ML19317F466
| ML19317F466 | |
| Person / Time | |
|---|---|
| Site: | Oconee  |
| Issue date: | 11/12/1976 |
| From: | DUKE POWER CO. |
| To: | |
| Shared Package | |
| ML19317F462 | List: |
| References | |
| RO-270-76-14, NUDOCS 8001140699 | |
| Download: ML19317F466 (1) | |
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Report No.: R0-270/76-14 Report Date: November.12,1976 p
d Occurrence Date_: October 13, 1976 Oconce Unit 2, Seneca, South Carolina Facility:_
Failure of Reactor Building electrical Identification of Occurrence: penetration WMV-1 Unit at 60 percent full power Conditions Prior to O__currence:
c Description of Occurrence:
On October 13, 1976, while performing monthly SF6 gas pressure tests to it was verify the integrity of Reactor Building electrical penetrations, determined that penetration WMV-1, a Type A electrical penetration for the I
SF6 is used as 2B1 reactor coolant pump motor, indicated zero pressure.
a quenching agent and is normally maintained at a pressure d 50 psig or Reactor coolant pump 2B1 was secured greater for this type penetration.and the repairs to the penetration were initiate Pursuant to Oconee Technical Specificacion Specification 4.4.1.2.4.a.4.4.1.2.4.b and station procedures, reactor shutdown wa percent per hour forty eight hours after discovery of the defective penetra-Conformance to the criteria of Oconce Technical Sp cification tion.
4.4.1.2.3 was demonstrated within 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> of initiation or' shutdown by a
'icak rate test on WMV-2 and reactor shutdown was termir.ated.
Designation of Apparent Cause of Occurrence:
The apparent cause of this occurrence was a cracked bushing in the electrical penetration on the Reactor Building side allowing SF6 gas to escape.
Analysis of Event _:
Visual inspection indicated that the penetration was leaking only on the Additionally, leak tests verified that the outer Reactor Building side.
ceramic bushings were intact and would have provided containment integrity it is concluded that the health and safety of the if required..Therefore, public were not affected by this occurrence.
Corrective Action _:
The cracked bushing was replaced with the penetration in place and subse-The welding procedure used to repair penetra-quently tested for leakage.
tions of this type has been revised to replace the purge gas, argon, with r
This will result in a helium due to helium's superior purging qualities.
No further corrective action is considered necessary shorter repair time.
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at this time.
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