ML20010H857

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Provides Response to NRC 810824 Request for Addl Clarification Re Steam Drum Safety Valve Position Monitors for Review of 800925 Tech Spec Change Request
ML20010H857
Person / Time
Site: Big Rock Point File:Consumers Energy icon.png
Issue date: 09/18/1981
From: Bordine T
CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.)
To: Crutchfield D
Office of Nuclear Reactor Regulation
References
NUDOCS 8109290360
Download: ML20010H857 (17)
v • d • e


Text

{{#Wiki_filter:r Consumets Power Company Generei offied: 212 West Mich6een Avenue. Jackson, MI 40201 * (517) 708-0660 September 18, 1981 t~ sCO 0) Director, Nuclese Reactor Regulation S' O k Att Mr Dennis M Crutchfield, Chief R SEP2 8193; Operating Reactors Branch No 5 US Nuclear Regulatory Commission u.s. mun e,%r as ccatum s Washington, DC 20555 (u / h DOCKET 50-155 - LICENSE DPR - ) BIG ROCK POINT PLANT-RESPONSE FOR ADDITIONAL CLARIFICATION OF THE STEAM DRUM RELIEF VALVE MONITORING SYSTEM - TECHNICAL SPECIFICATION CHANGE REQUEST By letter dated September 25, 1980, Consumers Power Company submitted a Tech-nical Specification Change Request in response to NRC letter dated July 2, 1980 - Category "A" Iteras from TMI-2 Lessons Learned. On August 24, 1981, via telephone conversation, additional clarification was requested by Mr W Paulson of your staff concerning the steam drum safety valve position monitors. This letter responds to that request. Item 1 The proposed "hanges include the following: "At least three (3) steam drum safety valve position monitors shall be operable during power operations. Also, one of every two (2) adjacent monitors oriented in each north-south plane shall be operable." Demonstrate that the operable monitor will detect actuation of the adjacent relief valve. Response to Item 1 The Big Rock Point Steam Drum Relief Valve Monitoring System is capable of detecting actuation of the adjacent relief valve should one channel become inope rable. Test results performed in January, 1980 during installation and checkout of the system provide evidence that considerable " crosstalk" exists. (Reference S;eam Drum Relief Valve Monitoring System Checkt it Procedures; FC-489-09 at shutdown and FC-489-10 at reactor power). The system includes filters, adjpstable in the control room by the operator, in order to reduce oc0981-0006a142 8109290360 810918' 40 DR ADOCK 05000 g g 1

t Drnnis M Crutchfield, Chief 2 Big Rock Point Plant September 18, 1981 the crosstalk such that specific value actuation can be identified. The crosstalk, however, is beneficial at Big Rock since all valves monitored are located on the steam drum and the opening of tny of the six valves necessi-tates plant shutdown. The crosstalk, therefore, provides an added degree of redundancy in the event of single channel failure. Procedure traces performed in January, 1980, indicating dB level and frequency, of baseline noise and relief valve " tapping" are provided as attachments. Attachment I reflects the background noise during power operations of each of the six channels during perfo rmance of procedure FC-489-10. indicates crosstalk between the impact channel and ite adjacent location for each of the relief valves; RV5000, RV5001, RV5002, RV5003, RV50*5 and RV 5046. These traces were performed at shutdown during performa 2ce of procedure FC-489-09. Additional information pertaining to the safety valve position indication system is pro-vided in Appendix A to Consumers Power Company letter dated December 27, 1979. Item 2 The proposed changes do not include system surenillance or calibration re-quirements. Response to Item 2 Add to the table, section 7.6 as follows: Technical System or Specification Function Undergoing Test Frequency of Routine Test Reference Section " Steam drum safety valve "One month or less" "4.1.2" position monitor check" " Calibration of steam drum "At each major "4.1.2" safety valve position refueling shutdown" monitors" Additional Response It is the position of Consumers Power Company that tne Steam Drum Safety Relief Valve Monitoring System represents a potential reduction in plant availability without basis for any limiting condition of operation associated with the system. The purpose of the position indication for the safety relief valves (SRV)on the steam drum is specified in NUREG-0737 Item II.D.3. Specifically, the clarification section of this item states: "(1)The basic requirement is to provide the operator with unambiguous indication of valve position (open or closed) so that appropriata operator actions can be taken." The appropriate actions to be -taken for a stuck open or leaking SRV are the same as those for a LOCA at Big Rock Point; since, (1) the SRV's are spring loaded with no remote actuation capability, (2) there are no isolation valves oc0981-0006a142

j r e Dennis M Crutchfield, Chief 3 Big Rock Point Plant September 18, 1981 ~ in the discharge piping from the steam drum and (3) no operator action can be taken to stop leakage or blowdown through an SRV. Existing instrumentation required to recognize a LOCA, major or minor, include as follows: - Containment dewcell/ temperature alarms - Feedwater/ steam flow mismatch - Unexplained drop in turbine load - Falling steam drum level - Falling reactor pressure - Rising containment pressure - Containment sump alarms - Appropriate RDS annunciators - Building evacuation alarms - Excessive noise from containment The steam drum SRV Monitoring System cerves only as redundant backup to exist-ing instrumentation. A common drain header high temperature alarm to the SRV's also provides additional redundancy. It is our opinion, tnerefore, that there is no basis for any additional LCO's associated with the availability of these monitors. +,/ -}u:m (~ Qtub.a Thomas C Bordine Staff Licensing Engineer CC JGKeppler, USNRC NRC Resident Inspector-Big Rock Point oc0981-0006a142

l ATTACHMENT I Background Traces During Power Operations from Procedure FC-439-10 Steam Drum Relief Valve Monitoring System Checkout at Reactor Power nu0981-0006bl42

i l l CHANNEL #1 FI-5000

Background

t.o 0 .i 'O CHARGE AMP GAIN Ig .6 EHANNEL # FREO RANGE 0-20KHz lNPui ATTEN -20dB Dufrui GAIN 0 .2 NO. AVG. 32 .l 20 .08 .06 ' dB b D4 llZ (HZ) _3g .02 b .ot- - 40 .008 y l_ L I 'l I .M } \\ V l V{ I 4 i I r @2- .h.. k. 1A b . cot -_jj i 1. l.... 60 Frequency w Bio Rock Pt PLANT 0 ATE /IIME1/24/80/2047,3tyt M p TAPE No. SENs0R I.D.

CilANNEL #2 F1-5001

Background

i.o 0 ....g ....i.... 8 CHARGE AMP GAIN Ig .6 CilANNEL # ^ FREQ RANCE 0-20KHz INPUT ATTEN -30dJ _ in QuiPUT GAlp 0 .2 NO. Ayc. 32 .I I 20 .08 .06 l-i sv ' l -L 2 llZ y_ ni l l 1 (L) P .. HZ gg pf 02 ( h Y fl .ob 40 M f 1 l t j Yhk g .000 ' I q r l l. gg J \\.Tf i J l - 50 \\ t .t02 - ] m .,.. "u . t..f....................,, N .wi q.... Frequency eo 0ATi/Tb.ti/24/80/2048. sR Lyt 887' PLANT Rio Rock Pt TAPE NO. SENSOR 1.D.

) Bd ( 0 0 '0 0 o 0 O 3 2 3 4 s 6 ly I 4 A } y l z H 9 KB <I, ,1 0d 20 b - 1 2 f D 0 - 0 3 I 1 AIN LII R A 1L O , G 1 S . P E E IN N N E M # G T A S A N T C ,'t Il L A A G R N 0 U P ilY E E R T V G N T U A A A E P T A H H R N u O f C C F I a N {l + f l O N E n P A 3 T 5 l

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CHANNEL #4 FI-5003 i.o 0 ....i....,.... .8 CHARGE AMP GAIN Ig 0 CHANNEL # FRE0 RANGE 0-20KHz 4 (NPUT ATTEN -10dB 10 OuiPui GAIN 0 ,2 NO. AVG. 32 _ _ 20 dB .c5 2 6 ~ (b) { (IVj i f}- r Tri 44 - Hz - 30 \\~ l c2 -. .--k j l l n a.. _ :m _ = l _y-p b2u_Q:'-m. a t ? ao 1 a g_,_ E :q f ~f' , k h -N "S i J Il g4__ . J 1 i J - 50 .t02, t .coi ,,,,l,,,, 60 Frequency Big Rock Pt 1/24/80/2052 88% PLANT DATE/Tipt P8R LYL TAPE NO. SENSOR l.0.

l B 2 d 0 0 0 0 0 0 0 1 2 '3 4 5 6 ,hN ) l z f' H -W K B 9 0d L' , 1 20 r ,H - 1 3 ,hW.. 0 0 - 0 2 i I i N u l I i R \\ I O i G ln] e S A in N E N N S P E E I i' i A N T G .M i M

  • C T A y 'r L A A G

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CHANNEL #6 F1-5046 i.o 8 ....i.... I CHARGE AMP GAIN Ig .6 CHANNEL

  • 4 FREO RANGE 0-20KHz lNPUT ATTEN

-10 dB _ to OUTPUT CAdN 0 .2 No. AVG. 32 .l 20 Da dB J .lL 46i g y 3 pg I ( ) ,l HZ 34 . - g,e u, i 7 1 N I I-30 3 L. f I l 02 .or-m- ._ J f 40 .M .008 - l l" 'd 7 i /tE - -f- ( ( ) ,.'I p j h L l f 004 i - 50 l .CD2 0 01 i.ii 60 Frequency Big Rock P.t 1/24/80 2058 88% j PLANT DATE/ TINE PWR LYL TAPE NO. SENSOR I.D. l l t

ATTACHMENT 2 Impact Spectra for Crosstalk from Procedure FC-489-09 Steam Crum Relief Valve Monitoring System Checkout at Shutdown nu0981-0006c142

1 i i i l IMPACT SPECTRA FOR CROSSTALK Ch B= OdBV Ch A=-40dBV .n- .7 3 ,j{IlI! {

l Big Rock Point 1/8/80, Plant down i;

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Ch B = In. pact l ll j; j-f:i' Ch A = Adjacent ,t l -

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VMS #5000 3 l 'l I. lj jt 300 G/V i All VMS Set at 300 G/V 10 dBV/Large Div. l ! ! !.O l / race A [ T l l,'il 'I l I l I l T I' 'lll j i [!m(* H ;. 'l j! ij!.h'! ; Tjfl! A l(4 i h; ll 1 iinie.: q t i 4 L k[ il 'W l Y i 'i' 4 l l lt! ji;! i I' I I k I l l

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l l ij [ Trace B i t,t-j,1;i i. . ;iI U I 10Kilz .1 .L L4{ .1 y 11 .jlif!,.. I' II!!!i! { 13.6Kilz ', i jl l !!!! ,j,1 j;, g I ! f, ; j,,j' Filter setpoints i; j 3750 to 8250 jtl ji!j jj.jj;j '. I1; 't ) .Ul 5 I I!!.{ \\ t y ~ !;) U! ' : u. _. ! I O 25KHz

I !MPACT SPECTRA FOR CROSSTALK Ch B = OdBV Ch A = -40dBV f '.?* l' i ll* ,4,ll' l f Big Rock Point,1/8/80, Plant down !!) Ch B = Impact g i ]im _L~ ~ ~~~-~~ Ch A = Adjacent .j Impact = VMS#5001, 300 G/V (All VMS) j - {.-- .[ ..] [ _u L til I I 10 dBV F ] t-~ ~ ~ M k fl yf

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Large Div. I-I .i i [l ( l 4 h {) if 5f l. k dlt.!' s{,d[, jg g l l,j j t j

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__.jjfllj i ll Trace B i l-s i 8K ilz .i; 4400 Hz l il jip! oj e Il Filter Setpoints p li ) [ jT i ' i;;.t$;',i 1* ' 4400 Hz to 8000 ilz i!l lT f I.! t \\ I ij .;:'.'!i, 4 h,,, i ij il l l j! I{ I i l ;! l I ! ' ' ' I ! - lal..il1_).Li_jd ll }! !I!Ii I ll I 6 'l l'!!.l' 1;' l

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i! O 25K llz a

IMPACT SPECTRA FOR CROSSTALK Ch B = OdBV Ch A = -40dBV ,C ' rr ..~iF l i Big Rock Point,1/8/80, Plant down j . l. Ch B = VMS 5002 = Impact 300 G/V [

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Ch A = VMS 5003 = Adjacent It li I il . I J Trace A y

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f k l hi , f _ _q .f 5 y . /. /[ 4 I. 'k_ l Large Div. b-k'- li f 10dBV/ i l } ( N l' k 1 ( )~ ~i d j 18.6KHz I ,j 4:f iill 4500 H-16.2KHz ,_... - l l

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t/.$!*TraceB I Yi'i Ii.:j j;. !!j,.: i 1{1 Filter sets: 4500 Hz to 8KHz -i ji;, u.m

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ii li} . bl + i il ill:. .l 0,'Hz -25K Hz

i IMPACT SPECTRA FOR CROSSTALK Ch B = OdBV Ch A = -40dBV if Big Rock Point,1/8/80, Plant down tliljiri!- Ch B = Impact = 5003 )

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! j. ; j.*. ~ Ch A = Adjacent - 5002}300G/V _{i 7 j '! i i 3 _p u... : i :.

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TyiU jl P Fijl{jd ' Q[j H[ 10 dBV/ WI'1llj-j; ;;j Large Div. __.__._Nj i Trace A f lr,l'; j T- [klll l: jlI;;1i {'. t m

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rJ'p'rt e. {!h ~ O .:l;;{ l '. ip ;i /, j.l o l. i p' i i 1 .I l-l'l} i 3,::. i !!a: 1 4 I q-N T-~' h >~. F -~r i' ' ~ ~J(~' ' ~ ~ ~~ ~~ -Y ; M' :Y ' il - ~(b .t.tl' jj _ (' t. .) i. L I. I. Li: ,!l' 'lri;!

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'~ i i ) 4 ,2 'l' l'g l I j' ;. ! i.. ' i : ? .ji: i ' M. ::!:': !'i! 7000 Hz I Iit ! I }. ll;' h .( 3800 llz !,...].i t 4.,. I i, . J.4 .m 1:! ;i, :!M..itui (' att i l $gi.:!! .t j !illii.:. bl. l ! ! ! g ' i. l j Filter Setooints 3800 Hz - 7000 H7 1*' .i l ' !.p ' '. '.: P. 8; O. ..Ll.1.!!' t l i t b. ____3' ..] il.i 25KHz

IMPACT SPELTRA FOR CROSSTALK Ch B = OdBV D A = -40dBV 7 q. j' ! g: i Big Rock Point,1/8/80, Plant down '][ Ch B = Impact i l-

[:ll Ch A = Adjacent I

+- h Trace A VMS 5045 - Impact l[i- . _;4,l_,; {- 00 G/ Volt _y7__ [_ . l ' .. [' _ l ' j VMS 5046 - Adjacen _.j 9 g.t. c _p' I ,7 I l' l lf it 'f

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_;.j.f I I f cf f.l.q. l k 10dBV/, l_ l (, ll! t _7.g -.y i. Large Div. y l i ( f L Im,l7 _g tji /k f f p ' / i 3 it y_ o p,q l f 2 7 \\.' 4 KHz k.Ll d' !;li' !l f 8400 Hz lj l3llllj;j Trace B l-tit.4.. 1~~ ~ i t.

i

. ;TM n t ]1:'; i >l Il l lI ! j i i, l l j. l fii. - g' L1Li. ai u LiH10!. . j,g,

IMPACT SPECTRA FOR CROSSTALK Ch B = OdBV Ch A = -40dBV ~~ = c. [ ~ illi 'l I i>l' Big Rock Point, 1/8/80, Plant down I' I J Ch B = Impact, Ch A = adjacent l l} t-I ' 4 Trace A t VMS 5046 - Impact 300 G/V !F / VHS 5045 - Adjacent '\\h l I! 10 dBV/ 'l l' l l l'l Large Div. l f l Trace B r e - r -- k[1 7 p tl 7 3 It r('t / l ii i r r p 'L((r A e ,jd f i t. 1 Ml I :'t %j f(, ( s k< 'q M f (0 f; 4 j s il l n n diify' di 4llV(jm/ -y a q y l ;2[ r e i r r g l I

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7200 Hz Q i t i. i i III !!-1. .k u{m I..%'. j l %miim aooo "' i r llllimiille i i I i: -. n,.m nETH u M u t O 25(Hz.}}

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