.
1.
A computer program (VNEW) was set up to reflect the power supply circuit to the motor based upon design data.
2.
The plant measured prestart currents (with their associated phase angles) which were simulated in the program by adjusting board loading.
3 The motor supply board voltage determined by the program (at plant-measured prestart current) was then compared with plant-measured (prestart) voltage; a percent difference was determined.
4.
The program then simulated the motor startidg using design-based motor data. The program-derived voltages (during and after motor starting) were then compared with plant-measured voltage readings, and a percent difference was determined.
Acceotance Criteria Measured data from post-modification test PMT-104 could not be more than 3 percent below analytical data.
Results Program. CCWPPS: CCW Pumo Pre-Start A constanc impedance running load of 31311 + J2.2506 was used to achieve a current of 510A, which was measured at the secondary of the common station-service transformer A and start bus 1A.
The calculated voltage using the measured current was 4,368 V, which was 0.414 percent higher than the measured voltage of 4 350 kV on the 4-kV unit board 2A.
Procram. CCWPS! CCW Pumo During and After Start The calculated starting voltage was 4.08 kV, which was 2.05 percent higher than the measured voltage of 3 998 kV on the 4-kV unit board 2A.
The calculated voltage after start was 4,345 V, which was 1.0935 percent higher than the measured voltage of 4,298 V on the 4-kV unit board 2A.
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e Prorram. RHRPS: RSR Pumos Pre-Stqtt A running load to give a current value of 780A which was measured at the start bus 1 A and a running load to give a current value of 133A which was measured at shutdown-board C were used as inputs to computer program
"\\NEW." The calculsted voltage using the measured current was 4.335 kV, which was 1.5 percenc lower than the measured voltage of 4,400 V on the 4-kV shutdcwn board C.
Prorram.'RHRAS: RHR Pumos Durinz and After Start The calculated starting voltage was 4.048 kV, which was 0.44 percent lower than the measured voltage of 4.066 kV on the 4-kV shutdown board C.
The calculated voltage af ter start using the measured current was 4.314 kV, which was 1.33 percent lower than the measured voltage of 4 372 kV on the 4-kV shutdown board C.
Program. CBCPS: CB Chiller Pre-Start A constant impedance running load of 0.427 + j0 356 was used to achieve a current of 650A, which was measured at the secondary of the 750-kVA, 4.16/0.48-kV transformer TSIB and 480-V shutdown board 1B.
The calculated voltage using the measured current was 494 V, which was 314 percent lower than the measured voltage of 510 V on the 480-V shutdown board 1B.
Program. CBCS CB Chiller During and After Start The calculated starting voltage was 457 Y which'was 0.652 percent lower than the measured voltage of 460 V on the 480-V shutdown board 1B.
The calculated voltage after start was 490 V which was 2 778 percent lower than the measured voltage of 504 V on the 480-V shutdown board 1B.
Conclusion
,a The measured data was not more than 3 percent below the analytical data.
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