ML20009F917
| ML20009F917 | |
| Person / Time | |
|---|---|
| Site: | Summer  |
| Issue date: | 07/29/1981 |
| From: | Nichols T SOUTH CAROLINA ELECTRIC & GAS CO. |
| To: | Harold Denton Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 8108030163 | |
| Download: ML20009F917 (2) | |
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I south CAROLINA ELECTRIC a gas COMPANY 4
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Mr. Harold R. Denton, Director Office of Nuclear Reactor Regulation A
U. S. Nuclear Regulatory Commission u[{
Washington, D. C. 20555
Subject:
Virgil C. Summer Nuclear Station Docket No. 50/395 TMI Item II.D.1 PORY Block Valves
Dear Mr. Denton:
At the request of Mr. William Kane, South Car 311na Electric and Gas Company provides the following information regarding the PORY block valves for the Virgil C. Summer Nuclear Station.
As discussed in our letter to Mr. Denton dated March 25, 1981, and in FSAR Section 5.5.13.4, PORY block valves similar to those located at Summer Station were to be tested at Duke Power's Marshall Steam Plant.
Westinghouse type 3GM88 valves, the exact model located at Virgil C.
Summer Nuclear Station, were tested at the Marshall Steam Plant.
Initial test results were unacceptable as the valves failed to close during full flow conditions. As instructed by Westinghouse a design modification was made and subsequent testing proved successful.
The modification involved changing the valve operation from torque to limit control.
As indicated in our response to NRC I&E Bulletin 81-02 dated July 7, 1981, the same modification was made to the Virgil C. Summer Nuclear Station valves.
Additional in plant tests will be parformed at Virgil C. Summer Nuclear Station during our next hot functional testing scheduled to start in mid September.
These tests will involve cycling the block nlve with the associated PORY open at normal operating conditions.
If you require additional information, please let us Enow.
Yours very truly, T. C. Nichols, Jr.
fgQ e10sO30163 810729 PDR ADOCK 05000
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Mr. Harold R. Denton July 28, 1981 Page 2 RBC:TCN:lkb cc:
Y. C. Summer G. H. Fischer H. N. Cyrus T. C. Nichols, Jr.
J. C. Ruoff D. A. Nauman W
A. William, Jr.
R. B. Clary O. S. Bradham A. R. Koon M. N. Browne B. A. Bursey J. L. Skolds J. B. Knotts, Jr.
J. B. Cookinham H. E. Yocom NPCF File I
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