ML20058E195

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Proposed Tech Specs Re Electrical Equipment Protective Devices
ML20058E195
Person / Time
Site: Summer South Carolina Electric & Gas Company icon.png
Issue date: 10/26/1990
From:
SOUTH CAROLINA ELECTRIC & GAS CO.
To:
Shared Package
ML20058E193 List:
References
NUDOCS 9011070068
Download: ML20058E195 (17)
v • d • e


Text

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o ATTACHMENT 1

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i Attachment I contains marked-up Technical Specification pages.

The proposed change deletes surveillance requirement 4.8.4.2.a.1 because it is not i

applicable to the Virgli C. Summer Nuclear Station since there are no thermal 2 overload, devices which are' continuously bypassed.

This change also combines

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- the surveillpnce requirements of sections 4.8.4.2.b.1' and 4.8.4.2.b~ 2 since i

section 4.8.4.2.b.2 alone is not applicable as stated.. This combination of surveillance-requirements will require stroke. testing of the 38 motor t operated ' valves.'with overloads which are not bypassed as identified in Table i

3.8-2.

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-9011070068 901026 6l<

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ELECTRICAL POWER SYSTEMS MOTOR OPERATE 0 VALVES THERMAL OVERLOAD PROTECTION ANO 8YPASS DEVICES LIMITING CONDITION FOR OPERATION 1

3.8.4.2 The thermal overload protection and bypass devices, integral with the motor starter, of each valve listed in Table -3.8 2 shall be OPERA 8LE.

APPLICA81LITY: Whenever the actor operated valve is required to be OPERABLE.

ACTION:

With one or more of the thermal overload protection and/or bypass devices inoperable, declare the affected valve (s) inoperable and apply the appropriate ACTION Statement (s) for the affected~ valve (s).

SURVE!LLANCE REQUIREMENTS 4.8.4.2 The above required thermal overload protection and bypass devices shall be demonstrated OPERABLE:.

-a.

At'le t once per.18 months, by the perfomance of TRIP ACTUATING I DEVICE RATIONAL TEST of-the bypass circuitry those thema1 g

. overload vices which are,either:

1.-

Contin ly bypassed:and temporarily aced in force only when-tt the valve tors are' undergoing peri s

or ic or maintenance testing, J

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' 2. - Normally in;f 1

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4 during plant ration and bypassed under

. accident condit

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LAt least once per 18Eno hs by' perfomance' of a CHANNEL

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CALIBRATION.of a represe ti sample of at least'255 of:-

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1.

All thermal overload ces which are not bypassed, such that-each.non-tr/ passe (

ice calibrated at least.once per 6 years..

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- 2.

All thermal over edijevice ich are' continuously. bypassed and-t L.E temporarily p1 ed in force o when the. valve actors aret R

mndergoing p. iodic or mainte e testing,- and thermal: overload-s devices no 11y in force and b sed under accident conditions-i such tha' each themal overload 1 alibrated.and each valve.is:

1 cycled troughiat:1eastione comple cycle of full. travel with-t the r, operator when the thermal erload is 0PERA8LE and not b

ssed,Lat'least once per 6 years.'

SUM ER - UNIT 1 3/4 8-18 Amendment No. 63 o

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/ $$URVElllANCE-REQUIREMENTS 4 l

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4.8.4.2. The above required thermal overload protection and bypass devices L

.f shall be demonstrated OPERABLE:'

a.

At.least once per 18 months by the performance of a TRIP ACTUATING DEVICE OPERATIONAL TEST of the ~ bypass circuitry for those thermal overload devices which are normally in force during plant operation e,;. ;,

and bypass under accident conditions.

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b.

At -least once per 18. months by the performance of a CHANNEL l

CAllBRATION of a. representative; sample of at least 25% of the MOV's' l

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m with required safety functions such that each thermal overload is y %" F calibrated : and each valve is cycled through at least one complete

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cycle of. full travel. with the~ motor operator 'when the thermal-i,, %,, 4; overload is OPERABLE and not bypassed, at least once per 6 years.

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ATTACHMLWT 2

. Attachment 2 contains marked-up Technical Specification pages for Table 3.8-T 2.--

Two valves were deleted from Table 3.8-2 and twelve were added (as noted). The table was also rearranged'in alphanumeric order, and ten valve

}

designations were updated as listed below. The valve functions of the M0V's

. listed were also= updated to agree with the site computer system listing.

Old Valve Number New Valve Number Reason for Chanae XVG0115B-CS.

.LCV0115B-CS..

s.,

Valve is a.. level control. valve.

!XVG0115C-CS LCV0115C-CS~

Valve is a' level control' valve.

XVG01150-CS LCV01150-CS Valve is'a level control valve.

3

'XVG0115E-CS LCV0115E-CS.

Valve is.a level control valve.

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. XVT0602A-RH FCV0602A-RH LValve is a flow control valve.

1XVT06028-RH-

.FCV0602B-RH

' Valve-isLa flow control valve.

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FCV8701A-Rii XVG8701A-RH

-Valve'is a gate valve.

LFCV8701B-RH' XVG8701B-RH Valve.is a gate valve.

i FCV8702A-RH XVG8702A-RH Valve is a gate valve.

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FCV8702B-RH.

XVGB7028.RH~

Valve is a gate: valve, o

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Table 3,8-2 Motor Operated Valves Thermal' Overloads Protection and/or Bypass Devices-w s

Bypass Devices Valve #

Function y,

n3 FCV0602A-RH RHR Pump A Miniflow Valve No

.L FCV06028-RH.

RHR Pump B Miniflow Valve No J

LCV01158-CS CHG Pump A Suction HDR RWST ISOL VLV Yes l

Y

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LCV0115C-CS

. Volume Control Tank Outlet ISOL Valve Yes

LCV01150-CS.

CHG Pump B Suction HDR RWST ISOL VLV Yes

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LCV0115E-CS Volume Control. Tank Outlet ISOL Valve Yes t

XVB3106A-SW SW Booster Pump A Discharge Valve Yes

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,m XVB31068-SW'

'SW Booster Pump B DischargeLValve Yes m

1

' yi-M i 1.XVB3110A-SW:

'RBCU:1A &L2A.IC SYS Supply ISOL Valve Yes s

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XVB31108-SW:

RBCO: 18 & 28-IC-SYS Supply ISOL Valve

.Yes b,,,

.XVB3126A-SWJJ xHVAC Chi.11er, Condenser A.SW Supply VLV

-No H

.N

'XVB31268-SW LHVAC-' Chiller Condenser B SW Supply-VLV No c'ip m 4

c ' 4:P XVB3128A-SW HVAC Chiller Cond C SW: HOR A IN ISOL VLV No w

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XVB3128C-SW.

HVAC ChillerLCond C.SW HDR B IN.ISOL VLV No X

XVB9503A-CC' RHR-HX-A CC' Inlet Valvel No

. 'XVB9503B-CC -

.RHR HX B CC Inlet Valve No J

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.XVG1001A-EF.

'MTR DR EF Pump)A SW!A~SUCT XCON'N VLV Yes

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XVG1001B'-EF l

-MTRDRIEFPumpB)SWLAiSUCTXCONNVLVT Yes-Mic h..

<XVG1002-EF TURB DR-EF Pump SW B..SUCT XCONN VLV

'Yes mh'

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MM XVG1008;EF-

.TURB DR EF Pump SW A SUCT XCONN VLV Yes:

n R.

XVG1037A-EF

..EF Service Water HDR A'XCONN ISOL,VLV Yes XVG10378-EF'

'EF Service Water: HOR B:XCONN ISOL VLV-Yes-

[

A XVG2802A-MS MS Header lB EF Pump Turbine Supply VLV Yes h'

XVG2802B;MS--

MSHeaderC-EEPumpTurbineSupplyVLV Yes I

.XVG3001A-SP RB Spray:PP A RWST Suction HDR1VLV.

Yes-XVG3001BASP RB Spray PP B RWST Suction HDR:VLV Yes 3

XVG3002A-SP-NA0H 'HDR A Supply ISOL Valve Yes.

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Table 3.8-2 (Cont.)

-Motor Operated Valves Thermal Overloads Protection and/or Bypass Devices Valvel.

Function BYDass Devices y;

e XVG30028-SP

.NA0H HDR B Supply ISOL Valve Yes XVG3003A'-SP RB Spray Header A Supply Valve (ORC)

Yes XVG30038-SP-RB Spray Header B Supply Valve (ORC)

Yes.

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XVG3004A-SP RB Spray Sump ISOL Valve A (IRC)

Yes.

-XVG30048-SP:

RB Spray Sump'ISOL Valvo B (IRC)

Yes 4

XVG3005A-SP RB Spray; Sump.ISOL Valve A (0RC)

Yes XVG30058-SP'

.RBShray.SumpISOLValveB(ORC)

Yes XVG3103A-SW:

RBCU 1A & 2A Return Header ISOL VLV No 3

e XVG31038-SW RBCU 1B & 28 Return Header ISOL VLV No j

U (XVG3107A-SW-SW Pond-RBCU 1A&2A' Return ISOL VLV,

-Yes-

.-XVG31078-SWE ;SW; Pond RBCU;.1B&28.. Return.ISOL VLV-

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XVG3108A-SWl RB Cooling: Unit 1A. Inlet lSOL VLV-Yes f

JXVG31088-SW

'RB Cooling Unit 2A_ Inlet ISOL VLV

-Yes g

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XVG3108C-SW;

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RBCdo1{n'1Onit1BInletISOLVLV Yes.

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XVG3'108DLSWD 1RBl Cooling' Unit 2B Inlet-ISOL~VLV Yes:

I XVG3109AySW,' RB Cooling; Unit 1AL0utlet;ISOL VLVl

.Yes

((

-XVG3109B SW

RBCoolingU' nit!2AOOt1'htISOLVLV Yes i

a RB'Co'oling"Onit18OutletISOLVLV Yes J

f XVG3109C-SW 4

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XVG31090-SWl RB Cooling Unit 2B 0utlet ISOL VLV-

-Yes

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XVG3111A'SW.

RBCU 1 &2Ai]CESYS Ret' urn ISOL VLVf Yes:

3 XVG3111B-SW:

RBCU IB&28-IC SYS Return ISOL VLV-Yes' XVG3112A-SWL RBCU1A&2AI1CSYSReturn'VLV Yes XVG31128-SW.

RBCO 18&2B-IC SYS' Return VLV

~Yes

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XVG6516-VU:

-CC. Pump'AjMotorCoolerVU'OutletISOLVLV.

No XVG6!,17-VUJ CC Pump C; Motor Cooler VU ALT Out ISOL VLV

'No L

4:i XVG6518-VU CC Pump C: Motor Cooler VU ALT'Out ISOL VLV No

-XVG6519-VU:

CC Pump B Hotor Cooler VU Outlet ISOL VLV No

..XVG6797-FS Fire Service Containment Isol. Valve

.Yes l

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1 Table 3.8-2 (Cont.1

-Motor Operated Valves Thermal Overloads Protection and/or Bypass Ogvices i

y.

4 Bypass Devices L'

Valve #;

Function 11.!!

XVG7501-AC AC Supply Header Containment Isol. Valve Yes

XVG7502-AC_

AC Supply Header Containment 1s01. Valve Yes c

.XVG7503-AC, AC. Return Header Containment Isol. Valve Yes

XVG7504-AC AC Return Header Containment Isol. Valve Yes

- XVG8106-CS Charging Pump Miniflow Header ISOL Valve No Y

XVG8107-CS-

- Charging Pump Discharge Header ISOL Valve Yes 4

XVG8108-CS:

Charging Pump Discharge Header ISOL Valve Yes

'XVG8130A-CS l Charging Pump A.to.C SUCT XCONN VLV-No m

"XVG81308-CS-Charging Pump A to C SUCT XCONN VLV No y-

XVG8131A-CS Charging Pump B'to_C SUCT XCONH VLV No 3

hg oXVG8131B-CSi Charging Pump B,to:C.SUCT.XCONN VLV-

>No A

XVG8132A-CS

. Charging Pump A to C~ DISC 3 XCONN VLV.

No wm u

XVG81328-CSL Ch'arging Pump A to C DISCH XCONN VLV No nZ m

XVG0133A-CS:

Charging. Dump B to C DISCH XCONN:VLV Ho

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XVG81338-CS.

Charging Pump B to CLDISCH XCONN VLV

'No i f c3,

'XVG8701A-RH:

RBiHeaderAIS0LValve(IRC)

,Yes au Ly w

>XVG8701B-RH;

'RB Header B ISOL Valve'(IRC)

Lyes

@@ O XVG8702A-RH__

RH'161et Header, A ISOL-Valve:

Yes

?,y:

y, oA XVG8702B-RH:

'RH Inlet Header B'ISOLuValve

Yes N

XVG8706A-RH-CHG/SI PumpiSUCT41DR Rh'HDR A' Inlet VLV

-No m'4 XVG87068-RH; CHG/SI Pump SUCT:HDR RH HDR Bl Inlet VLV:

-No N

XVG8801A-SI

'HIfHead Injection _ Valve.

Yesc gpr n

M XVG88018-SI' HI Head Injection Valve' Yes XVG8808A-S1 SI AccumulatorJA Discharge Header. Valve Yes-m f,

'XVG88088-SI-

'SI, Accumulator;B Discharge Haader. Valve-L Yt:s

XVG8808C-SI SI Accumulator l CLDischdrge Header Valve

.Yes-XVG8809A-SI:-

Refuel WTR STGLTK RH Pump A SUCT VLV-

'No XVG8809B-SI

-Refuel WTR'STG TK RH Pump A SUCT~VLV Ho y

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Table 3.8-2 (Cont.)

Motor Operated Valves Thermal-Overloads Protection and/or Bypass Devices Bypass Devices Valve #

Function XlN.

XVG8811A-SI CNTMT Sump RH Pump A SUCT ISOL~VLV Yes XVG88118-SI CNTMT Sump RH Pump B SUCT ISOL VLV Yes XVG8812A-SI RH Pump A Suction HDR VLV Yes XVG88128-SI RH Pump B Suction HDR VLV Yes XVG8884-SI High Head to Hot Leg Inj. Header ISOL VLV No XVG8885-SI High Head to Cold Leg inj. Header ISOL VLV No 4+

XVG8886-SI High Head to' Hot' Leg inj. Header ISOL VLV No XVG8887A-SI

-Low Head Inj. HDR A XCONN Valve No

'XVG88878-St.

Low Head Inj. HDR-B XCONN Valve Ho' XVG8888A-S1 Cold Leg injection Header ISOL Valve No LXVG88888-SI, Cold Leg-Injection. Header.1 SOL Valve No j

iXVG8889-SI Hot LegLinjection Header'ISOL Valve No

+

h XVG9568-CC-Excess LlDH'HX Inlet:CC HDR ISOL Valve Yes W

, XVG9600-CC RB CC Supply Header ISOL Valve Yes w N ' XVG9605-CCL DRB CC Return-Hdader ISOLEV'alve-Yes-i y(,m ~

w (XVG9606-CC.

RB CC. Return Header ISOL Valve-

-Yes

-1 s

O XVK1633A-FW STM GEN A CHEM ' Feed HDR^1 SOL' Valve'

-Yes;

- r

,yl iM XVK16338-FW STM GEN B CHEM Feed'HDRIISOL, Valve-

-Yes 3

1 ibs "" % XyK1633C-FW-STM GEN C CHEM Feed HDR ISOL Valve Yes

' XVT2813-MS L EF Pump TURB-Steam Supply HDR Drain VLV Yes i

RXVT8100-CS.

RC-Pump.SealReturnHDRlSOLValve(0RC)?

Yes l

JfXVT8109A-CS-l Charging Pump A Miniflow ISOL. Valve:

-No' f

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$l9 A t XVT8109B-CS Charging' Pump B Miniflow-ISOL Valve No 4 rXVT8109C-CSL Charging Pump C Miniflow ISOL Valve.

.No 4@

hXVT8112-CS RCPumpSeal1ReturnHDRISOLValve.(IRC)

Yes' j

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u ATTACHMENT 3 J

- Attachment 3 contains a description of the amendment request and supporting

' safety evaluation.

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, Attachment 3 to Document Control Desk Letter s

' w October 26, 1990:

'Page 1-t

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SAFETY EVALVATION FOR VIRGIL C. SUMMER NUCLEAR STATION F

Description of Amendment Request;

)

1 Technical - Specification 3/4.8.4.2 addresses motor ~ operated valves (MOV's)

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thermal overload and bypass devices.

The inten'. of the surveillance tests in-Ethis technicalL specification.is to assure ;he operability of the M0V's ithermal; overload protection and/or bypass devices.

The operability of these devices. ensures that_ they = will not prevent _ Nhe MOV's from performing their safetyL functions ' during accident conditions. - The table listing these M0V's,

+

Table-3.8-2, will be rearranged in alphanumeric' order to _ improve the ease in which' the table: can be used and ten valve designations will be updated _as I

-listed in Attachment 2.

The valve functions. listed in this table will be 0

cupdated to agree with the' site-computer system listing also.

Item 4.8.4.2 of sJ the1 Technical / Specification is~. being revised to reflect the actual type of:

l

. bypass circuitry; used on theamotor operated valves -in : Table; 3.8-2.

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valves: have circuitry normally -in force:during plant-operations. and : bypassed

'6 under: accident conditions.

Continuously bypassed circuitry, as referenced in'

,+

sexisting. Technical Specifications, does,not; exist-at this plant.

LTworvalves will be deleLed from Table 3.8-2. LThese' valves (XVG-8803A41 and

.;XVG-88038-SI) were: removed..during Refueling Outage #2 with the removal of the j

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. boron Linjection tank and. are no' longer, subject- ;to _ testing requirements.

l

'There1will also be twelveJvalves added to LTable 3.8-2.

_- Four valves (XVG-;

my'

7501, 2,

3, 4-AC)aare needed for icontainment isolation and shoul11-have j

initially been ~ included in ? Table: 3.~8-2.

Testing of these fvalves was j

s; 3 *..

previously covered under plant procedures.

They were last. tested'. Apr il 14,

>qq3

1987: and May :8.1987.

These-valves will now be=added toithe listing cf Table.

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' ;3.8-26 so.as to assure their testing for correcti response under manual 1

operating conditions.

An: additional eight1 valves (XVB-3126A & B-SW.LXVB-3128

. N

~A&C-SWLand XVG-6516 '17, 18 and?19-VU). are' also to: be e added to Table 3.8-2.

l 2*v f They.were previously.cmltted because o they - are non-bypassed valves.

These l

~

i 7valveskare' auxillary support devicesisince theyJare _ required to ~ automatically-W

open and Close dependlog _-upon whether their.. associated equipment. is running.

'orfnot. :They are, therefore, subject to the requirements of' Reg._ Guide 1.106

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.which is the basis:for this specification.,

i lThe final / proposed change: combines the survel_lla'n'ce requirements. of sections j

4.8.4.2.b.a cand 4.8.4.2.b'.2..

This combination =of surveillance. requirements i

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' ' finvolves : stroke ' testing L thirty-eight motorioperated valves listed in Table 1

M "3.8-2 wnose overloads are not. bypassed.. Adding surveillance requirements to q

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.these thirty-eight motor operated valves will make the testing of bypassed ly"y w, and non-bypassed M0V's consistent.

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y e-1 f~'" to Document Control Desk Letter 10ctober 26,'_1990 Page 2'

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Safety Evaluation:

I The changes made to section 4.8.4.2 of Technical Specification 3/4.8.4 are l proposed--to ' delete surveillance requirements for continuously bypassed F

circuitry :since this design: alternative is not used at Virgil C.

Summer Nuclear Station.. This change in no way affects the intent of the 3

- surveillance requirements in place for testing bypass circuitry and will

?

  • therefore. maintain the: margin of plant safety as described in the bases of

. the. technical ' specifications.

These tests are used to resolve -concerns of thermal overloads ! interfering with the operation of M0V's-during accident:

ml conditions, j

$ JThe. rearranging of Table 3.8-2'into. alphanumeric order is proposed to improve

.the ease in which the~ table _can be used and has no impact on plant operation orc safetye The updating of-valve designations has no safety impact either y

since these valves.will still be subject to testing and no physical change to

. the, plant shas' beeni made. - Making : the valve function listing agree with. the:

,V

' site; computermlisting is ~ proposed to make the references consistent. - This.

change is purelyLeditorial and has no safety impact.

't

The addition _ Jof f twelve' valves-- to the' surveillance ~ requirements,. provides

. assurance ; thate they :will ( perform uncer accident conditions.

, Fou'r of the Ltwelvelvalves-(XVG 7501', 2, 3, 4-AC) are needed for containment-isolation and.

k should: have: been Linitially included.

-(These valves were previously tested

  • undertplant' procedures.for. correct electrical operation.)

These four valves iwill:beiadded tolthe' listing of Table:3.8-2 so as to' assure their; testing for

. correct ? response nunder manual operating conditions.

The additional eight -

1 Lyalv.es a (XVB-31261 A&B-SW. XVB-3128A&C-SW and XVG-6516.17, = '18.- & 19-VU) are -

added: becauset they' are considered auxiliary -support devices. and are subject 7toithe requirements-of R;G.1.106 (the basis for,T.S.3 3/4.8.4).

These: eight o

7valVesV aret required) to;Lautomatically. open_-andL.close dependir49 on 'the V

operatlon, of.'theirJassociated 1 equipment.

Imposing 1 additional _ surveillance irequirements on.:the Etwelve ' valves; mentioned above will ' provide Egreater;'

i assurancei as to. their, proper. operation under accident conditions. -

s

Thelideledon fof. two valves (XVG-8803A & B-SI) from Table 3.8-2 is due to the lremoValWofEthe'._bor_on ' injection, tank during Refueling ' Outage' 12.:.

The i

.evaluatiori:and approval Lfor removal. of ' these M0V's z along with' the ' tank was f

controlled under the plant's' modification program.

And since these M0V's are a

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no 71ongerd a part of; the ' plant system, they no longern affect the safety Lifunctionsjofthe' plant?

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m 5Lastlyksurveillance requ'trements 4.8.4.2.b.1 and 4.8.4.2.b 2 ~ were combined-

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i toWncorporate thef testing;of -thirty-eight MOV's' whose overloads are not

, bypassed;(astlist.ed.on Table'3.8-2)'as well as those with overloads bypassed.

ThisJcon.binationawlli add assurance that these valves will operate properly

,4 under. accident conditions.

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' Attachment 3 to-Document Control Desk Letter

0ctober 26.11990

- j Page 3--

-Pursuant: to= the; above information, the proposed Technical Specification change does not involve a reduction in the margin of safety since the changes do: not 'have an adverse impact on containment integrity,

systems, or

. components important to safety or any other design feature.

There is also no

.unreviewed safety questlon involved in this Technical Specification change.

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ATTAU MENT 4

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! ' con'tains a description of the amendment. request and associated no' significant hazards evaluation.

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I Ai!tachment 4 of Document Control-Desk Letter

  • l October 26[1990

.i Page 1 S

i Description of Amendment Request:

L 1 Technical Specification 3/4.8.4.2. addresses motor operated valves (MOV's) thermal overload and bypass devices.

The intent of the surveillance tests in this technical specification-is to assure the operability of the MOV's i

thermal overloadi protectlon ~ and/or bypass devices.

The operability of these

' devices ensures-that they will not prevent the. M0V's from performing,their i

safety functions during accident conditions. ' The table. listing these M0V's, Table 3.8-2, will be rearranged in alphanumeric order to improve the ease in which - the table can be used and ten valve s designations' will be updated as

-listed: in Attachment 2.. -The valve functions listed -in this table will' be updated to agree =with the: site computer system listing also.. item 4.8.4.2 of theLTechnical'Jpecification = is' being revised to. reflect the actual type 'of bypass circuitry f used.on. t'es motor operated valves in Table 3.8-2.'--

These valves. have circuitry normally. in force during plant; operations..and bypassed

under; accident. conditions... Continuously. bypassed circuitry, as referenced'ini g

sthe existing Technical. Specifications, does not exist.at this. plant..

Twot valves w111 thel.deletedEfromlTable.3.8-2._ Theseevalves-(XVG-8803A-S1 and-c l " "* "

XVG-8803B-SI) were removed during Refueling Outage.#2 with the removal:of-the-boronCinjection tank, and are, no longer subject 1.to testing 1 requirements, a

There will -also be ? twelve valves added: to Table 3.8-2.

fourn valves - (XVG- ~

7 17501,'32,L3, 4-AC) are needed for containment' isolation and' should have q

initiallyL been included in Table 3.8-2.

Testing,of these valves was.

previouslyLcovered under plant procedures.

They 'were' last tested: April -14, i

L1987Eand' Map 8,c1987. These valves will;nowfoe added to the listing of Table'.

13.8-2f so fas f to Jassure' their. " testing for-'~ correct' response -under manual-Loperatingoconditions,. Anl additional eight valves?(XVB-3126;A&B-SW,1XVB-3128 A&C-SW L and i XVG-6516, 17, 18 : & 19-VU). are also ~ to ;be added. to' Table 3.8-2..

' 1They Twer'ef previously ;omitted ' because they ; are. non-bypassed avalves.

'These u

< valves lare: auxiliary support devices ~since th'ey are'requiredito; automatically.

opencandl close Pdependingcupon whether - their. ' associated equipmentJ is ' running; corinot..They"are,;therefore, subject to the r.equirements of-Reg 6 Guide 1.106'

, ~

whichlis'theLbasis for.this specification..

1

,e 0; o n

Thelfinalf propo~ sed change combines the f sur'veillance. requirements :of sections 4.8.4.2.b'1Dand: 4'8.4>2.b.2.. This combination' of; surveillance requirements g = involves strokeitesting thirty-eight motor: operated valves ' listed in Table 13;8-2Ewhose. overloads are not bypassed.

Adding' surveillance requirements 1to 4

y' thesell thirty-eight motor' operated valves
,will: make the'. testing of the-
bypassed andinon-bypassed M0V's consistent.-

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F r, cf Document Control Desk letter i

October 26, 1990 y+

Page 2 y.

A T

Basis f?r No Signifkant Harards Considera tion:

Based on the following evaluation, SCE&G has detarmined the proposed change i

g does not involve a significant hazards consideration.

t 1.

The proposed change does not increase the probability or consequences of p.

an accident previously evaluated in the FSAR.

?.E The deletion of surycillence requirements not applicable to the L7 Virgil C.

Summer Nuclear Station in no way diminishes - surveillance requirements presently in place in technical specifications fo, MOV's s

L and their associated safety systems.

These tests are used to assure b,

that thermal overloads and/or bypass circuitry associated with each MOV V

will not prevent it from operating under accident conditions.

e f

Therefore, the. probability or consequences of a previously evaluated accident has not been increased.

Additional testing is also being imposed on. MOV's with non-bypassed overloads to assure their operability under accident conditions.

Since this proposed change does'not physically alter safety related equipment or change the safety function of any safety related equipment, the

,t probability or consequences of a.previously evaluated accident has not d

been increased.

Additional MOV's have been included to the list of MOV's subjected to i

these surveillance tests.

Adding requirements will not increase the i

L' probability or consequences of an accident previously evaluated but will add to the operability checks already in place.

The deletion of-two valves from lable 3.8-2 which no longer exist in the t

plant system will not increase the probability or constquences of an accident previously evaluated in the FSAR.

These M0V's iere removed in accordance with the plent' modification program and are no longer subject to testing requirements.

And lastly, rearranging Table 3.8-2 into. alphanumeric order, updating

,o,'

valve designations, and making the valve function listing consistent J

with the site computer listing are editorial changes in nature and have no technical impact.

No phs ical-change to the plant is being made and test requirements for the MOV's are still in place.

These changes therefore will not increase the probability or consequences -of an-accident prevlously evaluated in the FSAR.

2.

The proposed change does not ercate the possibility of a new or different kind of accident from any previously evaluated.

The deletion of surveillance requirements not applicable to Virgil C.

Summer. Nuclear Station will. not create the possibility of a new or dif ferent kind of accident since surveillance requirements presently in technical. specifications for MOV's and their associated safety systems are still in niace.

q nwn t

Atfachnent 4 of Document Control Desk Letter October 26, 1990 Page 3 L,

Adding surveillance test to MOV's with thermal overloads not bypassed does not contribute to the possibility of a new or different kind of accident since the plant as described in the FSAR is not being physically altered.

Additional testing will only add to the operability i

checks already in place in the safety analysis of the FSAR.

The addition of twelve valves being subjected to testing will not eo increase the possibility of a new accident from any previously evaluated.

As stated before, adding operability checks does not create a safety problem but adds to the assurance that the MOV's will operate safety and correctly under accident conditions.

The deletion of two valves from Table 3.8-2 will not create a new kind

,L4 of accident since these MOV's were removed and no longer impact on the plants safety systems.

lastly, rearranging Table 3.8-2 into alphanumeric order, updating valve designations, and making the valve function listing consistent with the site _ computer listing will not create the possibility of a new or different accidnt than previously evaluated since they have no technical impact and are purely administrative changes.

No change to the plant is being-made and surveillance requirements are not being decreased.

3.

The proposed change does not reduce the margin of safety as defined in the bases of the technical specifications.

The deletion of non-applicable surveillance requirements does not alter the basic surveillance requirements in the technical specifications imposed on MOV's with thermal overload protection.

Therefore, the X

margin of safety as defined in the technical specification bases has not been reduced.

Additional surveillance testing imposed on MOV's with thermal ov'Wado not bypassed does not reduce the margin of safety as defined in c

technical specifications.

It does, however, add assurance to the operability of these MOV's which is in the intent of the surveillance tests.

Additional MOV's have been included in the list of MOV's that are subjected to _ these surveillance tests.

- Adding requirements does not decrease' the margin of safety, but instead adds to the operability a

checks aircady in place.

And as before stated, assuring operability is the intent of the surveillance tests.

The deletion of two valves trom lable 3.8-2 will not decrease the margin of safety because the M0V's are no longer a part of the plant system.

Lastly, rearranging Table 3.8-2 into alphanumeric order, updating valve designations, and making the valve function listing consistent with the 1

op

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"Attachme'nt 4 of Document Centrol Desk Letter October 26. 1990 i

Page 4 i

site computer listing have no technical impact.

All test requirements as described in the technical specifications are still in place for the MOV's on Table-3.8-2.

Therefore, this change will not reduce the margin i

of-safety as described in the bases of the technical specifications.

i Pursuant to 10CfR$0.91, the preceding analyses provides a determination that j

the proposed change poses no significant hazard as defined by 10CFR50.92.

In j

view-of the preceding. South Caroli.na Electric & Gas Company has determined that the proposed license-amendment does not involve any significant hazards considerations.

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