ML20055D403

Proposed Tech Specs Re Changes in Safety Injection Tank Min Water Inventory

ML20055D403
Person / Time
Site:	Yankee Rowe
Issue date:	06/25/1990
From:	YANKEE ATOMIC ELECTRIC CO.
To:
Shared Package
ML20055D400	List: ML20055D399 ML20055D403
References
NUDOCS 9007060269
Download: ML20055D403 (4)

Text

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REACTIVITY. sst AOL' SYSTEMS p

BORATED WATER SOURCES - SHUTDOWN LigjTING CONDITION FOR OPERATION 3.1.2.10 As a minimum, one of the following borated water sources shall be OPERABLE:

a.

The boric acid mix tank and associated heat tracing with:

4 1.

A minimum contained borated water volume of 1500 gallons, equivalent to a tank level 13.6 feet, 2.

12 to 12.5% by weight boric acid solution, and 3.

A minimum solution temperature of 150'F.

b.

The safety injection tank (SIT) with:

1.

A minimum contained borated water volume equivalent to a tank level of 225.5 feet, 2.

A minimum boron concentration of 2200 ppm, and 3.

A minimum solution temperature of 40*F.

APPLICABILITY: MODE 5.

ACTION:

With no borated water source OPERABLE, suspend all operations involving positive reactivity changes until at least one borated water source is restored to OPERABLE status.

SURVEILLANCE REOUIREMENTS

- 4.1.2.10 The above required borated water source shall be demonstrated OPERABLE:

a.

At least once per 7 days by:

1.

Verifying the boron concentration of the safety injec-tion tank water or the boric acid concentration of the l

boric acid mix tank water.

2.

Verifying the contained borated water volume of the tank,-

and l

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YANKEE-ROWE 3/4 1-19 Amendment No. #9 9007060269 900623 PDR ADOCK 05000029 p

PDC

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, REACTIVITY CONTROL SYSTEMS BORATED WATER SOURCES - OPERATING-LIMITING CONDITION FOR OPERATION 3.1.2.11 Each of the following borated water sources shall be OPERABLE:

a.

The boric acid mix tank and associated heat tracing with:

1.

A minimum contained borated water volume of 1500 gallons, equivalent to a tank level of 13.6 feet, 2.

12 to 12.5% by weight boric acid solution, 3.

A minimum solution tempel.ture of 150'F.

b.

The safety injection tank (SIT) with:

1.

A minimum contained borated water volume equivalent to a tank level of 125.5 feet, 2.

A minimum boron concentration of 2200 ppm, and 3.

A solution temperature of 120*F to 130'F.

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

' ACTION:

With'either the boric acid mix tank or the safety injection tank inoperable, provided the other required source'is OPERABLE, restore the inoperable tank 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 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 (all control rods inserted) equivalent to'at least-

.5% Ak/k at 200*F; restore the inoperable tank to OPERABLE status

,l' 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 />.-

SURVEILLANCE REQUIREMENTS 4.1.2.11 Each borated water source shall be demonstrated OPERABLE:

l 1

YANKEE-ROWE 3/4 1-21 Amendment No. 49, 92 l

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LyERGENCY CORE COOLING SYSTEMS SAFETY INJECTION TANK l

LIMITING CONDITION FOR OPERATION I

3.5.4 The safety injection tank (SIT) shall be OPERABLE with:

a.

A minimum contained borated water volume equivalent to a level of 125.5 feet.

b.

A minimum boron concentration of 2200 ppm, and c.

A water temperature of 120'F to 130'F.

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APPLICABILITY: MODES 1, 2, 3, 4* and 5*

ACTION:

With the safety injection tank inoperable, restore the tank 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 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> and'in 110T SHUTDOWN with main coolant pressure <300 psig within the following 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br />.

t SURVEILLANCE REOUIREMENTS 4.5.4 The SIT shall be demonstrated OPERABLE:

a.

At least once per 7 days by:

1.

Verifying the cor tained borated water-volume in the tank, and 2.

Verifying the boron concentration of the water, b.

At least'once pe'. 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> by verifying the SIT temperature.

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• Main coolant pressure 1300 psig.

l YANKEE-ROWE 3/4 5-12 Amendment No. #9, 59, 92

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,_EMERCENCY CORE COOLING SYSTEMS BASES ECCS SUBSYSTEMS (Continued)

With-the Main Coolant System temperature and pressure below 330'F, and 1000 psig, respectively, one OPERABLE ECCS safety injection subsystem, with the OPERABLE recirculation subsystem and the OPERABLE long term hot leg injection subsystem, is acceptable without single failure consideration on the basis of the stable reactivity condition of the reactor, the decreased probability of a LOCA and'the limited core cooling requirements because of the negligible energy stored in the primary coolant under these conditions.

i The Surveillance Requirements provided to ensure OPERABILITY of each component ensures that, at a minimum, the assumptions used in-the safety anclyses are met and that subsystem OPERABILITY is maintained.

g Complete system tests cannot be performed when the reactor is operating because of their inter-relatioa with operating systems. The method of assuring operability of these systems is a combination of complete system tests performed during refueling shutdowns and monthly tests of active system components (pumps and valves) during reactor operation. The test interval is based on the judgement that more frequent testing would not significantly increase reliability.

Some subsystems power operated valves fail to meet single failure criteria and removal of power to these valves is required.

In order to eliminate potential for reactor vessel low temperature overpressurization by the inadvertent-operatJ~1 of ECCS pumps,-the pump circuit breakers are opened and locked in the racked-out position or removed from the breaker cubicles. Also selected SIS isolation valves are positioned to remove the possibility of an overpressurization event during that portion of MCS heatup and cooldown when an inadvertent injection could result in an overpressure event.

3/4.5.4 SAFETY INJECTION TANK The OPERABILITY of the Safety Injection Tank (SIT) as part of the ECCS ensures that a sufficient supply of borated water is available for injection by the ECCS in the event of a LOCA. The limits on SIT minimum level and l

boron concentration ensure that - 1) suf ficient water is available within L

containment to permit recirculation cooling flow to the core, and 2) the reactor will remain suberitical in the cold condition f ollowing mixing of the SIT and the Main Coolant System water volumes with all control rods inserted except for the most reactive control assembly. These assumptions are consistent with the LOCA analyses, which is based on allowing a minimum I

of 77,000 gallons to be injected by the safety injection subsystems before

,the recirculation is manually established.

LOCA analyses show that an injection of 77,000 gallons is sufficient to limit core temperatures and containment pressure for the full spectrum of pipe ruptures This leaves up to 52,000 gallons in the SIT ss reserve.

The boron concentration of l

2200 ppm is the highest value assumed in any accident analysis.

The SIT i

water temperature of 120'F to 130'F ensures that the reactor vessel is not L

subjected to conditions that could exceed the NDT provisions of the ASME Code af ter a severe transient.

YANKEE-ROWE'

,B 3/4 5-2 Amendment No. 52, 59, 92, XXX

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