ML17252B443

LER 76-016-00 for Dresden 2 Regarding a Discovery of a Through-Wall Crack in the 14-Inch HPCI Sensitized Stainless Steel Safe-End

ML17252B443
Person / Time
Site:	Dresden
Issue date:	04/07/1976
From:	Stephenson B B Commonwealth Edison Co
To:	Keppler J G NRC/RGN-III
References
BBS Ltr. #76-290 LER 76-016-00
Download: ML17252B443 (3)

Text

,. Commonwealth Ason Dresden Nuclear R.R. #1 Morris, Illinois 60450 Telephone 815/942-2920 BBS Ltr. #76-290 April 7, 19 76 Mr. James G. Keppler, Regional Director Directorate of Regulatory Operations

-Region III U.S. Nuclear Regulatory Commission 799 Roosevelt Road Glen Illinois 60137 Enclosed please find Reportable Occurrence number 50-237/1976-16.

This report is being submitted to your office in accordance with.the Dresden Nuclear Power Station Technical Specifications, Section 6.6.B. BBS:aw Enclosure cc: Director of Inspection

& Enforcement Director of Manage*ment Information

& Program Control Fiie/NRC REPORT *

• ENSEE EVENT ** CONTROL BLOCK: .... I

__._I ____.I ___.I [PLEASE PRINT ALL REQUIRED INFORMATION]

LICENSEE NAME @EJ IIIJ..l:PI

£1 S.IJ I 7 8 9 14 REPORT CATEGORY TYPE @ill CON'T I I I

• lI..1 7 8 57 5B 5!:) . EVENT DESCRIPTION 1 6 , LICENSE NUMBER LICENSE TYPE 10101-10101010101-10101 14 I 1 I 11 I r I t I 15 25 26 30 REPORT SOURCE LhJ 60 * , DOCKET NUMBER EVENT DATE 1013121417101 61 68 69 74 lol2l I :Dvg1NG-AN OF TH'G UJJIT-J_

PR1rr1ARY 7 8 9 EVENT TYPE 1011 I 31 32 REPORT OATL 10 14-I o 17 IClJ I I 75 80 s YS'I£ fY1 9 A 80 @@) I

-WALL CRACK Dl$CO\ICQ,ED IN THE lLf--,f NCH HPCI S*"N$111ZEDI 7 8 9 . 80 lol41 I SIA I IV l-£S.<; STEEL I 80 7 8 9 I \cJAT9e A!\/D LDCttrcP 01R£cTL.y fff IHf 80-rrorvt or !Hf P1PE. ?./x 7 8 9. > INCH I 80 IQIID f="Rom THE Sfl.F'£-eAJO-TO-P1P*

WEL(>. 1Cf7b-1<0) 7 8 9 SYSTEM . CODE @0 ICIEI 7 8 9 10 CAUSE CODE 11 CAUSE DESCRIPTION COMPONENT CODE IPlt IPIE:IXIXI 12 17 PRIME COMPONENT SUPPLIER lt{J 43 COMPONENT MANUFACTURER IB 1011 15"1 44. 47 VIOLATION lNJ 48 . 80 "11-1£ C..RACKEO S'Ar::*-END WAS C..lJT OUI ANifJJ SENI TD 8ATTELU!

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3/g 1 NCH FRcM IHE' W.J!l5; I 7 8 9 FACILITY METHOD OF ltf-rfk.tfct>

S HCe'T) 80 STATUS % POWER OTHER STATUS DISCOVERY DISCOVERY DESCRIPTION EE] UiJ le>IOIOI NA l.ill 7 8 9 10 12 13 44 45 FORM OF ACTIVITY CONTENT rn RELEASED OF RELEASE AMOUNT OF ACTIVITY l6j _I __ N_A ----'-----'

LOCATION OF RELEASE 7 8 9 10 11 44 45 80 PERSONNEL EXPOSURES NUMBER TYPE DESCRIPTION IT@ 1010101 1£1 Nii 7 8 9 11 12 13 80 PERS'ONNEL INJURIES NUMBER DESCRIPTION

. EE]lololol NA 7 89 11

............

80 OFFSITE CONSEQUENCES NII 7 8 9 80 LOSS OR DAMAGE TO FACILITY TYPE DESCRIPTION

............ 7 8 9 10 80 PUBLICITY

@?] 7 8 9 80 ADDITIONAL FACTORS IT@ NA 7 8 9 80 PHONE: cx-r.

s: GPO 881

• 667 CAUSE DESCRIPTION (continued)

-1/4 in-ch-long -at the O.D: and 2 inches long at the running ferentially.

Two axial cracks between 1/2 inch and 1 inch in length were also found on the I.D. surface, emanating from the safe ... end-to-pipe weld. Analysis of the!?e cracks has not yee been completed.

An update report will be submitted when results become available.

The cracked safe-end was from SA-182 F316 stainless steel and was unclad. The safe-end had been furnace-sensitized during manufacture.

The replacement safe-end will be either SA-182 F316L less steel or SA-105 carbon steel.