ML20138N567

Proposed Tech Spec Rev Re Upper Head Injection Sys Removal/Isolation

ML20138N567
Person / Time
Site:	McGuire, Mcguire
Issue date:	12/17/1985
From:	DUKE POWER CO.
To:
Shared Package
ML20138N557	List: ML20138N554 ML20138N567
References
NUDOCS 8512240069
Download: ML20138N567 (19)

Text

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Proposed-Technical' Specification Revision-1 UHI System Removal / Isolation

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3/4.5 EMERGENCY CORE COOLING SYSTEMS 3/4.5.1 ACCUMULATORS COLD' LEG INJECTION LIMITING CONDITION FOR OPERATION 3.5.1'1 Each cold leg injection accumulator shall be OPERABLE with:

The isolation valve open, a.

b.

A contained borated water volume of between C,6708022-and 4256 gallons, 73'l2-A boron ' concentration of between 1900 and 2100 ppm, c.

res-659 d.

A nitrogen cover pressure of between 430 and 48+ psig, and A water level and pressure channel OPERABLE.

e.

APPLICABILITY: MODES 1, 2, and 3*.

ACTION:

With one accumulator inoperable, except as a result of a closed a.

isolation valve, restore the inoperable accumulator to OPERA 8LE

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t status within 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> or be in at least HOT STAND 8Y within the next-6 hours and reduce pressurizer pressure to less than 1000 psig within ( /

the following 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br />.

I b.

With one accumulator inoperable due to the isolation valve being closed, either immediately open the isolation valve or be in at least HOT STANOBY within 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> and reduce pressurizer pressure to less than 1000 psig within the following 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br />.

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SURVEILLANCE REQUIREMENTS 1

i 4.5.1.1.1 Each cold leg injection accumulator shall be demonstrated OPERABLE:

a.

At least once per 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> by:

l 1)

Verifying the contained borated water volume and nitrogen cover pressure in the tanks, and 2)

Verifying that each cold leg injection accumulator isolation valve is open.

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• Pressurizer pressure above 1000 psig.

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McGUIRE - UNITS 1 and 2 3/4 5-1 Amendment No.47(Unit 1)

Amendment No.,28(Unit 2)

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SURVEILLANCE REQUIREMENTS (Continued) b.

At least once per 31 days and within 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> after each solution volume increase of greater than or equal' to 1% of tank volume by

-verifying the boron concentration of the accumulator solution;

.At least once per 31 days when the RCS pressure is above 2000 psig c.

by ver!fying that power to the isolation valve operator is disconnected by removal of the breaker from the circuit.

4 4.5.1.1.2 Each cold leg injection accumulator water level and pressure channel shall be demonstrated OPERABLE:

At least once per 31 days by the performance of an ANALOG CHANNEL a.

OPERATIONAL TEST, and b.

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

McGUIRE - UNITS 1 and 2 3/4 5-2 Amendment Node 7[ Unit 1)

Amendment No.J8(Unit 2)

3/4.5 EMERGENCY CORE COOLING SYSTEMS 3/4.5 1 ACCUMULATORS COLD LEG INJECTION LIMITING CONDITION FOR OPERATION L

-3.5.1./_EachcoldleginjectionaccumulatorshallbeOPERABLEwith:

'The isolation valve open, a.

b.

A contained borated water volume of between 8022 and 8256 gallons, A boron concentration of between 1900 and 2100 ppm, c.-

d.

A nitrogen cover pressure of between 430 and 484 psig, and A water level and pressure channel OPERABLE.

e.

APPLICABILITY: MODES 1, 2, and 3*.

ACTION:

With one accumulator inoperable, except as a result of a closed a.

isolation valve, restore the inoperable accumulator to OPERABLE k

status within 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> or be in at least HOT STANDBY within the next 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> and reduce pressurizer pressure to less than 1000 psig within (

the following 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br />.

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b.

With one accumulator inoperable due to the isolation valve being

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closed, either immediately open the isolation valve or be in at least t

HOT STANDBY within 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> and reduce pressurizer pressure to less 2

than 1000 psig within the following 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br />.

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SURVEILLANCE REQUIREMENTS l

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4. 5.1[.1 Each cold leg injection accumulator shall be demonstrated OPERABLE:

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At least once per 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> by:

a.

1)

Verifying the contained borated water volume and nitrogen cover pressure in the tanks, and 2)

Verifying that each cold leg injection accumulator isolation valve is open.

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• Pressurizer pressure above 1000 psig.

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I McGUIRE - UNITS 1 and 2 3/4 5-k p Amendment No 47(Unit 1) i Amendment No.,28(Unit 2)

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EMERGENCY CORE COOLING SYSTEMS

-SURVEILLANCE REQUIREMENTS (Continued) b.

At least once per 31 days and within 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> after each solution volume increase of greater than or equal to 1% of tank volume by verifying the boron concentration of the accumulator solution; At least once per 31 days when the RCS pressure is above 2000 psig c.

by verifying that power to the isolation valve operator is disconnected by removal of the breaker from the circuit.

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I 4.5.1.J'.2 Each cold leg injection accumulator water level and pressure channel shall be demonstrated OPERABLE:

At least once per 31 days by the performance of an ANALOG CHANNEL a.

OPERATIONAL TEST, and b.

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

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i McGUIRE - UNITS 1 and 2 3/4 5.2 6 r Amendment No.A7(Unit 1)

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T IEMERGENCY CORE'C00 LING SYSTEMS f3/4.5.1.3 4' UPPER HEAD INJECTION x.

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gRGENCY CORE COOLING SYSTEMS UPPER HEAD INJECTION LIMITING CONDITION FOR OPERATION 3.5.1'.g Each Upper Head Injection Accumulator System shall be OPERABLE with:

a.

The isolation valves open,

.b.

The water-filled accumulator containing a minimum of 1850 cubic feet of borated water. having a concentration of between 1900 and 2100 ppm of boron,.and c.

The nitrogen bearing accumulator pressurized to between 1206 and 1264 psig.

APPLICAB.LITY:

MODES 1, 2 and 3.*

ACTION:

.a.

With the Upper Head Injection Accumulator System inoperable, except as a result of a closed isolation valve (s), restore the Upper Head Injection Accumulator System to OPERABLE status within 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> or be in at least HOT STANDBY within the next 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> and reduce pressur-4 izer pressure to less than 1900 psig within the following 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br />.

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b.

With the Upper Head Injection Accumulator System inoperable due to the isolation valve (s) being closed, either immediately open the isolation valve (s) or be in at least HOT STANDBY within 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> and g

reduce pressurizer pressure to less than 1900 psig within the follow- /

ing 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br />.

p SURVEILLANCE REQUIREMENTS 3

4.5.1.g Each Upper Head Injection Accumulatsr System shall be demonstrated OPERABLE:

a.

At least once per 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> by:

1)

Verifying the contained borated water volume and nitrogen pressure in the accumulators, and 2)

Verifying that each accumulator isolation valve is open.

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• Pressurizer Pressure above 190,0 psig, l

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i Amendment No.,47) Unit 2)

Amendment No. 28 (Unit 1)

McGUIRE - UNITS 1 and 2 3/4 5-3a

y EMERGENCY CORE COOLING SYSTEMS SURVEILLANCE REQUIREMENTS (Continued) l

'b..

At least once per 31 days and within-6 hours after each solution volume increase of greater than or equal to 14 of tank. volume by verifying the boron concentration of the solution in the water-filled accumulator;

c..

At least once per 18 months by:

1)

Verifying that each accumulator isolation valve closes automatically when an actual or simulated water level signal of 76.25 i 3.3' inches above the-bottom inside edge of the water--

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filled accumulator exists.

If actual water level is used, then (f'

the accumulator shall be at atmospheric pressure. -

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2)

Verifying that the total dissolved nitrogen and' air in'the water-filled accumulator is less than 80 scf per.1800 cubic-feet.of water (equivalent to 5 x 10-s pounds nitrogen per 4

pounds water).

d.

At least once per 5 years by replacing the membrane insta11ea

'between the water-filled and nitrogen bearing accumulators and verifying that the removed membrane burst at a differential pressure of 40 i 10 psi.

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McGUIRE - UNITS 1 and 2 3/45-ff Amendment No.

Amendment No 47 (Unit 1) 28'(Unit 2)

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? EMERGENCY CORE COOLING SYSTEMS' t'

' UPPER HEAD INJECTION-

' LIMITING CONDITION FOR-OPERATION =

73;5.1.4 ~ Each Upper. Head Injection Accumulator System shall be isolated with o

the isolation valves -closed.

APPLICABILITY:-[ MODES 1,'2; and 3.- (With Cold Leg Accumulators and discharge paths suitably modified.)-

5 ACTION:

va. iWith the Upper Head. Injection Accumulator System isolation v'alve(s)

J open, either immediately close the isolation valve (s) or be in HOT-L

' STANDBY within'6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> and reduce pressurizer pressure to less than-1900 psig within the next 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br />.

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LSURVEILLANCE-REQUIREMENTS 4.5.1.4 Each Upper Head Injection Accumulator System:shal.1 be demonstrated

-isolated at least once per 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> by :

1) : Verifying -that each accumulator isolation valve is-closed.

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g j/4511 ACCUMULATORS l J: TheOPERABILITYofSacht Reactor Coolant System (RCS) accumulator ensures-

. 1-ithat a! sufficient: volume of; borated water will.be-immediately forced into the.

m reactcrecore through:each.of the cold legs-in the: event the RCS pressure falls 4

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_;below:the pressure'of4the accumulators.. This initial surge of water into.the

>corejprovides;the' initial cooling mechanism'during large RCS pipe ruptures.

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sThe~1imits on accumulator vnlume, boron concentration ~ and pressure ensure thatithe, assumptions used forfaccumulator/ injection'in the safety analysis are amet/

The! accumulator power operatediisolation valves are considered to be.

" operating bypasses":in the' context of IEEE Std. 279-1971, which requires that a

bypasses of;.a protective: function.be removed: automatically whenever permissive-l conditions ~are not met.

In addition, as,these accumulator isolation valves

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fail'to meet' single failure criteria,' removal of power to the valves is required.

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JTtie limits: for, operation with an accumulator inoperable for any reason jexceptfan. isolation l valve closed minimizes the time exposure of the plant to a e

7LOCA event; occurring concurrent with failure of an additional accumulator.

which may; result'in unacceptable' peak claddinq~' temperatures.

If a closed

isolation valve'cannot'be immediately opened, the full capability of one

accumulator,is not available and prompt action.is required to place the s;

reactoriin a mode where.this capability is not required.

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1 cThe original 111 censing bases of'McGuire assumes both the UHI system and Lthe: Cold; Leg Accumulators function'to mitigate postulated accidents.

Sub 1 l sequent analyses;. documented in."McGuire Nuclear Station, Safety' Analysis for UHI Elimination'F dated-September,1985, and docketed by Duke. letter dated

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October 2,C1985,-support the~ determination'that UHI is no longer required

-provided'thefCold Leg Accumulator volume is adjust'ed to be consistent with that' assumed in'the Safety Analsyis.

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,Accordingly, Specification 3/4.5.1.1 on pages 3/4 5-1, -2 is prov.ided Taslthe. planned final condition of'the cold: leg injection system with water

volume and~ nitrogen cover pressure as assumed in the Safety Analysis.

Itiis1 applicable for the conditions of UHI being'either physically removed or

-i sol ated.- It has a' prerequisite that the cold leg accumulators and discharge

flow paths are consistent'with assumptions used in the Safety Analysis.

LSpecification 3/4.5.1.2 on page 3/4 5-2a, -2b is the Technical Specification l requirements for the-Cold Leg Injection with UHI system operable. As this is l expected to be an inter.im condition, the pages have been renumbered with

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' suffixes a,'

b.

-With ' respect ~ to Technical Specifications for the UHI system, page 3/4.5-3 is provided as the planned final condition of the plant, that being with the UHI system deleted.- New page 3/4 5-3c is provided to cover

'the condition following modification of the cold leg accumulators and dis-charge paths.- This new requirement is that the isolation valves be closed

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~.ECCS SUBSYSTEMS (Continued):

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tand remain closed.1[ Surveillance once per shiftL(12' hours)-is provided. -New

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jpages;3/4 5-3a duplicates the present Technical Specification for operability iof theLUHI system and is now Specification 3.5.1,3.

As?this is expected to 7

L Lbe an interis; condition-the:page-has.been renumbered to 3/4 5-3a.' Page'3/4-

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f5-3bprovidesSthecontinuation_ofthesurveillancerequirementsofSpecific-j.

3ation: 4.'5.122-when UHI system operabilityfis. required.

. 13/4;5.2"and3/4.5.'3 ECCS SUBSYSTEMS!

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.The,0PERA8ILITY of:two independent ECCS' subsystems ensures:that sufficient-iemergency core cooling _-capability will be available in.the' event of a:LOCA m

assuming

the lo'ssLof one subsystem;through any single; failure consideration.

s Either subsystem operating in conjunction with the accumulators;is capable of l

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? supplying' sufficient core cooling:to limit the-peak cladding temperatures 4

withinl acceptable limits.for :all' postulated. break sizes ranging from ;the-

' - Tdouble' ended break of the largest RCS cold!1eg' pipe' downward.

In addition, Leach:ECCS subsystem provides"long-term core cooling' capability.in the tracirculation mode during the accident recovery period.~.

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- With the1RCS temperature below;350*F, one OPERA 8LE~ECCS subsystem is.

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acceptableJwithout single failure consideration on the basis of the stable s,

reactivity condition'of the reactor and the limited core cooling-requirements.

.-lThet11mitation for-a maximum'of one centrifugal charging pump and one JSafetysInjection' pump to be OPERABLE and the Surveillance Requirement to Lverifylall charging pumps ~and Safety' Injection-pumps except the required

0PERABLE. charging pump to be inoperable

below 300*F provides assurance that a Emass addition pressure transient can be relieved by the' operation'of-a single

' PORV.-

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The-Surveillance: Requirements'provided to ensure OPERABILITY of each

.. component ensures-that at a minimum, the assumptions used in the safety-

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ianalyses are met and that subsystem OPERA 8ILITY i_s maintained.

Surveillance 3 Requirements for throttle valve position ~ stops and flow balance testing

% + Q provide' assurance that proper ECCS flows will be maintained in the' event of a

.LOCA.'LMaintenance of proper flow resistance and pressure drop in the piping

^.systemLtc each injection point. is -necessary to:

(1) prevent total pump flow fron exceeding runout conditions when the system is in its minimum resistance

' configuration,'(2)-provide the proper flow split between injection points in

accordance with:the-assumptions used in the ECCS-LOCA analyses,'and (3) provide an acceptable' level.of total ECCS: flow to all injection points equal to or above th'at assumed in the ECCS-LOCA analyses.

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'3/4.5.4,

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.MCGUIRE - UNITS 1 and 2-8 3/4 5-2 1

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3/4.5' EMERGENCY CORE COOLING SYSTEMS BASES' 3/4.5.5 REFUELING WATER STORAGE TANK The:0PERABILITY;off the1 refueling water _ storage tank (RWST) as part of the ECCS~ ensures that a. sufficient supply of borated water is available for Einjection'by the ECCS in'the event of a LOCA..The limits on.RWST minimum volume' and boron concentration _ ensure that:

(1) sufficient water is available

' within containment-to. permit. recirculation cooling flow to the core, and.

.(2) the reactor williremain subcritical in'the cold. condition following mixing lof the RWST.and the RCS water volumes with all control rods inserted except for the most reactive control assembly.

These-assumptions are consistent with

.the(LOCA analyses.

LThe contained water volume limit includes an allowance for water not usable because of tank discharge line location or other physical character-

'istics.

-The limits on contained water volume and boron concentration of the RWST also ensure a pH_value of between 8.5 and 10.5 for the solution recirculated

=within containment after a LOCA.

This pH band minimizes the evolution of iodine and minimizes the effect of chloride and caustic stress corrosion on mechanical: systems and components.

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Technical Discussions of

-Proposed Technical Specification Revisions 5

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M TECHNICALiJUSTIFICATIONi s

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,., 2 f Bylietter7 dated May;9,t1985,? Duke made an: initial; submittal regarding elimination) f dR, fofJthe; Upper ~ Head)Injectioni(UHI).' system'. T Containedftherin-were proposed changes :

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ztoJeeveralEpagesjofiTechnical; Specifications: among which ;were pages L3/4 5-11

'" %, d and 3/4~5-3.L JItiis"noted :that'at the - time of i this. submittal, no changes were

% f m M prop (osedjto;the-Bases'of' Technical l Specifications.. O gn f..;

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..'lBylletteridatedfoctober:2,I1985.4 Duke submitted'a[ document entitled "McGuire-j;i.jF

• JNucleariStation,'SafetyDAnaly~ is' forlUHI Elimination" ~ dated " September, 1985. -

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2 No. revisions} to Technical Specifications;were; proposed ?in this letter. i However,

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Lby?letteridated' October;14,:1985pDuka' supplemented.the initial submittal and-ffMg_Mfproposed#a?revisionjojage3/4.5-1;to#revisaithefrequired!ColdLegAccumulator:

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Rvolume.?to;berconsistent with.that' assumed in the Safety? Analysis.

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NRClissuediamondments'-47Tand 28 to the-wm

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$d s Subsequently,(on November)1,11985,:.-

@t B 3Didd/McGuire(OperatingLicenseswh.ichaffectedlpagesf3/4L5-1iand~3/415-3.LThis'is e

' O oneiof:two? factors.that' led to theLdecision to again-supplement:the. initial-h 2[

Ofoubmittal'andEto clearlyitate, in proposed Technical. Specifications, the require-7

$ $l A fmonts forloperation with1UHI.in'any one:of-three different conditions:.:func-m7

$ tionally operable,(isolated,,or: removed.L w;

[ W JThe second; factor.is'.thc'revisionfof Duke's plans:withjrespect to UHI.:' Preliminary

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M Mplans: called for tho' removal ofothe'UHI_ system from both.McGuire. units during-

'5-EtheE1986Crafueling; outages. Changes;in the outage-planning schedules resulted ys' NinfthA; delay;ofiUNIremoval(from'McGuireUnit2;until'1987whiletheMcGuire J X [F ? Unit1 UHI remova11remainsLinLthe"1986 refueling outage plans'.. The. operational:

1. 1 O f 3 problems: associated 4with;the UHILsystem experienced'at.McGuire prompted' Duke hPower3tojinvestigateI he possibia operationiof Unit 2 during Cycle 3 with the.-

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7 W-;UHI; system, functionally _disabledLprior to'theyphysical, removal:in 1987..

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J g?N W ! Duka Power / contracted 'Westingh'ouse0 to -determine !the' necessary plant d modifications r.equired,to ensure the assumptions:of the-safety = analyses 1 l

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/ Lsubmitted to the NRCLinL0ctoberzi985 t'o+ support removal of.the;UHI System-l^-

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t would:also bound operation 'with the UNI' System f out 'of. service. : The un-oresultst of' the studyjindicate the following actions are required. to ' align

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theLplant: configuration-with the safety analyses assumptions:

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{ Accumulators.dischargepiping-coensureactual

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c accumulator discharge line resistances are within a

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. tolerance; bands'of.ECCS analysis.

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(;2. : Reduce thel nominal' water level in the Cold Leg J

7%,g Accumulators and modify [ instrumentation, alarm F

,r functions,!and' procedures accordingly.

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,' %. 3.-tIncrease'the nominal gas cover pressure in the

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Cold Leg Accumulators and modify instrumentation.

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alarm functions',' and procedures accordingly.

4.

Ensure UNI' isolation valves remain closed during

operation.'

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.c MItems;1'+2 S3 consitute modifications required >by the phrase " Cold Leg Accumulator-

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' qq dandidischarge? paths'suitablyfmodified" containedLin'the proposed l technical.

, lspecificationsklItem[4Jis afrequirement that will;be(implemented by administra--

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p 7 jtive."contrals;andjisLrefleetedLin proposed new Technical Specification 3/4.5.1.4 E^,

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>With these modifications-:. implemented ;the planticonfiguration is:functionallyL I

, - l he isans fas(described ; inithe previous: submittals ' associated with = the removal. of.

%the~UHI system.i Therefore "the analyses submitted co' justify the physical; cc ?

aremoval of UHIfwill?also bound; operation'of McGuire Unit 2'with the UHI ' system-

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M.< out'of? service'soflong as the'above minor modifications are made. The results 1of the? analyses;show thatLoperation with UNI _'out ofEservice and above modifi-:

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M_ cations implemented; continue-to, satisfy all safety.and regulatory requirements including.10 CFR 50" Appendix K.t

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,W TheLfo11owing discussionLisLprovided as.a. summary.of-the basis for'esch change M

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tproposed herin.? Changes proposed in the May 9,' 1985 letter'not'on pages'3/4.5-1*

- land;3/4:5.3 remain valid as"does the significant hasards consideration previously-Wl^

1provided.:

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Page13/4?5-15 fLCo 3;5.1.1.b-is revised ~as previously proposed and technically juscified.;in letter dated-October 14, 1985.

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+ LCOI3.5.1.1.d'is revised as proposed and technically juscifie'd I?'m m.

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jin letter dated May;9, 1985.

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APlLICABILITYl1s; revised to operation with UHI physicall'y.

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removed-(asidisetjssed in May 9. 1985. submittal)lor. isolated 1

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N (as" discussed herin). LThe Cold Leg Accumulators and discharge

. paths must;be suitably modified..

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--LACTIONS a,2bSare'now consistent with Amendments 47 and 28.

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PageL3/4'5-2:- NoLchanges,this.page, provided for information only.

JPageL3/4'5h2a-'.Theexistingtechnicalspecificationforcoldlegaccumulator

(3.4.5.1.1) is revised to be Specification 3/4.5.1.2.

This Specification remains'in effect.so long as UHI operability gn.

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is : required which 'is.unti1~ the cold leg accumulators and ;

7 ^ D Gi discharge paths are. suitably modified.

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- APPLICABILITY is revised to specifically' denote that these C

requirements are in'effect with UNI operable.

7

- Page number is new as this specification will be effective for an interim period of time.

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Page 3/4 5-2b - The existing technical specification 4.5.1.1.2 is revised to t

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4.5.1.2.2'to be consistent with the numbering of the preceding page.

~ Page number is revised to be consistent with the preceding page.

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6 fPage 3/4?5 This(page would deleteLall specifications'related to.the UNI' Api pupon removal of,thefsystem.7Specifically~~ deleted'are-Specifica-Leions~ 3/4.5.~1.3.4'which are described in the following.x Thisi gd 9f,* -

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' 4 [." specification represents the~ ultimate configukation ofithe plant. -

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- JAPPLICABILITY'is revised-to reflect.that this specification is

.M Oi Lapplicableiwhen UHILis' required to beLoperable and.the cold leg'_

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' accumulators;and-discharge paths have not been' suitably modified..

s 7 This'specificationjis deleted by the statement contained on ma,

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- A ' ;; page 3/4,5-3 upon ; removal of UHI.

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4; t Pagel3/4 '5-3th. This is former,pa e 3/4. 5-4.

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c W fPag'et3/4 5-3d.- This is a new page'and contains requirements'when UHI is L

' isolated.by closure of'the' isolation'vulves and the cold leg 44 7 J.g : " : accumulators and discharge paths have been suitably modified.

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y iThe.LCO is as requ' ired byjthe donfiguration' identified previous-4

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< < 11y in-this Attachment.

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' The surveillance interval for verifying valves closed is the same as z7 that for verifying' cold' leg l accumulator injection. isolation valves

open

and for' verifying UHI~ accumulator isolation valves open andT is'thus considered to'be' reasonable.-

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-;This specification 1s deleted by:the statement contained'on 7

page 3/4 5-3 upon removal ofcUHI..

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Previously Duke.submittals'on-this issue did.not~ address revisions to the -

i' Bases. Accordingly.; the. proposed addition to theLexisting Bases is provided.

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.; TECHNICAL? DISCUSSION OF-UNI ISOLATION VALVES ~

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..,, s tThe upper) headfinjection, lines are provided with four accumula; tor isolation 7 valves 7

%V Ltweiin each'line W whose function"is;to; isolate:the nitrogenjgas;supplyjfrom the;.

y%g', ', 4 Reac' tor : Coolant c ystem following the" injection of the borate

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operated ' gate valves :of.the' split disk design 7 type. J The disks are; guided 'through--

fp, W*J7out?the full? travel.eThe seating: surfaces are hard faced to' prevent gallingTand, q

< reduce wear.

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1ofitheLfour!UHI accumulator' level detectors.-

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3 5A" common natural;hy'draulic;~ system is provided to service'all four! isolation ~va14esL 4[ individually.x ;The; system)provides a hydraulid: fluid reservoiri a f11ter, hydraulic;

$; ' YM pump...and associated. valving.7. This : pump provides :the m'otive power; to:

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N a11Ffourlisolationivalve compressed: gas accumulators,.or?2)' position the valves ggrg i individus11p toL theirJc,losed - or norms 11y. open, position.

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finjection lines remain'isolatedLfo11owing approval by NRC to operate McGuire g'

JwithoutsUNI and the cold Lleg accumulator. and discharge paths have been -suitably.

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, modified.!

- @v f Spurious operation of.UHI;in this mode'(i.e. four~-isolation valves gagged). is.

not considered credible. Further with two' isolation ~ valves and two check valves i

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' closed.:it is'not considered credible = for any substantial backleakage from the f

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T reactor coolant = system to occur.

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m (The.. proposed periodic surveillance.of-these isolation valves provides additional'

))u[y p (assurrance that{they will remain closed.

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' ATTACHMENT 31 y-n x

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Analysis!of'Sianificant Hazards'Consideratfon 7

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M k.;,-f As;refuired[bf/10$CFR 50i91, th'is analysisil's,prohided concern"idg?whetheri the.

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• 'fc 1 proposed changes-to theLtechnical.apacificac(ons involve.significant hazards-

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) considerations,1>asdefinedbyfl0CFR50.92.;-p-

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The! change proposed herein'aieks'to add althird operational configuration of.

' ;..., u (UHI;-l that being'isolatedNMcGuire.is presently licensed i o operate with UHI t

operationali (A, previous submittal' associated ~with operation of.McGuire with-ff 'p.,Q-[UHI:removedwas-previouslynoticed'in'theFederal~Registerdated' July-22;'1985.

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.The following;significant hazards analysis a'ddresses the' operation-of McGuire

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, ',m ;c iwith. UNI isolated..

yg iCRITER10N11:.VDoes the: proposed amendment involv'e. a significant increase.'in the y

] M; probability or consequences of an' accident previously esaluated. /

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8 NO

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V' The proposed ? amendment does not involve a significant increase in.the.

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09 (prabatility or' consequencesiofian accident. McGuire~is presently.

.t licensed to operate'with UH1' operational. This proposed amendment

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3 seeks?to' allow operation with?UHI. isolated or,'as previously noticed,L f

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iwith UHI removed.l.?Such operation.will not affect tb: probabil'ity of a

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, wi 1large. break LOCA: occurring. Similarly the consequences of a'previously t,d

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'ievaluated; accident are not affected. With'UHI installed but isolated.

g6 y Nthe consequenc~esLwould;be no worse-than thos'e assumed'with UHI removed..

- fin; fact.Lbased:onlthe analysis previously provided, the consequences 4

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g are' bounded' by the present LOCA anafysis.

Inadvertent actuation of

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J--15olated,UHIwouldtend-toreducethelconsequences'due'togthe.added 9x;

.;anounts'of?boratedLwaterfinjected into(the reactor; coolant system.

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- : L TechnicallSpecification's areL provided-however toVassure that the 3:

isolation valves remainmin.a closed. position'and are periodically:

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, cverified closed to. minimize-the likelihood of spurious operation.

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(CRITERION ;2 CDoch' he pro' posed amendment create the possibility of a new or 2

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, s different kind ;of accident froncany accident > previously evaluated.-

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' In a' Federal Register notice dated J'ly-22, 1985, the NRC Staff 7

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.-is' sued a preliminaryLdetermination :that operation.without UHI ~ at ' power f

y 7: p.

' levels in-excess of-46% introduces an accident scenario not previously R,

C

evaluated.c This'de' termination was based on Duke's submittal oS May 9, f

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-1985'wherein;it was proposed to remove UHI in its entirety. While g"

EDukedoes,notLwholly agree wich the NRC staff preliminary determination,

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ithe~ proposed amendment contained herein is no'different technically

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.ithan'that;which was pro ^viously provided. Accordingly, while theg..

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'1 merits ~of.whether or,not operation with UHI removed or isolated'

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+ yconstitutes consideration as a:significant hazards could be continued w

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' doWetargued.the fact is that' such a operational configuration has

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n Lalready~.been noticed as a'significant hazard. And thus, the proposed

. amendment contained herein is bounded by the above referenced Federal Q ng;, -

..m ic

- ;. Register notice.-

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- d ATTACIDENT 3 Page 2

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S 4,5, CRITERION 3. Does the proposed amendment, involve a significant reduction ina

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margin of-safety.

~h As statedLin our May.7..1985 submittal, thproposei amendments do e

not involve:a significant. reduction _in a margin of.afety. The analysis provided therein remains. applicable.

LIn conclusion,'.the proposed change addressed by.this submittal. namely operation

-with UNI; isolation. valves closed, is not. considered to be a'.significant hazards considerstion..

' IfLit is determined that.a Federal-Register notice is required'to address new Specification 3/4.5.1.4, then Duke requestis that such -a notice be published in

a. timely' manner.

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