ML17334B820

Part 21 Rept Re Defective & Missing Welds Found on Ice Basket Bottom Cross Bar & Bottom Basket Grids During Insp of Unit 1 Ice Condenser.Investigation Ongoing.Defective Ice Basket Bottom Rims Will Be Repaired or Replaced

ML17334B820
Person / Time
Site:	Cook
Issue date:	06/23/1998
From:	Kelly M UNION ELECTRIC CO.
To:	NRC
References
REF-PT21-98 NUDOCS 9807170287
Download: ML17334B820 (5)

Text

CATEGORY 1 REGULAT

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Y INFORMATION DISTRIBUTION SYSTEM (RIDS)

ACCESSION NBR:9807170287 DOC.DATE: 98/06/23 NOTARIZED: NO DOCKET FACIL:50-315 Donald C. Cook Nuclear Power Plant, Unit 1, Indiana M 05000315 50-"'16 Donald C. Cook Nuclear Power Plant, Unit 2, Indiana M 05000316 AUTH.NAME AUTHOR AFFILIATION KELLY,M. Union Electric Co.

RECIP.NAME RECIPIENT AFFILIATION NRC - No Detailed Affiliation Given

SUBJECT:

Part 21 rept re defective & missing welds found on ice basket bottom cross bar & bottom basket grids during insp of unit 1 ice condenser. Investigation ongoing. Defective ice basket bottom rims will be repaired or replaced.

DISTRIBUTION CODE: IE19T COPIES RECEIVED:LTR ENCL SIZE:

TITLE: Part 21 Rept (50 DKT)

NOTES:

RECIPIENT COPIES RECIPIENT COPIES ID CODE/NAME LTTR ENCL ID CODE/NAME LTTR ENCL PD3-3 PD STANG, J INTERNA~:t: TER NRR/DRPM/PECB NRR/DR PECB/B PDR WARD, M.

RES/DET/EIB RGNl RGN2 RGN3 RGN4 EXTERNAL: INPO RECORD CTR NOAC SILVER,E NRC PDR NUDOCS FULL TXT D U

N THIS DOCUMENT HAS BEEN ~Ca.t lP~g NOTE TO ALL "RIDS" RECIPIENTS:

PLEASE HELP US TO REDUCE WASTE. TO HAVE YOUR NAME OR ORGANIZATION REMOVED FROM DISTRIBUTION LISTS OR REDUCE THE NUMBER OF COPIES RECEIVED BY YOU OR YOUR ORGANIZATION, CONTACT THE DOCUMENT CONTROL DESK (DCD) ON EXTENSION 415-2083 FULL TEXT CONVERSION REQUIRED TOTAL NUMBER OF COPIES REQUIRED: LTTR ENCL 15

It Reportability Retluirement This is Mark Kelly from Atnerican Electric Power, D.C. Cook Units 1 and 2, calling with an initial NRC notification that event number 34427, previously rcpor(ed by D, C. Cook on June 23, 1998, has been determined to also bc reportable under 10 CFR Part 21.

I The component supplier (Westinghouse) has been provided a copy of this rcport. A

'tten 10 CFR Part 21 report will be submitted by August 10, 1998.

,* THE FOLLOWING WAS REPORTED ON JUNE 23, 1998 AS EVENT 434427 ~~~

Background

The ice condenser consists of 24 buoys, each of which contain 81 ice baskets for a tota1 of 1,944 ice baskets per unit. The ice baskets are approximately 48 feet high and 1 foot in diameter, and are restrained so that they do not eject during design basis accident blowdown forces. This restraint is achieved by a u-bolt arrangcmcnt connected to a cross bar on the bottom of thc icc basket.

On January 12, 1998, an ENS call was made by D.C. Cook to rcport damage to ice condenser baskets. Morc detail on thc ice condenser damage was provided in LER

'8-08-01. Today's rcport is related to manufacturing defects rather than damage.

Event Defective and missing welds have b'een found on the icc basket bottom cross bar and bottom basket grids during an inspection of the unit 1 ice condenser. A)though preliminary analyses have indicated that the presence of defective welds on the bottom cross bar may bc acceptable, the aggregate effect of missing and defective welds on both the bottom cross bar and bottom grid structure has been determined to constitute an unanalyzed condition. It is expected that similar conditions will be found in the unit 2 icc condenser ice baskets.

Corrective Action T'e investigation of this c'ondition is ongoing. The defective ice basket bonon1 rims will bc replaced or repaired as appropriate. A written 10 CFR Part 21 update will be submitted within 30 days.

9807i70287 980623 8 PDR ADQCK 050003l5 8 P DR+

TOTAL P.81

POWER; REACTOR EVENT NUMBER: 34427 FACILITY: COOK REGXON: 3 NOTIFICATION DATE: 06/23/98 UNIT: [1] [2] [ ] STATE: MI NOTIFICATION TIME: 10:19 [ET]

RX TYPE: [1] W-4-LP, [2] W-'4-LP EVENT DATE: 06/23/98 EVENT TIME: 08:07[EDT]

NRC NOTIFIED BY: MARK KELLY LAST UPDATE DATE: 07/10/98 HQ OPS OFFICER: FANGIE JONES NOTXFICATIONS EMERGENCY CLASS: NOT APPLICABLE 10 CFR SECTION: MIKE JORDAN RDO ADAS 50. 72 (b) (2) (i) DEG/UNANALYZED COND CCCC 21.21 UNSPECIFIED PARAGRAPH VERN HODGE UNIT SCRAM CODE RZ CRIT INIT PWR INIT RX MODE CURR PWR CURR RX MODE N N 0 COLD SHUTDOWN 0 COLD SHUTDOWN N N 0 COLD SHUTDOWN 0 COLD SHUTDOWN EVENT TEXT ICE CONDENSER BASKETS FOUND IN UNANALYZED CONDITION THE LICENSEE D ISCOVERED DURING AN INSPECT ION OF UNIT ONE ICE CONDENSER ~

MISSING AND OR DEFECTIVE WELDS ON THE BOTTOM CROSSBAR AND BOTTOM BASKET GRIDS OF THE XCE CONDENSER BASKETS. THE LICENSEE EXPECTS TO FIND SXMILAR CONDITIONS IN THE UNIT TWO ICE CONDENSER. THIS CONDITION IS UNANALYZED AND AN INVESTIGATION WILL CONTINUE INTO THE CAUSE OF THESE CONDITIONS. THE CONDITION IS BEING REVIEWED FOR REPORTABILITY UNDER 10CFR PART 21.

THE DEFECTIVE ICE BASKET BOTTOM RIMS WILL BE REPAIRED OR REPLACED AS APPROPRIATE BEFORE ENTERING PLANT STARTUP.

THE LICENSEE INFORMED THE NRC RESIDENT INSPECTOR.

• )+* UPDATE ON 7/10/98 e 1704 BY KELLY TO GOULD ***

THE LICENSEE XS CONSIDERING THIS CONDXTION TO BE A PART 21 REPORT SINCE THEY DETERMINED THE REPORTED ICE CONDENSER DAMAGE'XS MORE OF A MANUFACTURING DEFECT THAN DAMAGE. IT IS EXPECTED THAT SIMILAR CONDITIONS WILL BE FOUND ON UNIT 2.

THE RESIDENT INSPECTOR WAS INFORMED.

THE REG 3 RDO(GARDNER) WAS NOTIFIED.

VERN HODGE(NRR) WAS NOTIFIED.

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