ML20127L661
| ML20127L661 | |
| Person / Time | |
|---|---|
| Site: | Vogtle  |
| Issue date: | 05/17/1985 |
| From: | Bailey J GEORGIA POWER CO. |
| To: | Adensam E Office of Nuclear Reactor Regulation |
| References | |
| GN-618, NUDOCS 8506280087 | |
| Download: ML20127L661 (2) | |
Text
a
'e Georgia Power Company.
Routa 2. Box 299A W1yn0sboro, Georgia 30830 Telephone 404 554-9961 404 724-8114 Southern Company Services, Inc.
Post Office Box 2625 Birmingham, Alabama 35202
. Telephone 205 870-6011 May 17, 1985 i.
'~
Director of Nuclear Reactor Regulation File: X7BC35 Attention:
Ms. Elinor G. Adensam, Chief Log:
GN-618 Licensing Branch #4 Division of Licensing U. S. Nuclear Regulatory Commission Washington, D.C.
20555 NRC DOCKET NUMBERS 50-424 AND 50-425 CONSTRUCTION PERMIT NUMBERS CPPR-108 AND CPPR-109 V0GTIE. ELECTRIC GENERATING PLANT - UNITS 1 AND 2 REQUEST FOR ADDITIONAL INFORMATION: QUESTION 460.08 PART G
Dear Mr. Denton:
Your staff requested additional information on the quality assurance criteria for radiological effluent monitors providing a signal for the actuation of a system used to reduce releases of radioactive materials.
This~information is enclosed.
If your staff requires any additional information, please do not hesitate
.to contact me.
Sincerely,
. h.
J. A. Bailey Project Licensing Manager JAB /cas
. Enclosure xc. D. O. Foster L. T.'Gucwa R. A. Thomas G. Bockhold, Jr.
J. E. Joiner, Esquire T. Johnson (w/o enclosure)
B. W. Churchill, Esquire D..C. Teper (w/o enclosure)
L M. A.' Miller L. Fowler B. Jones, Esquire (w/o enclosure)
Vogtle Project File 0205m-
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A PDR go'. d n
o VEGP-FSAR-Q intermediate setpoint, a visual indication will alert plant personnel of the monitor reading.
If the high setpoint is reached, an alar will be annunciated that requires operator acknowledgment.
The high alarm setpoint will also trigger the control function for those monitors so equipped.
In determining setpoints the following two arbitrary rules were adopted:
1.
The intermediate setpoint must be at least 2 times the detector sensitivity to avoid alerts caused by
" noise" at the low end of the detector's range.
2.
The high setpoint must be at least 1.5 times the low setpoint.
It should be noted that the setpoints developed are
" initial" and are subject to modification as plant operating experience is developed.
To provide conservative initial alarm setpoints, the following prescription was adopted.
First, the MPRCs were divided by 3, thereby limiting each path to one-third the allowable release.
The initial high alarm setpoint was then selected at one-half the reduced MPRC, and the initial intermediate setpoint was chosen as one-tenth
-s the high setpoint.
However, due to available range limitations (especially for particulate monitors), it was not possible to set the high setpoint equal to one-half the MPRC and still adhere-to the two rules discussed above.
The initial setpoints specified for the effluent monitors are shown in table 11.5.2-4.
Similar logic was followed for the liquid effluent monitors.
Table 1 in Appendix ll.5-A of Standard Review Plan 11.5 references Regulatory Guide 1.143 for quality assurance criteria. Although the quality assurance criteria set forth in Regulatory Guide 1.143 were not followed specifically, the criteria presented in the " Westinghouse Electric Corporation Water Reactor Divisions Quality Assurance Plan,""
WCAP-8370/7800, Rev.10A/6A, which has been approved by the NRC, were employed and meet the intent of Regulatory Guide 1.143.
Q460.08-8 Amend. 5 4/84