ML20024C285
| ML20024C285 | |
| Person / Time | |
|---|---|
| Site: | Limerick  |
| Issue date: | 07/06/1983 |
| From: | Kemper J PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC |
| To: | Schwencer A Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 8307120484 | |
| Download: ML20024C285 (3) | |
Text
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PHILADELPHIA ELECTRIC COMPANY 23O1 MARKET STREET P.O. BOX 8699 1931 -1981 PHILADELPHIA. PA.19101 1215)841-4502 July 6, 1983 v.cc encsmos, ENfetNE E RONG AND RESE ARCH Mr. A. Schwencer, Chief Docket No. 50-352 Licensing Branch No. 2 50-353 Division of Licensing U. S. Nuclear Regulatory Commission Washington, DC 20555
Subject:
Limerick Generating Station, Units 1 & 2 Anderson Greenwood Wetwell/Drywell Vacuum Breaker Test Program Reference.:
(1) Meeting, Philadelphia Electric Co. and NRC Containment Systems Branch, April 7, 1983 (2) Letter - D. M. O'Connor/Bechtel to Dr. R. W. Houston /NRC dated 6/17/83
Dear Mr. Schwencer:
On June 17, 1983, Bechtel Power Corporation, representing the Anderson-Greenwood Vacuum Breakers Test Program Owners Group, submitted to the NRC the material presented to the NRC Mechanical Engineering Branch and Containment Systems Branch staff personnel on June 7, 1983.
This material detailed the testing and analysis program completed to demonstrate the adequency of the redesigned vacuum breaker to perform its designated functions during and af ter being subjected to the pool swell and chugging phenomena.
Philadelphia Electric has elected to address the chugging phenomenon by capping the downcomers on which the wetwell/drywell vacuum breakers are mounted. The capping design is now in progress and installation on Unit 1 is planned for the end of 1983.
The pool swell phenomenon is being addressed by commitment to the following vacuum breaker modifications, which comprise the Owners Group III A program.
1.
New disk assembly design.
2.
Higher strength pivot shaft material.
I 3.
Increased pivot shaft bearing area.
l 4.
Single bar spring cylinder linkage.
5.
Utilization of the spring and actuating cylinders to dampen disk motion.
I 6.
Higher strength pivot arm assembly.
}
7.
Higher strength shaft and keys.
PDR ADOCK 05000352
!l l
8307120484 830706 A
- Details of the above design changes may be found in the material transmitted - to you by the reference (2) letter.
Anderson Greenwood has been requested to proceed with arrangements to modify the Limerick vacuum breakers so that the modified units may be installed on Unit 1 in early 1984.
By the above commitments and actions, PECo considers the NRC concerns regarding vacuum breaker disk impact velocities caused by poolswell and chugging to be satisfactorily resolved.
Sincerely yours, fM i
Copy to: See Attached Service List
cc: Judge Lawrence Brenner Judge Richard F. Cole Judge Peter A. Morris Troy B. Conner, Jr., Esq.
Ann P..Hodgdon Mr. Frank R. Romano Mr. Robert L. Anthony Mr. Marvin I. Lewis Judith A. Dorsey, Esq.
Charles W. Elliott, Esq.
Jacqueline I. Ruttenberg Thomas Y. Au, Esq.
Mr. Thomas Gerusky
' Director, Pennsylvania Emergency Management Agency Mr. Steven P. Hershey Donald S. Bronstein, Esq.
Mr. Joseph H. White, III David Wersan, Esq.
Robert J. Sugarman, Esq.
Ilartha W. Bush, Esq.
Spence W. Perry, Esq.
Atomic Safety and Licensing Appeal Board Atomic Safety and Licensing Board Panel Docket and Service Section i
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