ML20148U064
| ML20148U064 | |
| Person / Time | |
|---|---|
| Site: | Zion File:ZionSolutions icon.png |
| Issue date: | 01/15/1988 |
| From: | Leblond P COMMONWEALTH EDISON CO. |
| To: | NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM) |
| References | |
| 4098K, NUDOCS 8802030459 | |
| Download: ML20148U064 (18) | |
Text
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[ ,_ ) One First NM Piera. CNea00. Inss c v ' Address Repy to: Poel Omco Box 767-CNcago,innoes 60690 0767 t January 15, 1988 r U.S. Nuclear Regulatory Comunission l Attn: Document Control Desk Washington, DC 20555 1
Subject:
Zion Nuclear Power Station Units 1 and 2 Amendment Nos. 98 and 88 to DPR-39 and DPR-48 NRC Docket Nos 50-295 and 50-30,4 References (a): November 18, 1986 letter from J.A. Norris to D.L. Parrar (b): September 24, 1986 letter from P.C. LeBlond i to H.R. Denton Gentlemen l Reference (a) issued Zion license Amendment Nos. 98 and 88 to i Facility Operating Licenses Nos. DPR-39 and DPR-48. That amendment allowed l the installation of sleeves in Zion's Steam generators to repair degraded f tubes. Reference (b) supplied the NRC Staff with information in support of f ! that amendment. Reference (b) committed to provide the NRC staff with , i information regarding the detectability threshold in the sleeve / tube ! combination. This submittal is providing the results of that additional work. ! A summary of the investigative work is enclosed with this letter. If [' any further questions arise regarding this matter, please direct them to this office. Very truly yours, l P. C. LeBlond t Nuclear Licensing Administrator ; s I i cc: Resident Inspectos - Zion I A. B. Davis [ ! J. A. Norris l 5 i po0 I , 4098K g l ; i ! 8802030459 990115 l l PDR ADOCK 05000295 { p PDR l t
ENCLOSURE RESULTS OF DETECTABILITY THRESHOLD INVESTIGATION Investigative work on the detection of defects in sleeved tubes has been completed and advanced development work is continuing. The first part of the investigations was to inspect and evaluate sleeve samples. These inspections show defects that can be seen and evaluated in both the sleeve and the parent tube behind the sleeve using either a Bobbin Coil or a Motorized Rotating Pancake Coil (MRPC). Good correlation was seen by both Bobbin Coil and MRPC evaluations. Simulated defects were made in samples in the expansion region including the weld. These were tested using the MRPC and showed good correlation with the actual defect. MRPC results showed that a 40% defect in the ID of the sleeve, a 40% defect in the OD of the original tube, a 20% indication in the ID of the sleeve and OD axial notches in the weld could all , be seen and evaluated. An additional sample with a 20% indication at the weld l in the tube o.D. was tested and evaluated, but the 20% indication could not be i discerned. All evaluations of these samples were well within the normal range of eddy current ev.iluations. Copies of the evaluations (RPC scans and lissajous) and sketches of the samples are attached. These examinations demonstrate the required detectability for I.D. indications as stated in Zion Technical Specification 4.3.1.B.4.A.6.a. Based on the Combustion Engineering Sleeve Licensing Report which shows that defects can be detected in all areas of the sleeve and tube and the testing described in this report which shows that defects in the weld area can be detected and sized in the I.D., defects in all areas of the tube and sleeve have been shown to be detectable except for indications less than 40% in the O.D. of the tube j in the weld area. i Additional work is planned to investigate other types of probes to enhance detection. This work is part of Zion's normal practices to improve eddy current test capabilities and methods, commonwealth Edison Company in also involved in other studies to enhance defect detection and evaluation techniques and methods with other organizations such as the Electric Power Research Institute. 4098K
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