ML19319D074

Tech Spec Change Request 21 Re Tech Spec 3.2,deleting Measurement Independent Quadrant Power Tilt Values from Table 3.2-2 & Adding Values to Bases for Tech Spec 3.2

ML19319D074
Person / Time
Site:	Crystal River
Issue date:	03/17/1978
From:	FLORIDA POWER CORP.
To:
Shared Package
ML19319D073	List: ML19319D072 ML19319D074 ML19319D075 ML19319D076 ML19319D077 ML19319D078 ML19319D079
References
NUDOCS 8003050849
Download: ML19319D074 (3)

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Technical Specification Change Request No. 21 (Appendix A)

Replace pages 3/4 2-11'and B 3/4 2-3 with the attached revised pages 3/4 2-11 and B 3/4 2-3.

Proposed Change Delete the Measurement Independent QUADRANT POWER TILT values from Table 3.2-2 and add them to the Bases for Specifciation 3.2.4.

Reason for Proposed Change The measurement independent values of any parameter are the safety limit values for that parameter, e.g.112% for Nuclear Overpower Trip of Reactor Protection System. As such, the measurement independent values are not a Limiting Condition for Operation, as the values for each mesurement system, i .e. , Syninetrical Incore Detector System, Power Range Channels, and Minimum Incore Detector System, are the actual Limiting i Conditions for Operations.

, l Therefore to avoid confusion and misinterpretatior , the measurement +

independent values should be deleted from the Limiting Condition for  !

Operation. However, to insure that the safety limit for the QUADRANT POWER TILT values are not lo.st, they are being added to the Bases for the QUADRANT POWER TILT.

Safety Ana. lysis Justifying Proposed Change This change has no impact on the Safety Analyses for Crystal River - Unit

3. It is.being proposed only to alleviate the potential for misinterpretation of this Specification.

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8008050 '

TABLE 3.2-2 QUADRANT POWER TILT LIMITS STEADY STATE TRANSIENT MAXIMUM LIMIT LIMIT LIMIT

. QUADRANT POWER TILT As Measured By:

Symmetrical Incore Detector System 4.01 9.51 20.0 Power Range Channels 2.04 7.04 20.0 Minimum Incore Detector System 2.82 8.32 20.0 i

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k-CRYSTAL RIVER - UNIT 3 3/4 2-11

POWER DISTRIBUTION LIMITS BASES

b. N The measurement of enthalpy rise hot channel factor, F"g, shall be increased by 5 percent to account for measurement error.

For Condition II events, the core is protected from exceeding 19.7 KW/ft locally, and from going below a minimum DNBR of 1.30 by automatic protection on power, AXIAL POWER IMBALANCE, pressure and temperature. Only conditions 1 through 3 above, are mandatory since the AXIAL POWER IMBALANCE is an explicit input to the Reactor Protection System.

The QUADRANT POWER TILT limit assures that the radial power distribution satisfies the design values used in the power capability analysis. Radial power distribution measurements are made during startup testing and periodically during power operation. For QUADRANT POWER TILT, the safety (measurement independent) limit for Steady State is 4.92, for Transient State is 11.07, and for the Maximum Limit is 20.0.

The QUADRANT POWER TILT limit at which corrective action is required provides DNB and linear heat generation rate protection with x-y plane power tilts.

The limit was selected to provide an allowance for the uncertainty associated with the power tilt. In the event the tilt is not corrected, the margin for uncertainty on Fq is reinstated by reducing the power by 2 percent for each percent of tilt in excess of the limit.

3/4.2.5 DNB PARAMETERS The limits on the DNB related parameters assure that each of the parameters are maintained within the normal steady state envelope of operation assumed in the transient and accident analyses. The limits are consistent with the FSAR initial assumptions and have been analytically demonstrated adequate to maintain a minimum DNBR of 1.30 throughout each analyzed transient.

The 12-hour periodic surveillance of these parameters through instrument readout is sufficient to ensure that the parameters are restored within their limits following load changes and other expected transient oepration.

The 18-month periodic measurement of the RCS total flow rate is adequate to detect flow degradation and ensure correlation of the flow indication channels with measured flow such that the indicated percent flow will provide sufficient verification of flow rate on a 12-hour basis.

CRYSTAL RIVER - UNIT L 3 3/4 2-3