ML19260C125
| ML19260C125 | |
| Person / Time | |
|---|---|
| Site: | Peach Bottom  |
| Issue date: | 12/11/1979 |
| From: | Daltroff S PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC |
| To: | Ippolito T Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 7912180606 | |
| Download: ML19260C125 (2) | |
Text
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'. '7' PHILAD ELPHIA ELECTRIC COM PANY 2301 M ARKET STREET P.O. BOX 8699 PHILADELPHIA. PA.19101 SHIELDS L. D ALTROFF ELECTR Pm uc to*e December 11, 1979 Re: Docket Nos. 50-277 50-278 Mr.
T.
A.
Ippolito, Chief Operating Reactors Branch #3 Division of Operating Reactors U.S. Nuclear Regulatory Commission Washington, DC 20555
References:
a)
T.
A.
Ippolito (NRC) letter toe.
G.
Bauer (PECO) dated November 29, 1978 b)
T.
A.
Ippolito (NRC) letter toe.
G.
Bauer (PECO) dated October 22, 1979 c)
J.
W.
Gallagher (PECO) letter t o D.
G.
Eisenhut (NRC) dated October 25, 1979
Dear Mr. Ippclito:
This is in response to yoar letter to E.
G.
Bauer dated October 22, 1979, regarding containment purging and venting during normal operation.
This topic has been the subject of a continual dialogue between the NRC, PECO, and our valve manufacturers since receipt of your November 29, 1978, letter.
The following is our complete reply to your latest letter.
In accordance with y our reques t, PECO will operate in conformance with the NRC's suggested " Interim Position for Containment Purge and Vent Valve Operation Pending Resolution of Isolation Valve Operability".
The use of the large diameter purge and vent valves during p ower operation will be minimized and shall not exceed 90 hours0.00104 days <br />0.025 hours <br />1.488095e-4 weeks <br />3.4245e-5 months <br /> per year, except when purging is being performed in the " batched" mode.
The valves shall be limited to a maximum of 37 degrees open wherever the reactor is not in the cold shutdown or refueling mode.
This maximum opening has been conservatively determined in consultation with the valve supplier such that the isolation function can be successfully carried out in the required time period under DBA - LOCA loads.
These limitations shall apply to the following valves:
/iO3Y s
1614 302 2912180 6 "
jo
.'. -r Mr.
T.
A.
Ippolit Page 2 UNIT 2 UNIT 3 A0-2505 A0-3505 A0-2506 A0-3506 A0-2507 A0-3507 A0-2511 A0-3511 A0-2512 A0-3512 A0-2519 A0-3519 A0-2520 A0-3520 A0-2521A,B A0-3521A,B We have been actively pursuing the qualification of the large diameter purge and vent. valves since our meeting with the NRC Staff in Bethesda, Maryland, on August 24, 1979.
As a part of'these efforts, letters were sent to Bechtel Power Corporation and Fisher Controls Company on September 20, 1979, and September 21, 1979, requesting that they immediately begin the required analyses.
Our recent letter dated October 25, 1979, from J. W.
Gallagher (PECO) to D.
G. Eisenhut (NRC) concerning containment purging and venting during normal operation committed to the c omp le ti on of our valve qualification efforts by April 30, 1980, and elaborated on the scope of these efforts.
Our re-evaluation of valve performance will include consideration of the concerns identified in IE Bulletin 79-01A, as appropriate.
Very truly yours,
/xey
/. (
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