United States Nuclear Regulatory Commission - Protecting People and the Environment


ACCESSION #: 9706300063



SIEMENS



June 26, 1997

HDC:97:062



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.



Three interim reports are enclosed for the following issues under

evaluation by Siemens Power Corporation:



     97-001    "Fraction of Power in Hot Rod for LBLOCA and SBLOCA Voided

               Core Calculations"



     97-002    "Robinson Shutdown Margin and Steam Line Break"



     97-003    "Error in Local Power Distribution and View Factors for

               Gadolinia Fuel in LBLOCA Radiation Model"



Interim report number 97-001 was previously forwarded to the NRC on June

9, 1997 with an incorrect completion date.  The correct completion date

is August 8, 1997.



If there are any questions, please contact 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 (97-001)



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 UO2 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:



August 8, 1997 (Revised from June 27, 1997)



                         Interim Report (97-002)



Subject:



Interim report of evaluation of a deviation pursuant to 10 CFR 21.21 (a)

(2)



Title:



Robinson Shutdown Margin and Steam Line Break



Identification of Basic Activity:



10 CFR 50.46 PWR ECCS Evaluation Model



Basic Activity Supplied By:



Siemens Power Corporation - Nuclear Division



Nature of Deviation:



A Steam Line Break shutdown margin requirement for a hot shutdown

condition of 1.0% delta-k/k at a boron concentration of 640 ppm does not

appear to have any documented justification.



Discovery Date:



May 20, 1997



Corrective Actions to Date:



Nonconformance report (NCR 61 25) was prepared and processed by the

management review team.  CP&L was informed of the deviation, and it has

been determined HBR has administrative procedures that limit operations

to the conservative shutdown margin conditions of 1.77% delta-k/k at

boron concentrations of 0.0 ppm used as input to the Steam Line Break

analysis.



Evaluation Completion Schedule Date:



October 31, 1997



                         Interim Report (97-003)



Subject:



Interim report of evaluation of a deviation pursuant to 1 0 CFR 21.21

(a)(2)



Title:



Error in Local Power Distribution and View Factors for Gadolinia Fuel in

LBLOCA Radiation Model



Identification of Basic Activity:



10 CFR 50.46 PWR ECCS Evaluation Model



Basic Activity Supplied By:



Siemens Power Corporation - Nuclear Division



Nature of Deviation:



SPC has discovered an error in the LBLOCA calculations for the gadolinia

fuel at Robinson and Harris.  The local peaking distribution used in the

radiation model for gadolinia fuel in Harris was non-conservative.  For

Harris and Robinson, the radiation view factors for the UO2 peak power

rod were inadvertently used for the gadolinia rods.  This is non-

conservative because the UO2 fuel rods are face-to-face with the guide

tubes, but the gadolinia rods are on the diagonal to the guide tubes

(i.e., smaller view factor for the heat sink).



Discovery Date:



May 29, 1997



Corrective Actions to Date:



Nonconformance report (NCR 6141) was prepared and processed by the

management review team.  CP&L was informed of the deviation, and it has

been determined that for both Harris and Robinson the errors are not

anticipated to cause the peak cladding temperature for the gadolinia rods

to be higher than limiting PCT for UO2 rods.



Evaluation Completion Schedule Date:



August 22, 1997



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