ML20132C245

Recommends Using Listed Accident X/Q Values in Ser. Evaluation Supersedes Preliminary Evaluation Transmitted in 840106 Memo.X/Q Values Considered Final,Unless Exclusion Area Boundary Distance Found Incorrect

ML20132C245
Person / Time
Site:	Beaver Valley
Issue date:	07/05/1984
From:	Spickler I Office of Nuclear Reactor Regulation
To:	Quay T Office of Nuclear Reactor Regulation
Shared Package
ML19283C868	List: IA-85-926, Forwards Rept of 840726-27 in-progress Audit Re Detailed Control Room Design Review (Dcrdr).Dcrdr Proceeding Satisfactorily.Concern Expressed Re Differences Between Unit 1 & 2 Control Rooms & Role of Human Factors Specialist ML20132B767 ML20132B791 ML20132C010 ML20132C076 ML20132C105 ML20132C131 ML20132C209 ML20132C245 ML20132C247 ML20132C253 ML20132C285 ML20132C290 ML20132C295 ML20132C301 ML20132C310 ML20132C323 ML20132C334 ML20132C338 ML20132C344 ML20132C365 ML20132C379 ML20132C383 ML20132C389 ML20132C394 ML20132C421 ML20132C427 ML20132C433 ML20132C442 ML20132C453 ML20132C459 ML20132C464 ML20132C468 ML20132C474 ML20132C479 ML20132C484 ML20132C487 ML20132C493 ML20132C499 ML20132C512 ML20132C518 ML20132C536 ML20132C542 ML20132C559 ML20132C569 ML20132C575 ML20132C633 ML20133M691 ML20133P834
References
FOIA-84-926 NUDOCS 8407110459
Download: ML20132C245 (2)

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JUL 0 5 384 Docket No. 50-412 MEMORANDlH FOR: Theodore R. Quay. Leader Systems Analysis Section AEB FROM: Irwin Spickler, Leader Meteorology Section, METB

SUBJECT:

ACCIDENT X/Q VALUES FOR BEAVER VALLEY, UNIT NO. 2 We have completed our evaluation of accident X/Q values for Beaver Valley, Unit No. 2. We recommend using the following values in the Safety Evaluation Report:

3 Time Period Distance (m) Direction X/Q (sec/m )

0-2 hours 455 (EAB) NW 2.4 x 10 0-8 hours 5800 (LPZ) NW 8.8 x 10" ~

8-24 hours 5800 (LPZS NW 6.4 x 10 1-4 days 5800 (LPZ) NW 3.2 x 10-5 4-30 days 5800(LPZ) NW 1.2 x 10~0 This evaluation supersedes our preliminary evaluation transmitted to you in my 1/6/84 memorandum. The maximum X/Q value at the exclusion area boundary remains unchanged from the preliminary evaluation, while the X/Q values at the Low Population Zone distance have increased slightly (about 10%).

The X/Q values were calculated in accordance with Regulatory Guide 1.145, using five years (1977-1981) of onsite meteorological data. Wind speed and direction data were based on measurements at the 10.7m level, and atmospheric stability was defined by the vertical temperature difference measured between the 45.7m and 10.7m levels. As with our preliminary evaluation, the exclusion area boundary distance (455m) and low population zone distance (5800m) were taken from the FSAR. A building wake correction factor (cA) of 800m 2 was used in the computations. The annual average X/Q values (used in the determination of X/0 values for the various time periods at-the LPZ distance) were adjusted by site-specific factors prwided by the applicant.

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JUL 0 5 584 T. R. Quay These X/Q values are considered as final unless the exclusion area boundary distance and/or LPZ distance are found to be incorrect. Questions regarding this review should be directed to E. Markee at x27635.

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i Irwin Spickler, Leader Meteorology Section Meteorology and Effluent Treatment Branch cc: L. Hulman W. Gammill X. Dempsey E. Markee DISTRIBUTION:

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