ML17192A581

Forwards LER 80-007/03L-0

ML17192A581
Person / Time
Site:	Dresden
Issue date:	03/12/1980
From:	Stephenson B COMMONWEALTH EDISON CO.
To:	James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML17192A582	List: ML17192A581 ML19305B353
References
80-205, NUDOCS 8003190551
Download: ML17192A581 (2)

Text

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Commonweal.di son Dresden Nuclear Po.,;.,er Station R.R. #1 Morris, Illinois 60450 Telephone 815/942-2920 March 12, 1980 BBS LTR 1180-205 James G. Keppler, Regional Director Directorate of Regulatory Operations - Region III U.S. Nuclear Regulatory Commissiqn 799 Roosevelt Road Glen Ellyn, IL 60137 Reportable Occurrence Report #80-7/03L-0,Docket #050-249, is being submitted to your office in accordance with Dresden Nuclear Power .

Station Technical Specification 6.6.B.2.(d), abnormal degradation of systems other than those specified in item B.l.e: above designed to contain radioactive material-resulting from the fission process.

Through discussions with the resident NRC inspectors from your office, an .extension until March 14, 1980~ in submitting this LER was ob-*

tained until equipment was made available in order to complete our investigation of the event.

tep son*

Station Superintendent Dresden Nuclear Power Station BBS/leg .

Enclosure cc: Director of Inspection & Enforcement Director of Management Information & Program Control File/NRG

e RC FORM 366

,.77)

- ...~--~r- .ENSEE EVENT REPORT CONTRoL"ITT:.0-cK~ l~1--'----------'----'--'---:6 I !JQ (PLEASE PRINT OR TYPE ALL REQUIRED INFORMATION!

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l"r I L I D IR Is I 3 101 o I oI - I o I o *1 o IoJo I- Io Io 101 4 11 11 11 I i 101 I I0 9 LICENSEE CODE 14 15 LICEl\:SE NUMBER 25 26 LICENSE TY?E 30 57 CAT 58 ON'T

!CTD _8_

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L.2:'.JG)J o JS 60 61 JO 10 JO DOCKET NUMBER 12 14 19 6S 10J o 1 2 1 o I 9 J 69 EVENT DATE s Jo J@I o I 3 11 I 2 Is 74 75 REPORT DATE Io 10 80

~--EVENT DESCRIPTION Ar:fD PROBABLE CONSEQUENCES@

l)T21 I During local leak rate test of the containment vent line, the measured leakage was J~ ~1 _ ___;;___ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ __ ,

lCIIJ I 1,990 SCFH which is in excess of the Tech Spec. limit for a single containment isolatiory l~ I valve (29. 38 SCFH). Upon investigation A0-3-1601:--23 was found leaking through. No jO}] I leakage was detected at the other boundary :Valves. This event was of minimal safety

[ID I significance because all leakage was contained in the vent line and was into the dry-

[:TI] I well. Similar events: 50-237/76-10,79-017 & 50-249/76-16.

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8 9 80 SYSTEM CAUSE CAUSE COMP. VALVE CODE CODE SUBCODE COMPONENT CODE SUBCODE SUBCODE till 8 Is 9

ID I@ lEJ@ l!J@ Iv I A 10 11 12 13 IL Iv IE 1x 18 18 L!J@

19

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20 SEQUENTIAL OCCURRENCE REF'ORT REVISION

0. LE R/RO CV ENT YEAR REPORT NO. CODE TYPE NO.

~ REPORT NUMBER I 8I0I I 0 I0 I 7 J I/] J0 13 I L!:J ~

21 22 23 24 26 27 28 29 30 31 32 ACTION FUTURE EFFECT SHUTDOWN ~ ATTACHMENT NPRD-4 PRIME COMP. COMPONENT TAKEN ACTION ON PLANT METHOD HOURS SUBMITTED FORM SUB. SUPPL! ER MANUFACTURER l:J@~@

33 34 L:_j@

35 L!J 36 I

37 0

J 0

I0 I I 40

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41

~CB 42

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43 44 P 1* 3 I4 Io 47 I@

CAUSE DESCRIPTION AND CORRECTIVE ACTIONS @

I A0-3-1601-23 was replaced and the vent line retested. The leakage was 8.71 SCFH. AO-11 3-1601-23 is a 18 rubber seated butterfly valve, model No. 2FII. Leakage was due to trIJ I normal expected wear of the .rubber seats. No further correctiv.e. action is deemed --~...:.

necessary.

tm till8 9 80 FACILITY STATUS  % POWER OTHER STATUS METHOD OF DISCOVERY DISCOVERY DESCRIPTION 0A E 8 LliJ@

9 I0 I 0 1Q J 0 l@).._I__,_N'"'--'/A~--~

12 11 44 l&.JCiVl~~-L_o_c_a_l"'-=L~e~a~k~R=a~t~e"--T~e=s"'-""'-t=i~n~g~~~~~~~_,

45 40 80 ACTIVITY CONTENT r:;-;;,,

~ @

E RELED.SED OF RELEASE AMOUNT OF ACTIVITY LOCATION OF RELEASE LU@ W@l__N_/A_ _ _ _ ___. NA 8 9 10 11 44 45 80 PERSONNEL EXPOSURES r:;;:::,.

NUMBER ~TYPE DESCRIPTION I?J 8 I9 I 0 I 0 010~@~_ _ _ _N_1/_A_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ ____,

11 12 13 BO PERSONNEL INJURIES Q DESCRIPTION~

E 0 NUMBER I 0 I 0 l@..___N_/A_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ ______.

8 9 11 12 so cOSS OF OR DD.MAGE TO FACILITY 143\

TYPE DESCRIPTION V E 8

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9 10 N/A 80 PUBLICITY @ 4 NRC USE ONLY

• 1SSUEDa DESCRIPTION 5 "'

~ ~~ N/A 1111111111111~

8 9 10 68 69 80*;;

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