ML17300B014

Forwards Fuel Assembly Guide Tube Wear Program for Review & Approval.Application Fee Also Remitted to NRC

ML17300B014
Person / Time
Site:	Palo Verde
Issue date:	08/20/1987
From:	Haynes J ARIZONA PUBLIC SERVICE CO. (FORMERLY ARIZONA NUCLEAR
To:	NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM)
References
161-00453-JGH-S, 161-453-JGH-S, TAC-66036, NUDOCS 8708260257
Download: ML17300B014 (8)

Text

I t REGULATORY INFORNATION DISTRIBUTION SYSTEN (R IDB >

ACCESSION NBR'8708260257 DOC. DATE: 87/08/20 NOTARIZED: NO DOCKET 5 FACIL: STN-50-529 Palo Verde Nuclear Stations Unit 2i Arizona Pub AUTH. NANE AUTHOR AFFILIATION li 05000529 HAYNES'. G. Arizona Nuclear PoUjer Prospect (formerly Arizona Public Sel v RECIP. NANE RECIPIENT AFFILIATION Document Control Branch (Document Control Desk)

SUBJECT:

Formards fuel assembly guide tube wear program for revieUJ 8c approval. Application fee also remitted to NRC.

DISTRIBUTION CODE: A001D TITLE: OR COPIES RECEIVED: LTR Submittal: General Distribution i ENCL J SIZE:

NOTES: Standal dized plant. N. Davis'RR: 1Cy. 05000529 RECIPIENT COPIES RECIPIENT COPIES ID CODE/NANE LTTR ENCL ID CODE/MANE LTTR ENCL PD5 LA 1 0 PD5 PD 5 5 LICITRAs E 1 1 DAVIS> N 1 1 INTERNAL: ACRB 6 6 ARN/DAF/LFNB 1 0 NRR/DEST/ADB 1 NRR/DEBT/CEB 1 1 NRR/DEBT/MTB 1 1 NRR/DEBT/RBB 1 1 NRR/DOEA/TSB 1 ILRB 1 OGC/HDS1 1 0 REG FILE 01 1 1 RES/DE/EIB 1 1 EXTERNAL: EG8tG BRUSKEi S 1 1 LPDR NRC PDR 1 NSIC NOTES: 1 1 TOTAL NUMBER QF COPIES REQUIRED: LTTR 29 ENCL 26

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Arizona Nuclear Power Project P.o. BOX 52034 ~ PHOENIX, ARIZONA 85072-2034 August 20, 1987 161-00453-JGH/SGB U. S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, D. C. 20555

Subject:

Palo Verde Nucl'ear Generating Station (PVNGS)

Unit 2 Docket No. STN 50-529 (License NPF-51)

Fuel Assembly Guide Tube Wear Program for PVNGS Unit 2 File: 87-C-056-026 87-001-419.15

Reference:

Letter from E. E. Van Brunt, Jr. (ANPP) to G. W. Knighton (NRC) dated August 12, 1985.

Subject:

Guide Tube Wear Surveillance, (ANPP-33200).

Dear Sirs:

Attached to this letter is the Fuel Assembly Guide Tube Wear Program for PVNGS Unit

2. This program is being submitted for your review and approval.

In accordance with the requirements of 10 CFR 170.12(e), an application fee of

$ 150.00 is being forwarded to the USNRC License Fee Management Coordinator.

By copy of this letter, we are also forwarding the proposed program to the appropriate state agency.

If you have any questions, please contact Mr. W. F. Quinn of my staff.

Very truly yours,

) c.u~

J. G.."Haynes Vice President Nuclear Production JGH/SGB/ls Attachment cc: 0. M. De Michele E. E. Van Brunt, Jr.

G. W. Knighton w/a E. A. Licitra M. Davis G. Fiorelli A..C. Gehr C. E. Tedford R. M. Diggs (with WFD $ 150) 87082' 0 >7 870820 PDP ~DOCK p 050OOSp9 pan

PVNGS Unit 2 Fuel Assembl Guide Tube GTWP

==

Introduction:==

Fuel assembly guide tube wear was identified as a concern in the Safety Evaluation Report of the Combustion Engineering Standard Safety Analysis Report System 80 (NUREG-0852), and in the Safety Evaluation Report and Supplemental Safety Evaluation Reports (SSER) for PVNGS (NUREG-0857).

PVNGS has committed to perform a GTWP during the Unit 1 first End of Cycle (EOC) outage. In addition, SSER 5, Section 4.2.5, requested that this same program be implemented during the Unit 2 first EOC outage. This request was based upon "the NRC staff's practice to require supplemental surveillances related to significant design changes in the first two plants incorporating such new features".

By a letter dated August 12, 1985, from E. E. Van Brunt, Jr. (ANPP), to G. W.

Knighton (NRC), PVNGS has committed to perform a G'QV during the Unit 2 first EOC outage. It was stated within this letter that the scope of the Unit 2 GTWP would be defined upon completion of the Unit 1 wear program and subsequent data analyses.

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DESCRIPTION OF TEST PROGRAM:

Measurements of guide tube wear will be performed on fuel assemblies, four guide tubes per assembly, by an experienced nuclear vendor [e.g. Combustion Engineering, Inc. or Advanced Nuclear Fuels Corp. (formerly Exxon Nuclear)]. The number of assemblies to be tested will be dependent upon the,PVNGS Unit 1 first EOC guide tube wear data analysis.

Quantitative measurements of guide tube wear will be performed in the spent fuel pool using nondestructive eddy-current testing techniques developed specifically for this purpose.

The nondestructive eddy-current test is performed by inserting a bobbin several feet into the top of each guide tube and then withdrawing the coil at a constant speed.

Data is collected as the coil is withdrawn. Volumetric variations in wall thickness are detected by comparison with data obtained from characterized standards. The vendor's database of guide tube wear measurement results from PVNGS Unit 1 and other plants, will also be used for comparison and interpretation of test results.

The eddy-current testing will be performed in the spent fuel pool, rather than in the reactor vessel prior to movement to the spent fuel pool. Performing the test in the spent fuel pool during the fuel shuffle will reduce the Unit 2 EOC outage duration.

SAMPLE SIZE:

Sample size will be based upon the Unit 1 first EOC guide tube wear test results.

SELECTION OF ASSEMBLIES TO BE TESTED:

Selection of assemblies will thoroughly sample the various Control Element Assembly (CEA) finger configurations while concentrating on locations with the highest probability of wear. The assemblies to be tested will include those that have resided under 12 finger and 4 finger CEA's during Cycle 1. Selection will also be dependent upon Unit 1 guide tube wear test results.

I The vendor's QA program for field testing services will be utilized.

REPORT OF RESULTS:

A report of test results will be prepared 'ollowing completion of the examination program. The report will determine if guide tube wear is within acceptable bounds, and will address whether future testing is required.