ML19317F359
| ML19317F359 | |
| Person / Time | |
|---|---|
| Site: | Oconee  |
| Issue date: | 06/06/1977 |
| From: | DUKE POWER CO. |
| To: | |
| Shared Package | |
| ML19317F350 | List: |
| References | |
| RO-270-77-09, RO-270-77-9, NUDOCS 8001140612 | |
| Download: ML19317F359 (1) | |
Text
g-,
3
=;,
~
- ~, 9 i
'b 3s-'
u;
'yf~~.
~ ~~
l:(l i
%,V
. : DUKE; POWER COMPANY. ~
- OCONEE UNITJ2'
/
_ nr he 7
iReport No.: LR0 270/77 T b;
LReportrDate: 7Junei6, 1977--
i c J:Occurrenc'e'Date:.May 5,(1977 Fac11'Ity: 10conee. Unit:2,: Seneca,; South Carolina 1
+
' Identification of; Occurrence: : Reactor-. Building cooling unit inoperable due to failed magnetic.contactor Conditilons Prior: toJ ccurrence: Unit at 100 percent full power 0
Description of Occurrence:
.OnMayi5,l1977;NuringtheperformanceofaReactorBuildingemergencycool-Lingand~ isolation logic on-line' test. the "2A" Reactor Building cooling unit s
'(RBCU)' failed'to start in low speed.
Investigation revealed that a high
~~ speed.. starter? finger'. contact on the unit was. inoperable. The contact was repaired and:the."2A" RBCU'was returned to service'within 3 hours3.472222e-5 days <br />8.333333e-4 hours <br />4.960317e-6 weeks <br />1.1415e-6 months <br /> of'the
- ine'id en t.
Apparent Chuse of-' Occurrence:-
7 1
This occurrence was caused by a bent contact.on the."B" finger of the "2A"
, :RBCU high' speed starter. This contact must be made for:the motor to start-
~
in~1owispeeda
~
" Analysis'of Occurrence:
U or : the 'perio'd ~of time;'during-which the."2A", RBCU was out of service, both -
F
.-Reactor: BuildingJspray system and ~ the two remaining Reactor' Building cooling units!were operable as required 'byf oconee Technical' Specification 3.3.6(b).
-lThese. systems haveyful1~ heat. removal capability in'the event of-an ES
? actuationLand,ithereforci 'it. is. concluded that -the health and safety of
. the. public were. not affected by this incident.'
LCorrective Action:
1
[
The high1 speed : starter finger contact was repaired and the "2A" RBCU was t
iverified ' operable.QThel Unit 2 RBCU's -are scheduled for preventive mainte-inancelinspections'during(the-Unit:2 refueling outage which began May 28, j
Sl977J:1Specialfattention-willibe placed.on contacts..oflthis type. '. Periodic.
. inspection of these contactors will'be performed at refueling outageaf
- e
- ::
t s '
4~
5 5"
t W
+
4 a,
.y y,4 w
.. s-:
l^ _ _
r
^ " '
q y c' f... _.]E
, - h0 f140 'I w-
~
.- p J 3" - 'y;
- zr -,
L
+
'~,
y