ML20093A218
| ML20093A218 | |
| Person / Time | |
|---|---|
| Site: | Vermont Yankee File:NorthStar Vermont Yankee icon.png |
| Issue date: | 07/03/1984 |
| From: | Murphy W VERMONT YANKEE NUCLEAR POWER CORP. |
| To: | Vassallo D Office of Nuclear Reactor Regulation |
| References | |
| RTR-NUREG-0313, RTR-NUREG-313 FVY-84-77, IEIN-84-41, NUDOCS 8407100223 | |
| Download: ML20093A218 (2) | |
Text
s ;c VERMONT YANKEE NUCLEAR POWER CORPORATION FVY 84-77 RD 5. Box 169, Ferry Road, Brattleboro, VT 05301
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. y ENGINEERING OFFICE 1671 WORCESTER ROAD FRAMINGHAM, MASSACHUSETTS 01701 TELEPHONE 617-872-8100 U.S. 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 VYNPC, I&E Information Notice 84-41, dated 6/1/84 c)
Letter, VYNPC to USNRC, FVY 84-22, dated 3/13/84 d)
NUREG 0313, Revision 1 e
Letter, VYNPC to USNRC, FVY 84-27, dated 3/23/84 f
Letter, VYNPC to USNRC, FVY 84-45, dated 5/15/84
Dear Sir:
Subject:
Vermont Yankee 1984 Refueling Outage Weld Joint Inspection Program The purpose of this letter is to provide additional information regarding the Weld Joint Inspection Program being undertaken at Vermont Yankee Nuclear Power Station during the present refueling outage. The program was originally submitted via Reference c) and supplemented via References e) and f).
We have recently received I&E Information Notice 84-41, Intergranular Stress Corrosion Cracking in Boiling Water Reactors [ Reference b)], and have evaluated the technical concerns as they apply to Vermont Yankee. The infor-mation notice addresses three areas of concern:
the recirculation system suction nozzles (N1 nozzles), the jet pump inlet nozzles (N2 nozzles), and the jet pump instrument nozzles (N8 nozzles).
At vermont Yankee the N1 safe ends are Type 304L stainless steel.
The nozzle buttering was re-buttered following vessel heat treatment with Type 308L stainless steel, and the original furnace-sensitized safe ends were replaced with the current 304L safe ends. We consider this installation to be
" conforming" as defined by Reference d).
8407100223 840703 PDR ADOCK 05000271 0
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- U.S. Nucl ar R;gulatory Commission July 3, 1984 s
-Pag 2 2 VEHMONT YANKEE NUCLEAR POWER CORPORATION t
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The N2 safe ends are Type 304 stainless steel, and were installed sub-sequent to vessel heat treatment. The nozzle buttering is Type 308L containing greater than 5% ferrite and has a less-complex metallurgical composition than that identified in Reference b). The buttering was' applied prior to vessel heat treatment. These safe ends will be replaced during_ the recirculation pipe replacement project scheduled to begin in September'1985.
The N8 instrument; penetration assemblies are fabricated from Type 304L stainless steel and are of a different design than those identified in Reference b). The nozzle buttering was re-buttered,with 308L following vessel heat treat-ment, and the original furnace-sensitized ' safe ends were replaced with the current 304L safe ends. Like the N1 safe ends, this installation is considered
" conforming".
Based on the above, we have concluded that no augmented inspections are
. warranted during this refueling outage.
Since we are scheduled to complete the present scope of inspections by July 16, 1984, any concerns regarding this posi-tion should be brought to our attentionino later than July 14, 1984; otherwise we will consider this position accepted.
,Very truly yours, VEPMONT YANKEE NUCLEAR POWER CORPORATION esf**---
Warren P.
urphy Vice President and Manager of Operations WPM /dm
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