ML19322A926
| ML19322A926 | |
| Person / Time | |
|---|---|
| Site: | Oconee  |
| Issue date: | 08/01/1975 |
| From: | Parker W DUKE POWER CO. |
| To: | Moseley N NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| Shared Package | |
| ML19322A925 | List: |
| References | |
| NUDOCS 7911270804 | |
| Download: ML19322A926 (2) | |
Text
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August 1, 1975 ViCg Pats.cc=v Trtemouc: asta 7c4 S*ta= Paoover'o=
373-4083 Mr. Norman C. Moseley, Director U. S. Nuclear Regulatory Cornission Suite 818 230 Peachtree Street, Northwest Atlanta, Georgia 30303 Re:
IE:lI:TNE 50-269/75-1 50-270/75-1 50-287/75-1
Dear Mr. Moseley:
Information has been provided concerning the resolution of probic s associated with the process radiation monitors at the Oconee Nuclear Station in cur letters of May 24, 1974, September 9, 1974, Novc=ber 27, 1974, February 14, 1975, March 26, 1975, April 30, 1975, and Yay 30. 1975.
As previcusly stated and confir:cd by your subsequent inspecticas, the proble s with the liquid waste process conitors, RIA-33 and RIA-34, and the iodine conitora, RIA-44 and RIA-48, have been resolved.
The =cdificaticn to percit an air purge to clear the waste gas conitors, RIA-37 and RIA-38, after a waste gas decay tank
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release and to install a sample line in parallel with the conitor to allow grab sa ples to be taken at the tenitor is in progress.
This ::dification will be ccepleted by November 1, 1975, and should resolve the existing pre-ble=s with these conitors.
The particulate conitors, RIA-43 and RIA-47, were initially believed to be unreliable, as reported in R0(IE) Report 50-269/74-2 and 50-270/74-2 dated May 3, 1975.
This was because a correlation could net then be established between the continuous conitor and laboratory analysis of the particulate filter removed fro: these =onitors.
An extensive investigatien has been perforced to deter =ine the reason for this inconsistency.
This investigation-has shewn the particulate conitors to be reliable and to be capa' ale of early detection of changing particulate activity.
A correlatien between the tenitor and lab sample has been obtained in several isclated instances; however, gced, continuous correlation does not appear feasible. This is due to the presence 4
of high energy, beta-critting, short half-life en crials such as Rubidiu: SS which affect the particulate conitor but decay before the laboratory analysis can be cc:pleted.
Grab sa:ples have been and will be taken as required by Technical Specifi-cation 3.10.7.
RIA-43 and RIA-47 provide a reliable qualitative indication
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Pag 2 2 Mr. Narman C. Moseley
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of changing particulate activity and therefore are useful as a continuous monitor.
Therefore it is considered that this item is resolved.
Ve truly yours, l
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William O. Parker, Jr MST:ge
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