05000302/LER-1981-054-03, /03L-0:on 810806,over Past Several Yrs,Various Hydraulic Snubbers Had Been Repaired for Causes Not Attributable to Specific Shutdown Activity.Caused by Cracked Aluminum Bushings.Bushings Replaced

/03L-0:on 810806,over Past Several Yrs,Various Hydraulic Snubbers Had Been Repaired for Causes Not Attributable to Specific Shutdown Activity.Caused by Cracked Aluminum Bushings.Bushings Replaced

ML20010F811
Person / Time
Site:	Crystal River
Issue date:	09/04/1981
From:	Hernandz V FLORIDA POWER CORP.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20010F807	List: 05000302/LER-1981-054, Forwards LER 81-054/03L-0 05000302/LER-1981-054-03, /03L-0:on 810806,over Past Several Yrs,Various Hydraulic Snubbers Had Been Repaired for Causes Not Attributable to Specific Shutdown Activity.Caused by Cracked Aluminum Bushings.Bushings Replaced
References
LER-81-054-03L, LER-81-54-3L, NUDOCS 8109110364
Download: ML20010F811 (2)

LER-1981-054, /03L-0:on 810806,over Past Several Yrs,Various Hydraulic Snubbers Had Been Repaired for Causes Not Attributable to Specific Shutdown Activity.Caused by Cracked Aluminum Bushings.Bushings Replaced

Event date:
Report date:
3021981054R03 - NRC Website

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LICENSEE EVENT REPORT

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60 61 DOCKET NUVBER 68 69 EVENT DATE 71 75 REPORT DATE 80 l

EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h l

10121 l At 0930 during normal operation, it was discovered that during shutdown maintenance I

activities over the past several years, various hydraulic snubbers had been repaired l

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for causes not attributed to specific shutdown activity and, therefore, are reportable l

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, as contrary to T.S.3.7.9.1.

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SUPPLEMENTARY INFORMATION REPORT:

1. 50-302/81-054/03L-0 FACILITY: Crystal River Unit 3 REPORT DATE: September 4,1981 Occurrence: August 6,1981 IDENTIFICATION OF OCCURRENCE:

Various hydraulic snubbers were discovered to have been inoperable during shutdown maintenance activities conducted over the past several years.

This created events not attributed to specific shutdown activities as required by Regulatory Guide 1.16 and, therefore, is reportable as being contrary to Technical Specification 3.7.9.1.

CONDITIONS PRIOR TO OCCURRENCE:

Mode 1 Power Operation (100%).

DESCRIPTION OF OCCURRENCE:

At 0930, during normal operation, it was discovered that during shut-down maintenance activities over the past sever 2.

years, various hydraulic snubbers had been repaired as follows:

Five snubbers have been found with cracked bushings and ware subsequently found inoperable:

RCH-63, RCH-69, RCH-90 all found during July, 1979 Inspection RCH-70 was found during March,1980 Inspection RCH-74 was found during March, 1981 Inspection DESIGNATION OF APPARENT CAUSE:

The cause of this event is attributed to cracked altininum bushings in the power piping snubbers.

An engineering investigation (REI 80 11) is being conducted to investigate snubber failures.

ANALYSIS OF OCCURRENCE:

There was no effect upon the health er safety of the general public.

CORRECTIVE ACTION

The bushings were replaced with stainless steel bushings.

Approxi-mately 25 percent of Containment Building snubbers bushings will be replaced during the Refueling Outage.

All accessible snubbers have been inspected.

FAILURE DATA:

There were five snubbers discovered to have been inoperable,and this is the fifth event reported under this Specification.