ML17252A203

Transmittal of Reportable Occurrence No. 50-249/1976-9

ML17252A203
Person / Time
Site:	Dresden
Issue date:	05/27/1976
From:	Stephenson B Commonwealth Edison Co
To:	James Keppler NRC/RGN-III
References
BBS Ltr. #414-76 50-249/1976-9
Download: ML17252A203 (3)

Text

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0 CommonvAlth Edison Dresden Nucll!l'Power Station R.R. #1 Morris, Illinois 60450 Telephone 815/942-2920 BBS Ltr. #414-76 May 27' 1976 Mr. James G. Keppler, Regional Director Directorate of Regulatory Operations - Region III U. S. Nuclear Regulatory Commission 799 Roosevelt Road Glen Ellyn, Illinois 60137 Enclosed please find Reportable Occurre

• mce number 50-249/ 1976-9.

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

BBS:smp Enclosure*

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~: B. Stephenson V ~tation Superintendent*

Dresden Nuclear Powet~Station

• cc:

Director of Inspection & Enforcement Director of Management Information & Program Co.ntrol File/NRC 5804

~....

REP OR-e LICENpEE EVENT CONTROL BLOCK:L I I I I I I 1..__.___._~.__.......__.___,6

[PLEASE PRINT ALL REQUIRED INFORMATION)

LICENSEE NAME LICENSE NUMBER LICENSE TYPE

-@El II I LI Pl R.JS~1=31. 10101-10101010101-10101 k41tltl/1(1 7

8 9 14 CATEGORY

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8 57 58 REPORT TYPE.

LlJ 59 EVENT DESCRIPTION 15 25 26 30 REPORT SOURCE lhJ 60 DOCKET NUMBER 101510t~IOl~l41ql EVENT DATE 101s1** lo 17lt, I 61 68 69 74 EVENT TYPE 10131 31 32 REPORT DATE 10 IS 12-IJt 17 ll> I 75 80 (filg) I J)VgtNG-A StH~VE.1UAl'JC-ltST OIJ 1"HE coRE s-P~AY VALVf:'>>, VA.L..V MD 3-1406--'J.58 IR1PPc:DI 7

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8 9 80 lol41

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8 9 80 lol51 lwER~ Y\\')'EAsu12.ED ou12.11..1G-oei;Rr-mo.!V, Af\\IO m-c ToR.Qv¢: swcrcH.S-E:-r:-1.v<.,,> itJER-4: C..H-cc.Kro. NO -I 7

8 9 80 lfilID (J,~nJ"su7n.... CH"ARACTt--i?.1 Ti

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L'PCI AND IHC R£iNl'Jt>AIJI 7

8 9 PRIME (SE'C: A1'!l'lc. i+D ':)l+tET',

80 SYSTEM CAUSE COMPONENT COMPONENT CODE CODE COMPONENT CODE SUPPLIER MANUFACTURER VIOLATION

@El IS IF I ~ IC I K ITIB IR I Kl lAJ IG IO I g Io I lt{J 7

8 9 10 11 12 17 43 44 47 48 CAUSE DESCRIPTION

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AN IJ\\Jf\\DG::Q\\JAT£ Of<

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8 9 J./i.fO V A (. HOW EEJ 7

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FACILITY STATUS L~J 9

FORM OF ACTIVITY RELEASED lbJ 9

PERSONNEL

% 'P0\\11/ER OTHER STATUS I0.171~ I -..._I __

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10 12 13 44 CONTENT OF RELEASE AMOUNT OF ACTIVITY

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....:....;N_,,;,.A __

10 11 44 EXPOSURES NUMBER TYPE DESCRIPTION METHOD OF DISCOVERY lg_]

45 45 80 I

OISCOYERY DESCRIPTION NA 46 80 LOCATION OF RELEASE Nii 80 DE 1010101 -~ --~_A _________________ __

7 8 9 11 12 13 80 PERS'ONNEL INJURIES NUMBER DESCRIPTION EE 1010101

.__~--'-'IV~~~~~~~~~~~~~~~~~~~~~__,

7. 89 11 12_

80 OFFSITE CONSEQUENCES

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7.

8 9 80 LOSS OR DAMAGE TO FACILITY TYPE DESCRIPTION Efil lbJ 7

8 9 10 80 PUBLICITY E0 Nit 7

8 9 80 ADDITIONAL FACTORS

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NA 7

8 9 80 IT1fil '

7 89~~~~~~~~~~~~.~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~8~0 NAME: £. /,., *. ~

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PHONE: Ex/~.?. ~ S""

GPO 881

• 667

EVENT DESCRi"P.TION (continued) core spray loop would have been available and operable had the valve tripped in the closed position following a LOCA.

Thermal overload tripping occurs on this valve only after multiple actuations.

. Additionally, valve 1402-25B is a nomally closed valve whi'ch opens. for

• system operation.

Although this is the first failure of this type on valve 1402-25B, other similar valves have experienced thermal overload trips at Dresden.

(50-249/1976-9)

CAUSE DESCRIPTION (continued) 480 V AC.system.

With the resultant. increase in current, frequent operation of the valve causes... the overload *heater to trip.

0.

A modific~'tion has *been. initiated to. replace the present* overload heaters of

• this tyP.e with ).arger:. GE model.IJCRl?~K7.. 91A. overload heaters.

Installation of the~'e*~hlgher'-'cap'ii.tity:,; unfts ;~whi~h,. are"pre~en:py *ori '*ai~er) *should prevent future ~thei;tiial.,overload~ failures;- on: siriiilarlj°* eq_uill-e.4 iµotor-6perated valves.

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