ML17266A011

LER 78-038/01T-0 on 780925,input Error Made to ECCS Analysis Re Containment Spray Flow.Caused by Ambiguous Data Supplied by Ae.Amend to Cycle 2 ECCS Analysis Will Be Issued Shortly

ML17266A011
Person / Time
Site:	Saint Lucie
Issue date:	10/05/1978
From:	Schoppman M FLORIDA POWER & LIGHT CO.
To:
Shared Package
ML17266A010	List: ML17266A009 ML17266A011
References
LER-78-038-01T, LER-78-38-1T, NUDOCS 7810170245
Download: ML17266A011 (2)

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) The NSSS vendor erformed a reanalysis for Cycle 2 using the corrected spray pump flow. The reanalysis on this item confirms that St. Lucie 1

'oes not exceed the Appendix K limit.

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cause of the incorrectlv assumed CSP flow rate was due to ambi uous data supplied by the AE. We have reviewed the ECCS parameters for the C cle 2 reload safety analysis to ensure that all input to the anal sis is correct. An amendment to the Cycle 2 ECCS analysis will be

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REPORTABLE OCCURRENCE 335-78-38 LICENSEE EVENT REPORT PAGE TWO ADDITIONAL EYENT DESCRIPTION During review of the ECCS parameters for the Cycle 3 reload safety analysis, it was determined that an error had been made in the input to the St. Lucie ECCS analysis concerning the containment spray flow rate. The flow rate used was the value for I pump, not the required 2-pump flow rate. To evaluate the impact of this error, an analysis was performed for Cycle 2 by the NSSS vendor usinp, the corrected spray pump flow. Lhereas, the prior ECCS analyses has used reflood heat transfer coefficients derived from COHPRERC-II based upon spray pump flow of 3375 gpm and a Peak Linear Heat Generation Rate (PLHGR) of l7.0 kw/ft, the new analysis used reflood heat transfer coefficients based on a spray pump flow of 6750 gpm and the current PLHGR Technical Specification limit of 14.8 kw/ft. In each case the Peak Clad Temperature (PCT) was determined using STRIKIN-II with a PLHGR of l4.8 kw/ft and the respective reflood heat transfer coeffici-ents. The increase in reflood heat transfer coefficients resulting from thE. reduction in PLHGR from l7.0 to 14.8 kw/ft more than offset any decrease in heat transfer coefficients due to the doubling of spray pump flow. As a result the PCT calculated by STRIKIN-II decreased from the value of 2035 0 F determined for Cycle 2 to a revised value of 2022 0 F.

This completes the renalysis on this item and confirms that St. Lucje does not exceed the Appendix K limit.