ML20099C836

Proposed Tech Specs Defining Required Shutdown Margin for Modes 3,4 & 5,in Terms of RCS Boron Concentration

ML20099C836
Person / Time
Site:	Summer
Issue date:	03/06/1985
From:	SOUTH CAROLINA ELECTRIC & GAS CO.
To:
Shared Package
ML20099C815	List: ML20099C812 ML20099C836
References
NUDOCS 8503110443
Download: ML20099C836 (3)

Text

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REACTIVITY CONTROL SYSTEMS SHUTDOWN MARGIN - MODES 3, 4 AND 5 k-I LIMITING CONDITION FOR OPERATION 3.1.1.2 The SHUTDOWN MARGIN shall be greater than or equal to 2.0% delt: k/k. I j TTHC LIM tTS SnoWN \M APPLICABILITY: MODES 3, 4 and 5. p g ,,, 3,3_3, l ACTION: l 3 Tus nouse vAus With the SHUTDOWN MARGIN less than .. ... -,o,'immediately initiate and continue boration at greater than or equal to 30 gpa of a solution containing greater than or equal to 7000 ppe boron or equivalent until the required SHUTDOWN MARGIN is restored.

a SURVEILLANCE REQUIREMENTS 4.1.1.2 The SHUTDOWN MARGIN shall be determined to be greater than or equal to 2.0% delt: k/k: Ttts acouu co vAws:

a. Within one hour after detection of an inoperable control rod (s) and at least once per 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> thereafter while the rod (s) is inoperable.

(. If the inoperable control rod is immovable or untrippable, the SHUTDOWN MARGIN shall be verified acceptable with an increased

allowance for the withdrawn worth of the immovable or untrippable control rod (s).

b. At least once per 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> by consideration of the following factors:

1. Reactor coolant system boron concentration, t

, 2. Control rod position,

3. Reactor coolant system average temperature,

4. Fuel burnup based on gross thermal energy generation,

5. Xenon concentration, and

6. Samarium concentration.

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8503110443 850306 PDR ADOCK 05000395 P_ PDR

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E O 'NIDHYW NMOGJ,DHS G2HIOUilH Mv .

3/4.1 REACTIVITY CONTROL SYSTEMS BASES 3/4.1.1 B0 RATION CONTROL 3/4.1.1.1 and 3/4.1.1.2 SHUTDOWN MARGIN A sufficient SHUTDOWN MARGIN ensures that 1) the reactor can be made subcritical from all operating conditions, 2) the reactivity transients associated with postulated accident conditions are controllable within acceptable limits, and 3) the reactor will be maintained sufficiently subcritigal to preclude inadvertent criticality in the shutdown condition.

SHUTDOWN MARGIN requirements vary throughout core life as a function of fuel depletion, RCS boron concentration, and RCS T,yg. In MODES 1 and 2 the most restrictive condition occurs at EOL, with T,yg at no load operating temperature, and is associated with a postulated steam line break accident and resulting uncontrolled RCS cooldown. In the analysis of this accident, a minimum SHUTDOWN MARGIN of 1.77 percent delta k/k is required to control the reactivity transient. Accordingly, the SHUTDOWN MARGIN requirement is based upon this limiting condition and is consistent with FSAR safety analysis

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assumptions. In MODES 3, 4 and 5 the most limiting accident is a boron dilution accident. A 2 percer.t dNta k/k SHUTDOWN MARGIN providejf adequate protection in these MODES. I L s yyy s , as a ruscrio u or asisa33c i

3/4.1.1.3 MODERATOR TEMPERATURE COEFFICIENT The limitations on moderator temperature coefficient (MTC) are provided to ensure that the value of this coefficient remains within the limiting condition assumed in the FSAR accident and transient analyses. -

The MTC values of this specification are applicable to a specific set of plant conditions; accordingly, verification of MTC values at conditions other than those explicitly stated will require extrapolation to those conditions in order to permit an accurate comparison.

The most negative MTC value equivalent to the most positive moderator density coefficient (MDC), was obtained by incrementally correcting the MDC used in the FSAR analyses to nominal operating conditions. These corrections SUMMER - UNIT 1 B 3/4 1-1

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