ML20236H172
| ML20236H172 | |
| Person / Time | |
|---|---|
| Site: | Arkansas Nuclear  |
| Issue date: | 10/28/1987 |
| From: | ARKANSAS POWER & LIGHT CO. |
| To: | |
| Shared Package | |
| ML20236H167 | List: |
| References | |
| NUDOCS 8711030494 | |
| Download: ML20236H172 (14) | |
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e ATTACHMENT'l
,sa PROPOSED TECHNICAL SPECIFICATION-CHANGES
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REACTIVITY CONTROL SYSTEMS l
3/4.1.2 BORATION SYSTEMS FLOW PATHS - SHUTDOWN f
LIMITING CONDITION FOR OPERATION q
l 3.1.2.1 As a minimum, one of the following boron injection flow paths _shall be OPERABLE:
q a.
A flow path from the boric acid makeup tank via either a boric acid makeup pump or a gravity feed connection and charging pump'to the Reactor Coolant System if only the-boric acid makeup tank in Specification 3.1.2.7a is OPERABLE, or t
b.
The flow path from the refueling water tank via either a_ charging
-j pump or a high pressure safety injection pump to the Reactor a
Coolant System if only the. refueling water tank in Specification 3.1.2.7b is OPERABLE.
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l APPLICABILITY:
MODES 5 and 6 i
ACTION:
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l With none of the above flow paths OPERABLE, suspend all operations involving j
CORE ALTERATIONS or positive reactivity changes-until at least one injection path is restored to OPERABLE status.
l SURVEILLANCE RE0VIREMENTS i
4.1.2.1 At least one of the above required flow paths shall be demonstrated OPERABLE:
a.
At least once per 7 days by verifying that the temperature of the flow path from the discharge of the boric acid makeup tank to the suction of the charging pump is above 55 F when a flow path from the boric acid makeup tanks is used.
b.
At least once per 31 days by verifying that each valve _(manual, power operated or automatic) in the flow path that is not locked, sealed, or otherwise secured in position, is in its correct position.
3 ARKANSAS - VINT 2 3/4 1-7
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REACTIVITY CONTROL SYSTEMS FLOW PATHS - OPERATING
' LIMITING' CONDITION FOR OPERATION'-
3.1.2.2
~ The following boron injection' flow paths shall be OPERABLE,.
depending on the volume available inithe boric. acid. makeup. tanks.
a.
~If the contents of ONE boric acid' makeup ~ tank meet ~the' volume requirements of Figure 3.1-1, two of.the'following three flow paths to the Reactor Coolant System?shall be OPERABLE:
1.
One flow path'from the appropriate boric acid makeup' tank-via
. a boric acid makeup pump and a charging pump.
- 2.
One flow path from'the appropriate boric acid makeup tank'via
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a gravity feed connection and a charging pump.
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3.
One flow path from the, refueling water; tank via.a charging pump.
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b.
If the contents of BOTH boric acid makeup'-tanks are.needed to meet-the volume requirements of Figure-3.1-1, four'of the following-five flow paths to the Reactor Coolant System'shall be OPERABLE:
1.
One flow path from. boric acid' makeup tank A via a: boric acid makeup pump and a charging pump'.
2.
One flow path from boric acid makeup tank B via a boric. acid makeup pump and a charging pump.
3.
One flow path from boric; acid makeup tahk A via 'a gravity -
feed connection and a~ charging pump. '
4.
One flow path from boric acid makeup tank B via:a' gravity feed connection and a charging pump.
5.
One flow path from the refueling water tank'via a' charging pump.
APPLICABILITY:
MODES 1, 2, 3 and 4 ACTION:
With any of the boron injection flow paths to the Reactor Coolant: System required in a or b above inoperable, restore the inoperable flow path to the Reactor' Coolant System to OPERABLE. status within 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> or be infat least-j H0T STANDBY and borated to a SHUTDOWN MARGIN equivalent to at least 15% Ak/k' at 200 F within the next 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br />; restore the flow ~ paths ~toLOPERABLE' status within the next 7 days or be.in COLD SHUTDOWN'within the next 30 hours3.472222e-4 days <br />0.00833 hours <br />4.960317e-5 weeks <br />1.1415e-5 months <br />.
ARKANSAS - UNIT 2 3/4 1-8 Amendment No. 241 q
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5 SURVEILLANCE REOUIREMENTSL' 43 14'.1.2.2
..Thef above ' required f1ow pathhis' hall"beidemonstra'tedLOPE'RABLEi li,
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.Ath-least:onceperi7_.daysby, verifying.thattthe.(temperature'ofth'e1 "a.. ; flow.pathLfrom the.' discharge;of.the'boricfacid makeup: tank (s)l:to-
..the suction of the charging' pumps is-above'55 F.-
b.
At.1 east' once per; 31, days.byJ verifying that each/valveI(manual',7;1 4
power. operated or.: automatic) inithe: flow path:thattisinot:(locked,. "
d" sealed, or. otherwise securedtin position, tisiin;its; correct
. position.
' At,least"once per 18'monthsLduring shutdown by= verifying thatLeachi L
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actuated valve.in the flow--pathTactuates-to'its correct ~ position onJa SIAS test' signal.
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l-2 ARKANSAS
,UINT 2 3/4 1-8a
' AMENDMENT N02:24, 1
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3 REACTIVITY CONTROL SYSTEMS BORIC ACID MAKEUP PUMPS - OPERATING l
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LIMITING CONDITl0N FOR OPERATION 3.1.2.6 At least the boric acid makeup pump (s) in the boron injection flow path (s) required OPERABLE pursuant to Specification 3.1.2.2 shall be l
.0PERABLE and capable of being powered from an OPERABLE emergency bus ifEthe flow path through the boric acid makeup pump (s) in Specification 3.1.2.2 is l
APPLICABILITY:
MODES 1, 2, 3, and 4 l
l ACTION:
With one boric acid makeup pump required for the boron injection flow path (s) pursuant to Specification 3.1.2.2 inoperable, restore the boric l
acid makeup pump to OPERABLE status within 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> to be inoat least HOT l
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 borated to a SHUTDOWN MARGIN equivalent 1
to at least 5% ak/k at 200 F; restore' the above required boric acid pump (s) to OPERABLE status within the next 7 days or be in COLD SHUTD0\\lN within the next 30 hours3.472222e-4 days <br />0.00833 hours <br />4.960317e-5 weeks <br />1.1415e-5 months <br />.
SURVEILLANCE REQUIREMENTS 4.1.2.6 No additional Surveillance Requirements other than'those required by Specification 4.0.5.
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ARKANSAS - UNIT 2 3/4 1-12 Amendment No. 24 J
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REACTIVITY CONTROL SYSTEMS B0 RATED WATER' SOURCES - SHUTDOWN LIMITING CONDITION FOR OPERATION 3.1.2.7 As a minimum, one_of the following borated water sources shall be OPERABLE:
a.
One boric acid makeup tank with:
1.
A minimum contained borated water' volume _ of _3,400 gallons i
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(equivalent to 31% of indicated tank level),
i 2.
A boric acid concentration between 2.5 WT% and 3.5'WT%, and 3.
A minimum solution temperature of 55 F.
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b.
The refueling water tank with:
1.
A minimum contained borated water volume of 61,370 gallons (equivalent to 7.5% of indicated tank level),
1 2.
A minimum boron concentration of 2500' ppm, and 1
3.
A minimum solution temperature of 40 F.
APPLICABILITY:
MODES 5 and 6 ACTION:
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With no borated water sources OPERABLE, suspend all operations involving j
CORE ALTERATIONS or positive reactivity changes until at least one borated l
water source is restored to OPERABLE status.
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SURVEILLANCE RE0VIREMENTS 4.1.2.7 The above required borated water sources shall be demonstrated' OPERABLE:
a.
At least once per 7 days by:
1.
Verifying the boron concentration of the water, 2.
Verifying the contained borated water volume of the tank, and 3.
Verifying the boric acid makeup tank solution temperature is greater than 55 F.
l b.
At least once per_24 hours by verifying the RWT temperature when it is the source of borated water and the outside air temperature ~
is < 40 F.
ARKANSAS - UNIT 2 3/4 1-13
FIGURE 3.1-1 MINIMUM BORIC ACD MAKEUP TANK VOLUME AS A FUNCTION OF 14000 STORED BAMT CONCENTRATION AND REFUELING WATER TANK CONCENTRATION 13000--
12000-NNM I
i 11000 l A' CE'PTA'BLE' VO' LUM lE REGION C
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h UNACCEPTABLE 'VOL'UME REGION N
2800 l
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l 3000-1 l
-20 2000_
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1000 --10 1
0 2.5 2.6 2.7 2.8' 2.9 -
3.0 3.1 3.2 3.3 3.4 3.5 l
(4375) (4550) (4725) (4900) (5075) (5250) (5425) (5600) (5775) (5950) (6125)
STORED DAMT CONC-WT% BORIC ACID,(PPM BORON) 1 ARKANSAS - UNIT 2 3/4 1-14
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REACTIVITY CONTROL SYSTEMS BORATED WATER SOURCES - OPERATING LIMITING CONDITION F.QR OPERATION 3.1.2.8 Each of the following borated water sources shall-be.0PERABLE:
a.'
At least one.of the following' sources with a minimum solution temperature of 55 F:
1.
One boric acid makeup tank, with the tank contents in accordance with Figure 3.1-1, or
-2.
Two boric makeup tanks, with the combined contents of the tanks in accordance with Figure 3.1-1, and
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b.
The refueling water tank with:
1.
A contained borated water volume of bei,,enn 464,900 and' 500,500 gallons (equivalent to an indicated tank level of between 91.7% and 100%, respectively),
2.
Between 2500 and 3000 ppm of boron, l
3.
A minimum solution temperature of 40 F, and 4.
A maximum solution temperature of 110 F.
l APPLICABILITY:
MODES 1, 2, 3 and 4.
l 1
ACTION:
a.
With the above required boric acid makeup tank (s) inoperable, restore the make up tank (s) to OPERABLE status ~within 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> or be in at least HOT STANDBY within the next 6' hours and borated to i
a SHUTDOWN MARGIN equivalent.to at~ least 5.0% Ak/k at 200 F; 1
restore the above required boric acid makeup tank (s) to OPERABLE l
j status within the next 7' days or be in COLD SHUTDOWN within the next 30 hours3.472222e-4 days <br />0.00833 hours <br />4.960317e-5 weeks <br />1.1415e-5 months <br />, b.
With the refueling water tank inoperable, restore the tank to OPERABLE status within one hour 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 in COLD SHUTDOWN within the following 30 hours3.472222e-4 days <br />0.00833 hours <br />4.960317e-5 weeks <br />1.1415e-5 months <br />.
SURVEILLANCE REQUIREMENTS 4.1.2.8 Each of the above required borated water sources shall be dert,nstrated OPERABLE:
ARKANSAS - UNIT 2 3/4 1-15 Amendment N0. N, 81:
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.[s,j LREACTIVITY-CONTROLESYSTEMS-SURVEI RANCE REQUIREMENTS (ContinuedF t
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.a.
At..least'.one per,7 days byi 4
1.
' Verifying =the boron concentration-in'~e'ach water source,'.
d 2.
Verifying th'e contained borated ' water-volume in e~ach watsr:'
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Verifying' the. boric acid makeup. tank (s)jsolution temperature is. greater than 55 F.
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' At least.once per 24 hour2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />s-by verifying the~ RWT temperature.
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ARXANSAS - UNIT 2 3/4 1-16 4
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REACTIVITY CONTROL' SYSTEMS BASES-j 3/4'.1.1.5 MINIMUM TEMPERATURE FOR CRITICALITY This specification ensures that the reactor will not be made critical-with the Reactor Coolant System average temperature less than 525 F.
This a
. limitation is required to ensure 1).the moderator temperature coefficient is within'its analyzed temperature range, 2) the protective instrumentation is j
within its normal operating range, 3) the pressurizer is capable of being in i
an OPERABLE status with a steam. bubble, and 4) the reacter pressure vessel i
is above its minimum RTNDT_ temperature.
3/4.1.2 BORATION SYSTEMS The boron injection system ensures that negative reactivity control'is l
available during each mode of facility operations.
The components required 1
to perform this function. include 1) borated water sources, 2) charging
-j pumps, 3) separate flow paths, 4) boric. acid makeup. pumps, and 5) an emergency power supply from OPERABLE diesel generators.
With the RCS average temperature above 200 F, a minimum of two separate and redundant boron injection systems are provided to ensure single functional capability in the event an assumed failure renders one of the i
systems inoperable.
Allowable out-of-service periods ensure that minor.
component repair or corrective action may be completed without undue risk to overall facility safety from injection system failures during the repair period.
l The boration capability of these systems is sufficient to provide a SHUTDOWN MARGIN from expected operating conditions of 5.0% Ak/k after xenon j
l decay and cooldown to 200 F.
The maximum expected boration capability i
requirement occurs at E0L from full power equilibrium xenon conditions and requires boric acid solution from the boric acid makeup tanks in the allowable concentrations and volumes' of Specification 3.1.2.8 and a small L
fraction of the borated water from,the refueling water tank required in i
Specification 3.1.2.8.
l The requirement in Technical Specification 3.1.2.8 for a minimum contained volume of 464,900 gallons of 2500-3000 ppm borated water in the refueling water tank ensures the capability.for borating the RCS to'the desired concentration.
The value listed is consistent with the plant ECCS requirements.
With the RCS temperature below 200 F. one injection system is acceptable without single failure consideration on the basis of the stable reactivity condition of the reactor and the additional restrictions prohibiting CORE ALTERATIONS and positive reactivity change in the event the single injection system becomes inoperable.
1 l
ARKANSAS - UNIT 2 0 3/4 1-2 AMENDMENT NO. 24 l
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f REACTIVITY CONTROL SYSTEMS BASES The boron capability required below 200 F is based.upon providing a
-1 5% AK/K SHUTDOWN MARGIN after xenon decayand cooldown from 200 F to 140 F.
1 This condition requires either borated water from.the refueling water.tankL or boric acid solution from the boric acid makeup tank (s) in accordance 'with the requirements of Specification 3.1.2.7.
4 The contained water volume limits' includes allowance for water not 1
available because of discharge line location.and other physical' characteristics.
The 61,370 gallon limit for the refueling water tank is based upon having an indicated level in the tank of at least 7.5%.
The OPERABILITY of one boron' injection system during REFUELING ensures i
that this system is available'for reactivity control while in MODE 6.
The limits on contained water volume and boron concentration of the RWT 1
also ensure a pH value of between 8.8 and 11.0 for the solution recirculated j'
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.
3/4 1 3 MOVABLE CONTROL ASSEMBLIES The specifications of this section ensure that (1) acceptable power distribution limits are maintained, (2) the minimum SHUTDOWN MARGIN is maintained, and (3) the potential effects of CEA misalignments are limited to acceptable levels.
The ACTION statements which permit limited variations from the basic requirements are accompanied by additional restrictions which. ensure that the original design criteria are met.
The ACTION statements applicable to a stuck or untripable CEA, to two or more inoperable CFAb, and to a large misalignment (g 19 inches) of two or more CEAs, require a prompt shutdown of the reactor since any of these conditions may be indicative of a possible loss of mechanical functional capability of the CEAs and in the event of a stuck or untripable CEA, the loss of SHUTDOWN MARGIN.
For small misalignments (< 19 inches) of the CEAs, there is 1) a small effect on the time dependent long term power distributions relative to those used in generating LCOs and LSSS setpoints, 2) a small effect on the available SHUTDOWN MARGIN, and 3) a small effect on the ejected CEA. worth used in the safety analysis.
Therefore, the ACTION ARKANSAS - UNIT 2 B 3/4 1-3 AMENDMENT N0. 24
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I ATTACHMENT 2.
DESCRIPTION OF TECHNICAL SPECIFICATION REVISIONS 1
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DESCRIPTION OF TECHNICAL SPECIFICATION REVISIONS l
TECHNICAL SPECIFICATION 3/4.1.2.1
'Page 3/4 2-7 The changes to both the Limiting Condition for Operation and the Surveillance Requirement reflects the proposed elimination of heat tracing:
operability requirements.
The minimum flow path temperature is reduced to 55 F.
TECHNICAL SPECIFICATION 3/4.1'.2.2 Page 3/4 1-8
- These changes also address the elimination of heat tracing operability-requirements and the change'in minimum flowpath temperature.- The flow path operability requirements are modified to permit the use of both BAMTs to meet the minimum volume requirements.
TECHNICAL SPECIFICATION 3/4.1.2.6 Page 3/4 1-2 This change corrects the reference to Technical Specification 3.1.2.2. to O
correspond to changes in required. flowpaths.
TECHNICAL SPECIFICATION 3/4.1.2.7 Page 3/4 1-13
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The change to Limiting Condition for Operation 3.1.2.7 a is the result of the reduced BAMT boron concentration and the corresponding impact on the 3
minim'um volume available for a cooldown in Mode 5.
.The change ~to 3.1.2.7 b is proposed in the concurrently submitted amendment request.
The change to Surveillance Requirement 4.1.2.7 a specifies the new minimum BAMT solution temperature.
FIGURE 3.1-1 Page 3/4 1-14 This figure supports Technical Specification 3.1.2.8 and is modified to reflect the change in BAMT concentration and the dependence in volume requirements on RWT concentration.
TECHNICAL SPECIFICATION 3/4.1.2.8 Page 3/4'l-15,16 The change to Limiting Condition for Operation 3.1.2.8 a permits the use of both BAMTs for compliance with the minimum volume requirements and eliminates heat tracing operability requirements.
The change to 3.1.2.8 b is proposed in the concurrently submitted amendment request.
Changes to Action statement support the use.of both BAMTs to meet minimum volume requirements.
The change to Surveillance Requirement 4.1.2.8 a.3 specifies the new minimum BAMT solution temperature.
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j requi.rements' forTthej RWT water Jin. support"of borationgduring _ cooldown) ' iThe' f,:
reference to heat: tracing.is'also' eliminated.
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Other changes reflectL.the revisionsiproposed 'toitheiRWTl boron l concentration:
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. requirements in the' concurrently: submitted-; amendment; request.: '
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