ML17340B149

LER 79-033/01T-0:on 791101,NSSS Vendor Identified & Corrected Input Error in Two LOCA Analyses.Caused by Use of Incorrect Method.Procedures Revised

ML17340B149
Person / Time
Site:	Turkey Point
Issue date:	11/15/1979
From:	Schoppman M FLORIDA POWER & LIGHT CO.
To:	FLORIDA POWER & LIGHT CO.
Shared Package
ML17340B144	List: ML17340B143 ML17340B145 ML17340B146 ML17340B147 ML17340B148 ML17340B149
References
LER-79-003-01T, LER-79-3-1T, NUDOCS 8105050087
Download: ML17340B149 (2)

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so LP'ENT OSSCRIPTIQN rLNO PROSArSI S CONSRCUGi4CSS Qlo The NSSS vendor has identified and corrected an in ut error in each of two

~o2 A i nn 'bl t Ir Pi n 'he LOCA anal ses for the 22K and the 25/ steam enerator tube lu in 'evels

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'REPORTABLE OCCURRENCE 250-/9-33 LICENSEE EVENT REPORT PAGE T!l0 Additional Cause Descri tion and Corrective Actions:

There are two methods which utilize pressure drops for input to SATAN computer

.code calculations. One is a standard technique and the other is used for tube plugging analyses when only the tube plugging input is changed. steam'enerator Since the 22X analvsis involved an updated hot assembly flow area input to SATAN (unrelated to tube plugging), the first method should have been used.

However, since the 22K analysis was a "tube plugging" analvsis, the second method was inadvertently used.

eolith respect to the 2SX analysis, a value for power in the hot assembly that was input to the SATAN calculation was 3/ too low.

In order to assure that a similar error will not occur in the future, the following revisions to the NSSS v'endor's procedures are being implemented.

a. Automated cross checks of current input data with those of a previous analysis (or analysis for a similar olant) will be requir ed (while it is now only recommended).

Safeguards Engineering Standards dealing with SATAN pressure drops will be revised to include a cautionary sta tement about the impact of data changes on the methods used.

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c. A standard for steam generator tube plugging analysis will be written.