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 B Commonwealth Edison Co
To:	Keppler J G Office of Nuclear Reactor Regulation
References
BBS Ltr. #77-773 LER 77-017-00
Download: ML18018B215 (8)

Text

TO: Mr.James Go Keppler FROM: Commonwealth Edison Comp'any Morris, Ill Bo Bo Stephensen NRCbFORM 195 U.S.NUCLEAR REGULATORY C SSION--12.76)--~-NRC DISTRIBUTION FOR PART 50 DOCKET MATERIAL DOCKET NUMBER 95-49 FILE NUMBER INCIDENT REPORT DATE OF DOCUMENT 5/13/77 DATE RECEIVED 6/8/77 PfLETTER EfoRIlIINAL

, OCOP Y DESCRIPTION 0 NO TO R I Z E 0 gkJNCLASSIFIED t PROP a~'a INPUT FORM ENCLOSURE NUMBER OF COPIES RECEIVED I&id QCD I I l~C~QQ'i7aa~~

~I ihgg)gag: j)Q)NUT<~~"" I Dresden Unit No.2 JL (1-P)Licensee Event Report (RO 50-237/1977-17) on 4/13/77 concetning the ba)i isolation valve on"E" Traversing Incore Probe.-'ystem Guide Tub'e failing to open from the control room as required.during a surveillance'2-P)

NOTE: IF PERSONNEL EXPOSURE IS INVOLVED SEND DIRECTLY TO KREGER/J, COLLINS BRANCH CHEEP!W 3 CYS FOR ACTION LICo ASSTo:-W--, CYS ACRS CYS RQE9%88 S FOR ACTION/INFORMATION dEG'RC PDR I&E (2 MIPC.SCHROEDER/IPPOLITO HOUSTON NOVAK/CHECK GRIMES INTERNAL D IST RIBUTION BUTLER HANAUER TEDESCO/MACCARY EISENHUT BAER SHAO VOLLMER/BUNCH KREGER/J COLLINS LPDR./E (TIC~EXTERNAL DISTRIBUTION CONTRO MBER 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 Directorate of Regulatory Operations

-Rag log J I lDOCl(g gila U.S.Nuclear Regulatory Commission igegQ181O>Y 799 Roosevelt Roa'd Glen Ellyn, Illinois 60137 Fj/p'y)4 l e 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.8%, 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, 0 0 cr P a'I v 4 1 P (p 1%K 1 P r J'1 II lf l t/

CONTROL BLOCKLICENSEE EVENT REPORTt.'"'PLEASE PRINT ALL REQUIRED INFORMATION) 6 toa~]7 89 UCENSEE NAME D R S 2 0 14 15 LICENSE NUMBER 0-0 0 0 0 0-0 LICENSE TYPE 0 4 1 1 1 1 25 26 30 EVENT TYPE 31 32 REPORT REPORT CATEGORY TYPE SOURCE[oa~jcowo' 7 8 57 58 59 60 EVENT DESCRIPTION OOCKET NUMBER 0 5 0-0 2 3 7 68 69 61 EVENT OATE 4 1'7 7 74 75 80 REPORT OATS 0 5 1 3 7 7[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.7 89 t00~]The remainin TIP ball valves were exercised satisfactoril 80 er rocedure DOS-,1600-8.

7 8 9 80 I Since the valve failed in the closed position, primary containment was not violated.7'89 toa~]7 8 9 SYSTEM CAUSE COOS COOE COMPONENT CODE gP]~~E V A L E X 7 8 9 10'1 12 17 CAUSE DESCRIPTION FAME COMPONENT SUPPUER N G 0 8 0 VIGIATION (cont)N 80[oaf 7 8 9 Jog 7 8 9 Qg movin arts of the valve and valve 7 89 FACIUTY STATUS POWER OTHER STATUS Q~g[pJ~oo 7 8 9 10 12 13 FORM OF ACTMTY COATENT RELEASEO OF RELEASE AMOUNT OF ACTIVITY Q'5 z z NA 7 8 9 10'1 PERSONNEL EXPOSURES EH Lolo JoJ LzJ 7 89 11 12 13 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 7 89 AOOITIONAL FACTORS Q1g NA 7 89 METHOO OF OISCOVERY 44 45 46 NA OISCOVERY OESCRIPTION 45 NA LOCATION OF RELEASE bod , causin minor interferance,'(cont)80 80 80 80 I HIo 7 89 NAME: Paul J.Kolbck MAY 17 1977.Hxt.265 60 gpa gIIl o 607 4 C h p 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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