ML20050C818
| ML20050C818 | |
| Person / Time | |
|---|---|
| Site: | Zion File:ZionSolutions icon.png |
| Issue date: | 04/02/1982 |
| From: | Lentine F COMMONWEALTH EDISON CO. |
| To: | Harold Denton Office of Nuclear Reactor Regulation |
| References | |
| RTR-NUREG-0660, RTR-NUREG-660 3786N, NUDOCS 8204090379 | |
| Download: ML20050C818 (2) | |
Text
O Commonwealth Edison
) one First National Plaza Chgo, llhnois V] 7 Address Reply to: Post Office Box 767 Q Chicago, Illinois 60690 April 2, 1982 q
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Mr. Harold R.
Denton, Director g
Of fice of Nuclear Reactor Regulation RECEIVED U.S. Nuclear Regulatory Commission I:
Washington, DC 20555 Bj b ;)
Subject:
Zion Station Units 1 and 2 nu J
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TMI Lessons Learned Category A Item, " Integrity o f Systems m
P Outside Containment" NHC Docket Nos. 50-295 & 50-304 Reference (a):
Ja nuary 1, 1980, letter from D.
L.
People s t o H. R. De n to n.
(b):
July 2, 1980, letter from D.
G.
Eisenhut to All PWR Licensees.
(c):
April 20, 1981, letter from 3.
A.
Va rg a t o J. S. Abel.
Dear Mr. Denton:
Re ference (a) provided a description o f the program under-taken by Commonwealth Edison to address the TMI Lessons Learned Category A item 2.1.6.a,
" Integrity o f Systems Outside Containment."
Reference (b) requested that the Zion operating licenses be modified by the addition o f a license condition mandating the establishment o f such a program.
That license anendment was issued by transmittal of reference (c).
This letter is submitted to inform you of a modification to the description of the Leak Reduction and Control Program as contained in reference (a).
Specifically, Appendix I to reference (a) listed the plant systems that were to be leak tested and the methods used to test them.
For Zion, the program specified a leak test of the waste gas system by the pressure decay method to be conducted each refueling outage.
Since the program was first formulated in December, 1979, we have made several improvements that have enhanced our ability to detect and quantify waste gas system leakage at Zion Station.
Signi-ficant among these has been the implementation o f a surveillance program that determines the mass inventory in the waste gas system Oh 8204090379 820402 9
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DR ADOCK 05000295 PDR
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H. R. Denton April 2, 1982 on a daily basis.
Totalizing flow meters have been installed to
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. monitor nitrogen in-leakage to the system to ensure the accuracy of the mass inventory determination.
This program has enabled us to detect ' leakage with greater sensitivity than can be obtained by conventional pressure decay methods.
In addition, Zion has acquired the capability to apply helium leak detection techniques to a variety of plant systems.
Should the inventory calculations indicate a leakage problem in the waste gas system, the helium leak detection technique can quickly be brought to hear to determine the source of the leakage.
'Therefore, in view of our aggressive program to closely monitor and correct waste gas system leakage, Commonwealth Edison has elected to delete the pressure-decay test o f the waste gas system from our Leak Reduction and Control Program.
It should be emphasized that we continue to consider our program to be in full compliance with our license condition and the intent of the TMI Lessons Learned requirement.
Please address questions regarding this matter to this Very truly yours, i
fh F.
G.
Lentine Nuclea r Licensing Administrator 1m 3786N f
r s