ML20148U518
| ML20148U518 | |
| Person / Time | |
|---|---|
| Issue date: | 07/02/1997 |
| From: | Craig C NRC (Affiliation Not Assigned) |
| To: | Matthews D NRC (Affiliation Not Assigned) |
| References | |
| PROJECT-700 NUDOCS 9707100202 | |
| Download: ML20148U518 (54) | |
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41 UNITED STATES g
g NUCLEAR REGULATORY COMMISSION o
f WASHINGTON, D.C. 20666 4001 i
%,.....p July 2, 1997 MEMORANDUM T0: David B. Matthews, Chief Generic Issues and Environmental Projects Branch Division of Reactor Program Management Office of Nuclear Reactor Regulation i i]
FROM:
C1audia M. Craig, Senior Project Manage 9.. o A s
Generic Issues and Environmental Projects Branch i
Division of Reactor Program Management Office of Nuclear Reactor Regulation
SUBJECT:
SUMMARY
OF MEETING WITH WESTINGHOUSE TO DISCUSS MECHANICAL MODEL ASSOCIATED WITH THE INCOMPLETE R0D CLUSTER CONTROL ASSEMBLIES (RCCA) IN3ERil0N ISSUE The subject meeting was held at the Nuclear Regulatory Commission (NRC) offices in Rockville, Maryland on June 17, 1997, between representatives of Westinghouse and the NRC staff.
The meeting was held for Westinghouse to continue discussions on.the additional work performed with the mechanical i
model developed for the incomplete RCCA insertion issue. Attachment 1 is a list of meeting participants. Most of the meeting was closed to the public due to the proprietary nature of the information being discussed.
By letter dated June 13, 1997, Westinghouse provided both proprietary and non-proprietary versions of the material presented at the meeting. Attachment 2 is a copy of the non-proprietary version of the presentation material.
Westinghouse provided the results of the sensitivity studies performed to determine bow sensitivity to oxide and bow / growth sensitivity to power history. Westinghouse described the results of calculating the fuel assembly
/
bow impact on drag compared to the measured value.
The results of
/
benchmarking the model against data from South Texas were also discussed.
Westinghouse provided the staff with further details of the mechanical model.
Westinghouse drew a number of conclusions related to the thimble bow / drag, fuel assembly growth, holddown spring loads, and grid drag loads.
0 Westinghouse described what actions are being taken for fuel already in reactors and for future reloads.
For operating fuel, Westinghouse is performing an analysis to determine what fluence /burnup leads to a specified drag. Westinghouse is also performing neasurements after they reach that limit and determining what specific features impact incomplete RCCA insertion.
Westinghouse is performing similar activities with regard to future reloads and is determining the 95/95 confidence level.
Westinghouse also discussed proactive actions to address incomplete rod insertion for a number of plants.
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9707100202 970702 PDR TOPRP ENVWEST C
D. Matthews July 2, 1997 Westinghouse plans to submit-a topical report containing the mechanical model 4
and describing the work discussed in the meetings. The topical report should be submitted in the near future. Westinghouse indicated that review of the topical is considered to be Westinghouse's top priority.
Project No. 700 Attachments: As stated cc w/atts:
See next page DISTRIBUTION:
See attached page i
DOCUMENT NAME:
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6 DISTRIBUTION w/ attachments:
Surmary of June 17, 1997, meeting with Westinghouse dated July 2.1997
'. Central File I
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PGEB R/F RArchitzel CCraig E-Mail SCollins/FMiraglia
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GHolahan BSheron JLyons MChatterton HScott, RES H0rnstein, AE00 HConrad FGrubelich 4
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Mr. Nicholas J. Liparulo Westinghouse Electric Corporation Mail Stop ECE 4-15 P.O. Box 355 Pittsburgh, PA 15230-0355' Mr. Henry A. Sepp Westinghouse Electric Corporation Mail Stop ECE 4-07A P.O. Box 355 Pittsburgh, PA 15230-0355 Mr. Andrew Drake, Troject Manager Westinghouse Owners Group Mail Stop ECE 5-16 P.O. Box 355 Pittsburgh, PA 15230-0355 i
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WESTINGHOUSE / NRC MEETING
, MECHANICAL MODEL UPDATE FOR THE INCOMPLETE RCCA INSERTION ISSUE JUNE 17, 1997 l
MEETING PARTICIPANTS N8M1 ORGANIZATION Claudia Craig NRC/NRR/PGEB V. F. Esposito Westinghouse /CNFD H.F. Conrad NRC/NRR/DE/EMCB Harold H. Scott NRC/RES/ DST.
Muffet Chatterton NRC/NRR/SRXB H.L. Ornstein NRC/AE00 Howard Menke Westinghouse /CNFD James Reavis Westinghouse /CNFD Rick Kohrt Wisconsin Electric /WOG Mike Schoppman Florida Power & Light Francis T. Grubelich NRC/NRR/EMEB ATTACHMENT 1
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Westinghouse Proprietary Class 2 o;
i Incomplete RCCA Insertion l
l Program Status i
NRC Meeting l
June 17,1997 l
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Westinghouse Proprietary Class 2 Agenda i
Bow Sensitivity to Oxide j
f Bow / Growth Sensitivity to Power History i
Fuel Assembly Bow Impact on RCCA Drag t
South Texas - Model Benchmark Results Impact of. Lower Span Drag on Upper Span Drag Wolf Creek Model Renormalization j
Model Presentation i
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Westinghouse Proprietary Class 2 Bow Sensitivity to Oxide Growth and Bow vs. Relative Time - Span 6 (Zircaloy & ZIRLO) l 1
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Westinghouse Proprietary Class 2 Bow Sensitivity to Oxide ZIRLO Growth and Bow vs. Oxide Thickness - Span 6 aJp 0
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Bow Sensitivity to Oxide Zircaloy 4 Growth and Bow vs. Oxide Thickness - Span 6 g
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WESTlHGHOUSE PROPRIETAlWClASS 2 Power History Sensitivity Ground Rule:
Burnup is conserved @ 50,000 to determine allowable power histories (P1,P2,P3)
Example:
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Westinghouse Proprietmy Class 2 Bow! Growth Sensitivity to Power History Assembly Growth vs. Power History 8
Westinghouse Proprietary Class 2 Fuel Assembly Bow Impact on RCCA Drag Calculations & Assumptions OT 9
Westinghouse Proprietary Class 2 Fuel Assembly Bow Impact on RCCA Drag Calculations & Assumptions 8 39 1
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WESTillGIIOUSE PROPRIETARY Cl Ars 7 Mechanical Model Applied to South Texas
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Westinghouse Proprietary Class 2 South Texas - Model Benchmark Results Measured vs. Predicted Assembly Growth g
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Westinghouse Proprietary Class 2 South Texas - Model Benchmark Results Measured vs. Predicted Total Drag Q
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Westinghouse Proprietary Class 2 South Texas - Model Benchmark Results Measured vs. Predicted Upper Span Drag ay 16
Westinghouse Proprietary Class 2 South Texas - Model Benchmark Results Measured vs. Predicted Dashpot Drag g
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Model Presentation Thimble Growth and Bow Model Calculation Schematic i
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WESTINGHOUSE PROPRIETARY CIASS 2 Proactive Actions to Address IRI l
Recommend use of ZIRLO for Skeleton especially for high temperature plants and P-grids South Texas : ZIRLO guide thimble,P-grids (Fall '97)
Introduction of Thicker Guide Thimble Wolf Creek 8 LTA: ZIRLO Skeleton 4
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Proactive Actions to Adress IRI Additional Field Data and PIE Praire Island:
Oxide measurement, drag test, length, ZIRLO Inst Tube to Hot Cell North Anna :
Drag tests / length / oxide measurment South Texas : Drag tests / length / oxide VC Summer : ZIRLO skeleton to hot cell (high Bup)
Redesign of Double Dashpot First application in '98 in Europe
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