ML20132C041

Informs That Occurrence of Barometric Pressure Deviation from Average Pressure at Site of Greater than 0.5 Psi Extremely Unlikely.Use of 0.5 Psi in Determining Setpoints Would Encompass Range of Conditions Expected at Site

ML20132C041
Person / Time
Site:	Grand Gulf
Issue date:	04/17/1984
From:	Gammill W Office of Nuclear Reactor Regulation
To:	Adensam E Office of Nuclear Reactor Regulation
Shared Package
ML19276B572	List: AECM-84-0182, Informs of Intent to Restart Plant on or Before 840326 to Regenerate Units Installed in-core Startup Neutron Sources. Util Believes Immediate Restart & Operation of Plant at Power Levels of Less than 5% Core Thermal Power Is Safe AECM-84-0192, Clarifies Response to Question Written in Transcript of Commission 840320 Briefing Re Development of Tech Specs. Util Comparing Tech Specs to Fsar,Ser & Present Version of STS ML19276B571 ML19292C771 ML20132B781 ML20132B804 ML20132B820 ML20132B826 ML20132B831 ML20132B837 ML20132B841 ML20132B847 ML20132B893 ML20132B925 ML20132B930 ML20132B938 ML20132B943 ML20132B947 ML20132B964 ML20132B968 ML20132B974 ML20132B977 ML20132B985 ML20132B990 ML20132B995 ML20132C002 ML20132C007 ML20132C027 ML20132C030 ML20132C036 ML20132C041 ML20132C046 ML20132C052 ML20132C056 ML20132C060 ML20132C065 ML20132C070 ML20132C082 ML20132C089 ML20132C095 ML20132C113 ML20132C121 ML20132C126 ML20132C136 ML20132C149 ML20132C161 ML20132C165 ML20132C171 ML20132C178 ML20132C182 ... further results
References
FOIA-84-459 TAC-54670, NUDOCS 8405020517
Download: ML20132C041 (1)

Text

v.2 8:8cg E(

, o,,

UNITED STATES

• W,lj ),(

g NUCLEAR REGULATORY COMMISSION s

E WASHINGTON, D. C. 20555 s, w/,:j

+...+

APR 17 EN Docket No. 50-416 MEMORANDUM FOR: TTfHhz2rf5Huni? Chief Licensing Branch No. 4, DL FROM:

William P. Gammill, Chief Meteorology and Effluent Treatment Branch, DSI

SUBJECT:

PROPOSED AMENDMENT TO OPERATING LICENSE FOR GRAND GULF, UNIT N0. 1, DATED APRIL 7, 1984 - ITEM 4 (TAC N0. 54670)

In response to a verbal request from L. Kintner on April 12, 1984, we have reviewed the portion of the proposed amendment pertaining to containment issues (Item 4). More specifically, the use of negative barometric pressure change of 0.50 psi to the set point of the drywell/ containment pressure instrumentation was requested by the Licensee.

Data records at the National Weather Service Station at Jackson, MS, based on barometric pressure readings at 0000 and 1200 GMT for the period from 1946 to the present, show a difference of about 0.75 psi between the highest and lowest values. This information was based on a telephone conversation between Mr. Rochat, the duty forecaster at Jackson, MS, and E. Markee, Meteorology Section.

Based on this information, the occurrence of a barometric pressure deviation from the average pressure at the site of greater than 0.5 psi is extremely unlikely and use of 0.5 psi in determining setpoints would encompass the range of conditions expected at the site.

This evaluation was performed by E. Markee, Meteorology Section. Any questions about this evaluation should be addressed to Mr. Markee on extension 27635.

D. N.

William P. Gammill, Chief Meteorology and Effluent Treatment Branch Division of Systems Integration cc:

R. Mattson D. Muller R. Capra L. Kintner qA D. Hoffman 9r

~

D. Houston p$

Cf

/G i