ML20064M700

Corrected Amend 159 to License NPF-7,revising Page B 3/4 7-7 to Reflect Changes Issued by Previous License Amend

ML20064M700
Person / Time
Site:	North Anna
Issue date:	03/21/1994
From:	Office of Nuclear Reactor Regulation
To:
Shared Package
ML20064M701	List: ML20064M700
References
NUDOCS 9403280343
Download: ML20064M700 (1)

Text

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PLANT SYSTEMS mseS 3/4.7.11 SEAi m SOURCE ra ITNMNATION The limitations on sealed source removable contar..laation ensure that the total body or individual organ irradiation does not exceed allowable limits in the event of ingestion or Inhalation of the source material. The limitations on removable contamination for sources i

requiring leak testing, including alpha emitters, is based on 10 CFR 70.39(c) limits for plutonium. Sealed sources are classified into three groups anording to their use, with l surveillance requirements commensurate with the probability of damage to a source in that gr'oup. Those sources which are frequently handled are required to be tested more otten than those which are not. Sealed sources which are continuously enclosed within a shielded mechanism (i.e., sealed sources within radiation monitoring or boron measuring devices) are cor.sidered to be stored and need not be tested unless they are removed from the shielded mechanism.

3/4.7.12 SETTl_EMENT OF Cl_ ASS 1 STRUCTURES In order to assure that settlement does not exceed predicted and allowable settlement values, a program has been established to conduct a survey of a specified number of points at the site on 4

a semi annual basis. The first survey was conducted in May 1976 to establish baseline elevations for most of the points. Where applicable, the base line elevations of points established subsequent to the May 1976 survey have been adjusted to the May 1976 survey by an evaluation of the settlement records of settlement points on the same structure or on nearby structures. Baseline elevations for some points were astablished on dates other than May 1976 as indicated in Table 3.7 5.

Additional surveys will be performed semi annually.

The determination of the elevation of the points located in the immediate vicinity of the Service Water Reservoir shall be by precise leveling with second-order Class 11 accuracy as defined by the U.S. Donartment of Commerce. National Oceanic and Atmosoheric Administration. National Ocean Survev.1974.

The change in elevation of points 113 and 117 in the main plant area shall be determined by direct measurement from a single instrument set up. A difference in survey rod readings from the single set up will establish an initial difference in elevation between the two points.

Subsequent reading will determine if there is a change in the initial difference, indicating additional differential movement. Because the differential movement between points 113 and 117 have previously approached the allowable limit, the direct reading method will provide the most accurate data and will minimize random survey error associated with survey loops. The direct reading method will involve equipment and will produce results that are comparable to second-order Class ll accuracy.

NORTH ANNA - UNIT 2 B 3/4 7 7 Amendment No.-447,159 9403280343 940321 PDR ADOCK 05000338 P

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