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

CommonvAlth Edison

'oc' 0 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.

~lY}~

~: B. Stephenson .

V ~tation Superintendent*

Dresden Nuclear Powet~Station BBS:smp Enclosure*

• cc: Director of Inspection & Enforcement Director of Management Information & Program Co.ntrol File/NRC 5804 ~ ....

e LICENpEE EVENT REP OR-

-* CONTROL BLOCK:L I I I I I I 1..__.___._~.__.......__.___,6

[PLEASE PRINT ALL REQUIRED INFORMATION)

LICENSEE LICENSE EVENT NAME LICENSE NUMBER TYPE TYPE

-@El II ILI Pl R.JS~1=31. 10101-10101010101-10101 k41tltl/1(1 10131 7 8 9 . 14 15 25 26 30 31 32 REPORT REPORT CATEGORY TYPE. SOURCE DOCKET NUMBER EVENT DATE REPORT DATE

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• I I LlJ lhJ 101510t~IOl~l41ql 101s1** lo 17lt, I 10 IS 12- IJt 17 ll> I 7 8 57 58 59 60 61 68 69 74 75 80 EVENT DESCRIPTION (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 8 9 . . . . ,-, ~ . . 80 lol31 1'0011~11L. Q\)~~~V--A~ -IT \Jfis-Q'f-;:;;JG-CLPstp J?~i '-f1~E SWi,;;*Tl~t.~HE 1\1E:li;;,;AL-OV~-LDA~_- wee?:-.1mtr1oiAT1:iyl 7 8 9 - ..,_, - - 80 lol41 -rw1c AT~ Tl~G" . ALV~ )'Y)O"n>R, C.l.IR tJT5 7 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 ~ 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

• lo Isl I11~ i::: WI 1-vr: moToR... TR.1 PP<=:D rAs- *p: kE.s u L-r oi=:- AN IJ\Jf\DG::Q\JAT£ Of< UN0'Q.SI ZG[) OV~ HOl"'T'CR. I 7 8 9 80

@El h-4~ E°XISliNG- 0V£BLOJ\0 I 7 8 9 IT@ Vll.1....ve: i'YloToR. 's J./i.fO V A(. HOW 7 8 9 FACILITY METHOD OF STATUS  % 'P0\11/ER OTHER STATUS DISCOVERY OISCOYERY DESCRIPTION EEJ8 L~J I0.171~ I -..._I_ _ /IJA_ ____. lg_] NA 7 9 FORM OF 10 12 13 44 45 46 80 ACTIVITY CONTENT rn.

7 8 RELEASED 9

lbJ OF RELEASE

~

10

.._I _

11 AMOUNT OF ACTIVITY

_ ....:....;N_,,;,.A_ ___,

44 45 Nii LOCATION OF RELEASE 80 PERSONNEL EXPOSURES NUMBER TYPE DESCRIPTION DE 1010101 -~ --~_A_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ ___

7 8 9 11 12 13 80 PERS'ONNEL INJURIES NUMBER DESCRIPTION EE89101010111 7.

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

12_ 80 OFFSITE CONSEQUENCES

~ 'A

7. 8 9 80 LOSS OR DAMAGE TO FACILITY TYPE DESCRIPTION Efil8 9lbJ 7 10 80 PUBLICITY E08 9 7

Nit 80 ADDITIONAL FACTORS

~ NA 7 8 9 80 IT1fil '

7 89~~~~~~~~~~~~.~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~8~0 NAME: £. /,., * . ~t-(1<:.t NG-CR.., 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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