ML20134J995

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South Tx 1 Fuel Assembly Insp Program
ML20134J995
Person / Time
Site: South Texas STP Nuclear Operating Company icon.png
Issue date: 09/11/1996
From: Colburn D, Desiree Davis, Halligan J
WESTINGHOUSE ELECTRIC COMPANY, DIV OF CBS CORP.
To:
Shared Package
ML17062B149 List:
References
PPE-96-219, NUDOCS 9611180177
Download: ML20134J995 (28)
v • d • e


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d Westhsghouse Propdetary Cle3s 3 4

South Texas 1 Fuel Assembly inspection Program Contributors:

D. J. Colburn D. D. Davis J. R. Halligan A. S. Konzel H. Kunishi September 11,1996 Inspection work was conducted at South Texas Unit 1 by an NSD crew under the direction of PPE gi 2

_ en_ neer John Bury. The inspections were performed between July 10,1996 and July 26,199,6. _

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The responsibility for the reduction and verification of individual portions of the inspection program ,

' was assigned to various PPE engineers. Their signatures on this document attest that (1) they i have independently verified the sections assigned to them; and (2) they concur with the results documented herein. A listing of the individual data reduction and verification assignments is given  ;

below:

Insnection Program Section Originating Engineer Verifvino Enaineer 1.0 - Background & Objectives D. Colburn J. Halligan 2.0 Full Length RCCA Drag Tests D. Coltern D. Davis 3.0 Guide Thimble Plug Gage Exams D. Colburn J. Halligan 4.0 Guide Thimble Borescope Exams D. Colburn D. Davis 5.0 F/A Length Measurements H. Kunishi A. Konzel 6.0 Fuel Rod Growth Data H. Kunishi A. Konzel 7.0 Fuel Assembly Bow Data D. Davis D. Colburn 8.0 Overall Summary D. Colburn D. Davis Signatures On File D. J. Colburn D. D. Davis Product Performance Engineering Product Performance Engineering H. Kunishi A. S. Konzel Product Performance Engineering Product Performance Engineering 9611180177 961016 PDR TOPRP EMVWEST B PDR J. R. Halligan Product Performance Engineering 1

ppe-96-249,c8 ppe-96-219

W.stinghous) Proprietary Class 3 1.0 Background and Objectives An RCCA insertion anomaly was experienced at Wolf Creek and South Texas Unit 1.

During SCRAMS, several RCCAs did not fully insert. Both plants conducted additional drop tests after the anomaly, and additional RCCAs did not fully insert. A subsequent inspection

_ program _ concluded.that thejirect.cause otthe incomplete.RCCA. insertions.at Wolf _ Creek .a,b,e The following tests were scheduled to be conducted during the inspection program:

(1) RCCA Drag Tests; (2) Guide Thimble Plug Gage Exams (Single Tube Probe Tests),

(3) Fuel Assembly Length Measurements; (4) Fuel Assembly Bow Measurements (5) Fuel Rod-to-Nozzle Gap Measurements; and (6) Borescope inspection.

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Fuel assembly length measurements and fuel rod-to-nozzle gap measurements were needed I

to determine if the growth of the fuel assemblies and fuel rods was within the anticipated l range. I 2.0 Full Length RCCA Drag Tests (Spent Fuel Pool) l i

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W;stinghou3s Propriet:ry Cla:s 3 a,b,c I

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Table 2.1: Fuel Features of South Texas Unit 1 17x17 Fuel i

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_ _ . . . _ _ . South Texas Unit 1 Drag Test Data 1

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Wes shous2 Protwietwy CArss 3 Figure 2.1: South Texas 1 Dashpot and Upper Guide Thimble Drag Data F-a,b,c i

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Figure 2.2: South Texas 1 Dashpot Drag and Fast Fluence Data i

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Westinghous2 Proprietary Cle:s 3 3.0 Single Tube Probe Single tube probing was conducted on eleven fuel assemblies at South Texas Unit 1.

= Assembly burnup and drag test results were used to select the assemblies (Table 3.1) The a,b,e I

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Westinghouse a -anvietary Cher 3 Table 3.1: Single Tube Probe Test Results a,b,c ,

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5.0 Fuel Assembly Growth Data Fuel assembly length measurements were performed on a total of 24 assemblies (3

.assemb ies frorn Region _C, 2_assernblies_from Region E,1_7 a.ss_embli_es fro.m Region F _and_,,,,,

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Westhghous2 Propriet:ry Cin:s 3 Figure 5.1: Recent AssemblyGrowth Data

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6.0 Fuel Rod Growth Data

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The axial gaps between the peripheral rods and the assembly nozzles were measured from the low magnification TV tapes of 9 South Texas Unit 1 assemblies to determine fuel rod growth.

The assemblies were C28, E10, E31, F26, F32, F37, F41, R27 and R31.

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w:stinghous, proprietary class 3 8.0 Summary

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_The_ growth of the fuel assemblies and fuel rods measured at South Texas Unit 1 is consistent _

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Appendix D 5 Fuel Assembly Bow Data i

for South Texas 1 i

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Westinghous2 Propdetery Cle:s 3 Figure D.3: South Texas 1 Fuel Assembly F37 Bow Data - Direct View

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Figure D.4: South Texas 1 Fuel Assembly F41 Bow Data - Direct View a,b,c I

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