ML19330B240

Forwards Response to Items 2 (Unit 3),4,5,6(c) & 7 of IE Bulletin 80-17.Present Standby Liquid Control Sys Design Is Unable to Support two-pump Flow But Sys Is Equipped W/ Interlocking Contacts.Item 2 for Units 1 & 2 Will Be Sent

ML19330B240
Person / Time
Site:	Browns Ferry
Issue date:	07/16/1980
From:	Mills L TENNESSEE VALLEY AUTHORITY
To:	James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
References
IEB-80-17, NUDOCS 8007310208
Download: ML19330B240 (10)

Text

'

Dv f-TENNESSEE VALLEY AUTHORiiY CHATTAttogy,Tf tyNESSEE 374o1 400 Ch'e5'tn't/c S'tre'et %wer II I

l U

23 d!][ l7JuP )p,g80

'W f

Mr. James P. O'Reilly, Director Office of Inspection and Enforcement U.S. Nuclear Regulatory Commission Region II - Suite 3100 101 Marietta Street Atlanta, Georgia 30303

Dear Mr. O'Reilly:

OFFICE OF INSPECTION AND ENFORCD!ENT BULLETIN 80 RII:JPO 50-259, -260, -296 - BROWNS FERRY NUCLEAR PLANT Enclosed is our response to item 2 (unit 3 only), 4, 5, 6(c), and.

7 of the subject bulletin. A response for item 2 for units 1 and 2 will be provided upon completion of the required testing.

Very truly yours, TENNESSEE VALLEY AUTHORITY

~

L. M. Mills, Manager Nuclear Regulation and Safety subscr'1bedapdsworntodefo,#V re me this _ //f7b day ofS X )

1980.

0 0

nkmciffhl, ls<a t uv Notap Public 0

My Commission Expires gi///[/f[cZ-

/

Enclosure cc: Office of Inspection and Enforcement (Enclosure)

U.S. Nuclear Regulatory Commission Division of Reactor Operations Inspection Washington, DC 20555 An Equal Opportunity Employer 8007310 M

- g.

-s.

ENCLOSURE BROWS FERRY NUCLEAR PLANT UNIT 3 e

Item 2 - Browns Ferry Unit 3 Each specific requirement of action item 2 of the Bulletin will be discussed separately.

Results will be discussed and evaluated with respeca to anticipated response. The manual scram was initiated via the manual scram buttons.

The automatic scram was initiated by intentionally making one APRM inoperable in each trip system. Appendix 1 of this report is a summary of the data collected during and after both the manual and auto-matic scrams required by the Bulletin. Appendix 2 is a summary of data collected via special tests prior to receipt of the Bulletin. Appendix 3 is a collection of data from scrams that occurred before June 28, 1980, on unit 3.

Item 2a - Obtain all rod insert times and as many individual rod scram times as practical.

The time from scram to all rods in was measured by an observer using a stop vatch for each scram.

The watch was started upon loss of amber scram solenoid indicating lights and stopped when,

'after* scanning the core display on panel 9-5, the observer was satisfied that all rod motion had stopped.

The times are necessarily very conservative due to the observer scan time required.

For each scram, the observer verified times were very similar.

In each case, the recorded time was faster than the technical specifi-cation scram time limit of 7 seconds for 90 percent insertion of any individual rod.

Scram timing of the A sequence rods which failed to insert on June 28 identified rod 18-55 as the slowest rod.

This rod was observed during the manual scram and was verified to be fully inserted within 4 seconds via stopwatch.

For the automatic scram, the slowest B sequence rod, 22-39, was similarly identified and timed.

Full insertion was recorded in 3.3 seconds.

The scram time data used to select 18-55 and 22-39 as the slowest rods indicated scram times of 2.9 and 2.8 seconds respectively. Based on this data, it is concluded that all technical specification requirements for control rod insertion times were met.

Item 2b - Obtain voltage at the scram rilenoid valve buses to verify that these solenoids are deenergized upon receipt of scram signal.

l Proper scram solenoid valve bus operation was verified by monitoring each of the eight rod scram group buses independently. Test data showed that the buses all fully deenergized at the time of scram l

and deenergized. upon scram reset.

e

w.

w.-

.:.&\\

afi4;'M s.E d,N;p,WSh'r* 6lM.O N dl $ h ht'!U $

1: :.L:: :: -. gg,,g.c e.yge.sg:p.mgby,g.s:rn,q.%y..t&R,)gq5,fg3

.y x,.

[ ; '

Item 2c - Verify,. Lhat.ccram valve.alr Js..re.11cved through WJ.J ~.k the backup valves and that the backup v.il..fes ar Jc open and remisin.open during the tresente of a s.e.. fully e-t....

't' i

cram sLgnal. %.D.*1 J.D Z,.).,L.&....

~

s y.&.4Wf...m... 4. %.n,.

ikdn W W

Operat ion of bot. h backup t s. cram' v.alves ~'was~ v

..A.;

. 3. u. a... !. _.

• f t e s t ed a t ' th@Ee4f'ic rdE? 9**Y*'#~~"".valv.ingN

<M ;;;,.

paper flags t...observ..m'the r.. lease,o.f',a..ir fro.

.h..

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u o

e e

m eac e

f M

1. ~.

N j '; p... '.3.... p, 4.. :@ v..

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t i.g,J..vvel.

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..n.

po in ts.y.y,-

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( The f111 L'ime,s..om%...,e,

.o: e.a.,l.m..rm.'u,i,,r,o,d..

... +rpa.o l o e..

i+.u.

n. <..n %J.a d scram.

g,,,.WMw.g0.e s.

.s

%v.

n...u

~ vs '

-. A.

. +.

r.

n v m..r. ~. n. - w..v.

s

/:;.., <rg

,,on,the SDVT f rom scrani tq swltch actuation jja.3

. c-- c..M

. i.

u d$

N:: as obtained b.y t..wo me..t.h.o.d. s e...T..h.e3.GPt.! W. itch.was.obtained~.h.=.m. 2: e

. w u

lq,.. ;;;f.f..,k.Q

~.

.a

• '""' ' Y " Y " ?

U k W '.**IL*b*5$

kk

.... we re obt ain. e'3 ' $~*.W." ;a' C?!.*$-$.V WY"a frnm. the lar

[i $ $ D $ M, m,nd sequentiM k N*b. h ? k.

p;g,....m.

m.n,mq m m a cor Mh y"m-;.3.s.

w...

2n hk.I.[h.9 MM*A'NN

'N

- u.g

The d i f fe ren e..._

- w =l.ve r sm.= ~.m =I.s.'~3 ue&. *w--~

c

.m

--m

v.. t c*in fil2-to the'.lengtb..u.. im._. time. nanua.

-a u toma t i..c,,~

w

+

F,y.

46.fr,64P.M. r,." man'ual s cram wa+s J...e 'in.13 a. nt sign al wa s~. pr,e.,s en v eath... a oryt

..e,4*sc.r

.a

1. . M""**

c...,3.

. m.

.i M-w s. topped....se..conds e.and.f. rom...th.i.s.4 e

... reset..

. Po in..t

.g

a. d e r.,.pi p i.n on '. t+,

4*.w (i~,.

.. p

.;,, scram water flo.

u' only s tatic head :.l.u.me -(he. der. to tank 'lV

p..Th. e.. S. DV..v. p g,"an'd % c..

e 3

tank) equalized,.,and..

f r... nom h a a

e

.:.W.

caused wa t er flow a f t er dra,,i.n 'and,v'ent'T.. a.l ve i.l.dsuresEt.."M.,.4, T.. M, ;

. 'Q...,..

4 N

m

~g N

h$f

~

r

.y..q.

..+,7..(On the automatic scram,;the scram signal was present' for#Qppf-Rr'*

M.).3 ~...p. 4 approximately.5l. minutes,:therefore,?more bater[was'forEe'd M N k d'W g,,w 3

.,7't,.,

... f..... - e.. ^in t o t he SDV."and ~i~t.i~s~aTs*o.spe cul'a't'.'e"d' "t h'a t 't"he "p r"e"s s"u r'"e,~~..r~

• r~<"~*,'e' ^

.c.

. r.

/. ;..

4,,r,4 ; ' "i.w. '.

wi thin the.S.D..V wa,.s 'high.e r...e.h. i s hi. ghe.r2. a t e r.f. low. 'n

'. e.~

MT

~ '.

.c WN an.d.& < EI'M M_....

y".,w.; y higher ~ pres.sure. caused the shorter fill times on the v

n x

r b 4 s

~.:M.. ~n~:.,.n.w a.:

r-+t:.L.ge,n. ~'..A. ~.rgm.~.SDVT "@",

a.-

..i.,

p e. p.

.v.+ : ~

~

,. w. -,. =cW :. ~

~ g ~.

~~~ ~

- xn:.2

y g Item.,e - Measure. ~,....,.yp.. drain v. lve opening and closing.v.9'r

W r*

. s.,

u

.,.m k, m vent and ~.. y jq a

times ' utilizing t.h..c,' valve. 4.b em 'moun t ed.S. wi t E h.e.s.".o**. Tl.i..is'.a'M.Da $.

W.O '

S

- ;g,; ;.,.

measurement may-be,independen..f.. scrams. c" me ir m'rr e m" W O a-

~

. rA.

to D.$5.'.. :. :,

- 'MHMi W.6 Vent and d..ra. n.,f.r.;l.vx:f.*1?:.Cy';1r,%'CS**"2.T.,.iWR."WY 2 -p.nm ee. yjg.y. m gyg w

.,. : m...

am :=

4....m yr c'a c h' s Erars' by.'m7.t e n.i..n 'va. e o.p,e,n,.....i.ng a.n..d. c,l.o.,s. i.n. r a

m es..,we r e.

e

1. w.m cr hr.

m...,, w

~

...,y..-... rined ' independent of e.

is~uEiiisT,W..Ms i # '.W the time from. hand sy'and,just before".*D 'Und'6f *O17dyf*&

F,$.b, itch' ope a ion *t$ ih t

' ' b'd i

D2

e. c.positi.o.n.m.nd i.cEtion.YfiTheQo.,n. del ma. n,u..a.hs..o.,_la.tfioif. 4".l. o.

+

n

w. w%.,

.c.

time recorded for all valves is due..to the slower

. "*"Q"IN'r' m

7.v.' J =.....' Mf. charae te ris tiesof~t,h.cY.res t.#Nfe'no~$ E1Ve.N<'5.C:nN. response n'

,Ik. 9 7

.&. g-p 9-r?r4 %.

--- m e~ar cr me.wm.w m.:

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Item 2f -@ Meas %M+1Eytwi&'rMWi*'T*M**$3Ni;';tW*.yyMQ:u n.

At':.

&k J'....

.....,... closure of the SDV vent

~

m

~

and drain v. lves Sit ilizing" stem"*"'c-Ma*"W""**"'**'

a

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- ?

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lve closure.w--M.p,m v.,%,.wed.,41.n.g%*M@ *Gw*X m-a 4,w,,..,,:.;.,,'.

.. Vent and d' rain va..~ u.mw r

time was determined ~b ~mei pd.w"'"7

• ~n N

. c._ m.r..

':$iOJ,/fdWh"Ks'surind'*th'e'~tiEef'~r$7scrEditia'Yidn98YcM6FIf N1Y"e EE'b'E,"ry~'n position 'liidfcdtion,".s.%ThM. A.Eh.F...~M. 6.TitfTt,'Me' rye #"Me'M b A.."C M. w.9.d.~'u~.m.or

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=*W W8Wu

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M W T *. &

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s'ea.M ciee.w.+,4#'e rr'u'mee.wavWtM.WedWa+b'- ~vr.hM.tm.M O i,. ~.,t-H'/'is=4'-

• W' qW -^

L9

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• s'i4 "%T.+M *d2N4 *E' '**^*M MM&*P**4** M * ~- h M* N M L

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+ y* 2

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.=

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w m~ -2 *

% w.

rh

,y~m L & w.t w=.rme :w.~.&:w:cW.d.mm* men ***W eq. %~..e ~.

w %m.mn66em.

w

.ny e w hm pwf me ce K r,.m:m w n a n,nn x u x :~a w-za k'eclY'MBN:Awnt*:WP$' 'ni':*'Wt;*:af.L@^**,L,.;CZM".s."W3~5WJ32aM1Ms'.'m%M MRC3.$$a;5iiRik

i e

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n $54%. gE-;c:ssu.,azd::rm v.W.:sWJ.dt;mb40$%r;;rg:p:

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s..;.:

cm.:s -

Vw=;a in- _

o>-

'I" h.

.t ument-voi.ome d(w h.srge

'".m-T

,.I t em 2g - Sam.p i e wa t e r f rI~n

.-si

- :.. e,.',.,...,

.!.after cach scram Cur particulates..- 6 ;.:

.J 4'w'. ' '#i'

m.. k. a:5..s :.M.:w..

ew.:.

s

w. - :;a...... m. w -:.,... w -r:1. m~:r: te. i.;: ;q:.< w... w-~.v.-~; n 1

.w :. s j The wat er sampic.,.:.:u. r :. ; :tw.....a. m:::,:, f roci.the.Scramf Discharge.Volu w,., c n:.a.r,y wn

$... q,'i.,. ~

t.

-- me..Ta n k,j,g,.,,

f,, :.

.g

.. m

ij.p.,4 ; age.,x, (SDVT) wa

: obtained by meanstof s'connec' tion 'added tW4.sp.',chuGA

@fh' 4 i,','

a n ex i s t i ng'liG Uuin~e'n't *d i%i&-4TnEWF61Tddi nipc'Wh M8:Tm',NWWMM M R 2. t

[n' @ I W 6n M Ta N M' O#

Ma,%.,. - i.-~. sys t em p res su'.re97.u'sti.c1'1 e0.>'ed ~ b.N.w usedT to.;.;. a~' caw me e.m.. r.::@*..,ytr i' I

a

.' and an auxilliary c.v.ooler was.w: c

. m

. - a -

~. :rge m.-..

cooI.the. samples diC.fY ~"e;hW*i'05 r-

..e ld. '.

,7u f each wa.m.l.37 5' "ml.s.'.ampl.a.'s',lde re

".nt rati,n5y4;g:.. n.p

, Approximat.ely*/

e th 5W' S. 3 r.g?

-?

a.m v wu a.m n

n s.f ltered,so That a. particulate.conce on.q.i

.j,.i.

co

.g..

.. m.n c# e.:-

v.;:.~

m p.

v%.M. z.1 w.m..~W.W.W;N';9J.* P."'W.r'y"h,@w:-DSta'*.'sl

,a.. *..,

.,t.

'? The amount o D~p.,. a :-

J s?. 5.p

)n.z.c W:= - t-l~.

.:.x;n.&

*M.

-~ m %:;N.h. the scrams,,..a.r..t f.E_u v.,aY(.,d'.wi t h i present.,. cot.10.wi.n_.

la t e.

, u. 4- -t.c:.u 3..... -

. was very small.s.

. pm.

g. memz,f,rg*f

an n expected levcis.

1W.Y.9 y.

www

... :s m.;... :. <..~..a.m.nZ',i mw.v.:.~e.wes*n_*:,&.;m.v;wenv.w'.w.,w,.r.&..m nr;. ~.M.,T.:R

.. w.

.A

.m m.

-';"...,-,.-m..' WI t im ' 2 h 'Helisu'i'E*'t h~e'~1 l'Ee'Wd Miii'S Df"G'~F re p ea t 3b l #.[. M~,MR

..-, ~

.s..,;1 eye 1.a..

w.

n w.

=-

n_ = : _

=~

m-n =.m c

o.-~m.: ;9,- mus u; Wc. q.y.. v.

... w_

.; ;c; ~

.y v

n., --

.ee.. e u,.

r.e, ~, w.. -. - -

- - n _ E m u,m

. N. % *,.. yg Data was gathere'd 'nianually' using"a' slo ~p"watcli ;1ocallyf' yh.W99,.9*i

f..'Ya t the SDVT.fJhc(clock was started,upo.n"r

,3 '*N

- red (open) l..ight on. the,S..D.V.T., dr.a.in, valve. eceipt bf c t.ae t ua ti on.,3;g,m.,. y;gy%,g.g._e;a.w,,m. ar

..a..n..d......s.t.opped..

.y

• • oe at.

..W

? n f.Y;,. c..,

.svitch rese.

_ ;c:.9 y -y n.rg-, g g

. c '.

.....M.,..,.s....

4..4

. d

,.r ~~1,-

- e,. e Ba s ed upon. u.m,:+.l t.s. :~ob ta in e. d.w.a..m)....

.a..:. n ti.-.s. 2

..s

.u w

...w,.

,4,

~. -

.+........c..s..

w.

- - ~, -.

n..- ++ h t '.s - s y.f. ~ ty %c,y

,v.

y...*

r*c' p'.'

g...

th e,we s.:...rev fo.m

'?.W-~<..ug'C...;.'t., :

t. head e r,ha s.,da.t.he,S.DVT. !.

7 fro

> r.e s.u..

p

-..us.:.t.es ts :

.L.

K.x.,

. rained. p y y..

y,.,g

.. y J. r. switch reset occurs yhe~n.

• emn t i ed 'a nd..~1 eve.l.,'s.w. i..t c.h. es. '.h' d.ra.. i.n.,,,a..,f.t. e r.. the wes,t. h.. a. s,ggggg

..The eas t h.e.a..d..e r con.t..i. n. sue.s. t. o.

-c.

. ~.m..

Smm

. m,. d.o. w r.

4, M v._. n.:' ~c.*.

o..

4,

.a ve..e..s e t.'. ** C *i.MP5"," r ".,.m".w'*y*F. t.b

.c o

l.

3f. e v

e. o 4

" :4 '

r t t '... - <:W....

~..

)...u.. n viy. c :5, W Th"e.long:e~r t gme.to qsw tch.+b. ;.::W...:4, m.yw.eO.;a,2,M.%

,.w 2-reset on.the.p.1 h.,. m ar. p. em.,:r.ur <. :..

- w ~ w aa mWss u

utomatic sc.

l

^ ram;q.,..

. i s d ue t.o ". t,h..e..e.9 a r.g e. r. :.a. moun t. #o..f.Wa t. e,r.e

. ;p

.s. 9..

T-W M

. g" rM,a.y e

...p"~..-

m.

which is due<to.

t he. longe r.'t ime"'ito s c ra m,res e t '.'. J...ff.'.*1,.,"4A'yi,;,,&.... jf;g

~

Ed s.1 ca.

S T h e t i me.f o r..s..m.._l.. ewe.t %.. :.w.. _, m........ :i u.v,

,.. m.

x s.

.,e..

. s.e.w

, -w,

.. -res e t.

....e.m..n.s.u ': -...-wi w..w.....4f on. t. he '. au t oma t I c E s c ram,'i s,.v e. t.w

.. s..u.t.c h.

m n

consistent.wi..th "r~cs,ul ts i.ob t. al.ue.d. 'o, P,p.6,.s I'd.uM, T(4p'p"c.h,d. &.t'm*d.:MW.1 Ee

~

,.,,~...~..

u,e 3., wp.in 'the

• ves t : heade r 3 f rJinirb. e

• 46._.

s... ~. J

2) f or times'tto'. d ra

. _.r,T17tFsin t w = p._.'yWW:I@PWW n.e

_.. u....v...w...W..... D ra i n t ime< s.d,..,.. w.... _.a.. n...,,. m.... m.....,r.8;.u..,,,, w w,. w..a w,..,.e,, 4: n..; m w,.u.,w

,o. _

.=

w..,.

r.

pre.v.l..~.._,

.ou_s..s.cr.a.ms..s.h

.....e..

.....,r.o.m s.c.. ram. s.,es e t.ts_e. e n i n,

plicnd.i_x :,p.7.. %w w

.s.

. '. - 3) are sinnifl'eant'Iv~ short'cr 'butSini t Ta lWnnd I t'i6ns WEv?.2'4-MME rs

- G 5~.c+w 'dIffeEe5t.',r;;d h klW ss;UV6 W lM % $ n.7.';. N N N N M D

.,. i q

..g.

dr 4>.: i.g:.

and associated'y :,m. m~for.5. &.; 4;fh..

?%*~.&g

.. is 'an,

.m

.c

' Item.i - Monitor the SDV, g-,

~.

mm

%g#'*y~

. resElua piping

.,9..f.i..W.:.:~.. On.s..

mr w/

wa te r. j -

.v.f.Y.M. M M.*n'ttsM. -

x-l~imn cd. cQ:. - n;.uWN.u-r.Ke."h. ;;;%w;.,4

~~~

n g/1

3 m-,.,h,4,.r ~

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M m.i c *

- t'- LW

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.g '. r m.u

. Upo n d ra in ing t h. e.,.sy s t em...'.a f.t e.r.3.. a c. h ; s.e r.hm". bo, l.li.'.he'.d d.cYs..'.Wr'c w

sw.y.u,,

,.%2.

.. examined with,. pit rasonic. devices;"-to.gle. term. Int.d.i fiwa,h.

ter.ivas.Wowwo.s

-mu r.: n..<.: r.

- sar still prescht~.,mTh~es- - ~ i~nt'was.e EfE. m.w.

. saa

. test.po w en o

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m w-

,RG,M.r gW.. itW,*.*f,#',r'p'ipinf~Lhi.i.'i,*f..!Ie'02.71,'Rch~*d.I.IIE7.o"n*6M..foI**c"E W

5 llE v

isem = headers were ve-ifie.d....

e :.

m.

+ ~ 4 = ds'= hw empty of tey. both? scrams.x,W.. p M r1.. e:.m h

t. T/q% n M

.au :.r e -

r rr J.mcg.74,s,<..

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$MSM,$. ' Item 2j :".Ver'if$lig0,'sc[cyuf~ del'ay'*o c[$fn j Ee' $ sT M,$ $ $

.~.v.:,,m.,. a. funetioning p.roperly.. W~-~;: r r'e.-m. fr.wr.;:t am_

- t;m,

2vn

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s f,2, _. h.y r.. manual scram.; reset 13-.se..f gnitisted continugus,,'a,tt.cm

~~

-w

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e

- ~

f a t'l o.

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a ~.- - _~

s.igna

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?'@CN'utt%W1MsVkN5f@IMr.MLm

^NF 2

t

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um=..

-w. a-- :m-

=r.-

m e n::t/ms:e:r,.r.2,nds.n wnru vrrr-lcmewerurww,uarks a.4ecA,. ~. ew.:..we--W t-w

,r w e rm u..

a-~ r-m~x.c.. ug n

_Mb*f*iC' L s.~.. J C.***4M.'-ZEN.W.M*22DM.C.Ni*."'C.?,,*.-d i?rD"*3t* *.C'T **/J" M;Mth *.'. "2.Y.Tr--MN%%.

Page 4 minutes eftcr the ceram was initiated cnd therefore the cutomatic scram could not be reset until they were cleared.

Subsequent to s

each scram, a surveillance test was performed which measured scram reset time.

In both cases, it was measured at 12 seednds.

Conclusions Each requirement of Bulletin 80-17, action item 2, has been addressed and the associated data compared between scrams.

In ad'dition, this data has been compared to information received from other sources (see Appendices 2 and 3).

In all cases, the data was found to be normal and anticipated or explainable due to test conditions.

It is therefore concluded that the system is functionally normal.

gg,,.y.

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r

y

. 2b scram solenold val'e'hsei

*/*

' ' * ~ i ~ ~, T ' " C v

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de-energize with scram yes

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W'

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1. .e w.-.s.:

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through tysekup v'alves.,.,;y,.,; tyes,pf,;f,M.

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+

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m

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" 24** E,, M J..2 [ S %

.<. c :

c,a :... -

u,_. --.

- high level rod block 59 see 35 see.

- high level scram A 2h2 see

...g - 49 3ee

- hinh level scram B 281 see

• ~

• 4 9 3e.," ;

- high level r.crar: C 283 m.:e 50 we

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vent and drain valve- '

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t: o vent :85-37 B. g.

gg.p....c.w 15 sec' MW.E"m15 se.r N'f vont 85-37.. C lia, ~9h.

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n r A w.,Al'.I'ENDIX 2

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'f3

9. ;J M ?. p ' <%.rNW.'>

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st

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450 tis.mti&w r

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Dra in. tic:c,,..tes ts.o f. Llie. SDV. ays t citi were,performeil.with','^j.o..h W G. ft I ?.' 8C. ' *.. the followliig fiit t f al conditions :

,.,Nlp.u;...

N

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~ '

a E l N*T.

. 3...

...,"2 ".,.; -

a). System filled and verifIe1 liy U.T.

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o,.

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b),,, Vent valves open.;

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m.. 4

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a

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m A

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tative.results from two of in te.sts.

"2

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Te t. t A Tlioe Test B Tin.e

..' Event

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Open drain'v.tive

~

"C" high level seran reset 9 nin 22 sec 9 mfu 35 sec

~. ~

"D" high le.el scram reset 9 min M. see.

.v y9 West header ecipty.by U.T.. '719 min 2B set N.3 min 35 sec,,,.

r

.~. s q u/A

.r. 7 illigli. level rod. block reset '-- 10 min 12. see

- : 10 mitt 16 see

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1.1.em in 2.0. r.c e -,

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APPENDIX 3

~

.s DATA FROM SCRAMS PRIO1: 10 JUNE 23, 1980 Event

..e..-ys v

Time

..y.....

s.,,.,

Scram No. S1 1-18-S0 Time from scr.m to receipt of high level scran switch (avg.

m of 4) 53 sec

..e..

m

. _.......-".L.,....u..

.,..,.... 3.....~.-....,w........,..y

.s.._.,. r..

...g Time frem scram reset (opening of

.....,~.....m_

drain valve) to loss of high

~

. yevey scram swgtcyi (avg. og g 2

23."se-'c* -

~~ ~"

Scran No. 82 5-15-80 Time from scram to high

.....,..,..,.o.

u:..<

.u.

t level switch actuation (scram) 51 sec

~ ' ~ w "J

..s.:..,u..

Tine f em reset to loss of high level switch (scram)

+,.., 24 sec..*

2.... w.

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Scran h.o.

8.,.

....-.6-7-80

~

s.

m...

Time frem scram to high level switch ectuation (scram)

~.....:.a..

,..,< h w 46 sec wu.., -]...

.m.,.

-- n Tirm f rom reset to loss of

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m 23 sec i

.=

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i i

Page 8 Item 4 Action item 4 has been completed through part d.

The preliminary training required by 4.c.' has been completed and the full training will I

be performed within 30 days of the Bulletin date.

j l

Item 5 Action item 5 has been fully implemented with the scram discharge valve being monitored on a per shift basis for residual water.

Item 6(c)

We have performed a review of the standby liquid control system (SLC) to 1

determine if 2-pump operation is feasibic. The results of this analysis have shown that the present system design is unable to support 2-pump flow. Listed below are the problems identified in this analysis.

1.

The system NPSH is designed upon the premise that a single pump is operating. - Parallel pump operation would increase the required head to prevent cavitation.

This additional head is not available, and the result could be pump cavitation with potential destructive results if operation continues.

f l

e 9-v-g

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0 ~-

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2.

The discharge piping is designed for single pump operation. Parallel pump operation would result in lifting the safety valves on the discharge of each pump.

Should the r,afety valve fail.'to reseat, flow to the vessel would be greatly reduced.

Rai. sing the relief valve setpoint is unacceptable because the design pressure would possibly i

j be exceeded.

Also, operation at high pressure may overload the pump motors.

Overloading could result in loss of both pumps.

i j

3.

The FSAR, Section 3.8, states that the SLC system flow rate is designed to preclude the possibility of surging the reactor with boron slugs which could cause the reactor power to rise and fall cyclically.

The use of both pumps to introduce greater quantities of boron in a shorter time may result in just such an effect. To ensure sufficient mixing of the boron, the system is equipped with interlocking contacts which only allow one pump to operate at a time.

Item 7 Item 8 of the bulletin also required a report in writing within 10 days, regarding the analysis of Item 7.

Browns Ferry Nuclear Plcnt is equipped with ATWS related RPT; therefore, we do not plan at this time to submit an analysis pertaining to potential deratings.

O e

,