ML20069G533
| ML20069G533 | |
| Person / Time | |
|---|---|
| Site: | Vermont Yankee File:NorthStar Vermont Yankee icon.png |
| Issue date: | 03/22/1983 |
| From: | Sinclair J VERMONT YANKEE NUCLEAR POWER CORP. |
| To: | Vassallo D Office of Nuclear Reactor Regulation |
| References | |
| FVY-83-23, NUDOCS 8303280019 | |
| Download: ML20069G533 (1) | |
Text
{{#Wiki_filter:.__ i '47IIIlfKIC)P41r lf'/LPil(III2 NUCLEAR POWER CORPORATION 1 RD 5, Box 169 Ferry Road, Brattleboro, VT 05301 acPLv To-83 23 W ENGINEERING OFFICE Y thrch 22, 1983 1671 WORCESTER ROAD FRAMINGHAM MASSACHUSETTS 01701 TELEPHONE 617-872-8100 United States Nuclear Regulatory Commission Washington, D. C. 20555 Attention: Office of Nuclear Reactor Regulation Mr. Domenic B. Vassallo, Chief Operating Reactors Branch No. 2 Division of Licensing
References:
(a) License No. DPR-28 (Docket No. 50-271) (b) Letter, USNRC to All Boiling Water Reactors, dated October 1, 1980 (c) Letter, VYNPC to USNRC, FVY 81-14, dated January 27, 1981
Subject:
Vermont Yankee Scram Discharge Volume System
Dear Sir:
Reference (c) documented our commitment regarding the installation of a cross-connect vent line in our Scram Discharge Volume (SDV) System to address the concerns expressed in Reference (b). This line was originally installed to enhance the ability to drain the scram discharge and instrument volumes. As discussed in Reference (c), we also committed to install two independent scram discharge instrument volumes during the 1983 refueling outage. This modification connects the 6" SDV header by continuously downward sloping 6" pipe directly to its corresponding 10" diameter instrument volume. By eliminating the existing line size reductions of the present SDV System, and providing for continuously downward sloping pipe and atmospheric breaks at each SDV drain, continuous draining of the SDV is assured and the need for redundancy in the vent lines (cross-connect) is eliminated. Based on the above considerations, we have determined that the need for the SDV vent cross-connect line is no longer necessary. We trust that this inf ormation is acceptable; however, should you have any questions, please contact us. Very truly yours, VERMONT YANKEE NUCLEAR POWER CORPORATION b n L & r' -{} () f J. B. Sinclair Licensing Engineer i 8303280019 830322 PDR ADOCK 05000271 P PDR}}