ML13317B209
| ML13317B209 | |
| Person / Time | |
|---|---|
| Site: | San Onofre  |
| Issue date: | 10/19/1990 |
| From: | Rosenblum R SOUTHERN CALIFORNIA EDISON CO. |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| Shared Package | |
| ML13310A273 | List: |
| References | |
| NUDOCS 9011010152 | |
| Download: ML13317B209 (2) | |
Text
Southern California Edison Company 23 PARKER STREET IRVINE, CALIFORNIA 92718 October 19, 1990 R.M.ROSENBLUM TELEPHONE MANAGER OF (714) 587-5420 NUCLEAR REGULATORY AFFAIRS U. S. Nuclear Regulatory Commission Attention: Document Control Desk Washington, D.C. 20555 Gentlemen:
Subject:
Docket No. 50-206 Additional Information Thermal Shield Support System Replacement San Onofre Nuclear Generating Station Unit 1 The purpose of this letter is to provide NRC with the following information:
- 1. The proprietary and non-proprietary versions of Westinghouse drawing 1880E47, Revision 5, Thermal Shield Replacement Support Blocks.
(Enclosure 1)
- 2. Westinghouse reconciliation report summarizing the evaluation of the modifications to the thermal shield replacement support blocks and the core barrel.
Modifications were performed to correct the alignment problem experienced while attempting to install the replacement fasteners. The evaluation concludes that the modifications have no adverse impact on the structural adequacy of the replacement support blocks, fasteners, and the core barrel. (Enclosure 2)
- 3. Discussion of the basis for the required torque values for new electric discharge machined (EDM) threads. (Enclosure 3)
- 4. Proprietary and copyright information released by Westinghouse to be used in the NRC Staff Safety Evaluation Report on the thermal shield replacement support system design. (Enclosure 4)
- 5. Response to questions from Mr. W. P. Chen (NRC consultant) of Rockwell International Corporation. The questions were related to the thermal shield replacement support system calculations performed by Westinghouse.
(Enclosure 5)
This information was requested by the NRC in the telephone discussions of September 14, 1990, and September 20, 1990.
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Document Control Desk October 19, 1990 contains information proprietary to Westinghouse Electric Corporation, which is supported by an affidavit signed by Westinghouse, the owner of the information. The affidavit sets forth the basis on which the information may be withheld from public disclosure by the Commission and addresses with specificity the considerations listed in paragraph (b)(4) of Section 2.790 of the Commission's regulations. Accordingly, it is respectfully requested that the information which is proprietary to Westinghouse be withheld from public disclosure in accordance with 10 CFR Section 2.790 of the Commission's regulations.
Correspondence with respect to the proprietary aspects of the Application for Withholding or the supporting Westinghouse Affidavit should reference CAW-90-077 and should be addressed to R. A. Wiesemann, Manager of Regulatory and Legislative Affairs, Westinghouse Electric Corporation, P.O. Box 355, Pittsburgh, Pennsylvania 15230-0355.
If you have any questions or comments, or if you would like additional information, please let me know.
Sincerely, Enclosures cc: J. B. Martin, Regional Administrator, NRC Region V C. Caldwell, NRC Senior Resident Inspector, San Onofre Units 1, 2 and 3 C. D. Townsend, NRC Resident Inspector, San Onofre Unit 1