ML19317F372
| ML19317F372 | |
| Person / Time | |
|---|---|
| Site: | Oconee  |
| Issue date: | 12/05/1975 |
| From: | DUKE POWER CO. |
| To: | |
| Shared Package | |
| ML19317F366 | List: |
| References | |
| RO-287-75-12, NUDOCS 8001140624 | |
| Download: ML19317F372 (1) | |
Text
.
n.
w
- ,m
- .g. 3 DUKE POWER. COMPANY flf e,.1
^
x
.,,m
~ OCONEE NUCLEAR STATION-
~ %-
e g" g4%w..,f]? g00'h,.:. r;;;.
i M
- Report No.~:1 UE-287/75-12~
(Report Date:. December l5, 1975:
a w. ; d,. p g7( '
- k.. &
.a
.m i Event Date:- ! November 5,- 1975 '
' Facility: LOconee UnitV3, Seneca,; South' Carolina Identification of-Event: Failure of gasket.'on personnel hatch inner daor Conditihns Prior to Event:.Uniti at.95% full power
~
Description'of Eventi.^
b 60n No' ember.5,51975b a' leak rate' test was performed on Oconee Unit 3 P
v
.. personnel sitch. ;After pressurizing the hatch to 50 psig,s it was observed that theLinner; door gasket had failed.. Further testing was immediately J
discontinued, and the outer personnel hatch door.was locked in the closed position.
Apparent'~Cause of Event:'
-The personnel _hatchileak rate test is performed by pressurizing.the area 1between the'innerfand outer' doors. - The. test tends to unseat the inner door; 4
.therefore. strongbacks'are placed on.the' hatch' side of the inner door to
-maintain the door:.in a; closed condition.- The apparent cause of this incident
~
was the unseating of the inner' door by.the test pressure, resulting in failure ofLtheigasket.
. Analysis of Event:
?The. failure of the personnel hatch inner door gasket resulted'in the loss of' Lintegrity-;of theLinner door..However, it'is highly probable that this: door.
would;have functioned properly during a loss-of-coolant' accident since
~
-contninment pressure.tends to seat the inner door, compressing the' gasket.
Addit'ionally,; the outer door.is: capable.of maintaining containment -integrity.
(
Itsisiconcluded that!the health and safety of the.public was not affected.
iCorrective Action:?
iThei personnel hatch outer ' door was locked clcsed, pending approval'of-a change -
~
~
~
to.0coneelTechnical' Specific'ation'3.6.4.
This change was received on November)11,-.1975 and: permitted:the outer door toLbe opened during power operation:for a maximum ten-minute' interval.to permit access.for= repair of.'
- (the faulty 31anerfdoor: gasket.. The inner door gasket was replaced, and'the fhatch successfully.. tested'on November' 12,[1975.
0
-Ne..
9 4
'd
'_"E_
'm..
?
k 9
i T
'rN[
r/
m-p-
b et j
a w 1 + e -a
^e
.e
--se - s' e-n--S g'
er 4 W
f'P*'
ti " rW " ' '
- 9%"'P' f
e
'