05000237/LER-1979-016, Forwards LER 79-016/01T-0

Forwards LER 79-016/01T-0

ML17173A742
Person / Time
Site:	Dresden
Issue date:	04/06/1979
From:	Stephenson B COMMONWEALTH EDISON CO.
To:	James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML17173A743	List: 05000237/LER-1979-016, Forwards LER 79-016/01T-0
References
79-311, NUDOCS 7904160170
Download: ML17173A742 (3)

LER-1979-016, Forwards LER 79-016/01T-0

Event date:
Report date:
2371979016R00 - NRC Website

text

• '

CommoAalth Edison Dresden Nuclear Power Station R.R. #1 Morris, Illinois 60'\\50 Telephone 815/942-2920 BBS Lt;r. /179-311 April 6,.1979 James G. Keppler, Regional Director Directdrate of Regulatory Operations - Region III U.S. Nuclear Regulatory Commission 799 Roosevelt Road Glen-Ellyn, IL 60137

• Reportable Occurrence Report #79-16/0lT-0, Docket # 050-237 is hereby submitted to your office in accordance with Dresden Nuclear Power Station Technical Specification 6.6.B.1.(C),

abnormal degradation discovered in fuel cladding, reactor coolant pressure boundary, or.primary containment.

BBS/kmh Enclosure en Station Superintendent

_Dresden Nuclear Power Station CC:

Director of Inspection & Enforcement Director of Management Information & Program Control File/NRC REGUU\\10RY DOCl\\ET FIL£ COPY, 7904160 \\/O

ATTACHMENT TO LICENSEE EVENT REPORT 79-016/0lT-0.

COMMONWEALTH EDISON COHPANY (CWE)

DRESDEN UNIT 2 * (ILDRS-2)

DOCKET II 050-237 During the current refueling outage, workers discovered water dripping from an elbow on a drain line from the bottom of LPCI testable check valve 2-1501-25.

All leakage was contained inside the drywell and directed to the Drywell Floor Drain System.

Upon further investigation the leakage was determined to be coming from a crack in.the weld on the elbow.

The weld was cracked 360° around the pipe..

,.... _._ *~*:*:. :;:

Calculations showed that a complete severance of a l" line such as this*

would be well within the capabilities of ECCS systems.

The defective weld was ground out, repaired and dy.e. penetrant tested following approved procedures; The weld failure was apparently* due to an improper pipe fitup prior to welding* the. pipe originally i.e., pipe bottomed out in the socket..

'l 9 0416 0 \\"71**

• }

-: :,.t

.. ~.....

.:~r-1:.::_-._.;,;.: *~*~: *

,:**-*~.-,*** **

-****r..

0

• ,*:~.~.**~

• -~*:*:**:.-:*:**_

.... ~=::,.*,

.::~~*.*,,,:'~.-.:;

_-~'. :* :::~;~;;~~~"f-~~.;;;~;.~~=::::~;*:*.<'.: ~-*.. :~;~~::;,t~-~!* ~;~~ :;~~:~:_;.~_-;_ ::: ~:*.. :--;~:.;_~ ;;_ 2.-~: ~j~ ~- :.:: * ~~;~~~;:,; *:: ;!.;~ ~.';~;;~::<~:;*;;;;.:~r.;::--:::~:::::;~~.~~~{~;;;;;:r::-~;~~~;:~~;~~

17-77)

J LICENSEE EVENT.REPORT

• l J l j

C'.JNTROL BLOCK:._I _ _.___.. _ _.__..___._ _ _,IQ (PLEASE PRINT OH TYPE ALL REQUIRED INFORMATION) 1 6

] 0:2] I rl LI Dj RI sl 2 IG)I o I 6 I - I o Io Io Io Io I - Io Io 101 41 ll ll ll ll(j)I I 10

~

7 8

9 LICENSEE CODE 14

\\5 LICENSE NUMBER 25.

26 LICENSE TYPE

JO 57 CAT 58 i-------

-~-CON'T

• ~ [£El 7

8 l

i ITTIJ 1

I

~~~~ ~01 o 1 s 10 10 p I 2 I 3 I 7 101 o I 3 I 2 I 6 I 7 I 9 I© I o I 4 I o I 6 I

• 7 I 9 I G) 60 61 DOCKET NUMBER 68 69 EVENT DATE

• 74 75 REPORT DATE BO EVENT DESCRIPTION AND PROBABLE CONSEQUENCES@

!During refueling, water was discovered to be dripp.ing from an elbow in the drain line 1 [2JI] ion a LPCI check valve.

This event was of minimal safety significance because all leak-J J j CQ:0 !age was contained in the Drywell Floor Drain System and the potential leakage, con-i []J:IJ 1sidering a complete severance of the l" line is well within the capabilities of the

• l (]ID IECCS systems.

• l [ill]

Previous occurrence reported as R.O. #50-237/1977-10

~+- LillJ.. r*.

7 8 9

~-.,.. __,. -.~ *:..**... **-

.~--....

~...:.-*.. I.~'""'~;,~.

80 SYSTEM CODE le IE I@

9 10

(;:;\\

LEA/RO LVENTYEAR

~

REPORT I 7 I 9 I

. NUMBER 21 22

CAUSE

CAUSE

. CODE SUBCODE COMPONENT CODE lLJ@ w@ IP Ir IP IE Ix Ix I@

11 12

• 13 18 SEQUENTIAL*

OCCUR REN CE REPORT NO.

CODE I I Io 11 I 6 I

• I......-1 I o I 1 I 23.

24 26.

. 2 7 2B 29 COMP.

SUB CODE lAJ@

19 REPORT TYPE LU 30 VALVE SUBCODE w@

20 L=J 31

• PRIME C.OMP.

RE;VISION NO. w 32 COMPONENT

.ACTION FUTURE EFFECT SHUTDOWN

• (.:;::;\\

ATTACHMENT.

NPRD-4 TAKEN ACTION ON PLANT

'METHOD HOURS ~ SUBMITTED

• FORM 5UB.

W@W@ w@.W lo lo lo lo I. lx.J@ ULJ SUPP LI ER

• w MANUFACTURE.A 33 34 35 36 37 40 41 42 Ix I 9 I 9 I 9 I@

CAUSE DESCRIPTION AND CORRECTIVE ACTIONS @

43

~

47 IJI9:J.!Cause of leak was failure of weld due to improper pipe fitup prior to welding, i*. e.

1.

IT:.IIJ jpipe was apparently bottomed out in socket.

Defective weld was ground out, repaired IJ))] 1and dye-penetrant tested in accordance with approved procedures.

• i.* ITITJ [III] I--~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~--'

J 7

8 F!c1uTY l

STATUS

% POWER OTHER STATUS I [QI] L!!J@ I -0 I 0 I 0 l@...... I _N/_A ___

B 9

10 12 11 ACTIVITY CONTENT

~

j '

RELEASED OF RELEASE AMOUNT OF ACTIVITY i ~LU@ W@I

• N/A 7

8 9

10 11 80 METHOD OF DISCOVERY DISCOVERY DESCRIPTION

~@I Operator Observation 44 45 46 80

• LOCATION OF RELEASE @

N/A 44 45 80 P.ERSONNEL EXPOSURES r:;;:;,.

NUMBER

~TYPE

DESCRIPTION

~

I ol o I olL.Ll@.___ __

--"-'-'N""'"A,,__ ___________________

7

• B 9

11

12.

13 PERSONNEL INJURIES

(.;";\\.

NUMBER DESCRIPTION~

~lo lo lo IQ NA*

7

. 8 9

ll~~l2------=~~---------------------------------B-'0 LOSS OF OR DAMAGE TO FACILITY G TYPE*

' DESCRIPTION

~

~@

N/A 80

~

9 10 PUBLICITY

{.;:..

7

. B BO NRC USE ONLY IS~VEDr,;:\\ DESCRIPTION IT@~~.

N/A

. 7

. 8 9

10 NAME OF PREPARER __

J.;;...;;.,. _;::,F..:.*__::Dc.::u.:.:n.:.:b::..:a:;.;r=-------------

I I I I I I I I I I I I 1

• ~.

68 69 80* o:*.

PHON E: _ __..X.._-...,2...,6....,5..__ ______ _

0. :*

0.