05000324/LER-1980-091-03, /03L-0:on 801126,hydraulic Snubber 2-SW-142SS169 on Conventional Svc Water Sys Antisiphoning Structure Found W/Loose Pipe Clamp Allowing Snubber to Slide Down Pipe & Become Inoperable.Caused by Vibration Loosening Clamp Bolt

/03L-0:on 801126,hydraulic Snubber 2-SW-142SS169 on Conventional Svc Water Sys Antisiphoning Structure Found W/Loose Pipe Clamp Allowing Snubber to Slide Down Pipe & Become Inoperable.Caused by Vibration Loosening Clamp Bolt

ML19340D448
Person / Time
Site:	Brunswick
Issue date:	12/23/1980
From:	Tollison A CAROLINA POWER & LIGHT CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19340D445	List: 05000324/LER-1980-091, Forwards LER 80-091/03L-0 05000324/LER-1980-091-03, /03L-0:on 801126,hydraulic Snubber 2-SW-142SS169 on Conventional Svc Water Sys Antisiphoning Structure Found W/Loose Pipe Clamp Allowing Snubber to Slide Down Pipe & Become Inoperable.Caused by Vibration Loosening Clamp Bolt
References
LER-80-091-03L, LER-80-91-3L, NUDOCS 8012300589
Download: ML19340D448 (2)

LER-1980-091, /03L-0:on 801126,hydraulic Snubber 2-SW-142SS169 on Conventional Svc Water Sys Antisiphoning Structure Found W/Loose Pipe Clamp Allowing Snubber to Slide Down Pipe & Become Inoperable.Caused by Vibration Loosening Clamp Bolt

Event date:
Report date:
3241980091R03 - NRC Website

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50 61 COCK ET NUVSER ha 69 EVENT OATE 14 75 FILPORT DAT E 80 EVENT DESCRIPTICN AND PROBABLE CONSEQUENCES h IOI21Inuv4m. vnue4no survo411ance it was discovered that hydraulic snubber no. 2-SW-l 10131 1 142ss169_ located on the conventional service water system anti-siphoning structure l

FO'TT1 I,4 n4.,c. waa m loose nice clamo that had allowed the snubber to slide down beside the i

LO_1fj l n4 n, -a t< 4 n g t h e snubber inoperable. An event involving this snubber on Unit No. I wasl I T Ti 1 1,..,m,. coa 4n i n 1 -Rn-RO.

This event did not affect the health or safety of the publici I

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LER ATTACHMENT - RO # 2-80 91 Facility: BSEP Unit No. 2 Event Date: 11-26-80 This event is believed to be a result of vibration of the conventional service water system ar.ti-siphoning structure piping. Presently, flow disturbances through the "A" RHR heat exchanger service water discharge valve,1-E11-F068, believed caused by an imbalanced valve trim, produce vibration of the piping immediately adjacent to the valve, including the anti-siphoning piping. Plant Engineering is presently developing a modification to change the discharge valve's trim to eliminate the piping vibration problem. In addition, relocating the snubber to help extend its operating lifetime is presently under consid-eration by the Plant Engineering group. Due to the recent events involving this snubber on both units a me=orandum has been written to plant operations personnel to ensure that both snubbers are inspected on a weekly basis to detect any pro-blem that might arise in the interim period until the system piping vibration problam is eliminated.

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