ML19289F367

LER 79-036/03L-0 on 790507:while Performing Visual Insp of Inaccessible Snubbers,Six Snubber Failed.Caused by Low Fluid Level.All Snubbers Disassembled,Inspected & Rebuilt

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: ML19289F364 ML19289F367
References
LER-79-036-03L, LER-79-36-3L, NUDOCS 7906070282
Download: ML19289F367 (1)

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(PLEASE PRINT OR TYPE ALL REQUIRED INFORMATION1 o i N C lB E lP l 2 l@l 0 0l -l 0 LICENSE 0 0l 0 0 -

0 l 025 @l264 1l 1l 1 LICE NSE T'r PE Jo 1 @l57 CAT 68 7 8 9 LICENSEE CCOE 14 15 NUV6ER CON'T 7

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RE CA 3c 9 60 Lj@l 0l 5 l 0 l -l 61 3 l 2 l 4 @l 0 l 5 l 0 l 7 l 7 l 9 lgl 0l 6 61 DOCKET NwL8gR 68 63 EVENT DATE 74 75 0 4 R E P OR T, D A T E 7 9@ 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 7 8 9 80 SYSTEV CAUSE CAUSE COYP. VALVE CODE COCE SUSCODE COMPONENT CODE SU8COCE SUSCODE 7

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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. COYPCN EN T TAKEN ACTION CN PLANT MET *CD HOURS 22 SUBVITTED FORMdt3. SUPPL ER VANUFACTURER l33X lgl34X l@ l Z l@

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44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h i o l The cause of failure in all snubbers was a low fluid level. All snubbers were dis- I i 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

, 3 l switching to mechanical snubbers in the drywell.

i 4 1 I 7 3 3 80 F ACILITY YETHOD OF STATUS  % POWER CTwER STATUS CISCOV E R Y DISCOVERY CESCRIPTION A NA i e H l@ l 0 l 0 l 0 @l l lBl@l Periodic Test ACTIVITY CO TENT RELEA3ED Cc RELEASE AVOUNT CK ACTIVITY LCCATION OF RELE ASE 1 le NA NA 7 8 9 lZ l @ l Z l@l IJ 11 44 l l 45 30 l

PERSO*. .E L E x P03L A E3 N WSEA s 1l7 0l0l0j@l TYPE @lOESCRIPTICN NA l 7 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 NA 7

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N AYE OF PREPAPEP A. C. Tollison, Jr. pag 919-457-6701 2,