ML20084G902
| ML20084G902 | |
| Person / Time | |
|---|---|
| Site: | Oyster Creek |
| Issue date: | 01/05/1972 |
| From: | Finfrock I JERSEY CENTRAL POWER & LIGHT CO. |
| To: | Morris P US ATOMIC ENERGY COMMISSION (AEC) |
| Shared Package | |
| ML20084G904 | List: |
| References | |
| NUDOCS 8304270101 | |
| Download: ML20084G902 (2) | |
Text
,
/ +.
O O
n$)I ll ed Jersey Central Power
- Light Company l
M ADI5oN AVENUE AT PUNCH OoWL. Ro AD e MoRRISToWN. N.J. 07960 e 539 61t f January 5, 1972 c5 g M
/
.D -(1 t
n
~
m l
Dr. Peter A. Morris, Director C[ 1, O M
Division of Reactor Licensing pl
- k], t y l
United States Atomic Energy Co=:r.ission l
Washington D.C. 20545 M'
W l
h b
i
Dear Dr. Morris:
0 l
Subject:
Oyster Creek Station Docket No. 50-219 Trip of Diesel Generator No.1 During Surveillance Test During a surveillance test of diesel generator no. 1 on l
December 28, 1971, the unit tripped off the line as the result of l
an empty fuel oil tank. This incident is being reported as an abnormal occurrence in accordance with Technical Specification 6.6.B.2.
l Each diesel generator at Oyster Creek is equipped with j
one, 130-gallon fuel oil day tank, one main fuel oil pump which takes suction from the day tank, and two fuel oil transfer pumps which take suction from the 15,000-gallon main oil tank. The fuel oil level in the day tank is controlled by_ float _svitches located in the day tank and operate so that as fuel is consumed by the engine E d the-fdel level drops, a fuel transfer switch will activate the no 1 fuel transfer pump to maintain the day tank level. If the fuel' level continues to drop, another lov level transfer switch will activate fuel transfer pump no. 2 and n local annunciator at the unit vill indicate a fuel transfer fault.
l The two fuel oil transfer pumps are operated by 230-volt, I
single-phase, capacitor start motors. Upon investigation it was found that both motor-starting switches were not making proper contact so that, at times, the pumps would run and at other times they would not.
In this iristance, neither the no.1 pump ner the
, h' g
backup no. 2_ pump started. As a result, the daf~ta511 ved fempty and the erigine shut d'ovn.
' f)]f-/[t1 As an immediate temporary measure, the backup transfer
- g,,[
pump motor from diesel generator no. 2 was moved to diesel generator no.1 to drive the preferential no.1 pump and the unit was made l(Q, A [/
available.
The no. 1 diesel generator was out of service for approximately five hours. Subsequently, the switches were cleaned O
y and replaced on all four fuel oil transfer pump motors.
6 8304270101 720105 i
PDR ADDCK 05000219
/
COPY ZEf ~ g N N
g, S
_. _ _. _ _ ~.
,3
_3,~,.-
~ _ _ _.
O
/ D I
N/
l l
Dr. Peter A. Morris Page II January 5, 1972 The probability analysis in Appendix L of the FDSAR was based on one diesel and saows that even with only one diesel the probability of requiring engineered safety features at the same time as the second diesel fails, is quite small.
Since the re-quirements for operation of engineered safety features can be supplied by one diesel, there was no nuclear safety significance involved in this event as the second diesel was always available.
In order to prevent a recurrence of this incident, a test of the fuel oil transfer pumps has been added to the monthly main-(
tenance surveillance check shect; and the inspection of the motor-starting switches has been added to the six-month maintenance surveillance check sheet. In addition, the local annunciator that indicates a fuel transfer fault will be connected to sound a remote alarm in the station control room.
Twenty-five copies of t,his report are enclosed.
e l
Very truly yours, o
fi M
I, Ivan R. Finf sek r.
(
Manager, Nu ear Generating Stations IRF/pk Enclosures cc: Mr., J. P. O'Reilly, Director Division of Compliance, Region I 4
l l
I l
l l
5
'e y = e s s wd.
9-
.'hr=Dem-.-
zh.ed
. 'r 4 4
- ->pp**9-e emaaiss p er
,e, e w y = wwwwwwe a-
.s w +w M 1sN eo-teepe=~ 4Emed N
> 4
- P e a,-ey '
. _