ML19257D701

LER 80-003/01T-0:on 800116,during Inservice Insp on Core Spray Sparger Piping for Sys Ii,Two Indications of Cracks Discovered.Ultrasonic Test Revealed through-wall Cracks. Possibly Caused by Sparger Installation Method

ML19257D701
Person / Time
Site:	Oyster Creek
Issue date:	01/30/1980
From:	Ross D JERSEY CENTRAL POWER & LIGHT CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19257D694	List: ML19257D693 ML19257D701
References
LER-80-003-01T, LER-80-3-1T, NUDOCS 8002050484
Download: ML19257D701 (3)

Text

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60 61 DOCKET NVusER 68 29 EVENT DATE 14 75 REPORT DATE 50

~~j EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h j o 2 l On Jarruary 16, 1980, while performing inservice inspection on the core

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o 3 l spray sparger piping for System II, two indications were d'iscovered.

j o 4 l These indications were subsequently evaluated and determined to be An air test performed on the sparger indicated that the crack  ;

oIs l c ra cks.

ro e l indications may not be through-wall as evidenced by lack of air penetra- g An ultrasonic test performed later on the areas in question det- y Ql? l tion.

ectec through wall cracks. This is a R.0. as defined by T.S.6.9.2.A.9 j

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42 lNl@ l A l6 l6 l1 l 43 44 47 35 36 cAUSE DESCRIPTION AND CORRECTIVE ACTIONS Thev 1 O I The cause of the indications is beino investicated at this time.

have been caused by the methods used to install the sparcers. Corr-iis i may

, 7 l ective action will be determined after a full investigation is complete.

i , I i e i e 7 8 9 CTH ER STATUS DI O RY DISCOVERY DESCRIPTION ST A  % POWER j

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1 s e to Donald A. Ross PHONE.

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,, ,,y.c Jersey Central Power & Ught Company 1 ]( . .yf f' ( J"" y Madison Avenue at Punch Bowl Road Mornstown, New Jersey 07960 (201)455-8200 OYSTER CREEK NUCLEAR GENERATING STATION Forked River, New Jersey 08731 Licensee Event Report Reportable Occurrence No. 50-219/80/3-IT Report Date January 30, 1980 Occurrence Date January 16, 1980 identification of Occurrence Discovery of two crack indications in the core spray sparger piping.

This event is considered to be a reportable occurrence as defined in the Techni-cal Specifications, paragraph 6.9.2,A,(9).

Conditions Prior to Occurrence The plant was in a refueling shutdown.

Mode switch in refuel with reactor coolant less than 212*F.

Description of Occurrence On Wednesday, January 16, 1980, while performing inservice inspection on the core spray sparger piping for System II, two indications were discovered.

These indications were subsequently evaluated and determined to be cracks.

Investigation revealed that the first indication is located at an azimuth approxi-mately 152* and adjacent to the sparger header branch weld. The indication appears to extend approximately 120* circumferentially.

The second indication is located at an azimuth approximately 170*. This indi-cation runs at an angle of approximately 30*-40* to the centerline of the sparger and is approximately 2-3 inches in length with two branch indications running vertically for approximately 2 inches.

On January 16, 1980, an air test was performed on the sparger. This test indi-cated that the crack Indications may not be through-wall as evidenced by lack of air penetration.

1875,156 Jersey Central Power & Light Company is a Member of the General Pubhc Utilities System

Reportable Occurrence No. 50-219/80/3-IT Page 2 January 30, 1980 Subsequent to that test, an ultrasonic test was performed on the areas in ques-tion. The first area was located at approximately 152* and a through-wall crack was detected in the heat affected zone (haz) of the header branch weld.

The second area was located at apreoximately 170* where additional through-wall cracking was detected.

Apparent Cause of Occurrence The cause of the indications is being investigated at this time.

Installation raethods may have been the cause.

Analysis of Occurrence Cracking of the core spray sparger in the areas found to have indications could possibly cause a loss of redundancy in the core spray systems should a complete break occur. A complete break and separation of the piping could reduce the capability of the Core Spray System 11 to adequately wet the core during a LOCA condition. Further investigation of the indications and analysis of the con-sequences 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.

1875 157,