ML17252A251

Transmittal of Reportable Occurrence Report No. 50-249/1976-30

ML17252A251
Person / Time
Site:	Dresden
Issue date:	11/22/1976
From:	Stephenson B Commonwealth Edison Co
To:	James Keppler NRC/RGN-III
References
BBS Ltr. #76-815 50-249/1976-30
Download: ML17252A251 (3)

Text

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Commonwe4 Edison Dresden Nuclear Power Station R.R. #1 Morris, Illinois 60450 Telephone 815/942-2920 BBS Ltr. #76-815

~gulatory Docket File November 22, 1976 Mr. James G. Keppler, Regional Dlrector Djrectorate of Regulatory Operations - Region 111 U. S. Nuclear Regulatory Commission 799 Roosev~lt Road Glen Ellyn, 11 l inois 60137 Enclosed please find Reportable OccurreMce report number 50-249/1976-30.

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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. Ste enson Station Superintendent

.Dresden Nuclear P6wer Siatfon BBS :jo Enclosure cc:

Director of Inspection & Enforcement Directcir of Management Information & Program C6ntrol Fi 1 e/NRC 12111

• LICENSEE EVENT REPORT e CONTROL BLO~K: I I~ I I I I

[PLEASE PRINT ALL REQUIRED INFORMATION) 1 6

LICENSEE NAME LICENSE NUMBER LICENSE TYPE EVENT TYPE

--~~II IL ID IRIS 13 I 10101-IOIOIOI 010!-IOIQJ l-41 I I I I I I I I 10131 7

8 9 14

. 15 25 26 30 31 32 REPORT REFORT CATEGORY TYPE.

SOURCE DOCKET NUMBER EVENT OA TE REPORT DATE

• @E]_coN'T I I I l!J L6J IOl5IOl~lbl21~191 II IOl~l~l7lbl l/lflf IWl7101

7. 8 57 58 59 60 61 68

. 69 74 75 BU EVENT DESCRIPTION

[Qlli) I DVRJAJG--

REFUE/..JN<;. OVTl-IG-£ }..J)C:ff L /...Elll<-RAT£ 7-Gst/)JG-., THE. Tl P PURGE

. J 7

8 9 80

@El I CHECK VALVE EXHIBITED A LEAK.AG-£ 'RATE OE I ~g-SCFH (T£CH SP£C Ltm1T: 19.3~11 7

8 9 80 lol41 I SC£H). TH£ VALY£ WBS REMOVE:D FRom "TH£ SYsTE.M AND CLEANED WITH I

7 8 9 80

~: lcomPR£SSE]) litR.. FOLLDWJNG-R£1NSTAJ..J.,,flTJON OE rkt=. VA.l..VE, TESTING: YIELDED l

' 7 8 9 80

.{filfil WELL E:

l.J I ERfrt1SS1 f:.

LlfYJ T THIS 15 TE FtRS 1

0 9 PHJMe (SEE ltTTflCH£.1) SNcE.T 00 SYSTEM CAUSE COMPONENT.

COMPONENT CODE

. CODE COMPONENT CODE SUPPLIER MANUFACTURER VIOLATION

~ I I IF I l&J Iv I A IL Iv I£ Ix I lfil IX 1 't I q I'! I LYJ 7

8 9 10 11 12

. 17 43 44 47 48 CAUSE DESCRIPTION (oj0j I TH£ VALY£ l..EAkAGE WAS APPARENTJ..Y CAUS£D BY PIRT ON TIIE BALl OB.. Ti-uzJ.

7 8 9 80 lo191 lscAl/NG-- ABEA. AS 5TATEJ) ABOVE, THE VALV£ wes CLEANED WITH CQfYIPRs.<"££D I

7

.8 9 80

~ I AIR} w /TH SATISFACTORY. RE5:.Ul-T5.. PUF?ING-R£f\\GTOR OPERATION, THE TI p

. ' I 7. 8 9 FACILITY METHOD o~

(SE.£ l!TTAGHED <;;ffE"ET) eo.

STATUS

'lli POWER OTHER STATUS DISCOVERY DISCOVERY DESCRIPTION fil]

WJ IO IO lo I I NA lliJ

_I ___ --'-M-~_-.* _______ J 7

8 9

10 12 13

. 44 45.

46 80

.FORM OF ACTIVITY *.

CONTENT RELEASED OF RELEASE AMOUNT OF ACTIVITY rn

-lb.I LbJ

..... I _ __;M_l'l ___

7 8

9 10 11 44 45

. LOCATION OF* RELEASE AJA j

'------<...:....---..,----------80 PERSONNEL EXPOSURES NUMBER TYPE DESCRIPTION (fill Io Io Io I lZJ

.;.::.M:..:...:~--_..;..,;----------------~----~

1 0* 9

• 11 12 13 80 PERS"ONNEL INJURIES NUMBER DESCRIPTION VE 1010101 Nit 7.. 8.9 11 12 80 O.FFSITE CONSEQUENCES

.[ill]

ft 7

8 9

. BO LOSS OR DAMAGE TO FACILITY TYPE DESCRIPTION E@.lb.J M

7 8 9

. 10 80 PUBLICITY

(£0 7

B 9 80 ADDITIONAL FACTORS

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7 8 9 80

[iliJ 7

89 BC NAME:

£[)WARD.l. [;ECK!NG"£"R PHONE: £ XT, d..(, 5

/

EVENT DESCRIPTION (Continued) time this valve has been local leak-rate tested since unit operations began.

(50-249/1976-30)

CAUSE DESCRIPTION (Continued) purge line is 'connected to the nitrogen makeup system, which is maintained at approximately 100 PSIG.

Consequently, it is considered extremely improbable that any through-leakage would otcur, even with drywell pressure at the design limit of 48 PSIG.

The safety significance of this event is further minim1zed by the physical size of the*purge 1 ine (1/4 - inch).

To ensure the timely identification of a recurring problem, surveillance testing of the Tl.P* purge

~heck valves has been added to the refueling outage LLRT procedures for both Units 2 and 3.

The valve is a 1/4 - inch ball check valve, model C400-10S,

• manufactured by Manetrol.

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