05000302/LER-1979-098-99, /99T-0:on 791021,improper Mounting Discovered for Triaxial time-history Accelograph SI-2-MAT on Containment Ring Girder.Caused by Personnel Error.Technical Assistants Instructed in Proper Installation Techniques

/99T-0:on 791021,improper Mounting Discovered for Triaxial time-history Accelograph SI-2-MAT on Containment Ring Girder.Caused by Personnel Error.Technical Assistants Instructed in Proper Installation Techniques

ML19254F507
Person / Time
Site:	Crystal River
Issue date:	10/31/1979
From:	Cooper J FLORIDA POWER CORP.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19254F506	List: 05000302/LER-1979-098, Forwards LER 79-098/99T-0 05000302/LER-1979-098-99, /99T-0:on 791021,improper Mounting Discovered for Triaxial time-history Accelograph SI-2-MAT on Containment Ring Girder.Caused by Personnel Error.Technical Assistants Instructed in Proper Installation Techniques
References
LER-79-098-99T, LER-79-98-99T, NUDOCS 7911090553
Download: ML19254F507 (2)

LER-1979-098, /99T-0:on 791021,improper Mounting Discovered for Triaxial time-history Accelograph SI-2-MAT on Containment Ring Girder.Caused by Personnel Error.Technical Assistants Instructed in Proper Installation Techniques

Event date:
Report date:
3021979098R99 - NRC Website

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SUPPLEMENTARY INFORMATION Report No.:

50-302/79-098/99T-0 Facility:

Crystal River Unit #3 Report Date:

31 October 1979 Occurrence Date:

21 October 1979 Identification of Occurrence:

Triaxial time-history accelograph SI-2-MAT inoperable greater than thirty (30) days contrary to Technical Specifica-tion 3.3.3.3 and reportable under Section 6.9.2.b.

Conditions Prior to Occurrence:

Mode 1 power operation (100%).

Description of Occurrence:

At 1900, during routine power operation, it was discovered that the triaxial time-history accelograph SI-2-MAT, located on the containment ring girder was improperly mounted follow-ing a previous maintenance activity. Further investigation revealed the the accelograph had been remounted on a hold-down nut that resulted in the accelograph being elevated above its mounting base. Maintenance restored operability on 30 October 1979.

Designation of Apparent Cause:

The cause of this event is attributed to personnel error.

SI-2-MAT was improperly mounted following a previous mainten-ance activity.

Analysis of Occurrence:

No effect upon the plant or general public.

Corrective Action

Technical maintenance personnel have been instructed of proper accelograph installation techniques.

Failure Data:

This is the first occurrence of this type reported.

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