05000325/LER-1981-046-03, /03L-0:on 810414,after 1A Loop of RHR Was Placed Into Torus Recirculation Mode for Taking Sample,Snubber 1-E11-4755326 Found to Have Broken Shaft.Caused by Water Hammer Event.Snubber Repaired

/03L-0:on 810414,after 1A Loop of RHR Was Placed Into Torus Recirculation Mode for Taking Sample,Snubber 1-E11-4755326 Found to Have Broken Shaft.Caused by Water Hammer Event.Snubber Repaired

ML20003H305
Person / Time
Site:	Brunswick
Issue date:	04/28/1981
From:	Poulk R CAROLINA POWER & LIGHT CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20003H298	List: 05000325/LER-1981-046, Forwards LER 81-046/03L-0 05000325/LER-1981-046-03, /03L-0:on 810414,after 1A Loop of RHR Was Placed Into Torus Recirculation Mode for Taking Sample,Snubber 1-E11-4755326 Found to Have Broken Shaft.Caused by Water Hammer Event.Snubber Repaired
References
LER-81-046-03L-01, LER-81-46-3L-1, NUDOCS 8105050512
Download: ML20003H305 (2)

LER-1981-046, /03L-0:on 810414,after 1A Loop of RHR Was Placed Into Torus Recirculation Mode for Taking Sample,Snubber 1-E11-4755326 Found to Have Broken Shaft.Caused by Water Hammer Event.Snubber Repaired

Event date:
Report date:
3251981046R03 - NRC Website

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1 10121 l Durine normal ooeration 1-e d i n e a l v nfror Pw,la innn n r into m e I o I a I l the torus recirculation mode for taking a torus sample, snubber 1-Ell-4755326 was [Tp-] l found to have a broken shaf t.

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33 34 36 36 37 40 41 42 43 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS I 1 i O I I The snubber whose damaec was representative of a water hammer event was repaired and i

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LER 1-81-46 ATTAQDfENT Facility: BSEP Unit No. 1 Date: April 14, 1981

Corrective Action

1.

The snubber was repaired, tested, and reinstalled.

2.

The steam condensing lines on both RHR loops were inspected for other damage.

3.

The system was operated in the same method as caused the failure. No signi-ficant movement or unusual conditions were observed.

Action To Prevent Recccurrence 1.

The frequency of venting of the RHR system was increased from monthly to daily until an evaluation justifies a reduction in the frequency.

2.

Venting was initiated on the steam condensing line every four hours to prevent the for=ulation of a bubble in the event there is leakage.

3.

Engineering is continuing to investigate tne cause of failure and improved isolation for the condensing line.

4.

An investigation into the failure mode of the shaft is being performed.

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