ML20005G084

Responds to NRC Bulletin 89-002 Re Stress Corrosion Cracking of high-hardness Type 410 Stainless Steel Internal Preloaded Bolting in Anchor Darling Model S350W Swing Check Valves or Valves of Similar Design

ML20005G084
Person / Time
Site:	Vermont Yankee
Issue date:	01/10/1990
From:	Murphy W VERMONT YANKEE NUCLEAR POWER CORP.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
IEB-89-002, IEB-89-2, NUDOCS 9001180106
Download: ML20005G084 (2)

Text

_ _ _ _ . . . . _ _ . . . . . . . . . . .

gj.

je,3.t .

VERMONT YANKEE T NUCLEAR POWER: CORPORATION

. ,e - Ferry Road, Brattleboro, VT 053017032 90-004 ENGINEERING OFFICE

%0 MAIN STREET

• BotToN, M A 01740 (508)779 0711 January 10, 1990 U.S. Nuclear Regulatory Commission Washington, D.C. 20555 i Attention: Document Control Desk

References:

a) License No. DPR-28 (Docket No. 50-271) b) USNRC Bulletin No. 89-02, NVY 89-152, dated 7/19/89 Dear Sir

Subject:

Stress Corrosion Cracking of High-Hardness Type 410 Stainless Steel Internal Preloaded Bulting in Anchor '

Darling Model S350W Swing Check Valves or Valves of Similar Design Bulletin 89-02 [ Reference b)] requested all licensees to determine if any Anchor Darling Model S350W swing check valves or valves of similar design, with ASTM A193 Grade B6 Type 410 SS internal bolting material, are installed in safety-related plant systems. The Bulletin requests that licensees who determine that they do not have Anchor Darling Model S350W swing check valves with Type 410 SS bolts subject to the Bulletin and do not have any valves of similar design with preloaded Type 410 SS bolt material to provide a letter of confirmation of these facts to the NRC within 180 days of receipt of Reference b). Reference b) was received by Vermont Yankee on July 21, 1989.

Vermont Yankee has conducted a review of all swing check valves installed in safety-related systems with regard to Bulletin 89-02 concerns and has determined that there are no valves installed in these systems at Vermont Yankee which are similar in design and internal bolting material to the subject valves discussed in Bulletin 89-02. Vermont Yankee has iden-tified three swing check valves of similar design, from manufacturers other than Anchor Darling, installed in plant safety-related systems: however, internal bolting of these valves do not consist of Type 410 SS material and therefore fall outside the area of concern of Bulletin 89-02. It should also be noted that these valves are included in the Vermont Yankee Check Valve Inspection Program, and are therefore included in ongoing inspection activities.

9001100106 900110 r PDR ADOCK 05000271 m' 8Q Q PNU '

r n

?.o j

VEZMONT YANKEE NUCLEAR POWER CORPORATION l

U.S. Nuclear Regulatory Commission January 30, 1990 Page 2 We trust that the information provided above sufficiently addresses the i requirements of Bulletin 89-02 for Vermont Yankee. If, however, you have any further questions or desire additional information, please contact this i

! office.

Very truly yours, l

VERMONT YANKEE NUCLEAR POWER CORPORATION w d'{ees Warren P. Murphy v

• Vice President and Manager of Operations I

/dm ce; USNRC Regional Administrator, Region I USNRC Resident Inspector, VYNPS USNRC Project Mr. nager, VYNPS 4 TATE OF VERMONT)

)ss win 0 HAM COUNTY )

l Then personally appeared before me, Warren P. Murphy, who, being duly sworn, did state that he is Vice President and Manager of Operations of Vermont Yankee Nuclear Power Corporation, that he is duly authorized to execute and file the foregoing document in the name and on the behalf of Vermont Yankee Nuclear Power Corporation and that the statements therein are true to the best of his

, knowledge and belief.

v4[ . ); 'M O

Aw l Diane M. McCue , Notary Public My Commission Expires F 0, 1991 rgCCy 4$ p F3TMY l

3 I'U:UC ) g

% S/

'& 4 Cou_nTt