ML20005A030

Followup Deficiency Rept Re Westinghouse Gate Valve Failure to Close,Initially Reported on 801126.Functional Review of Valves Ongoing.Nrc Will Be Kept Informed of Significant Developments & Resolutions

ML20005A030
Person / Time
Site:	Wolf Creek, Callaway
Issue date:	06/19/1981
From:	Petrick N, Petrick W STANDARDIZED NUCLEAR UNIT POWER PLANT SYSTEM
To:	James O'Reilly, Seyfrit K NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III), NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
References
10CFR-050.55E, 10CFR-50.55E, IEB-81-02, SLNRC-81-46, NUDOCS 8106290267
Download: ML20005A030 (2)

Text

1

.- 50S% QNb i SNUPPS Standardised Nuclear Unet aower Mont System 5 Choke Cherry Road Nicholas A. Petrick Redvise. Marvtand 20 50 Executive Director (300 ses. ecto June 19,1981 SLNRC 81-46 FILE: 0491.10.2 SUBJ: Follow-up 10 CFR 50.55(e) Report

. Mr. James G. Keppler, Director e Region III, Office of I & E U. S. Nuclear Regulatory Commission "

799 Roosevel t Road CD -

Glen Ellyn, Illinois 60137 /g Mr. Karl Seyfrit, Director / S kl/(,f'/ h h Region IV, Of fice of I & E O u -@..

U. S. Nuclear Regulatory Commission -

Jyfj 2 0 IS8A

Suite 1000, Parkway Central Plaza 3 611 Ryan Plaza Arlington, Texas 76012 D% s.sg%g */

. <b i .,

Occket Nos: STN 60-482, STN 50-483, STN 50-486 References : 1. SLNRC 80-54, dated November 26, 1980

2. SLNRC 81-22, dated April 1,1981

3. IE Bulletin No. 81-02, dated April 9,1981 Gentlemen:

Reference I reported the potential for certain valves to fail to close.

These valves were three-inch gate valves manufactured by Westinghouse Electro-Mechanical Division (EMD). Reference 2 reported that four-inch Westinghouse EMD valves may also fail to close against design differential pressure conditions and that larger Westinghouse valves were under review.

Reference 3 discussed the failure of certain gate valves, including three-inch EMD valves, to close against nigh differential pressure.

On June 17, 1981, Westinghouse informed SNUPPS that analysis predicts that closure problems could also be anticipated with EMD valves cf larger sizes (i.e. 6, 8, 10, 12, 14, 16 and 18 inch). Scme of these valves are used in active, safety-related applications in the SNUFPS design. SHUPPS is in the process of reviewing the functional applications of these valves and is pursuing the appropriate corrective action. The NRC will be kept informed of significant developments and resolutions of this matter.

Veryg truly yours ,

4%C '

[ Nicnolas A. Petric(k RLS/sr cc: see next page

[

ftl0I 810 6 2 9 0:;da~t

o . .

1 SLNRC 81- 46 .

.Page Two t

t k

cc: J. K. Bryan UE G. L. Koester KGE ,

D. T. McPhee KCPL W. A. Hansen flRC/ Cal T. E. Vandel NRC/WC J. Konklin NRC, Region III V. Stello, Jr. Office of I&E, NRC, Washington, D. C.

i i

t i

I i

- - - - - - - - - -