ML19208B316
| ML19208B316 | |
| Person / Time | |
|---|---|
| Site: | Zion File:ZionSolutions icon.png |
| Issue date: | 08/20/1979 |
| From: | Schwencer A Office of Nuclear Reactor Regulation |
| To: | Reed C COMMONWEALTH EDISON CO. |
| References | |
| NUDOCS 7909200010 | |
| Download: ML19208B316 (3) | |
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NUCLEAR REGULATORY COMMISSION 30
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August 20, 1979 Docket tios. 50-295 and 50-304 Mr. Cordell Reed Assistant Vice President Commonwealth Edison Company Post Office Box 767 Chicago, Illnois 60690
Dear Mr. Reed:
We are reviewing your containment purge system and containment venting system justification for containment purging and venting at Zicn Station, Unit No. 1 and :40. 2 which was submitted by your letters dated January 2, July 2, and July 5, 1979.
We find that we need the enclosed additional information before we can complete our review.
You are requested to provide the information identified in the enclosure within 60 days of receipt of this letter in order that we may expeditiously complete our review of this matter.
Sincerely, f
hit <O/O G A. Schwencer, Chief Operating Reactors Branch #1 Division of Operating Reactors
Enclosure:
Request for Additional Information cc: w/ enclosure See next page Y
vf 7909200 O h
ENCLOSURE REQUEST FOR ADDITIONAL INFORMATION FOR CONTAINMENT PURGE SYSTEM AND CONTAINMENT VENTING SYSTEM FOR ZION STATION UNITS 1 AND 2 DOCKET NOS. 50254/265 1.
With regard to the containment purge and venting system, provide the following information:
a.
Discuss the provisions made to ensure that isolation valve closure will not be prevented by debris which could potentially become entrained in the escaping air and steam.
b.
Discuss the provisions made for testing the availability of the isolation function and the leakage rate of the isolation valves, individually, during reactor operation.
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c.
Provide an analysis to demonstrate the acceptability of the provisions made to protect structures and safety-related equipment, e.g.,
fans, filters and ductwork, located beyond the purge system isolation valves against loss of function from the environment created by the escaping air and steam, d.
Specify the allowable leak rates of the purge and vent isolation valves for the spectrum of design basis pressures and flows against which the valves must close.
e.
Specify the amount of containment atmosnhere released through the purge and vent isolation valves during the time required for them to close following a LOCA.
2.
During our review of the e.lectrical bypass / override features for the purge isolation valves, circuit design deficiencies have been identified (and made known to you).
Please describe (including appropriate electrical diagrams) the design changes ycu propose.
Discuss these changes with regard to the electrical-criteria stated in ou,r November 28, 1978 letter.
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Mr. Cordell Reed Commonwealth Edison Company cc: Robert J. Volle.1, Esquire 109 North Dearborn Street Chicago, Illinois 60602 Dr. Cecil Lue-Hing Director of Research and Development Metropolitan Sanitary District of Greater Chicago 100 East Erie Street Chicago, Illinois 60611 Zion-Benton Public Library District 2600 Emmaus Avenue Zion, Illinois 60099 Mr. Phillip P. Steptoe Isham, Lincoln and Beale Counselors at Law One First National Plaza 42nd Floor Chicago, Illinois 60603 Susan N. Sekuler, Esquire Assistant Attorney General Environmental Control Division 188 West Randolph Street, Suite 2315 Chicago, I'llinois 60601
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