ML18136A347

Ro:On 791207,when Radiation Alarm Setpoint Reached in Discharge Line of Air Ejectors,Trip Valves Diverted Air Into Containment.Caused by Improper Initial Design Concept.Mods to Maintain Valve Closed Initiated

ML18136A347
Person / Time
Site:	Surry
Issue date:	12/10/1979
From:	VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
References
NUDOCS 8001030771
Download: ML18136A347 (1)

Text

--.-.-,-. ;--;----:--

"c*

--.;,v e r-c..,

4'........ __

$. lilt IC\\.EA!ll -~~~"t..&TCR'I ~.H

-~.. ~..,..

Q.71}

LICENSEE EVENT REPORT

-.c Q. _ rt"R c CO~Ci-s~ ! J I 1 J 1 ~0

~NU.wrcann...u.q~*.m~n~1 l O J 1 I iv I ~

s J. P 1 s I l. f@ 0 1 ° J-t O 1 ° J O I O 1 ° 1-I O I O f@ -' I l. J l. I 1 1 1 JeL.L..J ~

7 a ii

. ~

~ W

.1$

U0."411.W.-P 25 a

ua,,u ~

$7 CAT~

CON"i ID I 1 t 1

• = ~I o I s J o I o 10 12 I a I o @ 1 1 2 1 o 11 I

• 71

• 9 (!}I 11* 2 t 1, o I 7 t *9 I(!

iiC SI DCIQ[.ff~

51 lilt

~!)ATE U

• tS.. ~tiAn iO

£\\rE!.T ~~"TICN ;.a;o ~ca.a.au ~i:,.;~ {,a')

Jt O 1 2,

• I During a rec.ent anal.ysis9 a nan-c:m:use~at~ve feature was found* that: :ls conttary s:o a.

i

!{ ~ TI1 t 'iSil c:~~t. 'liihefl. a radi.at:i.ou a.l.arla setpoint: 1.s reached in the cHs.cbarge. Uni'! oi

! ID I.. ] I tbe a:ir eject:.ol:'s of lm:it:s 1 &. 2. tt1p val.ves di..-ve~ -a:1.r ~o the CDni:.afnmeni:.

A CLS Hi I signal w:U1 close the Containment valve$ l:f t:he CLS 1li signal.i.s reset am a nM.a.'tl Lala:n! i.s stm pr~t. £he val.ve v1.ll r@Open vi.t:hcut: c-perat:o-r ac:tion.

1'his is 'Writ.1 ID I !l ID I* J l*o J 7] l c:ODf°U'mad.lm of verba1 1101:ifieation gi.ven U/7/79 at 1625.

ID []J

'7

{o]~J

~ ~ ~

O;IMP_

v.,u.~...,

=:.

a:im 51..a,nc

• ~a::ml!

$"~

$i ~Ii I I J@) L.J@) Ll I I 1 I I 1*

J@) LJ@) LJ@

a m

tl -

t2 13

,a

~.

~

SIEQIJSm.f.L OCCJU*91a flS"UtU

~$a,II fEll'CIIIT"6Q.

CCCIII

~

1-::J

• 1 I I I I/I I I I.

• LJ I:::!

. LJ a

• 4 27 a

s

-=

11

~

• a,. LHl,MLl:1.'bl'T~

~= I JI

a, a

~~

RJ'T"-*.tl!.t!

~-

~

• .. ~-A"f"T~ ~ ~~-

~

TAJqllil At.Tt~

CMft..lMT IIIIE1l'!QO HOUftS -

~

l'Q!it'M:l,;US.

Sl..#t.JUI tUNLW#-1:;TL L--X§LJ@ W@. U@

• J, I IJ LJ@ LJ LJ@. I I t

.Xi

~

4

• 1

,Q Cl

~

r,so:i;JPTION ~

CORJl!ECTIVE ACTICJiliS @)

CTI[ ] 1 Sinc::e th4!. vaJ..ve operar:es as desi~.. 1:he d~epaney :in valve operatlDU li2$ caused t:

[, 1,]

J, I 2 J

1 1 1.11 I 1 i.. I I~ I~ l J

1 an ~C"P't!r ini.tial d.asign c.rn:eept.

A rlet.alled an.a.l.ysis has been iru.'ti.a't'.ed aru:l modii I tious rill he ~de CD mainuin the va1ve cl.osed fa,Uavuig the res.et~ cf :he CLS nj

~

L f 5igna1.

P'-=Ln"'f'

~

ln'*"tui 11o,o,iel Cfl<ISSTA"fl.1:$ \\Of LJ@ I I. I l@I I

~

CIJ r.::i;\\

~

~~\\=1 LJ@:4 9

HI-1%

n 44

...cmntV ~

,,Q\\

~.

. ~

J:U.. &i,,f;i; AfillOI.NT"tll' ~

e, I....

u,c:&Tll* "~

. a I, J 5 J 7

• . LJ e, l-J(E)I I

• u:;

'l"I 41 l ~ 1, J i I lea)

~~ES.*

"IC\\_

6,.

I ii 1(.§ifT'IWiiJMSCR~ON~

-~*ps.:zd.<JJ83a.. ~

W A llffl lu\\

9 11 12 1.3

. ~L ~£5 t:'::\\

~9'

~OM~

' 1

• I I I J@f *

'" * -, '\\' 1 '* '.,... * ;

f 9, " uu.. *-**-

~ j

• ,1 1,2 1,

--*,._.. -: ~ 4.- *_ -;,.

al.;.1 kbA

.#.l I 1 JiJ

~

~

o;r. C&M.&GE TI> l'ADU'TV r.i\\

T\\~

~

\\::::,I LJ@4

• 7

hlnl 7

&---@,,,.Jf f~y,,,,;!,~PW~;:Jx,:j;y;*ct&t;',\\s~Oo1c os~.... *......,,

. J~

l!'l~-n---

5'ci..l-~,,,e;..,,-.,gf,