ML20128M171
| ML20128M171 | |
| Person / Time | |
|---|---|
| Site: | Peach Bottom  |
| Issue date: | 06/20/1985 |
| From: | Stolz J Office of Nuclear Reactor Regulation |
| To: | Bauer E PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC |
| References | |
| GL-83-08, GL-83-8, NUDOCS 8507110593 | |
| Download: ML20128M171 (3) | |
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[Q p 2 01985 Dockets Nos. 50-277 AISTRIBUTION R
g L PDR GGears ORB #4 Rdg Gray File Mr. Edward G. Bauer, Jr.
HThomspon Vice President and General Counsel 0 ELD Philadelphia Electric Company EJordan 2301 Market Street JPartlow Philadelphia, Pennsylvania 19101
Dear Mr. Bauer:
SUBJECT:
DRYWELL TO SUPPRESSION CHAMBER VACUUM BREAKERS Re:
Peach Bottom Atomic Power Station, Units 2 and 3 By letter dated March 25, 1983, the Philadelphia Electric Company (PECo or the licensee) submitted its response to Generic Letter 83-08 (" Modification of Vacuum Breakers on Mark I Containments") dated February 2,1983, which was sent to all applicants and licensees for plants with Mark I containments.
In the Generic Letter, the staff requested information related to a potential failure mode of the drywell-to-torus vacuum breakers during the chugging and condensation oscillation phase of a loss-of-coolant accident. As stated in this submittal, a Peach Bottom plant unique report was prepared by Continuum Dynamic, Inc. (CDI) in September 1982. The licensee concluded that the wetwell to drywell vacuum breakers at Peach Bottom would not actuate during the chugging transients and, therefore, valve modifict.tions were not required.
Our review of the plant unique CDI report was deferred until completion of our review of the generic CDI reports that describe the models used to compute the vacuum breaker responses to chugging and condensation oscillation events. The staff has completed its review of this generic CDI report and transmitted its evaluation report to General Electric by letter dated December 24, 1984.
We have also completed a review of the Peach Bottom plant unique report and find it uses the same methodology that the staff found generically acceptable. However, we were unable to determine if the analyses supporting the Peach Bottom plant unique report were in conformance with the restrictions set forth in Section V of the staff's generic evaluation of the CDI reports, cited above.
In a letter dated May 14, 1985, the licensee provided its response to our request for additional information, dated April 22, 1985, regarding these restrictions.
Based upon our review of the licensee's submittals, we conclude that the analyses perfomed to predict the differential pressure loads across the vacuum breakers and the corresponding actuation velocities were performed using the generically acceptable methodology. Therefore, we concur in the licensee's conclusion that the valve opening and closing velocities are within the design capabilities of the vacuum breaker valves and that no 8507110593 850620 PDR ADOCK 05000277 P
Mr. Bauer design modifications are needed.
This completes our review of Multiplant Action Item D-20 (Mark I Drywell Vacuum Breakers) for the Peach Bottom facilities.
If you have any questions concerning our review, please contact your Project Manager, (Gerry Gears at (301) 492-8362).
Sincerely,
" oc c u m.. _., s z JMAi1.S;to;a John F. Stolz, Chief Operating Reactors Branch #4 Division of Licensing cc: See next page J
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Mr. E. G. Bauer, Jr.
Peach Bottom Atomic Power Station, Philadelphia Electric Company Units 2 and 3 cc:
Mr. Eugene.J. Bradley Mr. R. A. Heiss, Coordinator Assistant General Counsel Pennsylvania State Clearinghouse Philadelphia Electric Company
' Governor's Office of State Planning 2301 Market Street and Development Philadelphia, Pennsylvania 19101 P.O. Box 1323 Harrisburg, Pennsylvania 17120 Troy B. Conner, Jr., Esq.
1747 Pennsylvania Avenue, N.W.
Mr. Thomas M. Gerusky, Director Washington, D.C.
20006 Bureau of Radiation Protection Pennsylvania Department of Thomas A. Deming, Esq.
Environmentcl Resources Assistant Attorney General P.O. Box 2063 Department of Natural Resources Harrisburg, Pennsylvania 17120 Annapolis, Maryland 21401 Mr. Albert R. Steel, Chairman Philadelphia Electric Company Board of Supervisors Mr. R. Fleishmann Peach Bottom Township Peach Bottom Atomic R. D. #1 Power Station Delta, Pennsylvania 17314 Delta, Pennsylvania 17314 Mr. M. J. Cooney, Superintendent General Division - Nuclear Philadelphia Electric Company 2301 Market Street Philadelphia, Pennsylvania 19101 Pr. Anthony J. Pietrofitta, General Manager Power Production Engineering Atlantic Electric P. O. Box 1500 1199 Black Horse Pike Pleasantville, New Jersey 08232 Mr. Thomas Johnson U.S. Nuclear Regulatory Comission Peach Bottom Atomic Power Station P.O. Box 399 Delta, Pennsylvania 17314 Mr. Thomas E. Murley, Regional Administrator U.S. Nuclear Regulatory Commission, Region I 631 Park Avenue King of Prussia, Pennsylvania 19406 a