ML19317E993
| ML19317E993 | |
| Person / Time | |
|---|---|
| Site: | Oconee  |
| Issue date: | 10/22/1974 |
| From: | DUKE POWER CO. |
| To: | |
| Shared Package | |
| ML19317E923 | List: |
| References | |
| RO-287-74-02, RO-287-74-2, NUDOCS 8001070791 | |
| Download: ML19317E993 (1) | |
Text
.
n
~
Duka Powar Company Oconta Unit 3 Report No: UE-287/74-2 Report Date: October 22, 1974 Event Date: September 10, 1974 Facility: Oconee Nuclear Station, Unit 3 Identificatien of Event: Modification ~of 4 Kv Switchgear.without proper authorization Conditions Prior to Event:
Startup testing below 15% power Description of Event:
on May 1, 1974 the Design Engineering Department of Duke Power Coepany originated l
Station Kodification Report (SMR) 0-225-D, which involved several =f ar altera-tions t; the 7 Kv and 4 Kv Switchgear transfer circuits. When the MR was sent to the statica on July 25, 1974 only the 7 Kv portion of the 512 had been cleared for acct =plish=cnt. This was due to the fact that the 4 Kv Switchgear was safety-related and a safety analysis had not been performed at that time.
On August 5, 1974, approval was obtained to coc=ence work on the 7 Kv Switchgear and a work request was originated.
On August 23, 1974, work was co=pleted by a Construction Departnent electrician on both the 7 Kv and the 4 Kv Switchgear under the supervision of Oconee Operations personnel.
The fact that unauthorized work had been perforced on the 4 Kv Switchgear was determined on Septe=ber 10, 1974.
Designation of Apparent Cause of Event:
The electrician in charge of the work recognized the fact that the 4 Kv portion of the Sla was =inor, since it only involved connecting cables to the switchgear for co=puter indication. However, the required safety analysis had not been completed. This event occurred as a result of personnel not following established work procedures..
1 Analysis of Event:
The modification to the 4 Kv Switchgear transfer circuits added indication of the type of transfer (rapid or delayed).
The ti=e delay in the transfer s-br=es had already been included in the 4 Kv circuits, and were not af fected by the =cdification. Therefore, this incident did not affect the safe operation of the Switchgear'or the health and safety of the public.
Corrective Action,:
The Safety Analysis of the 4 Kv portion of the SMR was co=pleted prior to dis-covering the unauthori:'d codification, therefore i==ediate corrective action was not necessary. The Mcident has been reviewed with personnel involved and thelimportance of co=plyira with established procedures has been reiterated.
t oo /076 79.L. -