ML20214H157

Proposed Tech Specs,Revising Table 3.8-2 to Delete Refs to motor-operated Valves W/Bypassed Thermal Overload Devices

ML20214H157
Person / Time
Site:	Sequoyah
Issue date:	05/15/1987
From:	TENNESSEE VALLEY AUTHORITY
To:
Shared Package
ML20214H051	List: ML20214H049 ML20214H157 ML20214H185
References
TAC-R00141, TAC-R00142, TAC-R141, TAC-R142, NUDOCS 8705270292
Download: ML20214H157 (16)

Text

.

., I t

ENCLOSURE 1

!* PROPOSED TECHNICAL SPECIFICATION CHANGE SEQUOYAH NUCLEAR PLANT UNITS 1 AND 2 DOCKET NOS. 50-327 AND 50-328

,(TVA-SQN-TS-87-29)

PROPOSED CHANGE TO REVISE TABLE 3.8-2 (UNITS 1'AND 2) OF THE TECHNICAL SPECIFICATIONS l

LIST OF AFFECTED PAGES Unit 1 3/4 8-35 3/4 8-36 3/4 8-37 Unit 2 3/4 8-34 3/4 8-35 3/4 8-36 L

l 8705270292 870515 PDR ADOCK 05000327 P PDR2 l l

i f*%

e,,

TABLE 3.8-2

6. MOTOR OPERATED VALVES THERMAL OVERLOAD PROTECTION Valve No. Function

(

TCV C2 CC !sciation for Occi '.!atcr I'Itcr ikCV-62-138 Safe Shutdown Redundancy (CVCS)

{13', 02 00 C2 00 000 Opcration 1 ru( CCCS Opcraticr

-1TCVg2-0C 0000 Operatica R37 1 TCV -01 0000 Opsiatic..

1TCV-C)'\Ci Ccnt. Isalatica 1 LOV C2 , 0000 Opsretien

-1LCVC21{2 . C000 Operaticrr 1 LCV C212(g C000 Opcratica 1 LCV C2 12C CCCS Opcrctier 1-FCV-74-1 Open for Normal Plant. ooldown 1-FCV-74-2 Open for Normal Plan Cooldown 1-FCV-74-3 ECCS Operation 1-FCV-74-21 ECCS Operation 1 FCV-74-12 1 ICV 74-24 gmPump, Mini-f).wPrctcct: Pump

'" Pump, Mini- .cw Protect: Pump 1-FCV-74-33 EC Operation 1-FCV-74-35 ECC Operati n 1-FCV-63-7 ECCS erat' n 1-FCV-63-6 ECCS 0 ra ion De / ele edu /4f e e/

1-FCV-63-156 ECCS F1 Path

/

,'! ,y ,,./4 ,g,,4,p 1-FCV-63-157 ECCS F1 Path o y,

...~.,v., ,n ss n , ,- ,_.__. __

u.. gr// m,,,. / /4f, 1-FCV C3 40 OIT .7 u z.. 7--

Irjecti

-1 ICV CO 25 0 +,Iwjee '

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

4 3 bW WW LU W

[ .1.J U 6 b 3 U . 3 -

1 TCV C3 110 P

,-~ -,,-

r,u vs sv f.Z,-L.n_-..__

Prc; urc

.m__ . - _n _Ec-

. L. . . -dcry--

1 FCV C2 00 -

i ICV C2 07  ! "P,CS Prc :ure Ecund"by CSPressuraOcund2 1-FCV-63-1 ECCS Operation 1-FCV-63-72 ECCS Flow Path from Co t. Sump 1-FCV-63-73 ECCS Flow Path from Con . Sump 1-FCV-63-8 ECCS Flow Path 1-FCV-63-1 ECCS Flow Path 1-FCV ECCS Cooldown Flow Path 1-FCV-63 94 ECCS Cooldown Flow Path 1-FCV- -172 ECCS Flow Path 1-FCV 3-5 ECCS Flow Path 1-FC 47 Train Isolation 1-F V-63-48 Train Isolation 1 CV-63-4 SI Pump Mini-flow

-FCV-63-175 SI Pump Mini-flow o March 29, 1984 SEQUOYAH - UNIT 1 3/4 8-35 Amendment No. 33 t

l I

On:51 Toblc .I. 8 - 2 Aeplme.~e + /A9 < 1 1-FCV-1-15 Sim Supply to Aux FWP turoine 1-FCV-1-16 Stm Supply to Aux FWP turbine

/-FC V-/-17 8 m & p h la An M d",#4/a l-FcV-1 /g JL Jypfy 4, Aux Fwp d, 4he 1-FCV-62-138 Safe Shutcown Recuncancy (CVCS) 1-FCV-63-1 ECCS Operation 1-FCV-63-3 SI Pump Mini-flow 1-FCV-63-4 51 Pump Mini-flow 1-FCV-63-5 ECOS Flow Path 1-FCV-63-6 ECCS Operation 1-FCV-63-7 ECCS Operation 1-FCV-63-8 ECCS Flow Path 1-FCV-63-11 ECCS Flow Path 1-FCV-63-22 ECCS Flow Path 1-FCV-63-47 Train Isolation 1-FCV-63-48 Train Isolation 1-FCV-63-72 ECCS Flow Path from Cont. Sump 1-FCV-63-73 ECCS Flow Path from Cont. Sump 1-FCV-63-93 ECCS Cooldown Flow Path 1-FCV-63-94 ECCS Cooldown Flow Path 1-FCV-63-152 ECCS Recirc 1-FCV-63-153 ECCS Recirc 1-FCV-63-156 ECCS Flow Path

. :CV-63-157 ECCS Flow Path 1-FCV-63-172 ECCS Flow Path 1-FCV-63-175 SI Pump Mini-flow 1-FCV-67-123 CSS H: Ex Supply 1-FCV-67-124 CSS H Ex Discharge 1-FCV-67-125 CIS Ht Ex Supply 1-FCV-67-126 CSS Ht Ex Disenarge 1-FCV-67-146 CCwHt Ex Throttling 0-Ry-C?- 2cS * %ri B!d ///, IaL%

o-pcy-67-202

• T .L B N d- r,* M -

0-r&V-20-/ " JFPo Mx 76dflc O-fc V-po-//

• JFPLJ th T! vow l*

t-fcv-?o-tr3 RHf Hn D HJ .2%hh-j-Fiv-, o-tri A H R tis OJld Isok%

0.Fev ~M- 193 " Sff[] llb" ItelN**

• p.fcv-70-194* SFPCJ ll.lc hhNM .

D-fc v /9?

• JffCJ //d* DoNN'"

o-rcV -po -199

• SF/Ys Mdr &kha o -RV 204 * <Dt*E rsddo-

)- S&V-70-201 CDWE Tballle p -fev-70 .20 f

• CowE Zrokhn Common Ar t4d> I .,A .t l

l 1

r ,. .

TABLE 3.8-2 (Continued) '-

d/d m L. f.y 4 / ry du *, M MOTOR OPERATED VALVES THERMAL OVERLOAD PROTECTION

~

J L le / /fy k w J Valve No. Function Aj, a.

-FCV-63-3 SI Pump Mini-flow R37 1- CV-63-152 ECCS Recirc-1-F 153 ECCS Recirc 1-FC 63-22

. . .m ',\., ,,

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n..,_.. , . , _ _ . _

.3 .w

. ,m . , . . yu. M

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1-FCV-1-15 Stm Supply to Aux FWP turbine 1-FCV-1-16 Stm Supply to Aux FWP turbine

,e.,_,

s ,n. .,

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1-FCV-67-123 CSS Ht Ex Supply 1-FCV-67-125 CSS Ht Ex Supply 1-FCV-67-124 CSS Ht Ex Discharge 1-FCV-67-126 CSS Ht Ex Discharge ,.

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wiiww u. a w r i r

• ,..* . . . . . - _ . . +m 1 it "J  ?

.. it'.+.,.

. . ^ '- '

March 29, 1984 W SEQUOYAH - UNIT 1 3/4 8-36 Amendment No. 33

- - . ~ . - . . . .

. //nt/ l. Tdla 3.82 Ryl e ~ + Aa j 2 4

3 1-FCV-72-20 Cont. Spray Pumo Suction i 1-FCV-72-21 Cont. Spray Pump Su tion

, 1-FCV-72-22 Cont. Spray Pump Suetion.

1-FCV-72-23 Cont. Spray Pump Suction 1-FCV-72-40 RHR Cont. Spray Isol.

1-FCV-72-41 RHR Cont. Spray Isol.

1-FCV-74-1 Open for Normal Plant Coolcown

, 1-FCV-74-2 Open for Normal Plant Coolcown

, 1-FCV-74-3 ECCS Operation i- 1-FCV-74-21 ECCS Operation

~

i 1-FCV-74-33 ECCS Operation 1-FCV-74-35 ECCS Operation 5

i .

1 q

l i

O i

1 i

I s

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

,g,-,,- ,w . , . , , - . - . , . . . -,,.,,,,+w-.,, ,,-4 -er-e, , - - -- - - ---~,

O 1

_ TABLE 3.8-2 (Continued)

MOTOR OPERATED VALVES THERMAL OVERLOAD PROTECTION Valve No. . Function Ws..v, e,.,, ,, nc

-1 "C'.' 07- CC Y"V07Cl Cont. Ecl Lcacr p,a I Cont. hol. Lc er Ed T " ,07-100 Cont. hol L; ar i

,r 3.y m ,, ,m,,

.v r__.

,__, ._-.___ R37 TCV 7 CC Cc r. t . Ecl Lcaer

/e/e 1- TCV s._.e,.,,

b'\ ,ill Cc r,t . Ec1 Lcwcr

m. v, r.._._..... .._,

1-

., . rC V 07- . L7

_,_e., n, , Cer.t. hel Lete:r-v, . __. ,._, .___

_,_F,.,f

. . . rM, v

_,9,

.. ,.__A.. . . . .

~ _ , ..

. .ry .-

.v_

.,..m.

- ,. , , ,.v,, _ me .,n, , \ , . _ _ . ,._, ,e r c .-

...s. .v..

vers,- .

1- rCV 1 C?,

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/r

, r.._.._.. .. . . ~ .

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v, . . ,

\ ,.

.yr.

.myr. _ _ L-

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

. , s. v, ,.v

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1 FCV 07-207 gw. . . . vyf m .

.m .c ,.m.. , r, v,

,,n

.ve

" ant. ,__, hol U yper -

.L

~

,r,.,

. . he . .r , , .76

, ,,, LL..,...s.

ga v

.. . . ~ . .

n e v.

, /~,y p_

vyyw---.

TCV 2 CS Cc.,

.e., e, E c'. Upper-1-FCV-72-21 v,

-...\ ,.q..T

. .. ,,re-- ..-

Cont. Pay Pump Suction 1-FCV-72-22 Cont.

1-FCV-72-20 ray Pump Suction Cont. p ay Pump Suction 1-FCV-72-23 Cont Spr Pump Suction

...r,.,,

o.

,m w...y. og.

g .._,._,.-.

1-Fb-72-40 b Cont. p 1-FCV-72-41 ksol.

R Cont. Spra Isol.

O-flV- 70-/ # JffC3 llx 7~)r.

O -ft v- 20-/I# .rfM3 //,r 7%f//.

• 0-RV-?O j93* JWlJ 0-fCV-20 /9y JUr Isobdon ~~~ .

1. Jffdl f/sl .L a/e do p Ftv- )O -l 0 -FC V 9Y JCNS //A Tsolado-Affl3 flA TroLNo., ' '

l-fCV-2 -/5] AllR f gfg 3,44.,,,

J -FCV- ) -/ff f/M & Od4t ZJolab l-Rv 20-262 CDwE TAntfle .

p &y-70 .2 Ol cpwf .Tso4 ho~

0-fCV-20-203 CO W N I'#bS'

• o,.,,,,, /. M,4 /d March 29, 1984 EQUOYAH - UNIT 1 3/4 8-37 Amendment No. 33

o ,

@t3 TABLE 3.8-2 MOTOR OPERATED VALVES THERMAL OVERLOAD PROTECTION Valve No. Function

\ TCV C2 C2 !scletica far Scal Mater filter CV-62-138 Safe Shutdown Redundancy (CVCS) g 44 g.,,

k.jVC2-00 2 CCCC Cperct:00

/7, ,,,/ ,,j/ c R25 02-00 CCCC Operation 2 Tc C2-00 ECCS operatice wb 'N'<U 2ruh'h 2 FCV -01 Cl CCCC Operatica Cent. I5clatica g<p/ou,w d Af I

-2FCVC*b\'22 2 TCV- C CCCC Operation 2-rCV C2-k2 CCCC Operatien CCCC Cgenot.;e..

2LCVC21C(0 2 LCV C2-13 CCCC Operation 2-FCV-74-1 Open for Normal Pla Cooldpwn 2-FCV-74-2 Open for Normal P1 t Cooldown 2-FCV-74-3 ECCS Operation 2-FCV-74-21 ECCS Operation 2 FCV 74 12 R I "r' ci.s. Tump

-2 TCV 74 24 g :llR rump, iiini1ficw 3

!R TUmp, Trctcctctiin'f Tump ca 2-FCV-74-33 _ CS Operati 2-FCV-74-35 E S Operat'on 2-FCV-63-7 EC Operc ion 2-FCV-63-6 ECCS Oper} tion 2-FCV-63-156 ECCS 1 Path 2-FCV-63-157 ECCS F w Path rCV-03-30 BIT L.j tien 2 TCV CO 40 S!p!njc en

-2 TCV C3- 20 OI Injcct'en 2-ICV--00 20 SdInjectb-2-FCV-63-ll8 CS Pressure oundary 2-FCV-63-98 RCS Pressure undary 2-FCV-63-80 RCS Pressure Bo ndary 2-FCV-63-67 RCS Pressure Bou dary 2-FCV-63-1 ECCS Operation 2-FCV-63-72 ECCS Flow Path fro Cont. Sump 2-FCV-63-73 ECCS Flow Path from ont. Sump 2-FCV-63-8 ECCS Flow Path 2-FCV-63-1 ECCS Flow Path 2-FCV-C7- 3 ECCS Cooldown Flow Path 2-FCV-63-94 ECCS Cooldown Flow Path 2-FCV- -172 ECCS Flow Path 2-FCV 63-5 ECCS Flow Path 2-F 47 Train Isolation 2-F V-63-48 Train Isolation 2 CV-63-4 SI Pump Mini-flow

-FCV-63-175 SI Pump Mini-flow

,-),

March 29, 1984 SEQUOYAH - UNIT 2 3/4 8-34 Amendment No.25 l

r if,;} A Tafla 3. 8-2 /&pho ,o.J /*y /

5:n Sucoly c Aux Wo turcine 5 2-F V-1-15 2-FCV-1-16 Otm Su cly to Aux FWP turoine 1-R.V-/-l7 J'N fjyb Wo A"r W ~l",'d**"'

1-fC V-l -It J-Is , J ss/ */o A'ar fwp J,, 4, e ir 1 2- F V-62-13E' Safe Snutcown Recuncancy (CV 5) 2 F V-63-1 ECOS Operation 2 FCV-63-3 SI Pump Mini-flow 2 : V-63-4 SI Pump Mini-fiow l- :CV-63-5 E;;5 Flow Path 2-FCV-63-6 ECCS Operation 2-FCV-63-7 ECOS Operation 2-F;V-63-5 ECOS' Flow Path 2-F V-65-11 ECOS Flow Path 2- FCV-63-22 ECOS Flow Path 2- FCV-63-47 Train Isolation 2 FCV-63-48 7tain Isolation~

2- FCV-63-72 ECCS Flow Patn from Cont. Su=p 2- FCV-63-73 ECCS Flow Path from Cont. Su=3 2- FCV-63-S3 ECCS Cooldown Flow Path 2-F V-63-94 ECOS Coo.lcown Flow Path 2-FCV-63-152 ECCS Recirc 2-FCV-63-153 ECCS Recirc 2-FCV-63!156 ECOS Flow Path 2-FCV-63-157 ECCS Flow Path 2-ICV-63-172 ECOS Flow Path 2- F V-63-175 SI Pump Mini-flow

? :CV-57-123 CSS H: Ex Sur:1y

-:CV-67-124 055 H: Ex Disenaroe 2-FCV-67-125 CSS Ht Ex Su aly - -

2-FCV-67-126 CSS Ht Ei: Disenarce 2-FCV-67-146 CCwHi :_x' Tnro: line 0-FN-C?- 2cS

• D E!J Ad .D.L.% ~

C-Fcv-D-2:s

• T fid- Z,J 4 ~

0-r&V-20-/ " JffLJ //x Un.6/e c-fc v-70-//

• jffU t/n TN*T!l*

.1-Rv-70-/J.3 4#f & S,/4f .U.44-1-ft v -2 c-/J4 AHA An O.4ld Zuh%,

o-xv p-H3' SFPCJ 14/- Zeldis., .

o-fC V-70 -It*f SFPCJ ll.l, Z a h $.vn , _

D-Fcv-70-t97* JFPU fid Isolcho , -

o-kV 192

• JFP:s Mdr . dol '?.

D -RV 20l* (DwE rdsh A- fdV-70-2:7 CDWE %Wle Z - f V /0-1 0 f

• Lpwt . ~w(do s C o.,m., & i4.4 ' / - o( .2

.~

TABLE 3.8-2 (Continued) .

MOTOR OPERATED VALVES THERHAL OVERLOAD PROTECTION Valve No. Function

-FCV-63-3 SI Pump Mini-flow R25 2- CV-63-152 ECCS Recirc 2-F '-63-153 ECCS Recirc p, /, /. tod,. /!/*

2-FC

- --m 3-22 ECCS Recirc n..:_< v._,-..,__

g ,.'/'/u, afg

& . u iu.

- e m., _ ,q, _ ,

o yo.mm n._o y .mm r s,

. v_ o_ :o_3_

r , _ , 4.

. ~ . - - . . .

v_,,.,-..

.w. .....

a gg gse fy,,,,,,

,_ree,_,_v,\

& , w s n n. : _ t wu,wn r , _

o,.

.T._,_.

n_3,__,_ :__sv.--.v..

fyy n em, ,_,nn n..:,. e,__

2-FCV-5-15 StmSuppiykokux'FhPUurbine 2-FCV-1-16 Stm Supply to Aux FWP turbine

, _ r eu _ , _ , , c. a enro e... c..__,.. ._ n..__

& sus a s a Jn unun aj a wuyy ij mv . umy 2 FC" 3-170S ERC" Sys Supply te emp J -r y-/-n JV,., yJpf d & N -/, h-<

2 TC',' 3 1 3CA '" C' Sy5 Supply to "u:.p .2 - w -l-/P J/,., Jyph -Jo dur fd -A k~e

- -~,

& a u.

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n..__

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& 3 6V W I 3Wn wwyy ng ww D.nmn wmy

, reo ,_,,em 6.t w1 rn- sy s

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6 3 kW W 5 GVW 6HWM JJ J WWyy DJ -V s wuruy a eme_,_,,en e n et t h... e..__,. ..

& 5 kW ,W A&vn knbn w wyy ig ww o. w. my. o _

e_rru_,_,nen

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& 5 by ,U IWW . G U B U b 5 Wil 4V5__ nbi W4 4 WMV3G4 G U l i 3E I III W -

e ret ,_ ,n ,,n ,__,_A

• w__ nen n*, P__, _ -- O TL_ -_n

~

& 6 kW ,V 4WJ .DW3GblW46 h B nwr W[5 bwW I C I J U l ilC 6 581 W

-FC" 70--4 Nca mss ntici Locds - r??

2-fC"70-143 Isciaticafh'l?ss-LetdeunHtXchgr Isolatica fc x-In ' q- ; ,}

+ ru-o, ,no 26n, r

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TABLE 3.8-2 (Continued)

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,,,,,,,,, /, ' N .Ye / + 2-March 29, 1984 SEQUOYAH - UNIT 2 3/4 8-36 Amendment No. 25

ENCLOSURE 2

" PROPOSED TECHNICAL SPECIFICATION CHANGE SEQUOYAH NUCLEAR PLANT UNITS 1 AND 2 DOCKET NOS. 50-327 AND 50-328 (TVA-SQN-TS-87-29)

DESCRIPTION AND JUSTIFICATION FOR REVISION OF TABLE 3.8-2 (UNITS 1 AND 2) 0F THE TECHNICAL SPECIFICATIONS e

C1

ENCLOSURE 2 Description of Change The proposed change revises table 3.8-2 (units 1 and 2) of the technical specifications to delete the references to active motor-operated valves (MOVs)

- which will have their thermal overload (TOL) protection devices bypassed. In addition, MOVs which are no longer active, because of 10 CFR 50 Appendix R considerations or because their movement is not required for safety, are also deleted. Several active MOVs which were previously omitted are added to the table. A typographical error in the unit 1 table is also corrected. The table is also reordered by system and valve number.

Reason for Change Significant Condition Report (SCR) SQN EEB 86167 R1 and Condition Adverse to Quality Report (CAQR) SQT870102 identified that previous design calculations had not accounted for the impedance of the TOL protection devices when determining terminal voltages for MOVs. When the TOL impedance is accounted for, the terminal voltage requirements for some MOVs could not be met during certain voltage transients. This condition is most significant for MOVs that must stroke during the first few seconds of an accident because this is when the voltage transient is most severe. The voltage transient stabilizes after a few seconds, eliminating the terminal voltage problem for MOVs which stroke later in the accident. TVA has performed specific analyses to identify when MOVs are required to operate. the MOVs that operate during the transient will have the TOLs bypassed. The MOVs that operate after this time will remain in technical specification table 3.8-2.

The corrective action to be implemented by Engineering Change Notice (ECN) 6883 is to install bypasses around the TOL protection devices for the MOVs with terminal voltage problems. These MOVs are listed in attachment 1.

Since the bypass increases the short circuit fault current of the MOV circuit, ECN 6883 replaces some of the circuit breakers for circuits with bypassed TOL devices. This ensures proper electrical system protection from faults. The proposed change to the technical specifications reflects that some of the MOV TOL devices are now bypassed. It also corrects the list to account for valves that have had status changes. Valves that are no longer considered active valves are removed. Valves that are active but not included in the table are added. The order of the valves is changed to provide clarity and to provide human factoring for the operator.

Justification for Change Regulatory Guide (RG) 1.106, " Thermal Overload Protection for Electric Motors on Motor-Operated Valves," allows the TOL devices to be bypassed. Regulatory Position 1.a states that ". . . the thermal overload protection devices should be continuously bypassed and temporarily placed in force only when the valve motors are undergoing periodic or maintenance testing . . . ." It is the TVA position, however, that it is not necessary to place the TOL devices in force during periodic or maintenance testing. Instead, periodic diagnostic testing will be conducted to identify potential valve degradation.

_ _ _ . _ _ _ _ . _ . . _ _ . _ _ _ - _ __ - _ . _ . . ~ . . . - _ _ _ _ _ _ . . ~ . . ._ _. _

i i * .

i Placing the TOL devices in force during testing is intended to provide valve i

motor protection and to serve as a crude diagnostic . indicator for MOV degradation. . The TOL devices currently used are set to trip the MOV under j sustained locked rotor conditions. This is an indication of failure, not j

• degradation. It is the TVA position that other testing methods can be used to I detect MOV degradation instead of relying on the TOL devices. This would

satisfy the intent of RG 1.106. .,

1 l ECM 6883 will bypass the TOL device for the valves listed in attachment 1.

j These valves are required to stroke during the first few seconds of an accident. It'is during this period that the voltage transient is significant, j! causing the MOV terminal voltage problem. For these valves, TVA intends to y utilize the Motor-operated Valve Analysis and Test System (MOVATS) to detect l MOV degradation. Each of these valves will be tested with MOVATS at least

once every 18 months and af ter major valve maintenance. This test frequency is consistent with our conunitment to MOVATS testing in our response to IE j Bulletin (IEB) 85-03. The required ASME Section II stroke time testing l performed during operation will identify significant valve and operator i

degradation between the MOVATC testing. The MOVATS testing will be controlled by established administrative controls at the plant. The use of MOVATS is j becoming an industry standard for detecting MOV degradation and is much more

sensitive and reliable than the TOLs.

MOVAIS is a method of obtaining signatures of relative stem thrust, control

switch actuation, and motor current for MOVs. This information can be used to 1 detect MOV degradation. More information on MOVATS is included in the

! enclosed ASME report and the NRC Office of Analysis and Evaluation of Operational Data (AEOD) case study report, i

j To ensure the ability to detect current imbalances and single phasing in the MOV operators, preventive maintenance (PM) programs are under development as part of the 10 CFR 50.49 Environmental Qualification (EQ) Program, which j measures the drawn current in all three phases. TVA has previously conunitted to implement the PM procedures by the end of the unit 2 cycle'3 refueling outage. Similar PM procedures will be developed for the non-EQ MOVs which have their TOL devices bypassed.

The MOVs listed in attachment 2 are removed from the technical specification table because of 10 CFR 50 Appendix R configurations. These may be removed j since power is verified removed from these MOVs once every 28 days; therefore,  ;

d the MOVs are no longer considered active valves. The MOVs listed in <

! attachment 3 are removed because their movement is not required for safety,  !

and they are no longer considered active. The MOVs it. attachment 4 are added ,

i to the table to reflect all active MOVs which have TOL devices in force. )

These valves were omitted from the original technical specification.

1 j The reordering of the table is based on human factoring. Listing the MOVs by

system and valve number reduces the possibility of operator error.

I The referenced information on MOVATS'is provided in enclosure 4.

I 4

l

}

ENCLOSURE 3

^

SIGNIFICANT HAZARDS CONSIDERATIONS 4

, . 1. Is the probability of an occurrence or the consequences of an accident j previously evaluated in the safety analysis report significantly l increased? , _

No. The intent of Regulatory Guide (RG).1.106, "Tnermal Overload Protection for Electric Motors on Motor-Operated Valves," is to ensure that the motor-operated valve (NOV) performs its intended function under

accident conditions and that some protection against MOV degradation is provided during normal operations. As stated in Regulatory Position 1.a,

+

continuously bypassing the thermal overload (TOL) device is an acceptable method of ensuring that the MOV performs-its. safety function. NOV

'- degradation can be detected through the use of Motor-Operated Valve 3

Analysis and Testing System (MOVATS) and'the preventive maintenance (PM) programs under development. MOVATS, PMs, and ASME Section II testing will ensure that the probability of MOV failures (motor-operator or j valve) is not increased. The intent of RG 1.106 is satisfied. NOVATS

testing is significantly more reliable as a tool for detecting MOV degradation than are TOL devices. The changes to the table are made to i reflect the active MOVs with TOL devices in force. As such, there is a ,

decrease in the probability of occurrence or the consequences of an.

j accident previously evaluated in the safety analysis report because of the increase in MOV reliability.

! 2. Is the possibility for an accident of a new or different type than i evaluated previously in the safety analysis report created?

No. The continuous bypassing of the TOL devices and the MOVATS testing

and PM programs are simply an alternative method for meeting the intent l of RG 1.106. The possibility of MOV failure, either motor-operator or valve, is not created by removal of the TOL devices because of the known j ,

sensitivities of the TOL devices. -Component operation will remain-the 1 same in terms of its intended function. The deletions and changes to the

! table are made to reflect the active MOVs with TOL devices in force, j Therefore, the changes do not create the possibility for an accident of a new or different type than evaluated previously in the safety analysis report.

l

]

3. Is the margin of safety significantly reduced?

i j No. The bypass of the TOL device is to ensure that the MOVs will perform j their intended function under accident conditions. Also, testing is performed to identify MOV degradation, meeting the intent of RG 1.106;

and MOVATS testing is more sensitive for detecting MOV degradation than j are the TOL devices. This results in higher MOV reliability. The i changes to the table are made to reflect the active MOVs with TOL devices in force. Thus, there is an increase in the margin of safety because of i

the higher MOV reliability.

t 4

I -- .._ _ __- m,.._ _ - , _ , , . . . - , . , _ . . . , _ _ - _ . _ _ _ . _ . , . _ _ . _ _ . _ . _ . . _ _ _ . . . ~ _ . . . ___. _ - , _ . . _ . . _ _

4 a - z.- a ENCLOSURE 4 -

PROPOSED TECHNICAL SPECIFICATION CHANGE SEQUOYAH NUCLEAR PLANT UNITS 1 AND 2 DOCKET NOS. 50-327 AND 50-328 _

l (TVA-SQN-TS-87-29)

REFERENCED INFORMATION ON THE MOTOR-OPERATED VALVE ANALYSIS AND TEST SYSTEM

-(MOVATS) i 4

4 i

1 i

l l I

I l - - . -- .- . . _ -