ML19340A343
| ML19340A343 | |
| Person / Time | |
|---|---|
| Site: | Crystal River  |
| Issue date: | 12/09/1971 |
| From: | Jennifer Davis US ATOMIC ENERGY COMMISSION (AEC) |
| To: | Rodgers J FLORIDA POWER CORP. |
| References | |
| NUDOCS 8003160051 | |
| Download: ML19340A343 (3) | |
Text
,.
sm.
L l
I i-M.'d'**.d ATOMIC ENE.;GY COMMISSION U.t';TIL S7tTES i.;Qap[j.)
,['N
'f DIV!SICN OF COCUANCC y f, e7 att.. w n -..,r c m
-[..g*
O M A C aC MT H E C a* S E ;-, Per A ? m A CST e
gmt areau
- 4. e. r n a. a uma 1
In. Reply Refer to:
December 9, 1971 C0 :II:50-302 y.
c, Florida Power Corporation Attn: Mr. J. T. Rodgers Nuclear Project Manager 101 Fif th Street South E
~
P.O. Box 14042 St. Petersburg, Florida 33733 Gentlemen:
Wa recently received information from two licensees opeating pressurized water reactors which may relate to the future performance af reactor scram circuit breakers in your facility.
This ' letter provides you with a copy of the body of the letter. that
,r was forwarded to the licensees of operating pressurized water reactora
/
by cognizant Regional offices of the Division of Compliance.
~
No action on your part is required; however, we will review this matter.
during our continuing inspection program.
l Should you have any questions concerning this matter, we will be pleased f
- to discuss them with you.
L Very truly yours, L
i x,
I John G. Da'vis Director I-
Enclosure:
p i
. Body of Letter to Licensees
(-
of Operating Pressurized
-Water Reactors 800sisoogj
(-
k
~
BODY OF LETTER TO LICENSEES OF OPERATING PRESSURIZED WATER REACTORS We recently received informatisn relating to the performance of reactor scram circuit breakers from two licensees operating pressurized water reactors. The reactor scram circuit breakers are Westinghouse, type DB-50.
The information is as follows:
Plant A Three failures to operate cccurred at this facility. Each aTilure involved the undervoltage trip attachment. No common mode of failure could be identified. One failure was attributed to a broken latch pin, the second to mechanical binding of the trip lever, and the cause of the third was not specifically identified.
Plant B Two of the two scv.cor scram circuit breakers failed to trip on undervoltage during surveillance testing. The failure to trip was attributed to dirt accu =ulation on exposed linkages. This failure occurred after completion of inspection of the scram breakers to determine the applicability of the problems observed at Plant A.
It is requested that you inform this of fice within ten days, in writing, whether reactor scram circuit breakers of the described make and model are installed in your facility. If the answer to this question is in the af firmative, provide the date when each
- o. your reactor scram circuit breakers will be inspected and tested.
In addition, it is requested that you inform this office within ten j
days, in writing, following completion of your inspection and test, of your specific findings, including a description of corrective action taken or planned and the scheduled completion date of planned actions.
Should you have any questions concerning this matter, we will be pleased to distuss them with you.
1 s,
Letter to Florida Power Corporation dated December 9,1971 DISTRIBITTION:
~~;-..,
K', \\
J. 3. Henderson, CO (6)
.a A. Giambusso, CO L. Kornblich, Jr., CO
\\l.,
R. H. Engelken, CO ij DR Central Files.
,']l,7 s
0 9
[
...._...,._....,______-s.,
_