ML19338C741

Forwards Response to IE Bulletin 80-17.Proper Scram Solenoid Valve Bus Operation Verified by Monitoring Each of Eight Rod Scram Group Buses Independently.Scram Discharge Vol Tank Alarm Malfunction Rept Not Required by FSAR or Tech Specs

ML19338C741
Person / Time
Site:	Browns Ferry
Issue date:	08/01/1980
From:	Parris H TENNESSEE VALLEY AUTHORITY
To:	James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
References
IEB-80-17, NUDOCS 8008180665
Download: ML19338C741 (6)

Text

I .

'e TENNESSEE VALLEY AUTHORITY g CH ATTANOOGA. TENNESSEE 3,7 8 b- I j ,'

_ g - _Mh Md

~

, 500A Chestnut Street Tower II

• August [1?,Sid80 A0*l7 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 EhTORCEMENT BULLETIN 80 RII:JP0 50-259, -260, -296 - BROWNS FERRY NUCLEAR PLANT As required by Action Item 8 of OIE Bulletin 80-17, dated July 3, 1980, enclosed is our response for Browns Ferry Nuclear Plant Unit 2. The results of testing performed on Browns Ferry Unit 2, to comply with Action Item 2 of the subject bulletin, are provided in the enclosure. Test results for units 1 and 3 have been previously provided to the NRC. Testing required for item 2 of the subject bulletin is now complete for the Browns Ferry Nuclear Plant. If you have any questions, please call Jim Domer at FTS 857-2014.

Very truly yours, TENNESSEE VALLEY AUTHORITY c

H. C. Parris Manager of Power Subscribed and sworn to before me this / de of JinnaeX 1980.

U

( bc /b / c (W Notary Public My Commission Expires /d - [ ~ [6 Enclosure cc: Office of Inspection and Enforcement (Enclosure)

U.S. Nuclear Regulatory Commission Division of Reactor Operations Inspection Washington, DC 20555 , ,

9 FFICIAL COPY 8008180(o(o5 An Equal Opportunity Employer

III212 - BFE*NS Fr.RRY h"JCLF1.R PLANT - OIE BULLETIN 80-17 g.. - - . . . - . . -

. A

- Each specific rcquirccent of Action Item 2 of the Bulletin will be discussed separately. Results will be discussed and evaluated with respect to antic 19ated response. The manual scram was initiated via the manual scram buttons. The auto =atic scram _vas initiated by intentionally caking one APPR inoperable in each trip syste.a. .

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 rf usin; a stop watch 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 ob-

" ' servar was satisfied that all rod motion had stopped. The times are necessarily very conservative due to the observer "

scan tiac required. For each scra= the observer verified tines were very similar. In each case the recorded time was faster than the technical specification scram time limit of 7 seconds for 90% insertion of any individual rod.

Scram timing of the B sequence rods at beginning of cycle via RTI-5 identified 34-35 as the slowest rod. This rod was observed during the canual scram and was verified to be '

fully inserted within 3.3 seconds via stopwatch. For the * '

automatic scram the slowest A sequence rod, 22-11, was similarly identified and timed. Full insertion was re-cord 2d in 2.9 seconds. The scram time data used to select I,,

34-35 and 22-11 as the slowest rods indicated scram times of 2.8 and 2.9 seconds respectively. Based on this data, it is concluded that all technical specification re-quirements for control rod insertion times were met.

• Item 2b - Obtain voltage at the scram solenoid valve buses - - - -

to verify that these solenoids are deen'drgized upon receipt , .,

of scram. signal. ,

Propar scram solenoid valve bus operation was verified by t monitoring each of the eight rod scram group buses indepen- -

dently. Test data showed that the buses all fully deenergized.

at the time of scram and reenergized upon scram resee. -

e ..$. .. . .._,,,

. . . . .v.

% i . ..

.,,..e

. ~ . . . .

r .-...u..:_.,.,..m.....w........e.

_.~.. . n -.....-, .- ...-- -

- : ..,_ -.,.-- , , - . , - - - . , - , - > -; m.- + , _ . ~- . ~- -., ,m ~. . - & ?,) -f 7  :

s : L. p. - , . . . > - ^ g.

6.,. . . .. = a . ., .i..i r s S . 14.%. .

. L. . r . .- .v . : .*

a ., . .; , . a .c'.,.

,. .g..:. ,y. . a . . . W. ye ;. .. .

. ~_.,.u . ~. . ,..

. z .s . .- .- .- . :. . . . s . . - . ..

.. . .. - .  ; - s._;.  ?. -n f.

.. -  ;;;4.c.. y _s

,_ 3 _ . :.y.

. .. . s . . . - -

. . . . . .. . , ,. , m. . . -. ,. .- .. a. . . ,. -

• ,,. w ,. . c , , ., y . .f m.2,s , . -

.s -

-x.. . + . ..c........_.;,.v_...,.. . ;. , \. = . y 4, . ez.e r . .s =.9 n. 4 -q -..;.........-.......-

. w y.;.-sn. . e ... . - . . . .g . . . k.' ,. r k t . 2 ' - D 4... -. .(J..u.. . . . . '

l -* d~ ' 4 E.M "- =? '.;;. *v. .s Jre. 5.0 r": - #~'-

$ -**..--. '~ I* U*~X - ' ~ *%~ S '

Y: 'E Y ? N - 2

, , ' '*;... x-. ..~ y:;. .'. '. y. .p..y, ., .

h.. M ...b..i.

. ~

• ~ - - '

. . . . . - - . -.n,..,,.

w f , .,. .

.-e

~

,...; . ,s .

so e

. . g.2 7 7 . ". . yvt -

.e. s .

.:,.,o - . --. ~

. . &. _ ..- . . '.Q . a. . .

_, *;k. s -.

a . a ._

<_. -. ..?., :**. : ; ;- --. . a. .;

b ,*;

. ; . ; . , _,..-. . - _ y- ..

s *t 3- n_ _'x L i 'j;..s,. m .,,,,,_ ;. '_. r .

.a .

_! - 't._ ,;,,,,,,,,, n s. .. w .

3.".* -J EFut'M.3 Ma *#'1*"** *N't 7.C$'n e7,s['ee' .*Evi .eZ1M5~

• c.d'T** ' E'.Jd P.1"MT*h Wr[*kt '.'I.am".h fCJ s2.e3s.W# "^ '"~# 1%bMN - -

M

+

. . Page 2  !

. I s

. Ite: 2c - Verify that scrs= valve air is relieved thrcugh the backup valves and that the, backup valves are fully

• open and rensin open during the presence of a scra signal.

Operstien of all backup scrs= valves was verified by using paper fisgs to observe the release of air fro: each valve tested st the ti..re  : of scrse. .

Ite: 2d - Mcssure instru=ent volu=e fill ti=e f ro= scran inittstien to high level alsr=, rod block, and scra: points. -

The fill ti=es en the SEVT fro: scra: to switch actuation for the 25 gallen and 50 gallon switches were obtained from .

tha sisr= :nd saquential events recorders respectively. The 3 gallon switch did not operste and therefore data for this switch was not obtained.

Ite. 2e - Measure vent and drain valve opening and closing times utili:ing the valve ste: counted switches. This

=casure=ent may be independent of scra=s.

Vent and drain valve opening and closing ti=es were deter- "-"

cined independent of and just before each scran by measuring the ti=c frc: hand switch operation to change of valve )

Fositicn indication. .. .

Ite: 2f - Measure the delay ti=e frc="scrs= initiation to closure of the SDV vent and drain valves utilizing ste: .

ecunted position switches.

Vent and drain valve closure ti=e was determined by mea- . . _ .

suring the time frc= scrs= initiation to change of valve '

• position indiention. Tha longer manual isolation closing ti=e.

~

recorded for all valves is due to the slower response chsracteristics of the test solenoid valve.

. -- 6+- .e . . & M -M pg. g g pg . e

.......+.m . . . e w .* - .v - .o u ;. -. ->..e . . ~ . . * . .

, . . . . - . . g.....-. . .p..,.. .

. . . o . . . . . ~~

...-4 "y m. g . ,

...-4 a ,*..l. .* .-. Q -'- .. .

s. -----.-.-+.-K.. .

,. ..e.. .

. ' . 1 s. .e ~* .'

• ne , . s M. . . .

^

U

.. ... _. y .

. . . , ~-

,[ sy, . . g , , ,, * . .

g, *'T.*E.. .....Q, " . , *,

. . *.e .= R- ' *

. , . . m .. gee w e e' 4 e . - _

.M A. m.=.i. * . = . . .

b m. .. ..h

.e. = * ..

=e-*e.

.h-8 *=*e**--

.em M#1... h *b . - - " - -- - - _ . = 5.

.g.-  %

4 % ,.sp7deg4 .td b p 'e *-h,*e-.

., ... . . [.' . . . . . .. ~ . . . h**'..*.' , . . . ..

2..

. , - . . . . ...r-. a.7

.. w2 s .. .. ; % < . .:. .m . :.: ., . . r -

,' _ %I . .y7.um== h ". . [. h.t S, ^ , "

. 7 h, . .- '==-* * ~. N h .4w.,[

n

( .-. .. . -e,,...-..y.

.; . . . _ ,. :n.- . . . .

.e e 0:n.;.1.,. .; Ls.:. ... ._- . .. .~2 f. ;;. . *. P. ; .n. .,.g .--:.s. . . . .u-r2 :4. . . ,.:~ne....

-.2..?

.,- :3.w s.

.y..z . 4 . q ,.a . .y-. .v v. .

. ~

,. - . w

. f .

.* 6 M N w .e e...p.- e

. . . -4 . p ..h. e. 4 ww s;.w , _-

a ,. - m: m.sa.,.,.m w a : ; - . . ,...?

g,. 9e . w

• . . . v M -e . . - - W . .

W"f..K .%2* ;.t:;lrCE.'.W'

. _ a : w.. _m..

• .X..N.* . -" ~~' ' --* ' -~~K.C' ::.770. rJ' 4.* Car. m;-A- :rr6.~. M.~. WaK T u

Page 3 i

Item 2g - Sample uster from the instrument volume discharge -

after each scram for particulstes.

, The water sample from the Scram Discharge Volume Tank

-(SDVT) was obtained by means of a connection added to .

an existing instrument drain line. Following each scram, system pressure was relig.yed by opening the vent valves. _

and an auxilliary cooler was used to cool the samples.

Approximately 375 m1 samples were :ollected and a portion of each was filtered so that a particulate concentration determination could be made.

The amount of p kticulates present following the scram

, averaged 8 ppm and was within expected levels. .

Item 2h - Measure the time to drain SDV to a repeatable .. .

Icvel.

~

Data was gathered manually using a stop watch locally at the SDVT. The clock was started uport receipt of the red (open) light on the SDVT drain valve and stopped at switch reset actuation.

Based upon results obtained from previous tests the SDVT switch reset occurs when the west header has drained.

TI.e east header continues to drain after the west has ecptied and level switches have reset. '

The time for switch reset on both scrams is very consistent with results obtained on previous tests.

item 21 - Monitor the SDV and assccisted piping for residual water.

Upon draining the system after each scram both headers were examined with ultrasonic devices to determine if water was

• still present. The test point was the low end of'the 6 inch ., -

. piping where the 2 inct. drain connection comes off. Both headers were verified empcy after both scrams. ,' - -~ - --- -- - -

. Item 2j - Verify the 10 second delay on scram reset is functioning properly.

Immediately following each scram signal the unit operator initiated continuous attempts to reset the scram. The -'

. scram signal could not be reset in less.than ten seconds , , , , _ , , . , . , , , .

in either case. y s. s , .,- -e - -, , , - ~ . -_ ;~ . - -c.- c~- v~ ;. :- ; * ^." - -*

," .~ ** ~~~ *

'#4 N-

• a

..)... *

. . . . -. .. - a-..

~. . .

. ,. . .- e 'o 'O

• '. o! , ' s ..: . .e .* . 's -

a.. ., * ' *

.. ... .. .. .. .. . . . .. . . ... ... ' ~

., ..gw...~-

. = ~

S - s- .- .,.ar - g v * *E +4r= * " -

• • .*****'Ja-**M%.**Ms#*M~.***."******g****--1 F Y" -

- .. 5. . . .. . 4

. ,. ,. J.. . . . .. .s ..

..  : _. ., _ r ~. - . .,.;.;,. f. w ...: .- - y ,. .~.3.~., . ...

- q.-. ---.e m - . . . t .; . - . J. : . . g j,. . . ." e,, A:h M

.v

.t,.

. % //~ ' C s L.. q y :..j. . . . :

. . . . . . . .. . .r.-  : '- W 4 -

.-.' . . ~. .

~ u .. .- .

". ' O bll,* . **, ** . N, , ' . 1;."l'- .; *'3

.'.'.,,.c C

• .* .'. *.L'i.,l' '.y%,,

• ~

, - :Y.J.. ' - . .. - ..4 *

.'J..

.4."#.1.* '...-.--

-. .7. .-. ,.

.s . , . ; . .

. 6 . * '

. I* '. .. .

• *: Go wis ,. ;. sm s M.. :.n '. - #

' ' :Q' .s- * ' ' ' **

14 Qw t' M6es' g* .vr *l ;.** 9; '. 2-; .' nac. .""9 t.'.e a _.. ' -

it*A**.:msi. x.*F& %? *."O' r *l%**J JP.%:'/".* h. MI.O.*E s * %<t.< .: ) .'?4,-~

Page 4 I

e conclusions

• Each requirement of Bulletin 80-17. Action Ite= 2, has been addressed and the recorded data compared between scrams. In addition, this da'ta.has been compared to information received from other sources such as previous scram reports and special tests on other Browns Ferry units. In all cases the data was found to be normal. The only exception was the malfunction of the 3 gallon SDVT alarm switch, which is not required by FSAR or Technical 1 Sp'ecif ica tions. The loss of this data does not alter test conclusions. It is therefore concluded that the RPS system performance is acceptable for unit operation. Verification on a recurring basis is recommended to maintain assurance that the system remains drained and operable until such time that final design reviews and modifications, as necessary, are provided to ensure recurrence of this it.c1 dent is not possible.

..m.

.. . ..~..,s,

.--..........-a... . . . . , , . . . , . . . . .

.. . 3 , , . ;. , . ,

.- . ~ . . .: .:. q .. .. : . . . . : y . c ,, _ : ; :. :.:

, .n a. 3,.d . 2 ~.w . ~L. ,% w . . ' 2 .*J:.1 ;.,' * [.k ..

. ..> ... .; . . . . .e .:.

e

. .,. :;. x . . 7,,.~ ,,.2,. .

.- . . , at - . *

~ .. ... .. . . .. a :.e.

.. .- . -...m s  :.. a. , -. .....

~.,.m..  :;.,nv.,

m; a;;:m. %~:... .. w.w , e, ,

. . gu=:. p * . ;e a-..m <

. a .. . . . . . ..

....-......:.:.:.w,..-.....;..<.,..-aa.....

.c... . .~ .. ._ .. ..

- .. -. . .. ;.,. a a ;<  :..ci - .:.. - .. : G 4.a.

Q. a .. . .:.' . '. .

' ~

., .. - .o * . . ,>. .:

.-. .s . . ::. . ; - n. **.',.1:~;.-*.: . . .; ; . . t. ...

a .: .: .

,u ",.'

,:.;a.-

- , . ... . :=. ' .s .. . ~~; ..:

, ,,. ? v; 7';. y_&.v.:..?==*,..

,u.;.;_..

3< .

. p .p. g

'.m . . . . . . - . .

... , .,,,L. -. 4 4 ,..__.:.._...- : %.M-. - 1. '. - . . . . . 2 .yl .a.

^

g.,; w g u ,, , m .. . . , . u. gga u., ;;,.x gs. .;/ a.. . m- . c., w w ,:c; ic- . . :, :. :

'_ .y.

. f.:**;.g.... . . . .:..g . . ..

. . m ,2;, .. .: w

$'.

$%'Xi,?.a,e~'t W::~'tkJ.L';M'e;s'.' s.. ,:'?. *?CC . a ~s':eL'#A21M'

. s h AYi. %i CE:

s. . 'WN*s:*A^ * '

• T' L'.:.5L.""~~ M.m"U.> .

Page $

APPENDIX 1 SPECIAL TEST 102 .

RESULTS s

tmIT 2 Bulletin Manual Automatic

__ Item Event Scram Scram 2a all rod insert time 5.2 sec 6.2 see individual scram time 3.3 sec 2.9 see 2b scram solanoid valve buses de,-energize with scram yes yes.

2c

scram valve air relieved .

through backup valves

~

yes , . yes 2d fill time of instrument volume to

- high icvel alarm .. .

N/A -

N/A

- high level rod block 28.5 sec

- high level scram A 32 see 41 sec 45 see

- high level scram B 40 sec

- high level scram C 44 see 37 sec 40 see

- high icvel scram D 38 sec 41 see 2e vent and drain valve operation time independent -

of scram drain 85-37 A open 5.1 see --

5 see close 193 see 177 see vent 85-37 B open 3.1 sec 4 see close 305 sec 283 sec vent 85-37 C open 2 see 1.6 see close 221 sec 210 see 2f vent and drain valve closure time at scram ' " , '

drain 85-37 A 13.8 see 14.6 sec vent 85-37 B 20 sec 20.4 see vent 85-37 C 15 see 14.6 sec 2g instrument volume sample ~

after scran-particulates 8.5 ppm 7.5 ppm ' -

........-_s.~... ~._...m.+-

2h ...: ..

,_ time to drain to repeatable . . . . -.

. .v - . . . .

,. . , . 7. .w ., . . . . . . . . . ,

.a, . . .

- - 3.y, . c . . .%. , . - . . ~ .: A - -

- high level scram ~ . ; .- 478 sec . ,,. ~'.521 sec ,....

- high level rod block "

.- high level alarm 524 see " ' ' ' 5 6 9 s e c ' C'" '

. ~ . -

. ~ . ...

N/A . .. . .;-  ;.. .,~,- - N/A 4..

.- c--~-

.3

.i _ .. e .. .,.,, ,...rs..

monitor SDV for water % .c . . . . , .  :. .-

,... w ..;;.. .

after -2 -- v , - -e

-$ '. ...None..;

. . ..,-.,.. p....'...C/

"- . .-.~-.

,.. . w

' '.r *

m. , . .

+. - . . - . .?. . =. . . s. .; . . , ....

. .. . d .r .a .ining - ~~:% p:: ; ..."'. .

.:.  : . . None

.  %. pu

__. . ._.r_.. 2j . .,.. . : . '. .. . .ve rif y 10 s e c o nd d e l ay - '.~..,,,~ ~ ." _^..#..;'

y.':"_","

._ -- " w';^-."_ "._ ".

on reset ..,**- -

.. . . - . . .. , >10 sec ' c '- '~

c-.__

, . c . 1,. . .

,,,,y, .

.,, ,;- . >10 sec* d.;'1 .;, g . _j .

fu. .g. , , .;;j;f., ,,

..,_.g

. a,.; ,,.,;.. ;

s,,,.;,,

._.. .,,,,a _%-- .,;a; .

.g ? . s ..

renyW'.r. . .'e..:e.cr. ::he. -s P u1- a.".c e vie 24W:.1ur.wn .r.4 meront.bw mOAzte .-WW.-s.,W -*N

. _ . . . _ _ . - . . . . - -