ML19270G101

LER 78-021/01T-0 on 781010:while Performing Inservice Insp, Discovered Through Wall Crack on Sparger Pipe.Caused by Methods Used to Install Sparger Pipe.Corrective Action Will Be Determined After Full Investigation

ML19270G101
Person / Time
Site:	Oyster Creek
Issue date:	10/30/1978
From:	Ross D JERSEY CENTRAL POWER & LIGHT CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19270G100	List: ML19270G099 ML19270G101
References
LER-78-021-01T, LER-78-21-1T, NUDOCS 7906040253
Download: ML19270G101 (2)

Text

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7 8 60 81 DOCKET NUMBER 68 69 EVENT DATE 74 75 REPORT DATE EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h o 2 I "On October 16, 1978. while oerformino inservica InRnectinn i nc lda *ha I o a I reactor vessel, an Indication was discovered on the sparger piping for l o 4 l Core Spray System II. The Indication which was at azimuth location I o s i 208' 'In the reactor vessel' appeared to extend 180* circumferential1y l o s 1 around the pipe. It was later established that there is a through wall l o 7 I crack for about 135* of the pipe's circumference. l oI8 l I 7 8 9 80

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42 43 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h i o l It has been determined that the crack was most probably caused by the  ;

i i l methods used to install the spargers. Corrective action will be l i 2 1 determined after a full investigation is completed. I i I l 1 4 l l 7 8 9 80 ST  % POWER OTHER STATUS Di RY DISCOVERY DESCRIPTION 32 7

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2 o IY ISSUEf@lDE CRIPTIONWeekly press release - October 26. 1978 l I'lIIIIIIIIIIII 1 8 9 to 68 69 80. ;

NAME OF PREPARER n . oss PHONE: 201-455-8200 ,

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Jersey Central Power & Ught Company J N h'L .

EDH Madison Avenue at Punch Bowl Road Morristown, New Jersey 07960 (201)455-8200 OYSTER CREEK NUCLEAR GENERATING STATION Forked River, New Jersey 08731 Licensee Event Report Reportable Occurrence No. 50-219/78-21/1 T-_0_

Report Date October 30, 1978 Occurrence Date October 17, 1978 Identification of Occurrence Discovery of a crack in the core spray sparger piping. This event is con-sidered to be a reportable occurrence as defined in the Technical Specifi-cat ions, paragraph 6.9.2.a. (9).

Conditions Prior to Occurrence The plant was in a refueling shutdown. Reactor coolant less than 212*F.

Description of Occurrence On Monday, October 16, 1978, at approximately 1800 hours0.0208 days <br />0.5 hours <br />0.00298 weeks <br />6.849e-4 months <br />, an indication was discovered on the core spray sparger piping for System II.* Location of the indication was at an azimuth location of 208* in the reactor vessel.

From initial investigation, the indication appears to extend at least 180' circumferential1y around the pipe. Further investigation on October 19, 1978, established that there is a through wall crack for about 135' of the pipe's circumference.

• While performing inservice inspection'.

Apparent Cause of Occurrence Investigations into the cause of the crack have determined that the most probable cause was the methods used to install the spargers.

Analysis of Occurrence 2237 234 Cracking of the core spray sparger in the area found to have an indication could possibly cause a loss of redundaocy in the core spray systems should 1

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Jersey Central Power & Ught Company is a Member of the General Pubhc Utihties System

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Reportable Occurrence No. 50-219/78-21/1T-0 Page 2 October 30, 1978 a complete break occur. A complete break and separation of the piping could reduce the capability of the core spray system Il to adequately wet the core during a LOCA condition. Further investigation of the indication and analysis of the consequences will provide for a more firm analysis of the occurrence.

Corrective Action Corrective action will be determined after a full investigation is complete.

Failure Data Not applicable.

2237 235