ML20212H551
| ML20212H551 | |
| Person / Time | |
|---|---|
| Site: | Brunswick  |
| Issue date: | 01/16/1987 |
| From: | Sylvester E Office of Nuclear Reactor Regulation |
| To: | Utley E CAROLINA POWER & LIGHT CO. |
| Shared Package | |
| ML20211P084 | List: |
| References | |
| GL-83-08, GL-83-8, NUDOCS 8701210491 | |
| Download: ML20212H551 (3) | |
Text
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January, 16, 1987 w
Docket Nos. 50-325/324 DISTRIBUTION L ecketJUe!
D NRC PDR Mr. E. E. Uticy Local PDR Senior Executive Vice President RBernero s
Power Supply and Engineering & Construction OGC-Bethesda Carolina Power & Light' Company EJordan Post Office Box 1551 BGrimes Raleigh, North Carolina 27602 JPartlow NThompson
Dear Mr. Utley:
ESylvester SNorris
SUBJECT:
MARK I CONTAINMENT DRYWELL VACUUM BREAKERS ACRS (10)
PD#2 Plant File
'Re:
Brunswick Steam Electric Plant, Units 1 and 2 WLong By Generic Letter 83-08, " Modification of Vacuum Breakers on Mark I Containment," dated February 2,1983, we identified a potential failure mode of the wetwell/drywell vacuum breakers in chugging and condensation oscillation phase of blowdown to the torus during a loss of coolant accident.
In that Generic Letter we requested that all affected licensees provide a commitment to submit the result of plant unique calculations which either formed the bases for modification to vacuum breakers or provide justification for their as-built acceptability.
By a letter dated June 23, 1983, you provided a response to Generic Letter 83-08, comitting to modifications of vacuum breaker pallets, vacuum breaker hinge shafts, vacuum breaker arms, and vacuum breaker hinge arm studs.
On November 5,1985 we sent you a Request for Additional Information (RAI).
The purpose or' this RAI was to obtain verification that the pallet impact velocity used in-your vacuum breaker stress analysis was determined using the approved methodology consistent with the conditions and restrictions prescribed by the staff. Your reply dated December 13, 1985, as supplemented March 28, 1986 confirmed that you used the approved methodology.
The staff's technical. assistance contractor, Franklin Research Center (FRC)
- has reviewed the results of your stress analysis to verify that the vacuum breaker stresses calculated by using the pallet impact velocity as input to your analytical model of the valve are now within the ASME code allowable values for the materials.used.
Copies of our safety evaluation and the FRC Technical Evaluation are enclosed.
n 8701210491 870116 PDR ADOCK 05000324 p
PDR, t.
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l Based on our review, we conclude that the analyses performed to predict the drywell vacuum breaker impact velocities and resulting stresses were performed using acceptable methodology and that the modified vacuum breakers will not be subjected to excessive stress as a result of LOCA chugging and condensatica oscillation loads.
This completes our review of Multiplant Action Item D-20 for Brunswick Steam Electric. Plant, Units 1 and 2.
Sincerely, Orisimal signed by Ernest D. Sylvester, Project Manager BWR Project Directorate #2 Division of BWR Licensing
Enclosure:
As stated cc w/ enclosure:
See next page DB D#2 DBL:PD#2 2
SN ESylvester/cd r
1/l4/87 1/ldr/87 1//6 /87 0FFICIAL RECORD COPY k
O Mr. E. E. Utley Brunswick Steam Electric Plant Carolina Power & Light Company Units 1 and 2 cc:
Mr. P. W. Howe Mr. C. R. Dietz Vice President Plant General Manager Brunswick Nuclear Project Brunswick Nuclear Project Box 10429 Box 10429 Southpert, North Carolina 28461 Southport, horth Carolina 28461 Thomas A. Baxter, Esquire Mr. H. A. Cole Shaw, Pittman, Potts & Trowbridge Special Deputy Attorney General 2300 N Street, N. W.
State of North Carolina Washington, D. C.
20037 Post Offic'e Box 629 Raleigh, North Carolina 27602 Mr. D. E. Hollar Associate General Counsel Mr. Robert P. Gruber Carolina Power.& Light Company Executive Director Post Office Box 1551 Public Staff - tiCUC Raleigh, North Carolina 27602 Post Office Box 25620 Raleigh, North Carolina 27626-0620 Mr. Christopher Chappell, Chairman Board of Commissioners Post Office Box 249 Bolivia North Carolina 28422 Mrs. Chrys Baggett State Clearinghouse Budget and Management 116 West Jones Street Raleigh, North Carolina 27603 Resident Inspector U. S. Nuclear Regulatory Commission Star Route 1 Post Office Box 208 Southport, North Carolina 28461 l
Regional Administrator, Region II
(
U. S. Nuclear Regulatory Commission 101 Marietta Street, Suite 2900 Atlanta, Georgia 30303 Mr. Dayne H. Brown, Chief Radiation Protection Branch Division of Facility Services N. C. Department of Human Resources 701 Barbour Drive Raleigh, North Carolina 27603-2008 l
.