ML112210488

LER 78-035/03L-0 on 781221:during Special Insp of Residual Heat Removal Piping Due to Unplanned Sys Startup,Snubber GBB-5-SS-215 Had Its Swivel Eye Attachment Piece Bent.Caused by Unplanned Startup

ML112210488
Person / Time
Site:	Duane Arnold
Issue date:	01/19/1979
From:	Vansickel J IES Utilities, (Formerly Iowa Electric Light & Power Co)
To:	NRC/OI/RGN-III/FO
Shared Package
ML112210487	List: ML112210486 ML112210488
References
LER-78-035-03L, LER-78-35-3L, NUDOCS 7901300082
Download: ML112210488 (3)

Text

REGULATORY INFORMATION DISTRIBUTION SYSTEM (RIDS)

ACQESSION NBR:7901300062 DOC.DATE: 79/01/19 N(CPRIZED: NO DOCKET #

( FACIL:50-331 Duane Arnold Energy Center, Iowa Electric & Power Co. 05000330 AUTH.NAME AUTHOR AFFILIATION VAN SICKEL.J. Iowa Electric Light & Power

• RECIP.NAME RECIPIENT AFFILIATION Region 3, Chicago, Office of the Director

SUBJECT:

LER 78-035/03L-0 on 781221:durinq special insp of RHR piping due to unplanned RHR Sys Startup,snubher GBB-5-SS-215 had its swivel eye attachment piece hent.Caused by unplanned startup.

DISTRIBUTION CODE: AOO2S COPIES RECEIVED:LTR ENCL J SIZE: _7_oA TITLE: INCIDENT REPORTS NOTES:

RECIPIENT COPIES RECIPIENT COPI ES ID CODE/NAME LTTR ENCL ID CODE/NAME LTTR ENCL

• ACTION: 05 BC 016 #3 4 4 I NTER NAL: 0] FI F 1 1 02 NRC PDR 1 09 IE 2 2 11 MPA 3 3 14 TA/.EDO 15 NOVAK/KNIEL 16 EEB 17 AD FOR ENGR 18 PLANT SYS BR 19 I&C SYS BR 20 AD PLA T SYS 21 AD SYS/PROJ 22 REAC SAFT BR 23 ENGR BR 24 KREGER 25 PWR SYS BR 26 VOLLMER 27 OPERA LIC BR 28 ACDENT ANLYS E JORDAN/IE EXTERNAL: 03 LPDR .1 16 04 NSIC 1 1 29 ACRS 16 16

.JANj 3 1 1979 TOTAL NUMBER OF COPIES REQUIRED: LTTR 45 ENCL 45 6W.

NRC FORM 366 U. S. NUCLEAR REGULATORY COMMISSION LICENSEE EVENT REPORT CONTROL BLOCK: (PLEASE PRINT OR TYPE ALL REQUIRED INFORMATION) 11rA ID JA IC 1 I 101 2 0 1- 1l 0 1 f1 f of10 0 1-10! 1-0(1 111111111jOL.... 1 25 26 LICENSE TYPE JO 57 CAT 58 14 Is LICENSE NUMBER 8 9 LICENSEE CODE 01RRTE L ( 0 15 10 10 10 13 311 1(The l 12 12 11 17 18 1 011111 91 7! 91D 60 61 DOCKET NUMBER 68 69 EVENT OATE 74 75 REPORT DATE 80 EVENT DESCRIPTION AND PROBABLE CONSEQUENCES During a special inspection of RHR piping conducted as a result of an un planned RHR system startup, it was discovered snubber GBB-5-SS-215 had i I ts swivel eye attachment piece bent approximately 5 degrees and restrain t GBB-5-SR-230 had its wall attachment plate pulled away from the wall a ro-7 bout 1/4 inch. Snubber operability requirements listed in Tech. Spec. Se ction 3.6.H. At the time of this occurrence the plant was inrthe cold shu ot8 down mode with all fuel removed from the reactor.

7 89 SC SYSTEM CAUSE CAUSE COMP: VALVE CODE CODE SUBCODE COMPONENT CODE SUBCODE SUBCODE 7 B IC IF I (

9 10 11 I

12 13 SL.1U1 P 10 1 RIT) 18

'LJi 19 20 Z (D6 SEQUENTIAL OCCURRENCE REPORT REVISION LERA O EVENT YEAR REPORT NO. CODE TYPE NO.

REPOR 17 L 21 22 23 I 01 315 24 26 1,-

27 l 0 1.3 28 29 L

30 31 32 ACTION FUTURE EFFECT SHUTDOWN ATTACHMENT NPRO-4 PRIME COMP. COMPONENT TAKEN ACTION ON PLANT METHOO HOURS SUBMITTED FORM SUB. SUPPLIER MANUFACTURER I.J 33 34 ZU1 35W@ Z@ Lz.JO 36 loLoLI 37 40 41 ._42 WO 43 1 Of 9(

4 0 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS 1 Primary cause of this occurrence was determined to be the unplanned RHR system startup. Due to present extended outage the RHR system had not b 2 een maintained filled and a waterhammer effect likely occurred when the RHR system was started. Contributing cause restraint misalignment. Snub ber swivel eye piece replaced. Restraint properly aligned and secured.

7 89 FACILITY METHOD OF STATUS %POWER OTHER STATUS DISCOVERY DISCOVERY DESCRIPTION DD L@ 1 01 of 0 NICO1 1, Special Inspection 7 8 9 10 12 13 4 45 ACTIVITY CONTENT RELEASED OF RELEASE A ACTIVITY) LOCATION OF RELEASE IZI I(SI NA N 7 8 9 10 1 44 45 8 PERSONNEL EXPOSURES NUMSER TYPE DESCRIPTION 1710 10 1Z 13 NA 7 9 1I 12 13 8 PERSONNEL INJURIES 8 NUMBER DESCRIPTIONS LLLOO 10 (MTO NA O 7 89 II 12,

? so SLOSS OF OR DAMAGE TO FACILITY TYPE DESCRIPTION 7 8 9 N I 10 A 3so 8 20 0 SUE ERIPTINS©NRCUSEONL 0NA IrIIINAii 7 8 9 10 6 98.

NAME NA 01.PR.JRER $

NAME OF: PREPARER J. Van Sickel PNE. 319-851-5611 PHONE:

0 0

DUANE ARNOLD ENERGY CENTER Iowa Electric Light and Power Company LICENSEE EVENT REPORT-Supplemental Data Docket No. 050-0331 Licensee Event Report Date: 790119 Reportable Occurrence No: 78-035 Event Description During a special inspection of RHR piping conducted as.a result of an unplanned RHR system startup, it was discovered that snubber GBB-5-SS-215 had its swivel eye attachment piece bent approximately 5 degrees and restraint GBB-5-SR-230 had its wall attachment plate pulled away from the wall approximately 1/4 inch.

Snubber operability requirements listed in Technical Specifications Section 3.6.H.

At the time of this occurrence the plant was in the cold shutdown mode with all fuel removed from the reactor.

Cause Description The primary cause of this occurrence was determined to be the unplanned RHR system startup. This staYtup -occurred during surveillance testing primarily due to a defective procedure. Due to the present extended outage the RHR system had not been maintained filled and a waterhammer effect likely occurred when the RHR system was started. After this unplanned startup an inspection was made of the RHR system to determine if any damage had;occurred. No significant damage other than that to snubber GBB-5-SS-215 and restraint GBB-5-SR-230 was found. A contributing cause of this occurrence may have been misalignment of restraint GBB-5-SR-230 (which is in the vicinity of snubber GBB-5-SS-215) in that the restraint was not in axial alignment with the horizontal pipe run it is designed to restrain. Both the snubber and restraint were manufactured by the Bergen Paterson Pipe Support Corp.

Corrective Action The snubber swivel eye piece was replaced and the snubber tested for lockup and bleed. The restraint wall attachment'plate was repositioned to bring the restraint in alignment with the horizontal.pipe run and properly secured.

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