Text

Forwards Vols 1-3 to Rev 0 to Twentieth Yr Physical Surveillance of ANO Unit 1 Containment Bldg
	ML20063L749
Person / Time
Site:	Arkansas Nuclear
Issue date:	03/01/1994
From:	Mims D; ENTERGY OPERATIONS, INC.
To:	Callan L; NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
Shared Package
ML20063L750	List: 1CAN039401, Forwards Vols 1-3 to Rev 0 to Twentieth Yr Physical Surveillance of ANO Unit 1 Containment Bldg; ML20063L755;
References
	1CAN039401, 1CAN39401, NUDOCS 9403070408
	Download: ML20063L749 (3)
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. -... ...,_..._~~__m March 1,1994 1CAN039401 Mr. Leonard J. Callan Regional Administrator U. S. Nuclear Regulatory Commission Region IV 611 Ryan Plaza Drive, Suite 400 Arlington, TX 76011-8064

Subject:

Arkansas Nuclear One - Unit 1 Docket No. 50-313 License No. DPR-51 Twenty Year Tendon Surveillance Report

Dear Mr. Callan:

In accordance with Arkansas Nuclear One, Unit 1 (ANO-1) Technical Specifications 4.4.2.2 and 612.4, Entergy Operations, Inc. hereby submits the report of activities ,

conducted pursuant to the twentieth year physical surveillance of the ANO-1 reactor i building post-tensioning system. The three volume report is enclosed. The results of the j surveillance conclude that no abnormal degradation has occurred in the post tensioning -

system.

The tendon surveillance program consists of a periodic inspection of the physical condition of a randomly selected group of surveillance tendons. Physical surveillance consists of sheathing filler inspection, anchorage inspection, tendon lifloff, inspection and tensile i testing of removed wire samples, and tendon retensioning with the tendons being resealed after completion of all inspections.

A group of four dome, three vertical and three horizontal tendons were selected for inspection in compliance with NRC Regulatory Guide 1.35 Rev. 2, with each selected tendon requiring detensioning.

One wire was removed from each group of tendons (V-101,32H50,1D302) for corrosion investigation and physical testing. In addition, dome tendon 3D120 was inspected as a result of a recommendation from the fifleenth year tendon surveillance report conducted during 1988. A wire was removed from 3D120 to check corrosion levels after regreasing problems noted during the last surveillance. All wire diameters were within 0.250 0.002" 940307040s 9403o1 PDR ADOCK 05000313 ,

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r U.- S. NRC March 1,1994 1CAN039401 Page 2 and the corrosion condition of all wires was level 1 (no visible oxidation or pitting) throughout their entire length.

The samples from V-101, 32H50 and ID302 exceeded the yield and ultimate strength minimum values of 192,000 and 240,000 psi respectively and the elongation value of the wire at failure exceeded the four percent minimum for all samples. Initial samp es from tendon 3D120 passed the yield strength minimum value of 192,000 psi but failed to meet the ultimate strength value of 240,000 psi. Several samples also failed to reach the elongation requirement of four percent.

A second wire was removed to allow additional testing. When similar results were achieved all of the samples were sent for analysis by an independent source. Samples of wire ID302 were also tested to verify the results achieved during site testing.

The results of the above independent tests confirmed the field tensile test results--that is, the tensile strength for tendon 3D120 was slightly lower than the minimum required whereas the yield strength was higher than the minimum required. Based on the results of chemical composition, hardness tests, and visual and metallographic examination, the carban and manganese contents of 3D120 were determined to be slightly lower than ID302 which resulted in a slightly lower tensile strength for 3D120. This was the original condition from the wire mill; it is not a sign of degradation during service. It was concluded that the slightly lower tensile strength of tendon 3D120 presented no practical consequences.

Since tendon wire 3D120 exceeded the minimum required yield strength, with margin, and no corrosion was evident, tendon 3D120 is considered acceptable for service and continues to meet the design intent based on engineering judgment. The results of the -

testing and analysis of tendon 3D120 substantiated the conclusion reached in the fifteenth year surveillance that the large grease replacement associated with this tendon did not indicate system degradation. The full report can be found in Volume 3, Section 8, Appendix E.

Also, based on the results of the fifteenth year surveillance, tendon 3D120 was checked for grease loss during the twentieth year surveillance. It was determined that the grease void exceeded 5% of the net duct volume. The calculated grease void was approximately 11% (compared to 42% void in the fifteenth year surveillance in 1988) of the net duct volume. It is believed that the portion of the void > 5% was caused by shrinkage of the tendon filler material due to temperature changes since the 15th year surveillance. No evidence of grease leakage from the tendon end caps was apparent. Based on engineering judgment, the 11% calculated grease loss creates no operability problems with the tendon.

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U. S. NRC

[ March 1,1994

. 1CANO39401 Page 3 4

Should you have any questions, please contact me.

Very truly yours,

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Dwight C. Mims Director, Licensing DCM/dwb enclosure cc w/ encl: U. S. Nuclear Regulatory Commission Document Control Desk Mail Station PI-137 Washington, DC 20555 cc w/o ercl:NRC Senior Resident Inspector Arkansas Nuclear One - ANO-l & 2 Number 1, Nuclear Plant Road Russelhille, AR 72801 Mr. George Kalman 4 NRR Project Manager Region IV/ANO-1 U. S. Nuclear Regulatory Commission -

NRR Mail Stop 13-H-3 One White Flint North 11555 Rockville Pike Rockville, MD 20852 Mr. Thomas W. Alexion NRR Project Manager, Region IV/ANO-2 U. S. Nuclear Regulatory Commission NRR Mail Stop 13-H-3 One White Flint North 11555 Rockville Pike Rockville, MD 20852

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ENGINEERING FILE NUMBER: 115 I Precision PSC surveillance Corporation TWENTIETH YEAR PHYSICAL SURVEILLAiCE l Main 0F ARKANSAS NUCLEAR ONE l' Title UNIT 1 -

CONTAINMENT BUILDING Sub-Title BY Prepared by: Paul C. Smith - Project Engineer Reviewed by: Thomas J. Dobrowski - Engineering Manager Approved by: Ronald D. Hough, P.E., General Manager ENGINEERING DEPARTMENT ABSTRACT This report presents the findings of the Twentieth Year Physical Tendon Surveillance of the Arkansas Nuclear One - Unit 1. Based on the results I of this surveillance, no abnormal degradation of the containment post-tensioning system is evident.

I _

REVISION CONTROL LOG Rev.

Reviskn By ' DP' V'd A Pages Affected Date l By b i thru vi, 1 thru 34, Al thru A402, B1 thru B12, C1 thru k 02 0194 k foO// C21, D1 thru D3, El thru E188, F1 thru F99, G1 thru G26.

I A l A

A A

A i

_A A 1 A I l L;s.22e ,o ma,cs ,eea

1CAN039401, Forwards Vols 1-3 to Rev 0 to Twentieth Yr Physical Surveillance of ANO Unit 1 Containment Bldg

Text

Subject:

Dear Mr. Callan:

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