05000324/LER-1979-036-03, /03L-0 on 790507:while Performing Visual Insp of Inaccessible Snubbers,Six Snubber Failed.Caused by Low Fluid Level.All Snubbers Disassembled,Inspected & Rebuilt

/03L-0 on 790507:while Performing Visual Insp of Inaccessible Snubbers,Six Snubber Failed.Caused by Low Fluid Level.All Snubbers Disassembled,Inspected & Rebuilt

ML19289F367
Person / Time
Site:	Brunswick
Issue date:	06/04/1979
From:	Tollison A CAROLINA POWER & LIGHT CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19289F365	List: 05000324/LER-1979-036, Forwards LER 79-036/03L-0 05000324/LER-1979-036-03, /03L-0 on 790507:while Performing Visual Insp of Inaccessible Snubbers,Six Snubber Failed.Caused by Low Fluid Level.All Snubbers Disassembled,Inspected & Rebuilt
References
LER-79-036-03L, LER-79-36-3L, NUDOCS 7906070282
Download: ML19289F367 (1)

LER-1979-036, /03L-0 on 790507:while Performing Visual Insp of Inaccessible Snubbers,Six Snubber Failed.Caused by Low Fluid Level.All Snubbers Disassembled,Inspected & Rebuilt

Event date:
Report date:
3241979036R03 - NRC Website

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/l LICENSEE EVENT REPORT CONT 3OL BLOCK: l l

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l l lh (PLEASE PRINT OR TYPE ALL REQUIRED INFORMATION1 6

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7 8 9 LICENSEE CCOE 14 15 LICENSE NUV6ER 25 26 LICE NSE T'r PE Jo 57 CAT 68 CON'T 0

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d 60 61 DOCKET NwL8gR 68 63 EVENT DATE 74 75 R E P OR T, D A T E 50 EVENT DESCRIPTION AND PROB ABLE CONSEOUENCES h o

2 l While performing PT 19.6.0.1, Visual Inspection of Inaccessible Snubbers, six snubberd o

3 l failed. These snubbers were 1) 2B21-74SS156, RPV vent; 2) 2B21-44SS146, Rx. head ventj e

2 l to Clean Radwaste; 3) 2B21-701SS164, reactor vessel level instrument; 4) 2B21-701SS184 o

3

reactor vessel instrument line; 5) 2B21-34SS300, main steam relief valve F013H dis-l 0

6 l Charges; 6) 2PS-361S, sample line. As a result of these failures, surveillance fre-1 ol7 quencies have been changed per Technical Specifications.

I o

3 l Technical Specifications 3.7.5 and 6.9.1.9b.

I 80 7

8 9 SYSTEV

CAUSE

CAUSE COYP.

VALVE CODE COCE SUSCODE COMPONENT CODE SU8COCE SUSCODE o

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3 to 11 12 13 18 19 20 SEQUEN TI AL CCCURRENCE REPCRT R EVISIO N

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CCDE TYPE NO.

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_ 21 22 23 24 26 27 28 29 30 31 32 ACTION EvTURE EFFECT SHUTOOWN ATT ACHV EN T NP R O.4 PRIVE COMP.

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N 33 25 36 31 40 41 42 43 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h l The cause of failure in all snubbers was a low fluid level.

All snubbers were dis-I i

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l assembled, inspected, and rebuilt.

Seal leakace has been a nroblen in the we da I hydraulic snubbers in the drywell.

We are currently investigating the feasibility of i l switching to mechanical snubbers in the drywell.

3 1

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4 7

3 3 80 F ACILITY YETHOD OF STATUS

% POWER CTwER STATUS CISCOV E R Y DISCOVERY CESCRIPTION A

H l@ l 0 l 0 l 0 @l NA l

lBl@l Periodic Test i

e ACTIVITY CO TENT RELEA3ED Cc RELEASE AVOUNT CK ACTIVITY LCCATION OF RELE ASE 1 le lZ l @ l Z l@l NA l

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7 8 9 IJ 11 44 45 30 PERSO*..E L E x P03L A E3 N WSEA 1l7 0l0l0j@l TYPE @lOESCRIPTICN l

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3 9 11 12 13 E0 PE A SON'.E L, yUn tES NUYPER C E SCR.PTON t

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8 9 11 12 80 LO35 OF OP DC.' AGE TO F ACILITY TYPE CE3C AlPTION Z l@l NA 0

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A. C. Tollison, Jr.

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