Part 21 Report - 1998-501

 
 

ACCESSION #: 9807170287







Reportability Requirement



This is Mark Kelly from American Electric Power, D.C. Cook Units 1 and 2,

calling with an initial NRC notification that event number 34427,

previously reported by D. C. Cook on June 23, 1998, has been determined to

also be reportable under 10 CFR Part 21.



The component supplier (Westinghouse) has been provided a copy of this

report.  A written 10 CFR Part 21 report will be submitted by August 10,

1998.



*** THE FOLLOWING WAS REPORTED ON JUNE 23, 1998 AS EVENT #34427 ***



Background



The ice condenser consists of 24 bays, each of which contain 81 ice baskets

for a total 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 arrangement connected to a Cross bar on

the bottom of the ice basket.



On January 12, 1998, an ENS call was made by D.C. Cook to report damage to

ice condenser baskets.  More detail on the ice condenser damage was

provided in LER 98-08-01.  Today's report is related to manufacturing

defects rather than damage.



Event



Defective and missing welds have been found on the ice basket bottom cross

bar and bottom basket grids during an inspection of the unit I ice

condenser.  Although preliminary analyses have indicated that the presence

of defective welds on the bottom cross bar may be acceptable, The aggregate

effect of missing with 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 ice condenser ice baskets.



Corrective Action



The investigation of this condition is ongoing.  The defective ice basket

bottom rims will be replaced or repaired as appropriate.  A written 10 CFR

Part 21 update will be submitted within 30 days.



POWER REACTOR                           EVENT NUMBER: 34427



FACILITY: COOK           REGION: 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



                                                  NOTIFICATIONS



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     NRR



UNIT SCRAM CODE IRX CRIT INIT PWR INIT RX MODE    CURR PWR  CURR RX MODE

1     N             N         0    COLD SHUTDOWN       0    COLD SHUTDOWN

2     N             N         0    COLD SHUTDOWN       0    COLD SHUTDOWN



                               EVENT TEXT



ICE CONDENSER BASKETS FOUND IN UNANALYZED CONDITION



THE LICENSEE DISCOVERED, DURING AN INSPECTION OF UNIT ONE ICE CONDENSER,

MISSING AND OR DEFECTIVE WELDS ON THE BOTTOM CROSSBAR AND BOTTOM BASKET

GRIDS OF THE ICE CONDENSER BASKETS.  THE LICENSEE EXPECTS TO FIND SIMILAR

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 @ 1704 BY KELLY TO GOULD ***



THE LICENSEE IS CONSIDERING THIS CONDITION TO BE A PART 21 REPORT SINCE

THEY DETERMINED THE REPORTED ICE CONDENSER DAMAGE IS 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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