ML20064E050
| ML20064E050 | |
| Person / Time | |
|---|---|
| Site: | Peach Bottom  |
| Issue date: | 10/19/1978 |
| From: | Ullrich W PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC |
| To: | |
| References | |
| NUDOCS 7811140086 | |
| Download: ML20064E050 (2) | |
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PHI 1ADELPHIA ELECTRIC CDdPANY Peach Bottom Atomic Power Station Delta, Pennsylvania 17314 October 19. 1978
[
Mr. Boyce H. Grier Office of Inspection and Enforcement Cv1 Region i e
United States Nuckmar Regulatory Commission N.
l 631 Park Avenue
]
King of Prussia, PA 19406 t
Q
SUBJECT:
REPORTABLE OCCURRENCE - PROIPT NOTIFICATION i
%:nfirming C. E. Andersen's conversation with Mr. Greenman, Region 1,
[
United States Nuclear Regulatory Commission on 10/19/78.
Referencer.
DocketNo.050-27"[/M Peach Botton Units M 3 Technical Specification.
Reference:
3.7.A5 Report No. 3-75-20/IP Occurrence Date: October 19,1978 Identification of Occurrence:
I i
Unit 3 drywell oxygen concentration exceeded Technical Specificaticar Limits' f
by 0.1%.
'landitions Prior to Occurrence:
Unit 3 operating at 100% power.
I Apparent Causu of Occurrence:
I i
Operator error.
)
Analysis of Occurrence::
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During the period while Unit 2 was being inerted following startup. Unit 3 exceeded its allowable 02 concentration of 4% by 0.1% for 2 to 3 hours3.472222e-5 days <br />8.333333e-4 hours <br />4.960317e-6 weeks <br />1.1415e-6 months <br />.
.%en this was discovered. a shutdown was initiated per Technical Sppificatio Requirements. The drywell was-depressurized and purged to bring 0 concentration back within-seceptable limits. The total time until the drywell was back within Spec. was approximately 3 hours3.472222e-5 days <br />8.333333e-4 hours <br />4.960317e-6 weeks <br />1.1415e-6 months <br />.- After the unit was back in Spec.. shutdown was ceased and reactor power returned to nc, mal.
The safety significance of this event is minimal.
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g rrwetive Action:.
Shutdown initiated and drywell purge initiatM.
Previous Failures:
3-76-55/IP and 3-76-76/IP.
Very truly yours, e
CF W. T. Ullrich, Superintendent i
Peach Bottou Atomic Power Station CEA:1jh e
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