ML19273B684
| ML19273B684 | |
| Person / Time | |
|---|---|
| Site: | Millstone  |
| Issue date: | 05/03/1979 |
| From: | Counsil W NORTHEAST UTILITIES |
| To: | Grier B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| References | |
| NUDOCS 7906120128 | |
| Download: ML19273B684 (2) | |
Text
h. b
"^
IWIFI111!AST trrII.ITIIIS mu ne cwa er-P.o BOX 270 N2$$$$N rm HARTFORD. CONNECTICUT 06101 O.270%.Z'L-N *** "
k
,~.<, m u. _ ~~
May 3, 1979 Docket No. 50-336 Mr. Boyce H. Grier Director, Region 1 Office of Inspection and Enforcement U. S. Nuclear Regulatory Commission King of Prussia, PA 19406
Reference:
(1)
W. G. Counsil letter to B. H. Grier dated April 16, 1979.
Gentlemen:
Millstone Nuclear Power Station, Unit No. 2 Longitudinal Weld Defects in ASME SA-312 Stainless Steel Pipe _
In Reference (1), Northeast Nuclear Energy Company (NNECO) responded to NRC concerns regarding possible longitudinal weld defects as described in I&E Bulle-tin 79-03.
Reference (1) indicated that prior to the start of Cycle 3 operation, NNECO would report the results of the examinations completed and discuss plans with respect to possible additional examinations.
In fulfillment of that commit-met.t, the following information is provided.
A total of 159 feet,f the subject pipe with seam welds on twelve-inch diameter safety injection piping have been examined pursuant to Technical Specification 4.4.10.a.
The examination involved the pipe from the discharge of all four safety injection tanks to each safety injection flow valve.
The welds were found to be acceptable, in that no reportable ultrasonic signals were detected.
NNECO's evaluation of these results has determined that the successful comple-tion of this sample of the subject pipe is adequate justification to resume plant operation. The basis tor this determination is that the sample examined represents a significant frection of the total Youngstown seam welded pipe in use at Millstone Unit No. 2, approximately 29%, and that no reportable ultrasonic signals were detected.
However, in recognition of the hE concern identified in I&E Bulletin 79-03, please be advised that it is the intention of NNECO to examine the remainder of the subject pipe in use at Millstone Unit No. 2 prior to the start of Cycle 4 operation.
2350 230 7906120127
, p o
We trust that the above information is responsive to your request, and is sufficient for you to concur with our determination.
Very truly yours, NORTHEAST NUCLEAR ENERGY COMPANY A
l
/?
L C0 V?l0t s
W. G. Cou'nsil Vice President 2350 231