ML19290C105
| ML19290C105 | |
| Person / Time | |
|---|---|
| Site: | Browns Ferry  |
| Issue date: | 12/17/1979 |
| From: | Ippolito T Office of Nuclear Reactor Regulation |
| To: | Parris H TENNESSEE VALLEY AUTHORITY |
| References | |
| NUDOCS 8001090468 | |
| Download: ML19290C105 (3) | |
Text
TtR a
^**
8[pn ascq g
UNITED STATES NUCLEAR REGULATORY COMMISSION o
y WASHINGTON, D. C. 20555 8
December 17, 1979 Docket No. 50-259 Mr. Hugh G. Parris Manager of Power Tennessee Valley Authority 500A Chestnut Street, Tower II Chattanooga, Tennessee 37401
Dear Mr. Parris:
In response to your request of September 28, 1978, on September 29, 1978, we issued Amendment No. 43 for the Browns Ferry Nuclear Plant, Unit No.1 to pemit operation with one recirculation locp isolated at a maximum allowable power level of 82%. We had been advised that both the General Electric Company and TVA would be monitoring plant performance during single loop operation. Following startup, we were advised that there was a variation from predicted performance at power levels above 59%
and that TVA management decided to limit power levels to less than 59%
of licensed power during the period of single loop operation.
On November 27, 1978 we requested the infomation identified in the enclosure to this letter from your staff. We were advised that the analysis of the data had not been completed but that a report would be submitted to us when the evaluation was finished. The data has not as yet been received.
On October 27, 1979 you submitted reportable occurrence report BFR0-50-259/
7926 in which you reported that on September 26, 1979, while operating at 98% power, both recirculation pumps tripped and the facility was operated 28 minutes without the pumps in operation.
Most two-loop BWRs have requested approval for single loop operation. The data developed during single loop operation of Unit 1 could be very help-ful in our evaluation of these requests. The data from the September 26, 1979 occurrence on plant perfomance following trip of the recirculation pumps could help to resolve questions as to the consequences of a locked rotor or closure of a recirculation loop valve in the operating loop when operating with a single loop. Accordingly, within 30 days of receipt 1728 185 8 0 010 90.+ 6 f
t Mr. Hugh G. Parris of this letter, we are requesting the data and your evaluation thereof on the performance of Browns Ferry Unit No.1 during the period of single loop operation in the fall of 1978 and following trip of the recirculation pumps on September 26, 1979.
Sincerely.
^
, Chief Operating Reactors Branch #3 Division of Operating Reactors
Enclosure:
Request for Additional Infonnation cc w/ enclosure:
H. S. Sanger, Jr., Esquire General Counsel Tennessee Valley Authority 400 Comerce Avenue E 118 33C Knoxville, Tennessee 37902 Mr. Ron Rogers Tennessee Valley Authority 400 Chestnut Street, Tower II Chattanooga, Tennessee 37401 Mr. E. G. Beasley Tennessee Valley Authority 400 Comerce Avenue W 10C 131C Knoxville, Tennessee 37902 1728 186 Robert F. Sullivan U. S. Nuclear Regulatory Comission P. O. Box 1863 Decatur, Alabama 35602 Athens Public Library South and Forrest Athens, Alabama 35611
\\
BROWNS FERRY UNIT NO. 1 DOCKET NO. 50-259
=.. =..
~
OPERATION WITH ONE RECIRCULATION LOOP REQUEST FOR ADDITIONAL INFORHATION Operation of Browns Ferry Unit No.1 with one recirculation loop isolated was approved by Amendment No. 43 dated September 29, 1978.
Feedback information on your operating experience with one recirculation loop
~~~
would be very helpful in similar potential licensing actions for the
~
Browns Ferry Nuclear Plant and oth.er BWRs. The type of information we would appreciate includes:
1.
Were there any indications of or observed problems with one loop operation?
J_
2.
What power level (s) were you able to achieve?
3.
At the power level (s) you were operating at with one loop, did you have the exact same power distribution, control rod positions, xenon oscillations (or lack of them), etc. that you experienced (or would expect) at the same power level (s) with equivalent flow from two loops?
4.
Have you any suggestions for us or other BWR li' ensees with respect c
to operation with one loop isolated?
. :~~
1728 187
?
ia.ee