ML20155F191

Summary of 740430 & 0502 Meetings W/Util in Bethesda,Md Re Applicant Proposed Rev to Combustible Gas Control Sys Design

ML20155F191
Person / Time
Site:	Grand Gulf, 05000000
Issue date:	05/14/1974
From:	Owsley G US ATOMIC ENERGY COMMISSION (AEC)
To:	US ATOMIC ENERGY COMMISSION (AEC)
Shared Package
ML20155E140	List: ML20155E133 ML20155E182 ML20155E227 ML20155E338 ML20155E354 ML20155E367 ML20155E405 ML20155E430 ML20155E447 ML20155E473 ML20155E503 ML20155E550 ML20155E557 ML20155E565 ML20155E578 ML20155E600 ML20155E714 ML20155E728 ML20155E753 ML20155E770 ML20155E794 ML20155E948 ML20155E967 ML20155E986 ML20155F001 ML20155F053 ML20155F176 ML20155F191 ML20155F203 ML20155F217 ML20155F228 ML20155F252 ML20155F279 ML20155F302 ML20155F332 ML20155F378 ML20155F477 ML20155F485 ML20155F516 ML20155F534 ML20155F545 ML20155F560 ML20155F589 ML20155G308
References
FOIA-88-91 NUDOCS 8806160309
Download: ML20155F191 (5)

Text

e 4 t' e *e, UNITED STATES

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,1 ATOMIC ENERGY COMMISSION U * ".. '

W ASHINGToN. D.C. 20545 i gh 14 B74 k IgqiN Docket No. 50-416/417 Applicant: Mississippi Power & Light Company Facility: Grand Gulf Nuclear St- ion, Units 1 and 2

SUMMARY

OF MEETINGS WITH MISSISSIPPI POWER & LIGHT COMPANY ON APRIL 30,1974 AND MAY 2,1974 The staff met with the Missippi Power & Light Co. (MP&L) representatives on April 30,1974 and on May 2,1974, in Bethesda. The lists of attendees for these ineetings are provided as Enclosures 1 and 2.

The purpose of the April 30 meeting was to consider the applicant's proposed revision to its combustible gas control system design. The applicant proposes to make this design modification contingent upon the planned revision to

. Regulatory Guide 1.7. The principal feature of this design change would be to force the dry well atmosphere following a LOCA, through the suppression pool, using compressors which can receive their power from the emergency electrical system. The staff concluded from the presentation by the applicant that the design concept is acceptable and that it can be engineered to meet acceptable criteria. Advantages of the system compared with that proposed to meet the present Regulatory Guide 1.7 requirements are as follows:

1. a reduction from 7 to 4 penetrations through the dry well wall for the combustible gas control system;

2. a maximum penetration size of 10 inches compared with 24 inches in the present design;

3. the containment atmosphere would not bypass the suppression pool as in the present design; and

4. the bypass available in the event any single penetration is left open by valve failure would not exceed the allowable bypass from any dze l pipe break. In addition, with the design basis LOCA (double-endea I break) all four penetrations could be left open and the bypass area I would not result in overpressurization of the containment.

The applicant's proposed guard pipe design and criteria which had been filed in draft form, were found to be acceptable. The applicant plans to file this information formally before May 9,1974.

l 9806160309 080606 PDR FOIA CONNOH88-91 PDR ,

MAY 11 1974 The staff reported that it had found the General Electric Company's analysis of vent uncovery following a LOCA to be acceptable. Basically, the staff found that the potential for excessive bypass was acceptably low. However, the staff -

also reported that it was not satisfied with the General Electric Company's analysis of forces generated in the suppression pool area from possible wave effects . At this meeting, the General Electric Company provided further infor-mation regarding forces generated in the suppression pool from wave action.

This additional information was subsequently reviewed by the staff.

The staff met with MP&L on May 2,1974 to discuss the applicant's response to information requested by the ACRS in its staff's letter of April 2,1974, regarding containment matters. The Regulatory Staff is in substantial agreement with -

the information which has been developed by the applicant. A copy is enclosed.

'/

• /dnb /N>h G. F. Owsley /

Project Manager Light Water Reactors Branch 1-2 Directorate of Licensing

Enclosures:

(1) List of Attendees, April 30, 1974 Meeting (2) List of Attendees, May 2,1974 Meeting (3) "Mark III Pressure Suppression System Loads on Structures" l

l 1

4

- , , - - , . . . ,l', - - .

d ATTENDANCE AT MEETING OF 4/30/74 Name Org.

. G. Owsley AEC J. Orndoff AEC R. L. Ashley Bechtel T. W. Habermas Bechtel D. Heilig Bechtel R. Bower Bechtel V. Bert Bechtel 9

J. Parikh Bechtel M. C. Mauderly Bechtel C. L. Reid Bechtel i

N. B. Willoughby Bechtel F. C. Hatch G.E.

L. J. Sobon G.E.

J. P. McGaughy MP&L I

1 i

i l

2  !

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. _ _ . . - . . . . - . . . . . . . _ _ . - . _ , _ _ _ _ . _ - - . . . _ _ _ _ _ . , , -.. _ ., _ . , , 7._,

4 3 ATTENDANCE AT MEETING'0F S/2/74 ,

Name Org.

G. Owsley AEC J. Kudrick AEC R. Tedesco AEC L. Slegers AEC G. Lainas AEC R.-Cudlin AEC H. P. Marsh Bechtel W. C. Barnhoir GE J. P. McGaughy, Jr. MP&L L. F. Dale MP&L N. H. Starnpley MP&L  ;

L. J. Sobon GE J. J. Tkacik Bechtel F. P. Schauer AEC l l

R. P. Barr GE D. A. Rockwell GE A. S. McCurdy MP&L j

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