ML20073G920
| ML20073G920 | |
| Person / Time | |
|---|---|
| Site: | Browns Ferry  |
| Issue date: | 04/14/1983 |
| From: | Mills L TENNESSEE VALLEY AUTHORITY |
| To: | Harold Denton Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 8304180426 | |
| Download: ML20073G920 (5) | |
Text
,
O TENNESSEE VALLEY AUTHORITY CHATTANOOGA. TENNESSEE 37401 400 Chestnut Street Tower II April 14, 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 At the request of your staff, we met with Oak Ridge National Laboratory (ORNL) on February 11, 1983 to discuss concerns regarding operation with a single recirculation loop at Browns Ferry Nuclear Plant. During that meeting we answered questiens and provided ORNL with considerable data on past Browns Ferry experience in single loop. Enclosed is. additional information and clarification regarding our previous submittals on single loop.
We are still very much interested in obtaining NRC approval of single loop operation at the highest power level attainable. However, we understanding that single loop operation at power levels up to 50 percent may be the only possible option available to us at this time. We want to avoid the need for emergency approval and are willing to work closely with NRC and contractors to resolve any remaining questions and concerns on this issue as expeditiously as possible.
Very truly yours, TENNESSEE VALLEY AUTHORITY L. M. Mills, Manager Nuclear Licensing Subscrib sworn to b Fore 1LLI 1983 me this da of J (90Mh%s-
. WNW Notary Public
(
My Commission Expires /'
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Enclosure cc: See page 2 8304180426 830414 PDR ADOCK 05000259 P
PDR An Equal Opportunity Employer
. Mr. Harold R. Denton April 14,1983 cc (Enclosure):
U.S. Nuclear Regulatory Commission Region II ATTN: James P. O'Reilly, Regional Administrator 101 Marietta Street, Suite 2900 Atlanta, Georgia 30303 t
Mr. R. J. Clark Browns Ferry Project Manager U.S. Nuclear Regulatory Commission 7920 Norfolk Avenue Bethesda, Maryland 20814 1
l I
1
ENCLOSURE ADDITIONAL INFORMATION AND CLARIFICATION REGARDING SINGLE RECIRCULATION LOOP OPERATION BROWNS FERRY NUCLEAR PLANT
(
Reference:
TVA letter from L. M. Mills to H. R. Denton dated January 6, 1983) 1.
NRC requested that figure 3 of the referenced letter be clarified.
Test data was recorded at various conditions as listed in the attached tables A-1 and A-2.
The maximum peak to peak variation APRM signal was then determined from each recording and that point was plotted against the active loop flow for that condition. The figure also includes an operating map showing the region in which the tests were performed. It should be noted that active loop flow and total core flow are not directly proportional due to inactive loop backflow characteristics.
2.
During the February 11, 1983 meeting between TVA and ORNL, it was pointed out to us that our response to question 1 of the referenced letter was incorrect.
Paragraph 2 of that response states that "the individual jet pump flow variations show no relationships to the power-void characteristics signal (i.e., flux) and their signals show no common jet pump oscillation driving them from the discharge end.
noise observed... is not driven by power-void feedback." TVA agrees that this is not correct and, in fact, there will always be a component of jet pump variation though it may be small which is characteristic of power-void feedback and which is common to all jet We contend that because the individual jet pump flow signals pumps.
bear no resemblance to the flux and total flow signals, the power-void effect on the jet pump signals is a minor component compared to the others which add together to comprise the total signal, and that the major components are not common to all jet pumps and not related to power-void feedback.
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