ML20092G658

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Proposed Ts,Amending Appendix a Increasing Upper Limit of Maximum Boron Concentration in Bwst to 3,000 Ppm,Revising TS 3.1.2.9 & 3.5.4 & TS Bases 3/4.1.2 & 3/4.5.4
ML20092G658
Person / Time
Site: Crystal River Duke Energy icon.png
Issue date: 02/13/1992
From:
FLORIDA POWER CORP.
To:
Shared Package
ML20092G622 List:
References
NUDOCS 9202200265
Download: ML20092G658 (5)
v • d • e


Text

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FLORIDA POWER CORPORATION CRYSTAL RIVER UNIT 3 DOCKET H0. 50-302/ LICENSE NO. DPR-72 REQUEST NO. 194, REVISION 0 BORATED WATER SOURCES OPERATING LICENSE DOCUMENT INVOLVED: Technical Specifications PORTIONS: Specification 3.1.2.9, Page 3/4 1 16 Specification 3.5.4, Page 3/4 5 7 Specification Bases 3/4.1.2 Page B 3/4 1-3 Specification Bases 3/4.5.4, Page B 3/4 5 3 DESCRIPTION OF REQUEST:

This request increases the maximum boron concentration in the Borated Water Storage Tank (BWST) during operation from 2,450 ppm to 3,000 ppm.

REASON FOR REQUEST:

Crystal River Unit 3 (CR-3) refueling canal water and the reactor coolant system (RCS) boron concentrations are typically maintained in the range of 2,450 ppm to 3,000 ppm to assure an increased measure of subcriticality with the control rods removed during shutdown conditions. Upon completion of refueling, the RCS and the BWST must be deborated to a boron concentration of s 2,450 ppm before entering Mode 4. Increasing the allowable BWST boron concentration to'3,000 ppm would permit the direct transfer of refueling canal water to the BWST without deboration. This direct transfer will reduce the CR-3 outage time.

EVALUATION OF REQUEST:

The minimum BWST boron concentration ensures that the reactor remains subcritical in the cold condition following the mixing of the BWST and RCS water volumes.

The maximum concentration ensures that boron precipitation does not occur during the long term cooling period following a LOCA. The boron limits both ensure that the solution in the Reactor Building Emergency Sump following a LOCA has a pH of at least 7.0 prior to recirculation of the sump. Thi:: pH limit will minimize the evolution of iodine and minimize the effects of corrosion on the components in the Reactor Building. The BWST boron concentration range presently permitted for CR-3 is between 2,270 ppm and 2,450 ppm.

The minimum BWST boron concentration is not changing with this request. The boron concentration necessary to create the conditions necessary to allow the possibility of precipitation is greater than 40,000 ppm at 212'F. In the long term cooling period following a LOCA, analyses have shown that the maximum concentration in the reactor vessel will not exceed 10,000 ppm under the worst case. Therefore, an increase in the upper limit of the BWST concentration to 3,000 ppm is acceptable. Analyses have been performed that show that a boron concentration of 3000 ppm in combination with 1600 ppm trisodium phosphate dodecahydrate (TSP C) (buffering agent in the storage containers located on the 95 ft elevation of the Reactor Building) will increase the RCS/BWST solution in the Reactor Building Emergency Sump to a pH of at least 7.0.

9202200265 920213 PDR ADOCK 05000302 P pgg

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O REACTIVITY CONTROL SYSTEMS BORATED WATER SOURCES OPERATING LIMITING CONDITION FOR OPERATION 3.1.2.9 Each of the following borated water sources shall be OPERABLE

a. A concentrated boric acid storage system and associated heat tracing with:
1. A minimum contained borated water volume of 6,000 gallons,
2. Between 11,600 and 14,000 ppm of boron, and
3. A minimum solution temperature of 105'F.
b. Theboratedwaterstorage_ tank (BWST)with:
1. A minimum contained borated water volume of 415,200 gallons,
2. Between 2,270 and 3,000 ppm of boron, and l
3. A minimum solution temperature of 40'F.

APPLICABILITY: MODES 1, 2, 3,.and 4.

ACTION:

a. With the concentrated boric acid storage system inoperable, restore the storage 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 in at least il0T STANDBY and borated to a SHUTDOWN' MARGIN equivalent to 1%

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 concentrated boric acid storage system to OPERABLE 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 borated water storage 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 />.

CRYSTAL RIVER --UNIT-3 3/4 1-16 Amendment.Nos.!B, 15, 20,'32r 4, 54, 77, SS, L . . . . . . . . ..

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1 The limit established for minimum boron concentration is based upon ensuring that with a minimum BWST level following a LOCA, the reactor will remain subcrtt' cal in the cold condition following mixing of the DWST and RCS water volumes. Large break LOCAs assume all control rods remain withdrawn from the core.

The minimum and maximum boron concentration limits both ensure that the solution in the reactor building emergency sump following a LOCA is within a pH range of 7.0 to 11.0 prior to recirculating the solution through the low pressure injection system and the reactor building spray system. This pH range wt11 minimize the evolution of iodine and minimize the effects of chloride and caustic stress corrosion cracking on the mechanical systems and components within the reactor building.

The maximum boron concentration in the BWST is also based on the potential for boron precipitation in the core during the long term cooling period following a LOCA. BWST boron concentrations in excess of the limit could result in precipitation earlier than assumed in the analyses.

The OPERABILITY of one boron injection system during REFUELING ensures that this system is available for reactivity control while in Mode 6.

3/jk]23 MOVABLE CONTROL ASSEMBLIES The specification of this section (1) ensure that acceptable power distribution limits are maintained. (2) ensure that the minimum SHUIDOWN MARGIN is maintained, and (3) limit the potential effect of a rod ejection accident. OPERABILITY of the control rod position indicators is required to determine control rod positions and thereby ensure compliance with the control rod alignment and insertion limits.

The ACTION statements which permit limited variations form the basic requirements are accompanied ny additional restrictions which ensure that the original criteria are met. For example, misalignment of a safety or regulating rod recuires a restriction in THERMAL POWER. The reactivity worth of a misaligned rod is limited for the remainder of the fuel cycle to prevent exceeding the assumptions used in the safety analysis.

The position of a rod declared inoperable due to misalignment should not be included in computing the average group position for determining the OPERADILITY of rods with lesser misalignments.

CRYSTAL RIVER - UNIT 3 B 3/4 1-3 Amendment Nos. M, 32, %,

0 o

EMERGENCY CORE COOLING SYSTEMS BORATED WATER STORAGE TANK LIMITING CONDITION FOR OPERATION 3.5.4 The borated water storage tank (BWST) shall be OPERABLE with:

a. - A contained treated water volume of between - 415,200 and 449,000 gallons,
b. Between 2,270 and 3,000 ppm of boron, and l
c. -A minimum water temperature of 40'F.

APPLICABillTY: MODES 1, 2, 3, and 4.

ACTION:

With the-borated water storage 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 />.

SURVElllANCE REQUIREMENTS 4.5.4 The BWST shall be demonstrated OPERABLE:

a. At least Once per 7 days by:
1. Verifying the contained borated water volume in the tank,
2. Verifying the boron concentration of the water,
b. At least once per 24 -hours by verifying the water temperature when outside air temperature is less than 40*F..

CRYSTAL RIVER. ' UNIT 3 3/4 5-7 Amendment No.

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EMERGENCY CORE COOLING SYSTEMS BASES BORATEDWATERSIGRAGETANK(Continued) 1 The contained water volume limit includes an allowance for water not usable because of tank discharge line location or other physical characteristics. The limits on contained water volume and boron concentration ensure a pH value of between 7.0 and 11.0 of the solution sprayed within the containment after a l design basis accident. The pH band minimizes the evolution of iodine and minimizes the effect of chloride and caustic stress corrosion cracking on the mechanical systems and components.

CRYSTAL. RIVER - UNIT 3- B 3/4 5-3' Amendment Nos. W ,

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