ML19269E563

LER 77-056/03X-2 on 771118:during Routine Operation,Aerated Waste Evaporator Concentrates Tank Was Pressurized W/Air & Ruptured.Caused by Application of 100 Psi Air to Tank W/Blockage in Tee in Unvalved Vent Line.No Repair Planned

ML19269E563
Person / Time
Site:	Millstone
Issue date:	06/15/1979
From:	NORTHEAST UTILITIES
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19269E556	List: ML19269E555 ML19269E563
References
LER-77-056-03X, LER-77-56-3X, NUDOCS 7906290290
Download: ML19269E563 (2)

Text

u. ... , ( c ., , . . .,.,,,,,,,,,,

t inc: onu :e,c.

1.'ill

" .I 1.lCENSEE EVENT REPORT i

' coNutOL clock: [_j_j_j_j_{J0 @ p.t.E ASE l'HIN T O!t T YI'E AL.L HEOUiHLO INF Ont,tm(ON) -I 1

~

1. .. . .

?G tIcttGt. 1Yrt:___J')

tal. _ . .C A I t,d

_ . . . _ . . _ LICt tGL tiU\thi 14 '/ 5

. 1 t*

G U t f((NSE L COOL. . . . . - .14 CON *l IEl  ;%2's i Ll@lLLLID Ja.Jo_b..l:tJo_13l.LLLLLift.1112..l@loJ.c_hA1Ll9.J@ 63 to i Vtul DATI 74 7 '.* HL POill DAll t0 I; 00 Of DOCr,t I r.Umit a 7

I.V1 f!T D! SCHil'llON AND PHORADLI: CONSEOllEf!CE S h _j l'o 13] L_.noring routine plant oteration,_the Aerats;d 1! asth _13enntor Concentratg_ tan't A rupture of approximately five feet by l pi]3] L was presstirized with air at 100 PSI.

The contents of the tank were contained within j El L_ six feet occurred in the tank.

j p,Ti-] I the radwaste system. .

b

[TUl 1 1

IHB L_

J34 FM]L_

7 it 9 CO:. P. VAtVE SYSil r<1 CAUSE CAUSr SUCCODE SUt: Coat Lobi SUNCODi CO'.9POh'i.N1 COD!-

CODI

[0IIJ8 latLvj@ lAJ@ laJ@ 1.ddEA.lc.JuJ8 f3 la LEJ@ LzJ @

1 :+ 'M 9 10 11 1/

f(LFOir! IM VISION 7

SE QUI tJ II Al. OCCtIDhl NCf CODE 1YPs fJO.

iti f'OiD t;O.

_i Vf ra YE / et

@ ,"t'4Z1 i H/HO I,n,' h J 1ml >,oL hLcJ 121 n

InJ2J u n 12J n

l=,

3 1 LaJ n

n n n IC . t 3. l t il l I. ii / t ItfitLH Odi /t'T t'l I I i llOURS 5t Lt i 1 I t! A 11 Iz.J@ Loj.oj.A.Loj llj@ lJ.LlO LA_J@ ILL9_AJ1.1 11JSLEJ@

33 31 ILJ@

35 35 3/ /.9 41 <? 43 /,4 J@l operator observation J 101)ILJ@ Llj.a.loJ @l HA At IIVi1Y CO ILtJT LOCAllO*c or Rt Lt1s0 AMOUNT Of / CllViTV i Itil I A'.! D Ofit!ttASr na J I rn I W 0it.1 7 0

@ 12J 10

@l3t 44 45 00 l'IIt' ONNE L, t xPO".Unts U

i UMitt n lypg n^ --J ti I'l 1RJo I ol@l z l@ot$cgggp1gog l "

" " rotsOnn a',.uU,rns '

o oo o o a $

nouhot on.anr nOn@nA em eJ A = j w

l,.usilojoioj@i,,

e o ,,

2146 063 V'l1"' i',li,'ti;T,Fl,S" ^'""" @ 790629029o l E, E,l; l,,xj@L,t, .nA gg(., (g3g gNg y Mt IC6 t Y ,"

I'.9'10 tJEf,f:stis g On - -

2

J e ATTACHMEllT LER 77-56/3X-2 Millstone Unit 2 Docket No. 50-336

f. vent _ Description During routine plant operation the Aerated Maste Evaporator concentrates tank was pressurized with air at 100 PSI. A rupture of approximately five feet by six feet occurred in the tank. The contents of the tank were contained within the radwaste system.

Cause Description The cause of the rupture.was the application of air at 100 PSI to the aerated wastes evaporator concentrates tank and the failure of the tank vent due to a blochage in a tee in the unvalved vent line. The concentrates tank was designed for 15 PSI. The air was being applied to clear a line in order to effect a weld repair. Subsequently, 'a study of the aerated waste system has been con-ducted and reported to the !!.R.C. via W. G. Counsil letter of May 21, 1979. The study concluded that it is unnecessary to repair or replace the aerated waste evaporator. Therefore, it is not necessary to repair or replace the tank.

JF0/RS:mw D D *D 3' OWJu O , .. J 2146 064