ML17252B515

LER 78-035/01T-0 for Dresden, Unit 2 Re During pre-installation Corrosion Inspection of Recently Purchased Spent Fuel Storage Racks, Cracks Through Weld Metal in Aluminum Channel to Base Plate Fillet Welds Were Found in 8 of 18 Racks

ML17252B515
Person / Time
Site:	Dresden
Issue date:	06/09/1978
From:	Stephenson B Commonwealth Edison Co
To:	James Keppler NRC/RGN-III
References
BBS LTR 932 LER 78-035/01T-0
Download: ML17252B515 (3)

Text

e Commonw.h Edison Dresden Nucle ower Station R.R. #1

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James G. Keppler, Regional Director Directorate of Regulatory Operations - Region III U.S. Nuclear Regulatory Com_mission 799 Roosevelt Road Glen Ellyn, IL 60137 Reportable Occurrence Report #78-035/0lT-O, Docket #050-237 is hereby submitted to your office in accordance with.Dresden Nuclear Power Station Technical Specification 6.6~B.l.(i), performance of structures, systems, or components that requires remedial action or corrective measures to prevent operation in a manner less conservative than assumed in the accident analyses in the safety analysis report or technical specifications bases: or discovery during plant life of conditions not specifically considered in the safety analysis report or technical specifications that require remedial action or corrective measures to prevent the existence or development of an unsafe condition, tep son Station Superintendent Dresden Nuclear Power Station BBS/deb Enclosure cc: Director of Inspection & Enforcement Director of Management Information & Program Control File/NRC

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NRC FORM 366 U.S. NUCLEAR REGULATORY COMMISSION 17-77)

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eI I LICENSEE EVENT REPORT Ir,'\ e (PLEASE PRINT OR TYPE ALL REQUIRED INFORMATIONI

~ 1*r I LI DI RI s I 2101 0 I 0 I - I 0 I 0 I 0 I 0 I 0 I~ I 0 I 0 IG)l 4 11 11 11 I 1 101 I 10 7 B 9 LICENSEE COD.E 14 15 LICENSE NUMBER 25 26 LICENSE TYPE :JO 57 CAT 5B CON'T

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.7 B 60 61 DOCKET NUMBER. 68 69 EVENT DATE i"- 75 REPORT DATE BO EVENT DESCRIPTION AND PROBABLE CONSEQUENCES@

I . During pre-installation corrosion inspection of recently purchased spent fuel storage!

[ill] racks, cracks through weld metal in aluminum channel to base plate fillet welds were I

-~ found in 8 of !B racks. Eight other racks from same shipment were previously installfad

[TI[] before last ILDRS-3 refueling outage. The *s installed racks were not specifically

~ inspected for cracks but did pass similar pre-instaliatiOn inspection that found thesr

[£]2] I cracks. Minimal safety significance evident since fuel was not stored in any racks . I

[Ill I known to have weld cracks. This event _is not repetitive.

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l.QJ 21 22 23 24 26 27 28 29 JO 31 32 ACTION FUTURE EFFECT. SHUTDOWN (.;::;\ ATTACHMENT NPR0-4 PRIME.COMP. COMPONENT TAKEr~ ACTION ON PLANT METHOD HOURS ~ SUBMITTED FORM :::.UB. SUPPLIER MANUFACTURER

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36 I o I o I o I o I W@ IJLJ(§ ll!J@ I cl o Is lo I 37 40 41 42 43 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS @

I Cause unknown. - all fuel removed from 8 installed racks in ILDRS-3. An investigation; is being conducted by G.E. to determine the cause of the weld cracks, formulate a repair program for the welds and an inspection program for the 8 installed racks and IITIJ

.[JJJ] I remaining welds on the 18 racks not installed. - Results of this investigation. will

~ I be submitted in a supplemental report upon receipt.

7 B 9 80 FACILITY METHOD OF A STATUS  % POWER OTHER STATUS DISCOVERY DISCOVERY DESCRIPTION ~

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B 9 10 12 n 44 45 46 80 ACTIVITY CONTENT . t::;\

RELEASED OF RELEASE . AMOUNT O.F ACTIVITY\~.V LOCATION OF RELEASE@

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PERSONNEL INJURIES . Q NUMBER OESCRIPTION~

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ATTACHMENT TO LICENSEE EVENT REPORT 78-035/0lT-0 COMMONWEALTH EDISON COMPANY (CWE)

DRESDEN UNIT-2 (ILDRS-2)

DOCKET 11050-237 During a G.E. pre-installation corrosion inspection of the spent fuel storage racks cracks, l" to l~" long through the weld metal in the aluminum*

chan:iel to base plate fillet welds, were found in 8 out of 18 racks. During D-3 outage~ 8 other racks have been installed that came from the same.

shipment as the above 18*racks mentioned. These 8 racks were not inspected by G.E. _specifically for cracks in welds but did *pass same type of inspection tha~ found cracks in 8 out of 18 pre-installed storage racks. The cracks found in the pre-installed racks pose no safety question at this time

• since there has been no fuel placed in the racks. This is the first time -:.racks have been found in any of the welds and thus should not be a repetitive occurrence .

. Upon finding*that 8 out of 18 pre-installed spent fuel storage racks had cracks in the welds, all f,uel was removed from the 8 racks now installed in the D-'-3 spent fuel pool 'therefore eliminating any chance of an accident with spent ~uel. An int.ensive study program is being performed by G.E.

on the cause of the cracks, repair program for the welds, inspection required for 8 racks currently installed in D-3 spent fuel pool and inspection for remaining.welds on the 18 racks not installed. A supplemental repo+t will be submitted detailing the results of the investigations by G.E.