ML19325E841
| ML19325E841 | |
| Person / Time | |
|---|---|
| Site: | McGuire, Mcguire  |
| Issue date: | 10/31/1989 |
| From: | Tucker H DUKE POWER CO. |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| IEB-89-002, IEB-89-2, NUDOCS 8911090145 | |
| Download: ML19325E841 (2) | |
Text
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.l October 31 1989 j
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~U. S. Nuclear Regulatory Commission O
_ Document Control Desk kashington, D.C.
20555
Subject:
. Duke Power' Company 0
McGuire Nuclear: Station Docket Nos.-50-369, 50-370
. Response..to NRC Bulletin 89-02 i
" Stress Corrosion Cracking of High-Hardness l
Type 410 Stainless Steel Internal Preloaded J
Bolting In Anchor Darling Model S350W Swing Check Valves or Valves-of Similar Design" Pursuant to' Item 1 of the Reporting Requirements of NRC Bulletin 89-02, I
'I
, ;am providing confirmation of the status of our investigation into this completed investigation are given below for each unit.
bulletin at McGuire Nuclear Station. The results of our recently
. Unit 1 i
'.No-Anchor' Darling Model S350W swing check valves are installed on McGuire j
Unit.1.. Additionally,-none of those valves are in our warehouse stock.
There are eight (8) valves installed in McGuire Unit 1 that are similar in design to the Anchor Darling Model S350W. These' valves were manufactured 1
l by.Atwood & Morrill and are located in the cold leg' accumulator discharge 4
- lines. These valves were installed.by recent Nuclear Station L
Modification, m
. We do not plan to inspect these valves daring the next refueling outage.
These fasteners were evaluated in detail during valve design. The i
fasteners '.iere specified to have hardness valves less than those discussed
_l in bulletin 89-02.
The manufacturer has provided material certificatior.,
including hardness teuting results from the fastener supplier.
In addition, thene Type 410 Fastenern are not torqued up to a high stress levn1. indicating there is lesa ousceptability for stress corrosion l
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s, Document Contr9 Dock
., A itgr 2 October 31, 1989 Unit 2 No Anchor Darling Model S350W swing check valves are installed on McGuire Unit 2.
As mentioned above, there are none of these valves in our warehouse stock.
No valves of similar design (to the Anchor Darling Model S350W) as discussed in Bulletin 89-02 are installed in Unit 2.
There are eight (8)
Atwood & Morrill spare valves in our warehouse stock intended for future installation on Unit 2.
The hardness condicion of the fasteners for these F
valves is the same as described above for Unit 1.
The next refueling outage for McGuire Unit 1 is currently scheduled to i
begin in late March 1990. Consequently, if there are any NRC concerns I
about the status of Bulletin 89-02 discussed above, please let us know prior to December 31, 1989. For outage planning purposes, this amount of lead time will be required for any possibic inspection activities. As mentioned above, we do not feel inspections of the eight identified valves are warranted.
If desired, we would welcome the opportunity to discuss this with the NRC technical staff at the earliest possible date.
If therc are questions or comments on this matter, please contact J. S.
Warren of my Regulatory Compliance staff at (704) 373-2627.
I declare under penalty of perjury that the statements set forth herein are true and correct to the best of my knowledge.
J Very truly yours, l
l 1
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1 IInl B. Tucker i
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JSW365/lcs j
i xct Mr. S. D. Ebneter
'Regienal Administrator, RII l
l U. S. Nuclear Regulatory Commission l
101 Marietta St., NW, Suite 2900 Atlanta, Georgia 30323 l
i I
Mr. P. K. VanDoorn Sr. NRC Resident Inspector McGuire Nuclear Station Mr. Darl llood Office of Nuc-sr Reactor Regulation U. S. Nuclear uguintory Commission Washington, D.C.
20555 a