ML19317D950
| ML19317D950 | |
| Person / Time | |
|---|---|
| Site: | Oconee  |
| Issue date: | 03/12/1975 |
| From: | DUKE POWER CO. |
| To: | |
| Shared Package | |
| ML19317D945 | List: |
| References | |
| RO-269-75-03, RO-269-75-3, NUDOCS 7912100630 | |
| Download: ML19317D950 (1) | |
Text
'
ct
~
q s
s
/
DUXE PC'. ER CO:':'A:N OC0::TE C l! l nenort Mo.:
UE-269/ 75-3 Report D,te:
- arch 12,1975 3-l.%7f Event Date:
February 3, 1975 Facility: Oconee Unit 1, Seneca, South Carollaa Identif.4eition of Event:
Failure of emergency hatch interlocks Conditions Prior to Event:
Unit in cold shutde.sn Descr', tion of Event:
On February 3,1975, entry to the Oconee Unit 1 Reactor Building was attemptcl through the emergency hatch while the personnel hatch leak rate test was in prograsa.
In atten? ting the entry from outside containment, the operator turned the handwhcel in the wrong direction and opened the inner docr.
In attempting to close the inner door, the interlock mechanism became out of alignment and resulted in the outer door opening at the same time the inner door was open.
Attempts to close either door were unsuccessful.
Designation of Angarent Cause of Event:
The apparent cause of this event was the failure of the hatch interlock mechanism uhich permitted both doors of the hatch to be opened si=altanuously.
Analysis of Event:
The unit was in cold shutdown at the time of this incident; hence,.ontain-ment integrity was not required.
This incident did not affect the health and safety of the public.
Corrective Action:
The interlocks were adjusted and the emergency hatch was returned to service.
A preventative maintenance program is being developed, in conjunction with the designer of the hatch, which will provide periodic surveillance of the personnel and emergency hatches to prevent future recurrence of this incident.
This program will be implemented by May 1, 1975.
In addition, an investi-gation is in progress to determine the necessity for modifications to the personnel and emergency hatch interlock mechanism.
7 912100 $30
.