ML20084J607
| ML20084J607 | |
| Person / Time | |
|---|---|
| Site: | Oyster Creek |
| Issue date: | 06/05/1973 |
| From: | Ross D JERSEY CENTRAL POWER & LIGHT CO. |
| To: | Anthony Giambusso US ATOMIC ENERGY COMMISSION (AEC) |
| References | |
| NUDOCS 8305180457 | |
| Download: ML20084J607 (3) | |
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Jersey Central Power & Light Company I
6 gl M ADISoN AVENUE AT PUNCH OoWL RO AD e MoRRISToWN. N.J. 07960 e 539 6111 Junc 5, 1973
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Mr. A. Giambusso Deputy Director for Reactor Projects 2
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Dear Mr. Giambusso:
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Subject:
Oyster Creek Station Docket No. 50-219 Drywell Ilead Manhole Cover The purpose of this Ictter is to report a failure of the drywell head manhole cover doubic gasket seal to meet acceptable IcaLage as specified in Technical Specifications 4.5.it.1.D.
This event is considered to be an abnormal occurrence as defined in the Technical Specifications, Paragraph 1.15.E.
Notification of this event as required by the Tech-nical Specifications, Paragraph 6.6.B, was made to AEC Region I, Direc-torate of Regulatory Operations, on May 27, 1973.
h'hile attempting to pressurize the doubic gasket seal on the dry-well head manhole cover, significant pressure decay was observed between the gaskets. A check of the manhole cover plate with leak teck showed that there was a significant amount of Icakage through the outer gasket.
No attempt was made to determine whcther the inside gasket was leak tight.
The allowable Icakage for a penetration is 10'4 of L (20) or 19.9 SCFil.
t Visual inspection of the gaskets showed that the outer gasket was brittle and would crack when pulled, but the inner gasket was less brittle and still had some resilience left when it was pulled.
Both gaskets on the manhole cover were replaced.
The test showed the outer gasket was Icaking and the visual inspection indicated that the inner gasket was sound and might have been Icak tight.
(Note this point was not verified by any measurement.)
If the inner gasket was tight, there is no particular safety significance except the lack of a l
redundant gasket seal.
The failure of both gaskets could result in primary containment Icakage (into secondary containment) in excess of technical specification (e"M 3e^S7 9305180457 730605
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Mr. Giambusso June 5, 1973 limits and in excess of the leakage assumed for off-site dose calcula-tions described in the basis for Technical Specification 4.5.
- Ilowever, there is a possibility that the inside gasket was tight and that primary containnent leakage would be less than allowabic.
To prevent recurrence of this type failure, a schedule for gasket replacement needs to be developed. This particular gasket is estimated to have been in service 4 or 5 years.
In the future, it will be replaced every 3 years since it is located in a higher temperature region of the containment.
As future experience dictates the need for gasket replace-ment in other areas of the containment, it will be factored into our replacement schedule.
Very truly yours,
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Donald A. Ross Manager, Nuclear Generating Stations DAR:cs Enclosures (40) cc:
Mr. J. P. O'Reilly, Director Directorate of Regulatory Operations, Region I t
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All Branch Chiefs except I
N WD MLE 00m Construction The enclosed report from the Jersey Central Power and Light Company to the Directorate X
of Licensing, pertaining to deterioration of the gaskets associated with the drywell head manhole cover at the Oyster Creek facility, is forwarded for your information.
y ces H. D. Thornburg, 20 X
Enclosures Jersey Central ler.
I dtd 6/5/73 X
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j JHSaissektbs JGKeppler J. R. Sniesek 6/20/73 6/20/73 6/20/73
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