ML20211H791
| ML20211H791 | |
| Person / Time | |
|---|---|
| Site: | Millstone, Hatch, Calvert Cliffs, Peach Bottom, Fermi, Arkansas Nuclear, Prairie Island, North Anna, Vermont Yankee, Crystal River, Duane Arnold, Farley  |
| Issue date: | 09/30/1997 |
| From: | Fratianne S COLTEC INDUSTRIES, INC. |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| REF-PT21-97 NUDOCS 9710070133 | |
| Download: ML20211H791 (2) | |
Text
.
Cottocindustries reirb.nk uor Engine Divlelon f63511$492 l
eb Pa ' ddom a
l INTERIM LETTER To: Document Control Desk U.S. Nuclear Regulatory Commission Washington, DC. 20555 From: Coltec Industries-Fairbanks Morse Engine Division (FMED)
Date: 30 September 1997
Subject:
Weldments on Opposed Piston and Coltec-Pleistick Emergency Stand-By Diesel Gen-Set Lube-Cil and Jacket Water Piping Systems on 4 August 1997, FMED became aware that a weldment associated with the lube-oll piping system failed at Millstone Unit 2. Further investigation by the utility revealed less than full penetration in the affected weld. The condition was observed in a weld joint associated with a 4 inch mechanical tube section with a
.250 inch wall located on the lube oil pump discharge piping.
At this time, the root cause of the Millstone piping failure is not yet known.
However, due to the fact that the failure occurred in a weld with partial penetration, the quality of the weldment is being considered.
The welds at issue are the original welds performed in the late 1960s, and early 1970s; when contract requirements did not invoke either ASME Section lil, Class 3 Piping, or ANSI B31.1 Piping design requirements. The following utility sites are affected.
[
m(M? Arkansas Nuclear one Millstone 1 & 2 2 Y i, 3 3 '
, eiy Calvelt. Cliffs 1 & 2 North Anna 1 & 2 i n,33 V h y Crystal River 3 Peach Bottom 2 & 3 s,,, ;,9 Je/ 3 '
3.g Duane Amold Energy Center Plant Hatch 1 & 2 1: q 3y 9,
g.p,9 4 Fartoy 1 & 2 Pralrie Island 1 & 2 2 3 3, g Fermi 2 & 3 Vermont Yankee
- 3j y0
- TA*Te&M ZE 88d.
s PDR bk i
cm
.._m.._.._
Coltec Industries, Fairt>anks Morse Engine DMelon is curren#y conduc6ng an evaluaton under the rules of 10 CPR Part 21; Pipe sec#ons returned from Florida Power Corpora 6on, Crystal River 3 and secuons of pipe from a spare unit returned by Baltimore GM & Electric earlier this year provide the source for initial samples currently being analyzed by FMED. Additional samples of lube-oil end/or Jacket water piping have been requested from Florida Power, Millstone and Vermont Yankee.
As a minimum, the following questons will be ' answered as a lesult of the evaluaton.
- 1) is the wold design compliant with customer requirements?
- 2) are_ the subject welds compliant with FMED design requiremtats?
- 3) If not, do the existing welds posses sufficient strength?
- 4) what is the root cause of the identified condition?
- 5) what correc6ve action, if any, should the customer take?
- 8) what preventive ac6on is required by FMED?
It is estimated that the evaluation will require an addluonal six (6) to ten (10) weeks to complete.
f Sincerely,
~
scott A.
a Sr. Quality Assurance Engineer