ML20052H687

LER 81-063/03L-1:on 811005,various Snubbers Discovered Inoperable.Addl Inoperable Snubbers Identified 811014-1211. Caused by Debris in Hydraulic Fluid,Air Entrapment Through Seals & Untempered Radial Bearings.Snubbers Rebuilt

ML20052H687
Person / Time
Site:	Crystal River
Issue date:	05/12/1982
From:	Charles Brown FLORIDA POWER CORP.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20052H678	List: ML20052H677 ML20052H687
References
LER-81-063-03L, LER-81-63-3L, NUDOCS 8205210340
Download: ML20052H687 (2)

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e* SUPPLEMENTARY INFORMATION

's Report No.: 50-302/81-063/03L-Facility: Crystal River _ Unit 3 Report Date: May 12, 1982 Occurrence Date: October-5, 1981 Identification of Occurrence:

Various hydraulic snubbers were discovered to have been inopera-bic during shutdown surveillance activities. These events were not attributed to specific shutdown activities as required by Regulatory Guide 1.16, therefore, they are being reported as con-trary to Technical Specification 3.7.9.1.

Conditions Prior to Occurrence:

Mode 5 cold shutdown (0%).

Description of Occurrence:

From October 14 through December 11, 1981, during performance of SP-300, Hydraulic Snubber Functional Testing, seventy-five (75) out of one hundred-sixty (160) snubbers tested did not meet the acceptance criteria specified in MP-130, Pipe Snubber Maintenance. Failure modes were determined and are reportable as follows: a) fif ty-two (52) snubbers failed to meet bleed rate acceptance criteria; b) fourteen (14) snubbers failed to meet locking velocity acceptance criteria; and c) one snubber was determined to be inoperable due to a shattered radial bearing; d) eight snubbers failed'to meet shock load acceptance criteria.

-Designation of Apparent Cause:

Failures were due to the following causes: a) debris in the hydraulic fluid; b&c) air entrainment through snubber seals; d) untempered radial bearings used.

Corrective Action:

The following snubbers have been rebuilt complete with new fluid, seals, required hardware (including stainless steel bushings and heat treated radial bearings; one hundred ' sixty-six (166) snubbers located inside the Reactor Building. The remaining sixty-eight (68) snubbers will be rebuilt over the next six months as parts become available.

Failure Data:

This is the sixth report under this Specification.

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