ML20030C466
| ML20030C466 | |
| Person / Time | |
|---|---|
| Site: | Arkansas Nuclear  |
| Issue date: | 06/29/1981 |
| From: | Adam Wilson AFFILIATION NOT ASSIGNED |
| To: | Horton D ARKANSAS POWER & LIGHT CO. |
| References | |
| NUDOCS 8108260134 | |
| Download: ML20030C466 (2) | |
Text
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PRATT.
HENRY PRATT COMPANY ei ent ive es itii tt et ii ng I'< it I'luh !
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4o1 SOL *rli II!GIIIAND AVENUE AURORA. IllJNOIS 00007 June 29, 1981 O
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Arkansas Power & Light Co.
.L'G 2 51981 > 1 P.O. Box 551 i
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M Attention:
Mr. Donald Horton S'l 'M '
Quality Assurance Manager
Subject:
Licensing Event Report Arkansas Nuclear Unit #1 54" Pratt Containment Purge Valves Maximum Valve Opening Angles Gentlemen:
This letter is to document the verbal report made to you on June 26, 19 81, at 3 : 4 0 P.M., CDT.
It has been brought to our attention by the NRC that some nuclear plants have restricted the opening angle of purge valves based on prelimini, calculations indicating that a 650' maximum valve opening angle would be adequate to resist LOCA closing forces for large valves.
Several Pratt analyses considering sonic effects have indi-cated maximum valve opening angles of 30 to 55 depending on qpecific equipment and conditions to avoid exceeding the actuator manufacturer's rating and/or overstressing valve components.
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Accordingly, we recommend that a maximum valve opening angle of 30 (from full closed) be utilized for 48" and 0
54" Pratt containment purge valves pending a specific analysis
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Arkansas Power & Light Co.
Page 2 June 29, 1981 or your independent evaluation indicating greater maximum valve opening angles are suitable.
We are reviewing these analyses and will advise if a dif-ferent recommendation can be made.
Very truly yours, HENRY PRATT COMPANY
. 2 N 2 e--
A.K. Wilson Vice President & Manager of Engineering
/sw CC:
R. Kiessel - USNRC H.C. Schwenk G.A. Kurkjian T.J. Wrona
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