ML20087A628
| ML20087A628 | |
| Person / Time | |
|---|---|
| Site: | Oyster Creek |
| Issue date: | 10/20/1969 |
| From: | Robert Carlson US ATOMIC ENERGY COMMISSION (AEC) |
| To: | James O'Reilly US ATOMIC ENERGY COMMISSION (AEC) |
| Shared Package | |
| ML20086U000 | List:
|
| References | |
| FOIA-95-36 NUDOCS 9508070092 | |
| Download: ML20087A628 (2) | |
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October 20, 1969
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,J. P. O'Reilly, Chief, Reactor Inspection & Enforcement Br.,
. Division of Compliance,-Headquarters INQUIRY MEMORANDUM J3RSEY CENTRA 7, POWER & LIGHT COMPANY (OYSTER CREEK 1), 219/69-F FAILURE (TWO INSTANCES) OF ONE INCH LINES ON CLEANUP SYSTEM
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HEAT EXCHANGERS During an inspection at the Oyster Creek 1 reactor facility on September 29-30, 1969, the follwing information was obtained concerning the failure of two one-inch lines that connect to cleanup system heat exchangers.
&ICENSEE:
Jersey Central Pwer & Light Company FACILITI:
oyster Creek 1 Dh_g :
September 19, 1969 ENFORCEMENT:
No REPORTAnus No
REFERENCES:
CO Report No. 219/69-9 DESCRIPTION:
There have been two instances where one-inch lines that were screwedd into nipples in cleanup system heat ex-changers were found broken in the heat effected zone of a seal weld.
The lines were long, unsupported and connected to relief valves.
The most recent rupture occurred on September 19,1969, during neclear hcanup.
The reactor levell dropped from an indicated 7.4 feet to 6.7 feet before the cleamp loop was isolated, less than 30 seconds.
Hwever, the water level was only lw for about six seconds.
Other than dumping a considerable amount of water on the refueling building floor, the occurrence i
did not significantly affect operations.
- gggg, Since the one-inch lines were long and unsupported, the cause of the breaks was attributed to pipe vibration from frequent relief valve operation.
The cleanup system heat ex-gl changers, which were manufactured by SWECO, came equipped with f'g the relief valves and associated n==uppare..a ur-m ynes,
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.2-SIGNIFICANCE:
The ruptured lines allowed an inadvertent release i
of coolant.
However, the cleanup system can be easily isolated before any significant loss of primary coolant occurs.
Th preclude this type of failure in the future, all of these type lines have been or will be properly supported.
This problem could be prevalent atother facilities that have cleanup system heat exchangers that have been manufactured by SWECO.
This is known to be the case at Nine Mile Point.
This matter has been pursued with the licensee at that facility and corrective action is reported to be underway.
,R. T. Carlson Senior Reactor Inspector cc:
E. G. Case, DRS R. S. Boyd, DRL (2)
- 8. Levine, DRL D. J. Skovholt, DE (2)
L. Kornblith, Jr., CO REG File
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