ML19309G345

LER 80-017/03L-0:on 800405,during Repair of B once-through Steam Generator Feedwater swing-disc Check Valve FWV-46, Discovered Valve Disc Retainer Pin Missing.Caused by Deficiency Occurring During Initial Manufacturer Assembly

ML19309G345
Person / Time
Site:	Crystal River
Issue date:	04/29/1980
From:	Lancaster K FLORIDA POWER CORP.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19309G342	List: ML19309G341 ML19309G345
References
LER-80-017-03L, LER-80-17-3L, NUDOCS 8005060200
Download: ML19309G345 (2)

Text

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SUPPLDIENTARY INFORMATION Report No.: 50-302/80-017/03L-0 Facility: Crystal River Unit #3 Report Date: 29 April 1980 Identification of Occurrence:

Containment isolation v:<lve FWV-46 Inoperable contrary to Technical Specification 3.6.3.1.

Conditions Prior to Occurrence:

Mode 5 cold shutdown.

Description of Occurrence:

At 0100 during the repair of "B" OTSGifeedwater swing-check valve, FWV-46, it was discovered that the valve disc retainer pin was missing. The loss of the pin prevented the check valve disc from closing. Repair actions were initiated.

Designation of Apparent Cause:

The cause of this event is attributed to a deficiency occurring during the initial assembly of the valve by the manufacturer. It was determined that the set screw, which locks the hinge pin in place, was not fully inserted.

Analysis of Occurrence:

There was no hazard created for the plant or the general public as a result of this event. The plant was maintained in a stable cold shutdown condition.

Corrective Action:

Modification 80-4-63 was initiated to upgrade the retainer pin assembly. The 'dification was installed on 8 April 1980 with post modificati . testing scheduled to be completed upon restora-tion of the feedwater system. In addition, OTSG feedwater swing-disc check valve FWV-45 will be inspected to identify similar concerns in this area.

Failure Data:

This is the first occurrence of this type reported.

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