ML18081A672

Updated LER 79-054/01X-1:on 790824,three Snubbers on Main Feedwater 14 During Refueling Outage Per Followup to NRC Insp Rept 50-311/79-19.Caused by Extreme Shock Load.Snubbers Replaced

ML18081A672
Person / Time
Site:	Salem
Issue date:	11/10/1979
From:	Kapple A Public Service Enterprise Group
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML18081A671	List: IR 05000311/1979019 ML18081A670 ML18081A672
References
LER-79-054-01X, LER-79-54-1X, NUDOCS 7912040395
Download: ML18081A672 (1)

Text

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• NRC FORM '365 - UP~ATE REPORT - p'Ot:A.us REPORT DATE 9 /7 /7 9 .NUCLEAR REGULATURY COMMISSION 17-771 ~~

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!During the refueling outage, as follow-up to NRC Inspection 50-311/79-19, three

(]l!J tsnubbers on No. 14 Main Feedwater were found to have failed. These_ snubbers were

[Q:rrl f included in the stress calculations for the seismic safety analysis of the nuclear

[))!] !Portion of the main feed water piping. Stress calculations indicated the increase I.

[]Jr) lin stress in the piping is small and remains well below the allowable stress rIIZJ llimit. Seismic stresses would not be affected as the snubbers would be locked

())]J !under that condition. .,

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• 7 8 9 10 '1 12 13 18 19 20 SEQUENTIAL OCCURRENCE REPORT REVISION

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CAUSE DESCRIPTION ANO CORRECTIVE ACTIONS @

jThe failure of the snubbers appears to be an extreme shock load or occurred when o::DJ tthe snubber was in the fully retracted condition. The snubbers were replaced in kindj o::IiJ I and corresponding snubbers on No~ 11, 12 and 13. lines were checked satisfactory *

.OJI) I I.nstrumentation will be installed to measure and record acceleration and linear

[!I!J !displacement of the piping at the snubber location.

7 8 9 BO FACILITY IJQ\ METHOD OF (.;;\

STATUS. 1' POWER O'ER STATU.S \;;:::/ DISCOVERY DISCOVERY DE$Cl'lll"fl0N ~

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• . RELEASED OF RELEASE AMOUNT OF ACTIVITY ~ . LOCATION OF REL.EASE @

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NUMBER ~TYPE~ DESCRIPTION~

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DESCRIPTION~

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NUMBER 7 8 SI tt 12 BO L.OSS OF OR DAMAGE TO FACILITY TYPE DESCRIPTION 1.i3'

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