ML20084P408
| ML20084P408 | |
| Person / Time | |
|---|---|
| Site: | Oyster Creek |
| Issue date: | 05/14/1984 |
| From: | Fiedler P GENERAL PUBLIC UTILITIES CORP. |
| To: | Crutchfield D Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 8405180201 | |
| Download: ML20084P408 (2) | |
Text
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GPU Nuclear Corporation Nuclear
= = = 388 Forked River.New Jersey 08731-0388 609 971-4000 Writer's Direct Dial Number:
May 14, 1984 Mr. Dennis M. Crutchfield, Chief Operating Reactors Branch #5 Division of Licensing U.S. Nuclear Regulatory Commission Washington, DC 20555
Dear Mr. Crutchfield:
Subject:
Oyster Creek Nuclear Generating Station Docket No. 50-219 Containment Vent and Purge System
Reference:
Letter, P.B. Fiedler to D.M. Crutchfield, dated January 13, 1983 The purpose of this letter is to revise and expand the response submitted by the reference letter to item 4 of your January 4, 1982 inquiry into Oyster Creek's containment vent and purge system. Item 4 requested GPU Nuclear to provide information concerning the provisions to protect structures and safety-related equipment located downstream of the purge isolation valves against loss of function from the environment created by the escaping air and steam following a IDCA.
As it is now understood, the basis for NRC item 4 was the Branch Technical Position CSB 6-4, paragraph B.S.b.
'Inis position defines the safety-related equipnent to include ductwork that performs a safety function. Providing a delay time to start opening the filter inlet valve after 5 seconds will protect the SGTS from the pressure surge but will not protect the ductwork that is required to maintain the required negative pressure in the Reactor Building. Therefore, in order to protect the ductwork and the filter units and satisfy item 4, a relief vent will be installed in the 18" diameter drywell purge exhaust duct inside the reactor building. Any escaping air and steam that will be relievert/ released inside the building during a IDCA will eventually be picked up by the SGTS for iodine removal prior to release to the outside environs. Tue relief vent will open upon detection of excessive positive pressure in the 18" dinmeter duct, thereby protecting the ductwork connected to SGTS in the tunnel. Remaining escaping steam that managed
/Jd 8405180201 040514 PDH ADOCK 05000219 P
'sg GPU Nuclear Corporation is a subsidiary of the General Pubhc Utihties Corporation
- o. to get to the filter inlet valve is not high enough in moisture content to damage the filter train as any moisture in the steam will be filtered out by the pre-filter. Once the duct pressure is reduced to an acceptable level, the relief vent will close. This relief vent will be installed during the cycle 11 refueling outage.
If you have any questions, please contact me or the Oyster Creek Licensing Manager r.1 (609)971-4643.
Very truly yours, I
h
- A fU Petef B. Fiedler Vice President and Director Oyster Creek PBF:RJ: dam cc: Dr. Thomas E. Murley, Administrator Region I U.S. Nuclear Regulatory Comnission 631 Park Avenue King of Prussia, PA 19406 NRC Resident Inspector Oyster Creek Nuclear Generating Station Forked River, NJ 08731
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