Text

Proposed Tech Specs 3.2 Re Boric Acid Addition Tank Vol & Concentration Requirement
	ML19326B849
Person / Time
Site:	Arkansas Nuclear
Issue date:	03/14/1978
From:	; ARKANSAS POWER & LIGHT CO.
To:	;
Shared Package
ML19326B847	List: ML19326B846; ML19326B849;
References
	NUDOCS 8004180587
	Download: ML19326B849 (3)
	v • d • e

. - _

3.2 MAKEUP AND CHEMICAL ADDITION SYSTEMS Applicability Applies to the operational status of the makeup and the chemical addition 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 0

the following conditions are met:

3.2.1.1 Two makeup pumps are operable except as specified in Specification 3.3.

3.2.1.2 A source of concentrated boric acid solution in addition to that in the borated water storage tank is available and operable. This re-quirement is fulfilled by the boric acid addition tank. This tank shall contain at least the equivalent of the boric acid volume and concentration requirements of Figure 3.2-1 as boric e;1d solution with a temperature of at least loof above the crystallization temper-System piping and valves necessary to establish a flow path ature.

from the tank to the makeup system shall also be operable and shall have at 1 cast the same temperature as the boric acid addition tank.

~

One associated boric acid pump is operable.

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 0.00667 hours 3.968254e-5 weeks 9.132e-6 months . After the 24 hour2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months period, if the system is not returned to service and operable, the reactor shall be brought to the hot shutdown condition within an additional 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months .

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 series with a boric acid pur.p associa-ted with the boric acid addition tank. The alternate method of boration will be the use of the makeup Tumps taking suction directly from the borated water storage tank.

(2)

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 margiri in the cold condition (200 F) at the worst time in core life with a 0

stuck control-rod assembly and after xenon decay.

8 00418 0fg r,-

Minimum volumes (including a 10? safety factor) as specified by Figure 3.2.1 6

for the boric acid addition tank or 27,633 gallons of 2270 ppm boron as boric acid solution in the borated 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 solu-tion given include the boron necessary to account for xenon decay.

The principal method of adding boron to the primary system is to pump the con-centrated boric acid solution (8700 ppm boron, minimum) into the makeup tank using the 25 gpm boric acid pumps. Using only.one of the two boric acid pumps, the required s ~ ume of boric acid can be injected in less than three hours. The alternate method of addition is to inject boric acid from the boro-ated water storage tank using the makeup pumps, the required volume of boric acid can be injected in~1 css than two hours using only one of the makeup pumps.

Concentration of boron in tha 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 suffi-ciently 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 D

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