05000250/LER-1979-017-03, /03X-1 on 781218:during Normal Operation,Efforts Were Made to Determine Source of Intermittent Radioactive Gas Leak.Caused by Possible Deformation of Small Section of Tank Shell.Defect Will Be Repaired

/03X-1 on 781218:during Normal Operation,Efforts Were Made to Determine Source of Intermittent Radioactive Gas Leak.Caused by Possible Deformation of Small Section of Tank Shell.Defect Will Be Repaired

ML17338B043
Person / Time
Site:	Turkey Point
Issue date:	08/10/1979
From:	Schoppman M FLORIDA POWER & LIGHT CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML17338B042	List: 05000250/LER-1979-017-03, /03X-1 on 781218:during Normal Operation,Efforts Were Made to Determine Source of Intermittent Radioactive Gas Leak.Caused by Possible Deformation of Small Section of Tank Shell.Defect Will Be Repaired
References
LER-79-017-03X, LER-79-17-3X, NUDOCS 7908290429
Download: ML17338B043 (3)

LER-1979-017, /03X-1 on 781218:during Normal Operation,Efforts Were Made to Determine Source of Intermittent Radioactive Gas Leak.Caused by Possible Deformation of Small Section of Tank Shell.Defect Will Be Repaired

Event date:
Report date:
2501979017R03 - NRC Website

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'acKET NvlISER EVENT DESCRIPTION AND PROBABLE-CDNSPCUSNCSS QIO During normal operations efforts were Q~It Q EVENTCATE AS>QRT OATS being made to determine the source of an intermittent radioactive gas leak. It was determined that the leak could be associated 'with reactor coolant letdown to CVCS holdup tank A, up tank rupture is discussed in FSAR section 14.2.2 and would not adversel but not to tanks B and C.

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REPORTABLE OCCURRENCE 250-78-17, UPDATE 1 LICENSEE EVENT REPORT PAGE TWO Additional Cause Descri tion and Corrective Action During the final stages of the repair effort on March 16, 1979, the. A CVCS holdup tank was filled in preparation for a hydrostatic test,.

Prior to pressurization, the tank was isolated in preparation for "gagging" the reLief-'alve.

Zn the interval between isolation and the hydrostatic test, the level in the A CVCS holdup tank was noted to be decreasing while the level in the B CVCS holdup tank was increasing.

A CVCS holdup tank pressure decreased to below atmospheric and cover gas was reapplied.

The level of activity revealed that the A CVCS holdup tank had buckled side walls with minor ruptures.

The cause of the event was most probably due to leakage through drain header valves from the A CVCS holdup tank to the B CVCS.holdup tank.

This resulted in low internal tank pressure and subsequent collapse.

The resulting release was a gaseous mixture with a total activity of 31curies; this represents 0.033% of the quarterly gas release limit.

Corrective action will include repair of the defect and evaluation of cover pressure control and monitoring methods.

Tank Data:

13,000 ft 15 psig internal pressure 200 F 0 psig external pressure

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