ML18018B215

LER 77-017-00 for Dresden Unit 2 Regarding Failure of the Ball Isolation Valve on E Traversing Incore Probe Guide Tube to Open from the Control Room as Required

ML18018B215
Person / Time
Site:	Dresden
Issue date:	05/13/1977
From:	Stephenson B Commonwealth Edison Co
To:	James Keppler Office of Nuclear Reactor Regulation
References
BBS Ltr. #77-773 LER 77-017-00
Download: ML18018B215 (8)

Text

DOCKET NUMBER U.S. NUCLEAR REGULATORY C 95 -49 SSION NRCbFORM 195

- -12.76) -- ~-

FILE NUMBER NRC DISTRIBUTION FOR PART 50 DOCKET MATERIAL INCIDENT REPORT FROM: DATE OF DOCUMENT TO:

Commonwealth Edison Comp'any 5/13/77 Mr. James Go Keppler Morris, Ill DATE RECEIVED 6/8/77 Bo Bo Stephensen PfLETTER 0 NO TO R I Z E 0 PROP INPUT FORM NUMBER OF COPIES RECEIVED EfoRIlIINAL OCOP Y gkJNCLASSIFIED t a ~ 'a I&id QCD DESCRIPTION ENCLOSURE I

Licensee Event Report (RO 50-237/1977-17) on 4/13/77 concetning the ba)i isolation I

valve on "E" Traversing Incore Probe.

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Guide Tub'e failing to open from the 'ystem C~QQ'i7aa~~ ~ control room as required. during a surveillance'2-P)

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I j)Q )NUT Dresden Unit No. 2 (1-P)

JL NOTE: IF PERSONNEL EXPOSURE IS INVOLVED SEND DIRECTLY TO KREGER/J, COLLINS FOR ACTION/INFORMATION BRANCH CHEEP!

W 3 CYS FOR ACTION LICo ASSTo:

W- , CYS ACRS CYS RQE9%88 S INTERNAL D IST RIBUTION dEG 'RC PDR I&E (2 MIPC

. SCHROEDER/IPPOLITO HOUSTON NOVAK/CHECK GRIMES BUTLER HANAUER TEDESCO/MACCARY EISENHUT BAER SHAO VOLLMER/BUNCH KREGER/J COLLINS EXTERNAL DISTRIBUTION CONTRO MBER LPDR.

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771 NRC FORM 196 I2.76)

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Commonw Edison Dresden Nuclear Power Station R.R. g1 Morris, Illinois 60450 Telephone 815/942-2920 BBS Ltr. ¹77-773 Hay 13, 1977 Hr. James G. Keppler, Regional Director Fj/p'y) 4 l Directorate of Regulatory Operations - Rag log J I lDOCl(g gila e U.S. Nuclear Regulatory Commission igegQ181O>Y 799 Roosevelt Roa'd Glen Ellyn, Illinois 60137 Enclosed please find Reportable Occurrence report number 50-237/1977-17.

This report is being submitted to your office in. accordance with the Dresden Nuclear Power Station Technical Specifications, Section 6.6.B.

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B.B. Stephenson /+

Station Superintendent Dresden Nuclear Power Station BBS:bc Enclosure cc: Director of Inspection 8 Enforcement Director of Hanagement Information E Program Control File/NRC 771600003 . i,

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LICENSEE EVENT REPORTt.'"'PLEASE CONTROL BLOCK PRINT ALL REQUIRED INFORMATION) 6 UCENSEE LICENSE EVENT NAME LICENSE NUMBER TYPE TYPE toa~] D R S 2 0 0 0 0 0 0 0 0 0 4 1 1 1 1 7 89 14 15 25 26 30 31 32 REPORT REPORT CATEGORY TYPE SOURCE OOCKET NUMBER EVENT OATE REPORT OATS

[oa~jcowo' 0 5 0 0 2 3 7 4 1' 7 7 0 5 1 3 7 7 7 8 57 58 59 60 61 68 69 74 75 80 EVENT DESCRIPTION

[oO~J raper,~q ~

o probe TT.p 7 8 9 80

[OD3] S stem Guide Tube failed to o en from the Control Room as re uired during a surveillen e.

I 7 89 80 t00~] The remainin TIP ball valves were exercised satisfactoril er rocedure DOS-,1600-8.

7 8 9 80 Since the valve failed in the closed position, primary containment was not violated.

7'89 toa~]

7 8 9 FAME 80 SYSTEM CAUSE COMPONENT 7

gP] ~~'1 8 9 10 COOS COOE E

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COMPONENT CODE A L E X 17 SUPPUER N G 0 8 0 VIGIATION N

(cont)

CAUSE DESCRIPTION

[oaf 7 8 9 80 Jog

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7 8 9 Qg movin arts of the valve and valve bod , causin minor interferance, '(cont) 7 89 METHOO OF 80 FACIUTY STATUS POWER OTHER STATUS OISCOVERY OISCOVERY OESCRIPTION Q~g [pJ oo NA 7 8 9 10 12 13 44 45 46 80 FORM OF ACTMTY COATENT RELEASEO OF RELEASE AMOUNT OF ACTIVITY LOCATION OF RELEASE Q'5 z z NA NA 7 8 9 10 '1 45 PERSONNEL EXPOSURES EH LoloJoJ LzJ 7 89 11 12 13 80 PERS'ONNEL INJURIES 7 89 11 12 OFFSITE CONSEQUENCES

~15 NA .".Ir 7 8 9 LOSS OR OAMAGE TO FACILITY TYPE OESCRIPTION

~Z NA 7 89 10 PUBLICITY

~17 NA I 7 89 HIo AOOITIONAL FACTORS Q1g NA 7 89 7 89 60 NAME: Paul J. Kolbck MAY 17 1977 . Hxt. 265 gpa gIIl o 607

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Event Descri tion (cont) shear valve would have been avilable as a backup to assure Piimary Containment integrihy. The TIP ball valves on both Dresden Units 2 and 3 were replaced wi.th improved valves'-in 1975. This is the first failure of these valves since that modification (50-237/1977-17).

Cause Descri tion (cont)

The valve was inspected and attempts were made to trouble shoot the problem. Xt was tested again but iC continued to operate erratically. The valve was then replaced and the new valve tested satisfactorily. The valve is a 1/4 inch rotating ball, solenoid actuated, designed to seal against a 0-125 psig air-water mixture, manufactured by General Pneumatic Corporation, cat. no. 608 KWJ06 revision 3.

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