ML20093N649

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Forwards PGE-1021, 1984 Refuel Outage Augmented Inservice Insp Program, Final Rept.Program Implemented to Address Concerns Detailed in IE Bulletin 83-02
ML20093N649
Person / Time
Site: Vermont Yankee File:NorthStar Vermont Yankee icon.png
Issue date: 07/30/1984
From: Sinclair J
VERMONT YANKEE NUCLEAR POWER CORP.
To: Vassallo D
Office of Nuclear Reactor Regulation
Shared Package
ML20093N651 List:
References
FVY-84-93, IEB-83-02, IEB-83-2, IEB-84-11, NUDOCS 8408020082
Download: ML20093N649 (2)


Text

e VERMONT YANKEE m 84-93 NUCLEAR POWER CORPORATION

. RD 5, Box 169, Ferry Road, Brattleboro, VT 05301 ,,,Ly yo y ENGINEERING OFFICE 1671 WORCESTER ROAD

. FRAMINGHAM, MASSACHUSETTS 01701

. July 30, 1984 retamone .o.ana 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 VYNPC, Cenoric Letter 84-11, dated April 19, 1984 (c) Letter, VYNPC to USNP.C FVY 84-22, dated March 13, 1984 (d) Letter, VYNPC to USNRC, FVY 84-45, dated May 15, 1984 (e) Letter, VYNPC to USNRC, FVY 83-50, dated June 3, 1983 (f) Letter, VYNPC to USNRC, FVY 84-27, dated March 23, 1984 (g) Letter, VYNPC to USNRC, FVY 84-59, dated June 5, 1984 (h) Letter, VYNPC to USNRC, FVY 84-71, dated June 29, 1984 (i) Letter, VYNPC to USNRC, FVY 84-77, dated July 3, 1984 (j) Letter, VYNPC to USNRC, FVY 84-78, dated July 6, 1984 (k) Letter, USNRC to VYNPC, I&E Bulletin 83-02, dated March 5, 1983

" (1) Letter, USNRC to VYNPC, NVY 83-150, Confirmatory Order, dated June 27, 1983

Subject:

Final Report - Results of the Vermont Yankee 1984 Refuel Outage Augmented In-Service Inspection Program

Dear Sir:

The purpose of this letter is to provide yu. with the attached report which details the results of the Vermont Yankee 1984 Refuel Outage Augmented In-Service Inspection Program. This program was implemented to address concerns detailed in I&E Bulletin 83-02 (Reference (k)] with respect to the discovery of Intergrapular Stress Corrosion Cracking (IGSCC) in larger diameter stainless steel recirculation system piping at s.everal Boiling Water Reactor (BWR) facilities. The details of our proposed program were submitted to the NRC by letter, dated March 13, 1984 [ Reference (c)], and supplemented by letter, dated March 23, 1984 [ Reference (f)].

Subsequent to the submittal of ot r proposed program, the NRC issued Generic Letter 84-11 [ Reference (b)] which prescribed certain actions to be ffho O o a i g

s

' United States Nuclear Regulatory Commission- July 30,.1984 Attention: Mr. Domenic B. Vassallo Page 2 c, taken by licensees to address current IGSCC-related concerns. By letter, dated June 5, 1984 [ Reference (g)], we supplemented our March 13, 1984 proposed program to reflect our consideration of the recommendations contained in Generic Letter 84-11.

c.

Following our June 5, 1984 submittal, we have held numerous conference calls with members of your staff to address questions raised as a result of the Staff's review of our proposed program. By 1etters dated June 29, 1984

[ Reference (h)], July 3, 3 984 [ Reference (1)], and July 6,1984

[ Reference (j)], we provided additional information in response to these

. questions.

The enclosed Final Report details the results of our 1984 Refuel Outage Augmented In-Service Inspection (ISI) Program and provides detailed information with respect to our improved inspection techniques, criteria for evaluat'ing inspection findings, and justification for the continued operation i of, Vermont Yankee until our 1985 refueling outage. During the 1985 outage, we I will replace the Reactor Recirculation and ~ Residual Heat Removal System stainless steel piping.

j. We are confident that the information provided herewith resolves the

'~ concerns expressed in I&R Bulletin 83-02 and demonstrates that plant operation through the 1984/1985 operating cycle is justified. Should you have any questions regarding this matter or desire additional information, please contact us.

F Very truly yours, VERMONT YANKEE NUCLEAR POWER CORPORATION

. . 6 J. B. Sinclair Licensing Engineer JBS/caj 4

f b

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