ML19241B171
| ML19241B171 | |
| Person / Time | |
|---|---|
| Issue date: | 05/07/1979 |
| From: | Anderson N Office of Nuclear Reactor Regulation |
| To: | Check P Office of Nuclear Reactor Regulation |
| References | |
| FOIA-79-98, TASK-TF, TASK-TMR NUDOCS 7907120739 | |
| Download: ML19241B171 (1) | |
Text
/
S UNITED STATES I
, ?*
NUCLEAR REGULATORY COMMISSION f.e
,C.
WASHINGTON, D. C. 20555 YN M, /j!
g, May 7, 1979 MEMORANDUM FOR:
Paul S. Check, Chief Reactor Safety Branch FROM:
Newton Anderson, Senior Reactor Safety Engineer Systematic Evaluation Program Branch
SUBJECT:
FREQUENCY OF OCCURRENCE OF FEEDWATER TRANSIENTS FOR BABCOCK & WILC0X, WESTINGHOUSE AND COMBUSTION ENGINEERING I have been concerned that staff comparisons of feedwater transients have beer based on LER's and may be misleading.
My concern is based on (1) feedwater transients would only be reported in LER's if they resulted in a technical specification violation, and (2) it seems to me that B&W feadwater transients would result in a technical specification violation more of ten than Westinghouse or Combustion Engineering due to design differences.
I have reviewed gray book data on plant shutdowns for the one-year period from March '78 to March '79 and identified forced shutdowns which were initiated by, or involved malfunctions of the feedwater system.
I did not include normal shutdowns to make repairs to feedwater systems.
I believe the frequencies compiled in this manner are reasonably correct.
The results were:
(1) 9 BsW plants had 27 feedwater transients or 3.00 per year, per plant; (2) 24 Westinghouse plants had 44 feedwater transients or 1.83 per year, per plant; and, (3) 7 Combustion Engineering plants had 13 feedwater transients or 1.85 per year, per plant.
The frequency of feedwater transients is not appreciably higher (about 60%) for B&W. The difference may be at least partially due to the new-ness of the B&W plants as compared to Westinghouse and Combustion Engineering.
6 c50328
'/u d, Anderson, Senior Reactor W%
Newton Safety Engineer, SEPS cc:
D. Davis f'o t s m N D. Allison R. Tedesco 71-13 79071207'%
D. Eisenhut J. Watt
@