United States Nuclear Regulatory Commission - Protecting People and the Environment


ACCESSION #: 9706120266



SIEMENS



June 9, 1997

HDC:97:051



Document Control Desk

ATTN: Chief, Planning, Program and Management Support Branch

U.S.  Nuclear Regulatory Commission

Washington, D.C. 20555



Interim Report of Evaluation of a Deviation Pursuant to 10 CFR

21.21 (a)(2)



The following information is provided pursuant to the requirements of 10

CFR 21 to submit an interim report on issues that will not be completed

within 60 days of discovery.



An interim report is enclosed for the following issue under evaluation by

Siemens Power Corporation:



     "Fraction of Power in Hot Rod for LBLOCA and SBLOCA Voided Core

     Calculations"



If there are any questions regarding this issue, please contact Mr.  Rich

Gottula at (509) 375-8221 or me.



Very truly yours,



H. Donald Curet, Manager

Product Licensing



/smg



Enclosure



cc:  E. Y. Wang (NRR/DRPM/PECB)



Siemens Power Corporation



Nuclear Division         2101 Horn Rapids Road    Tel: (509) 375-8100

Engineering &

Manufacturing            P.O. Box 130             Fax: (509) 375-8402

                         Richland, WA 99352-0130



                             Interim Report



Subject:



Interim report of evaluation of a deviation pursuant to 10 CFR

21.21(a)(2)



Title:



Fraction of Power in Hot Rod for LBLOCA and SBLOCA Voided Core

Calculations



Identification of Basic Activity:



10 CFR 50.46 PWR ECCS Evaluation Model



Basic Activity Supplied By:



Siemens Power Corporation - Nuclear Division



Nature of Deviation:



The fraction of the power deposited in the hot rod under voided core

conditions may be non-conservative



Discovery Date:



April 21, 1997



Corrective Actions to Date:



Nonconformance report (NCR-6090) prepared and processed by management

review team as required by SPC-ND's Quality Assurance Manual, EMF-1.

Analyses have been performed which demonstrate that the fraction of power

deposited in UO sub 2 fuel rods under voided core conditions is

conservative, but the fraction of power deposited in gadolinia bearing

fuel rods may be non-conservative.  Calculations for gadolinia bearing

fuel rods are in progress to verify 10 CFR 50.46(b) criteria are

satisfied.  This issue is judged not to be a substantial safety hazard.



Evaluation Completion Schedule Date:



June 27, 1997



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