05000317/LER-1980-056-03, /03L-0:on 801028,performance of STP M-13-1, Inaccessible Snubber Visual Insp,Revealed Five Snubbers, 1-54-6,-6A,-7,-7A & 1-60-27 Inoperable.Caused by Loss of Hydraulic Oil.Mods Completed

/03L-0:on 801028,performance of STP M-13-1, Inaccessible Snubber Visual Insp,Revealed Five Snubbers, 1-54-6,-6A,-7,-7A & 1-60-27 Inoperable.Caused by Loss of Hydraulic Oil.Mods Completed

ML19345B803
Person / Time
Site:	Calvert Cliffs
Issue date:	11/28/1980
From:	Miernicki M, Wenderlich R BALTIMORE GAS & ELECTRIC CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19345B786	List: 05000317/LER-1980-056, Forwards LER 80-056/03L-0 05000317/LER-1980-056-03, /03L-0:on 801028,performance of STP M-13-1, Inaccessible Snubber Visual Insp,Revealed Five Snubbers, 1-54-6,-6A,-7,-7A & 1-60-27 Inoperable.Caused by Loss of Hydraulic Oil.Mods Completed
References
LER-80-056-03L, LER-80-56-3L, NUDOCS 8012020530
Download: ML19345B803 (2)

LER-1980-056, /03L-0:on 801028,performance of STP M-13-1, Inaccessible Snubber Visual Insp,Revealed Five Snubbers, 1-54-6,-6A,-7,-7A & 1-60-27 Inoperable.Caused by Loss of Hydraulic Oil.Mods Completed

Event date:
Report date:
3171980056R03 - NRC Website

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$0 EVENT DESCRIPTION AND PRC8ABLE CONSEQUENCES h Io i2i l Durino Mode 6 onerations, while oerfonnino STP M-13-1. Inaccessible I

Snubber Visual Inspection, discovered 5 snubbers inocerable oer T.S.

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All snubbers were returned to service orior to Mode 4 ooer-I ITTTlI ation. This event had no imoact upon the public health or safety.

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I CAUSE DESCRIPTION AND CORRECTIVE ACTloNS liloti Snubbers 1-54-6,1-54-6A.1-54-7.1-54-7A and 1-60-27 were declared in-I L1_Li,j l coerable as a result of a loss of hydraulic oil.

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50-317 LICENSE NO. DPR-53 EVENT DATE 10-28-80 REPORT DATE 11-28-80 ATTACHMENT CAUSE DESCRIPTION AND CORRECTIVE ACTIONS (CONT'0)

Snubbers 1-54-6,1-54-6A,1-54-7, and 1-54-7A were tested and determined to be inocerable when discovered with their oil reservoir level below the minimum acceptable value. Although the source of leakaae could not be determined, it probably was from a tubing connection in the tubing manifold from the sinale remote reservoir serving these snubbers. This installation was nodified by FCR 78-1017 so that each of these snubbers is now served by its own integral reservoir.

Snubber 1-60-27 was discovered with a broken 5 inch oice fitting where it entered the valve block and was declared inocerable. This failure was orobably the result of overtichtening of the pice fitting causing stress cracks. Vibration during operation then caused the fittinc to sever with the loss of the hydraulic oil. Maintenance personnel who work on snubbers have been cautioned not to overtichten the various snubber pipe fittings.

(ITT Grinnell Fig. 200/201).