ML19327B452

Proposed Tech Specs Clarifying Tech Spec 3.2.1.2 Re Sys Piping & Valves Necessary to Establish Flow Path from Tank to Makeup Sys

ML19327B452
Person / Time
Site:	Arkansas Nuclear
Issue date:	10/19/1989
From:	ARKANSAS POWER & LIGHT CO.
To:
Shared Package
ML19327B451	List: ML19327B450 ML19327B452
References
NUDOCS 8910310219
Download: ML19327B452 (3)

Text

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l'*0FOSED TECHNICAL. SPECET:CAllDN CHANGES

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e 3.2 MAKEUP AND CHEMICAL ADDITION SYSTEMS ,

Applicability Applies to the operational status of the makeup and the chemical addition I systems.  ;

Objective To provide for adequate boration under all operating conditions to assure ability to bring the reactor to a cold shutdown condition.

Specification 3.2.1 The reactor shall not be heated or maintained above 200'F unless the following conditions are met:  ;

3.2.1.1 Twc mskeup pimps are o.cerable cycept as specified in Specification 3.3.

• i 3.2.1.2 A source of concentiated boric acid solution in addition to '

that in the borated water storage tank is available and operable. This requirement is fulfilled by the boric acid '

addition tank and one associated boric acid pump being operable. This tank shall contein t<t least the equivalent of the boric acid volume and contantration requircoents o/

Figure 3.2-1 as boric acid solution with a temperature of at least 10'F above the crystallization temperature. System piping and valves necessary to establish a flow path frem the tank to the makeup system shall also be operable and shall have a temperature of at least 10'F above the crystallization  !

temperature for the concentration in the tank.

3.2.1.3 The boric acid addition tank and associated piping, valves and both pumps may be out of service for a maximum of 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />. After the 24 hour2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> period, if the system is not i returned to service and operable, the reactor shall be l brought to the hot shutdown condition within an additional 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br />.  ;

Bases The makeup system and chemical addition system provide control of the reactor coolant system boron concentration. (1) This is normally '

accomplished by using any of the three makeup pumps in serias with a boric acid pump associated with the boric acid addition tank. The alternate l

method of boration directly from will bewater the borated the use of the storage makeup) tank. (2 pumps taking suction The quantity of boric acid in storage from either of the two above mentioned sources is sufficient to borate the reactor coolant system to a 1%

suberitical margin in the cold conaition (200*F) at the worst time in core ,

life with a stuck control rod assembly and after xenon decay.

Amendment No. 33 34

W -

Minimum volumes (including a 10% safety factor) as specified by Figure 3.2-1 for the boric acid addition tank cr 44,549 gallons of 2270 ppm boron as boric acid solution in the berated water storage tank (3) will each satisfy this requirement. The specification assures that adequate supplies are  :

available whenever the reactor is heated above 200*F so that a single ,

failure will not prevent boration to a cold condition. The minimum volumes -

of. boric acid solution given include the boron necessary to account for xenon decay.

The principal method of adding boron to the primary system is to pump the concentrated boric acid solution (8700 ppm boron, minimum) into the makeup tank using the 25 gpm boric acid pumps.

The alternate method of addition is to inject boric acid from the borated water storage tank using the makeup pumps.

Concentration of boron in the boric acid addition tank may be higher than the concentration which would crystallize at ambient conditions. For this reason and to assure a flow of boric acid is available when needed this tank and its associated piping will be kept 10'F above the crystallization temperature for the concentration present. Once in the makeup system, the concentrate is sufficiently well mixed and diluted so that normal system temperatures assure boric acid solubility.

REFERENCES

1. FSAR, Section 9.1; 9.2

2. FSAR, Figure 6-2 ,

3. FSAR, Section 3.3 Amendment 33, O , E2 35