05000366/LER-1981-025-03, /03L-0:on 810403,loss of Secondary Containment Occurred During Normal Operation.Caused by Inadvertent Drilling Through Containment Wall for Pipe Penetration.Hole Sealed W/Thaxton Plug & Tested

/03L-0:on 810403,loss of Secondary Containment Occurred During Normal Operation.Caused by Inadvertent Drilling Through Containment Wall for Pipe Penetration.Hole Sealed W/Thaxton Plug & Tested

ML20003G618
Person / Time
Site:	Hatch
Issue date:	04/23/1981
From:	Nix R GEORGIA POWER CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20003G615	List: 05000366/LER-1981-025, Forwards LER 81-025/03L-0 05000366/LER-1981-025-03, /03L-0:on 810403,loss of Secondary Containment Occurred During Normal Operation.Caused by Inadvertent Drilling Through Containment Wall for Pipe Penetration.Hole Sealed W/Thaxton Plug & Tested
References
LER-81-025-03L, LER-81-25-3L, NUDOCS 8104300268
Download: ML20003G618 (2)

LER-1981-025, /03L-0:on 810403,loss of Secondary Containment Occurred During Normal Operation.Caused by Inadvertent Drilling Through Containment Wall for Pipe Penetration.Hole Sealed W/Thaxton Plug & Tested

Event date:
Report date:
3661981025R03 - NRC Website

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60 GI DOCKET NUMBE R bd 63 EVENT DATE 74 75 REPORT DAT E 30 EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h l0 l2l l During normal operation, a loss of Secondary Containment occurred on l

lO i3l l Unit I.

A Limiting Condition for Operation was established on Unit II i

l0 l4j l per Tech Specs 3.6.5-1, which states that Unit I must maintain Secondary l

lO isl l Containment when Unit II is at power. A similar event was reported l

lO lc j l on Reportable Occurrence No. 50-366/1980-142.

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40 41 42 43 44 47 CAUSE DESCRIPTION AND CORRFcflVE ACTIONS IiloIl During installation of the Torus Clean-up System, Secondary Containment I

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i 3 l "G" of UMP-1-3653, Stand-by Gas Treatment Operability Test, was performed l

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LER No.: 50-366/1981-025 Licensee: Georgia Power Company facility: Edwin I. Hatch Docket No. : 50-36G

Narrative

Report for LER 50-366/1981-025.

On April 3,1981, with the reactor at 96% power, a loss of Secondary Containment occurred on Unit I. This placed a Limiting Condition for Operation on Unit 11 per Tech Specs Section 3.6.5-1, which states that Unit I must maintain Secondary Containment when Unit II is at power.

A similar event was reported on Reportable Occurrence No. 50-366/1980-142.

Contract personnel were performing required activities for the installation of the Torus Clean-up System.

Secondary Containment was inadvertently broken as a pipe penetration was drilled from the Turbine Building into the Reactor Building. A Thaxton Plug was used to seal the penetration and Section "G" of HNP-1-3653, Stand-by Gas Treatmeat Operability Test, was performed satisfactory and Secondary. Containment was proven operable at 1245 on April 3, 1981.

The generic review did not reveal any inherent problems.

However, to prevent an event of this nature from re-occurring, personnel have been instructed on the proper methods for core drilling when the possibility of breaking Secondary Containment exists.

Public health and safety were not affected by this incident.

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