ML17252B479

LER 76-060-00 for Dresden, Units 2 and 3 Re Discovery of Water Leakage in Diesel Generator Room Led to Identification of Small Hole in HPCI Test Return Line Condensate Storage Tank

ML17252B479
Person / Time
Site:	Dresden
Issue date:	10/05/1976
From:	Stephenson B Commonwealth Edison Co
To:	James Keppler NRC/RGN-III
References
BBS LTR 76-707 LER 76-060-00
Download: ML17252B479 (3)

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e CommonwAth Edison Dresden Nucle~ower Station R.R. #1 Morris, Illinois 60450 Telephone 815/942-2920 BBS Ltr. 1176-707 October 5, 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

REFERENCE:

Docket No. 50-237 and Docket No. 50-249 Encl.osed please find Reportab1e Occurrence report number 50-237 /1976-60.

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

teph nson Station Superintendent Dresden Nucl~ar Power Station BBS:jo Enclosure \

cc: Director of Inspection & Enforcement Director of Management Information & Pro~ram Control File/NRC

LICENSEE EVENT HEPORT -* . .

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CONTRO( BLOCK: l '. I . I I* I. 6I . . . .... ~SE PRINT ALL REQUIRED INFORMATION) 1

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• LICENSEE LICENSE EVENT NAME LICENSE NUMBER TYPE TYPE

@El-III'- IDIRISl21 10101--10101010101-1010 I 1411 11 11 It I 10131 7 8 9 14 15 25 26 . 30 31 32 REPORT REPORT CATEGORY TYPE. SOURCE DOCKET NUMBER EVENT DATE REPORT DATE (2EJcoNT I! I I LbJ LhJ IOISIDl~IOl:tl31'71 Io 19 Io 15111 . I . II Io Io I 5 17 I~ I

• ... 7 8 57 58 55! 60 61 68 69 74 75 80 EvENT. DESCRIPTION *

• .* [filfil I J?uR1 l\JG- No~rviAL 0PER.AT1 DN1 THe Discov£rs.y oF WATe-R. L£BKAfr£ 1N nr= I 7 8 9 . . 80 .

• lof31 IUNIT 1'3 D!£$£L G-ENEf<.ATOf2.... a:<ooM t. £D To lff£ IPENTrFtCATtON OF A* I 7 8 9  : . . . 80

. lc>141 lsmALL HOJ..£ . /[\) HPCt TEST Rt.TURN L1AJG'. 2/~ .:..~342..-Ati" AT IH£ "8 co/\/-f 7 8 9 . . . . 80

~ ID£NSATC. STOl<A~£ TANK. SYSTEM. OP>Ef?ABJi-LTy *WA!; N((( AFF£CTSD BE"CAUSE"I 7 8 9 .. . - . 80 lol6I £ J..,//\1£ IS* NDrlf'YIAU- ISDl-ATE'P TH£ HPC/. SY'SlEfYl. EXCEPT WHEN USED 7 8 9 PRME ($ 'ATf/IKJ1.D 511£BT 80 S:v'STEM CAUSE COMPONENT COMPONENT

.CODE . COOE COMPONENT CODE SlJl?PUER MANUFACTURER VIOLATDN

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7 8.9 10* .11* 12. 11* 43 44 47* 48 CAUSE DESCRIPTION

• lol0I I Al som£ 1NPtrreR.m1NATE -nmJ£ ,. THE PtP£ INSUJ..ADDN Wf'l5. ,, PPA R.~NTL y I 7 8 9 80 lolsl .I

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W£ITED, *CAUSING GHLOR.10£S TO LEACH OUT OF" THg. LAG<itNG-. tl-llS EVI - I 80

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.. 7 l*_L)E:NTLV 8 9 .,

A CC..E LE RAT£.'D EXTERNAL CORROSJON OF THE Pl PE ANT> £V£NIUAL..LY I

80 .**

• .. * . .,,,~<<;'f:Ai:li.ITY '* **:METHOD OF

• .*,*STATUS ._, POWER OTHER STATUS .. <;,*01sco-VERY DISCOVERY. DESl::;RIPTION

• .. : EEJ** 1.~J 101715 I /Vil I .~ NA I 7 8. 9. 10 . 12 13 44 45. 46 80

• FORM OF*

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. 10 . 11 t~t(SE I...._*--A-MO_u_NT_M_oF_'AA_C_TIV_IT_Y_ __.I 44 45 I Nit LOCATION OF RELEASE 80 PERSONNEL. EXPOSURES *.

NUMBER . . TYPE DESCRIPTION .

. ~- lo 1010 I * ~. . . .*___JJ. ___

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7 8 9 . *11 12. 13 80 PERS'ONNEL INJURIES

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• Nl.iM'B.ER *:DESCRIPTION .

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OF.FSITE CONSEQUENCES -

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7. '8 9' . 80

. LOSS OR DAMAGE TO FACILITY .

TYPE DESCRIPTION l!E. @] . .

. 7 8 9 . . 10 N'.ti 80 PUBLICITY fil?.l /I/,

.7 8 9 80 ADDITIONAL FACTORS

. 7 ffifil89 80 11

~- N'D_ ~v-r NAME:_"-_n_ _ _ _ _C.

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• EVENT DESCRIPTION (Continued).

for flow testing. The line was subsequently taken out of service. A leak in the Unit-2 HPCI test return line was discovered on 9-15-76. (50-237/1976-60)

CAUSE DESCRIPTION (Continued) resulted in failure of the pipe wall. The affected area, which was less than

!,;" in diameter, was temporarily repaired. To prevent future corrosion, this section of line.will be replaced and fitted with a different type Sf insul-ation as soon as practicable.

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