ML19317E993: Difference between revisions
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Duka Powar Company ' | Duka Powar Company ' | ||
Oconta Unit 3 Report No: UE-287/74-2 . | 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 - | 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: | Description of Event: | ||
on May 1, 1974 the Design Engineering Department of Duke Power Coepany originated | 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. | 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: | Designation of Apparent Cause of Event: | ||
' The electrician in charge of the work recognized the fact that the 4 Kv portion | ' 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.. | ||
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: | 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. | 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,: | 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. | 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. | ||
l t oo /076 79.L . -}} | l t oo /076 79.L . -}} | ||
Revision as of 07:05, 1 February 2020
| 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.
l t oo /076 79.L . -