ML20084D859
| ML20084D859 | |
| Person / Time | |
|---|---|
| Site: | Dresden  |
| Issue date: | 07/17/1970 |
| From: | Hoyt H COMMONWEALTH EDISON CO. |
| To: | Morris P US ATOMIC ENERGY COMMISSION (AEC) |
| References | |
| 02533, 2533, NUDOCS 8304120497 | |
| Download: ML20084D859 (2) | |
Text
.
30a37 g
f
/
s/'
\\
4 I
\\
\\j
)
f7 4
= '
<t g
G-LOlri 1U O r1WCa nt; L.I,. :i O 4 t CO D1 }mily N
s ~ _ _ _ _..
ONE F1RST NATIONAL PLAZA CHICAGO.
8 L LI N OI S Address Reply to-POST OFFICE BOX 767
- C H I C A G O, ILLINOIS 60690 Dresden Nuclear Power Station R. R.
- 1 Morris, Illinois 60450 Dr. Peter A. Morris, Director Division of Reactor Licensing U. S.
Atomic Energy Commisaion Wa sh ing t on D. C.
20545
Dear Dr. Morris:
Th is is to report a condition relating to the operation of the station in which the Low Pressure Coolant Injection (LPCI) System was found to have been inoperable during a time in which it was required to be operable.
The e#
plant was shutdown for a maintenance and fuel inspection outage at this time. #}
t Problem and Initial Action This situation was discovered at 4:00 p.m. on July 8, 1970 during checkout of the LPCI System for a special test.
The control switches for the LPCI pumps were found in the pull-to-lock position; this would have prevented the pumps from starting on an init iation signal.
The control switches were im-mediately returned ro the norma 1 position and the Operating Engineer notiffed.
All other required emergency core cooling system were operable at the time.
The LPCI System was required to be operable at th is time as specified in section 3.5.A.4 of the Technical Specifications.
Inve a t iga t io_n Investigation of the cenditions leading to this situation was immed-iately begun and revealed the following-The system was last known to be in the proper condition on June 27, 1970 when raonthly surveillance vaa conducted on the Li CI puttps.
On the 4 p.m.-12 p.m.
shif t of July 6, 1970, the 2C LPCI pump was run to circulate the Lorus for a water sample. At this time the LPCI control switches
,m re found in pull-to-lock; and the control switch for 2C was returned to pull-to-lock followin>; its run.
Tbe operator states that this was the "as-found" condit ion and did not question it.
' 7/.E2.h()
g.g Betweea June 2 7 and July 8, the reactor mode switch was in REFUEL and core alterations were made during most of the shifts. These alterations consisted
.WB
~
/
g y ;
/. @.c / %LSD r g
I sg u D
/J
'h COPY GENT REGION iw't.e,
.v n'.
s ,'
{,
\\
s l',t, 5 llt.,\\
l t
02533
/
t 8304120497 710717 gDRADDCK05000 g{
x_
~
r, Dr. Peter A. Morris July 17, 1970 of irradiated fuel removal and replacement, loading of new fuel, LPRM string removal and replacement, and control rod blade withdrawal and insertion for control rod drive replacement.
Review of the operatin;; order, procedures, and logs and survey of the shift personnel reveals no order to place the control switches in pull-to-lock and no information as to when they were placed in that condition.
Corrective _ Action The following has been or will be done to preclude the possibility of this situation, or similar situations, occuring again:
-~~
1.
The operating shifts have been instructed to review the sections of the Technical S ccifications relating to the emergency core i
cooling systens.
2.
An operating order will be writtea requiring the operating shift to review the operability of systems with technical specification requirements as soon as practicable upon assuming the shif t.
3.
The checkof f lis t s and procedures for Tech Spec related system; will be reviewed and revised as necessary to include the proper position of the control switches for system operability.
///
/
. [,. bd.
H. K.
11ov t /
~
Superintendent IIKil: glw 1
1 1
]