ML18030B035

Requests Addl Info within 45 Days to Complete Review of 841105 Response to 830202 Generic Ltr 83-08, Mods of Vacuum Breakers on Mark I Containments, Including Info Re Vacuum Breaker Valve Opening & Closing Impact Velocities

ML18030B035
Person / Time
Site:	Browns Ferry
Issue date:	01/17/1986
From:	Clark R Office of Nuclear Reactor Regulation
To:	Parris H TENNESSEE VALLEY AUTHORITY
References
GL-83-08, GL-83-8, TAC-57144, TAC-57145, TAC-57146, NUDOCS 8601290186
Download: ML18030B035 (4)

Text

January 17, 1986 Docket Nos.

50-259/260/296 Re:

Browns Ferry Nuclear Plant, Units 1, 2 and 3

Mr. Hugh G. Parris Manager of Power Tennessee Valley Authority 500A Chestnut Street, Tower II Chattanooga, Tennessee 37401

SUBJECT:

MODIFICATION OF VACUUM BREAKERS ON HARK I CONTAINMENTS (GENERIC LETTER 83-08)

DISTRIBUTION NRC PDR

Local, PDR PD¹2 Reading RBernero

'ELD EJordan BGrimes JPartlow RClark MGrotenhuis SNorris ACRS (10)

Gray File M~rug By letter dated November 5, 1984, you responded to Generic Letter 83-08 dated February 2, 1983.

We are continuing the review and find that we need the information requested in the enclosure to this letter in order to complete our review regarding the vacuum breakers.

Please respond to this request within 45 days from receipt of this letter.

This request for information was approved by the Office of Management and Budget under clearance No. 3150-0011.

Comments on burden and duplication may be directed to the Office of Management and Budget, Reports Management, Room 3208, New Executive Office Building, Washington, D.C.

20503.

Sincerely, Orlgfnal stgned bg Richard J. Clark Richard J. Clark, Project Manager BWR Project Directorate ¹2 Division of BWR Licensing

Enclosure:

As stated cc w/enclosure:

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Mr. Hugh G. Parris Tennessee Valley Authority Browns Ferry Nuclear Plant Units 1, 2, and 3

cco H. S. Sanger, Jr., Esquire General Counsel Tennessee Valley Authority 400 Conmerce Avenue E

118 330 Knoxville, Tennessee 37902 Mr. Ron Rogers Tennessee Valley Authority 400 Chestnut Street, Tower II Chattanooga, Tennessee 37401 Mr. Charles R. Christopher

Chairman, Limestone County Commission Post Office Box 188

Athens, Alabama 35611 Ira L. Meyers, M.D.

State Health Officer State Department of Public Health State Office Building Montgomery, Alabama 36130 Mr. K. W. Whitt E3A8 400 West Sumnit Hill Drive Tennessee Valley Authority Knoxville, Tennessee 37902 Regional Administrator, Region II U. S. Nuclear Regulatory Commission 101 Marietta Street, Suite 3100 Atlanta, Georgia 30303 Mr. Steven Roessler U.

S. Nuclear Regulatory Commission Reactor Training Center Osborne Office Center, Suite 200 Chattanooga, Tennessee 37411 Games A. Coffey Site Director, BFNP Tennessee Valley Authority Post Office Box 2000

Decatur, Alabama 35602 Resident Inspector U. S. Nuclear Regulatory Commission Route 2, Box 311

Athens, Alabama 35611 Mr. Donald L. Williams, Jr.

Tennessee Valley Authority 400 W st Summit Hill Drive, W10885 Knoxville, Tennessee 37902 Robert L. Lewis, Manager, BFNP Tennessee Valley Authority Post Office Box 2000

Decatur, Alabama 35602'

Request for Additional Information Related to the Modification of Vacuum Breakers on Mark I Containment Browns Ferry Nuclear Plant, Units 1, 2 and 3

The results of,the staff review of the Browns Ferry Nuclear Plant, torus-to-drywell vacuum breaker modification identified several areas where further information is needed before the staff can complete its review.

These areas summarized below were delineated in the staff's generic evaluation of the methodology proposed to predict vacuum breaker valves opening and closing impact velocities, letter from D. Vassallo to H.

Pfefferlen, dated December 24, 1984 (copy attached).

1.

Is the chugging source rate used in the evaluation the same as the one developed in CDI Report (883-3)'? If not the

same, provide the chugging source rate with the supporting justification.

2.

Did the calculation apply the 1.07 load factor to account for the uncertainty in calculating the underpressure (Section IY of the staff's generic evaluation).

3.

Have the calculations used the drywell model which results in the most conservative prediction (Section V of the generic evaluation)?