ML19098B424: Difference between revisions
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Revision as of 10:33, 2 February 2020
| ML19098B424 | |
| Person / Time | |
|---|---|
| Site: | Surry  |
| Issue date: | 04/15/1977 |
| From: | Stallings C Virginia Electric & Power Co (VEPCO) |
| To: | Reid R, Rusche B Office of Nuclear Reactor Regulation |
| References | |
| Serial No. 057/021177 | |
| Download: ML19098B424 (4) | |
Text
.* VIRGINIA ELECTRIC .A.ND POWER COMPANY RICHMOND, VIRGINIA 23261
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1--p Mr. Benard C. Rusche \V>>--
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Director of Nuclear Reactor Regulat'i~7'7r~\(j)~ PO&M/TAP:dgt f~;)'
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Serial No. 057/021177 U. s. Nuclear Regulatory Commission ~~ Docket No. 50-280 Washington, D. C. 20555 License No. DPR-32 Attn: Mr. Robert w. Reid, Chief Operating Reactors Branch 4
Dear Mr. Rusche:
The purpose of this letter is to present our Unit No. 1 steam generator surveillance program for this present outage. The program will consist of the following:
- 1) An eddy current program will be accomplished from the cold leg side over the U-bends including Rows 1-5, all columns. This is to provide current data for this area.
- 2) A tube dent sizing and accompanying eddy current program will be accomplished from the hot leg side for the interior tube lane region, the wedge regions and the patch plate region. Specifically, these areas are shown on the attachment. Initially, a 00650 probe will be used at 400 KHz, which will detect tube wall flaws. Then, any of the tubes which will not pass the 0.650 probe will be probed with a 0.610 probe at 3.5 KHz, which will map any defects in the support plates (an additional number of tubes will be added to pro-vide a representative example for TSP condition). Finally, any tubes which will not pass the 0.610 probe will be probed with a 0.540 probe at 25 KHz, which will map the level of sludge (an additional number of tubes will be added to provide a representative example for sludge measurement).
- 3) A photography and inspection program through the lower handholes and the three inch inspection ports will be accomplished. The upper-most and lowest support plates will be inspected and the lowest plate flow slots gauged. The upper support plate will be inspected to the extent possible without d~sturbing the flow slot blocking device.
- 4) The shell to wrapper annulus gauging program will be accomplished.
This ~ata will be related to previously established strain maps.
e e VIRGINIA ELECTRIC AND POWER COMPANY TO Mr. Benard C. Rusche Page No. 2 This program is designed to provide the information necessary to estab-lish a plugging criteria that will allow an acceptable operating period.
The plugging criteria is expected to be similar to the criteria used for Unit No. 2, which was submitted in Attachment No. 2 of our March 21, 1977 ietter.
The plugging program and its associated operating period will be for-warded when the surveillance program data has been evaluated.
We hope that this type of continuing communication will allow your time* far review*to be minimized. Our expected startup date is May 2, 1977.
Very truly yours,
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- c. M. Stallings Vice President-Power Supply and Production Operations Attachments cc: Mr. Norman C. Moseley
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