ML17252A460
| ML17252A460 | |
| Person / Time | |
|---|---|
| Site: | Dresden  (DPR-019, DPR-025) |
| Issue date: | 08/18/1978 |
| From: | Stephenson B Commonwealth Edison Co |
| To: | James Keppler NRC/RGN-III |
| References | |
| LER 03L-0 | |
| Download: ML17252A460 (3) | |
Text
Commonweal.dison.
Dresden Nuclear Power Station R.R. #1 Morris, Illinois 60450 Telephone 815/942-2920 BBS LTR. #78-1183 James G. Keppler, Regional Director August 18, 1978 Directorate of Regulatory Operations - Region III U.S. Nuclear Regulatory Commission 799 Roosevelt Road Glen Ellyn, IL 60137
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'* I Reportable Occurrence Report #78-030/031-0 Docket #050-249 is hereby suomitted to your dffice 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. 1. e. (~tl~§ig~i:fas:f:@ned--io..
contain radioactive material resulting from the fission process.
BBS/deb Enclosure cc: Director of Inspection & Enforcement ep enson St~.tion Superintendent Dresden Nuclear Power Station Director of Management Information & Program Cotttrol
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NRC FORM 366 17-77).
U.S. NUCLEAR REGULATORY COMMl!iSIUN
- Ll:SEE EVENT REPORT CONTROL BLOCK: i__--1.._..J..____JL--_,_ _ _,___,l 0 (PLEASE PRINT OR TYPE ALL REQUIRED INFORMATION) 6
- I o I o I o I o I o I - Io I o 10~11 11 11 I i 101 I I G>
LICENSE NUMBER 25 26 LICENSE TYPE JO 57 CAT 58 CON'T CITTI 7
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- ~~~~~ ~©I o I 5 I o I o I o I 2 I 4 I 9 IGI o I 1 I 2 I 4 I 1 I 8 '(VI o l s I i I sl 1 I sJG) 60 61 DOCKET NUMBER 68 69 EVENT DATE *
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75 REPORT DATE 80 EVENT DESCRIPTION AND PROBABLE CONSEQUENCES@
I During routine operation, a pinhole leak was found in minimum flow line from 3A
[2TIJ reactor feed pump (line 3-3205A-6"),
Leak located at top of pipe approx. 3" down-
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stream of 3X6 reducer in the 6" dia. piping, System operation not degraded.
Leaks IJDIJ have 'Deen found prevfously in same pipe,. See RO 78-05/0JL-O, Docket f,1050-249.
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adverse effects on public health or safety since minimal leakage was contained.
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SYSTEM CODE I cl RI@
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REPORT I 7 I 8 I NUMBER 21 22 CAUSE CAUSE COuE SUB CODE COMPONENT CODE w@ UJ@ I p I I I p I EI x I x I@
11 23 12 13 SEQUENTIAL REPORT NO.
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16 OCCURRENCE CODE I o I 3 I 24 26 27 28 29 COMP.
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19 REl'ORT TYPE Ll-J 30 VALVE SUBCODE LLJ@;
20 31 I
ACTION FUTURE EFFECT SHUTDOWN
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ATIACHMENT NPnD-4 FORM ~UB.
PRIME COMP.
SUPPLIER REVISION NO.
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. COMPONENT MANUFACTURER TAKEN ACTION ON PLANT METHOD HOURS ~ SUBMITTED L!J@L!J@ LU@
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33 34 35 36 3 7 40 41
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CAUSE DESCRIPTION AND CORRECTIVE ACTIONS @
42 43 44 47 jPro5a6le catises are eiosion due to cavitation and flow characteristics, Leak was QJJJ I repaired fiy welding patch over pinhole. Replacement of pressure control valve and
- [I]J] I resizing restricting orifice on each minimum flow line should reduce.
flow and
((IIJ I erosion i*n tfi.e *lines, ITEl 7
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FACILITY STATUS
% POWER OTHER STATUS METHOD OF t:;::;\\
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DISCOVERY DISCOVERY DESCRIPTION (3/
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45 46 80 8
9 10 12 13 ACTIVITY CONTENT t::;;'\\
RELEASED OF RELEASE AMOUNT OF ACTIVITY CCfil UJ @ Lll@.._I --'N=. A~ _____ _..
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10 11 44 LOCATION OF RELE~SE@
NA 45 80 PERSONNEL EXPOSURES r::;:;..,
NW11BER TYPE DESCRIPTION~
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11 12 13 80 PERSONNEL INJURIES
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NUMBER DESCRIPTION6 GI] I 0 I 0 I 0 I@
NA 8
9 11 12 LOSS OF OR DA1\\'lf\\GE TO FACIUTV t;j3\\
TYPE DESCRIPTION
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9 10 BO PUBLICITY
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NRC USF. ONLY ISSUEDQ DESCRIPTION~
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NA I I I I I I I I I I I I I~
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10 NAME OF PREPARER
.T, Jansen GB 69 80*;;;
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ATTACHMENT TO LICENSEE EVENT REPORT 78-030/031-0 COMMONWEALTH EDISON CONPANY (CHE)
DRESDEN UNIT-3 (ILDRS-3)
DOCKET f/050-249 During a routine inspection while the Unit 3 reactor was at 557 MWe and 1783 MWt on July 24, 1978, a pinhole leak was found in the 3A reactor feed pump minimum flow line (3~320SA~6"), The leak was located at the top of the pipe approximately 3 inches downstream of the 3X6 reducer in the 6 inch diameter piping, A pinhole leak had been previously found in this same location and had been repaired by pad welding as reported in R,O, #78~05/03L~O, Docket #050~249. Other failures have also occurred on these lines on both Units 2 and 3, System operation was in no way degraded 6y the small leak,
~o adverse effects on publi0 health or safety resulted as a consequence of this event s{nce any leakage would have entered the turfiine building floor drain system with no resulting release of radioactive material to the public, The cause of the pinhole leak is believed to be erosion due to cav:i1ation and the flow characteristics in the pipe, Inunediate corrective action included welding a patch over the deteriorated section of pipe.
Long term *corrective action will include replacing the pressure control* valve and resizing the restricting orifice on each minimum flow line to decrease the flow through the line.