ML16341E089
| ML16341E089 | |
| Person / Time | |
|---|---|
| Site: | Diablo Canyon  |
| Issue date: | 02/26/1987 |
| From: | Schierling H Office of Nuclear Reactor Regulation |
| To: | Shiffer J PACIFIC GAS & ELECTRIC CO. |
| References | |
| NUDOCS 8703040212 | |
| Download: ML16341E089 (12) | |
Text
February 26, 1987 Docket Nos.
50-275 and 50-323 Mr. J.
D. Shiffer, Vice President Nuclear Power Generation c/o Nuclear Power Generation, Licensing Pacific Gas and Electric Company 77 Beale Street, Room 1451 San Francisco, California 94106 DISTRIBUITON
'NNN Local PDR PDP3 Rdg.
T. Novak E. Jordan B. Grimes J. Partlow N. Thompson C.
Yogan R. Ballard P. Narbut ACRS(10)
H. Schierling D. Jeng H. Ashar H. Fishman H. McGurren L. Olshan F. Rinaldi E. Rossi M. Mendonca L. Chandler
Dear Mr. Shiffer:
SUBJECT'EQUEST FOR INFORMATION ON RACK TO RACK INTERACTIONS I
In a meeting on February 18, 1987 you provided additional information on postulated rack to rack interactions in response to our letter of February ll, 1987.
At the conclusion of the meeting the staff requested that you further amplify your response with respect to use of friction factor and distance between rows of racks for the single rack and multi-rack model.
The staff also requested that you provide as soon as possible your written response to the four items in our February 11, 1987 letter.
As a result of further staff evaluation of the information provided at the meeting and of observations during the site visit on February 19 we find it necessary that additional information and clarification on your rack to rack analysis is required.
Therefore, we have incorporated the two questions from the February 18 meeting in the items as stated in the enclosure.
We request that you provide us with your response as soon as possible.
Sincerely,
Enclosure:
As stated Hans Schierling, Senior Project Manager Project Directorate 83 Division of PWR Licensing-A cc:
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Mr. J.
D. Shiffer Pac'ific Gas and Electric Company Diablo Canyon CC:
Philip A. Crane, )r., Esq.
Pacific Gas A Flectric Company Post Office Box 7442 San Francisco, Cali fornia 94120 Janice E. Kerr, Esq.
California Pub'lic Utilities Commission 350 McAllister Street San Francisco, California 94102 Ms. Sandra A. Silver 660 Granite Creek Road Santa Cruz, California 95065'r.
W. C. Gangloff Westinghouse Electric Corporation P.
O.
Box 355 Pittsburgh, Pennsylvania 15230 Manager Editor San Luis Obispo County Telegram Tribune 1321.lohnson Avenue 1726 M Street, N.W.
Suite 1100 Washington,.DC 20036-4502 Plr. Leland M. Gustafson, Manager Federal Relations Pacific Gas and Electric Company 1726 M Street, N.
W.
Washington:,
DC 20036-4502 Dian M. Grueneich, Esq.
Edwin F. Lowry, Esq.
Grueneich 5 Lowry 345 Franklin 'Street San Francisco, Cali fornia 94102 NRC Resident Inspector Diablo Canyon Nuclear Power Plant c/o U.S. Nuclear Regulatory Commission P. 0.
Box 369 Avila Beach, California 93424 Mr. Dick Blakenbura Editor 8 Co-Publisher South County Publishing Company P. 0.
Box 460 Arroyo Grande, California 93420 Bruce Norton, Esq.
c/o Philip A. Crane, Esq.
Pacific Gas and Electric Company Post Office Box 7442 San Francisco, California 94120 Or.
R.
B. Ferguson Siera Club - Santa Lucia Chapter Rocky Canyon Star Route Creston, California 93432 Chairman San Luis Obispo County Board of Supervisors Room 220 County Courthouse Annex San Luis Obispo, California 93401 Director Energy Facilities Siting Division Energy Resources Conservation and Development Commission 1516 9th Street Sacramento, California 95814 Ms. Jacquelyn Wheeler 2455 Leona Street San Luis Obispo, California 93400
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Pacific Gas 5 Electric Company Diablo Canyon CC:
Ms. Laurie McOermott, Coordinator Consumers Organized for Defense of Environmental Safety 731 Pacific Street, Suite 42 San Luis Obispo, California 93401 Mr. Joseph
- 0. Ward, Chief
'adiological Health Branch State Department of Health Services 714 P Street, Office Building 88 Sacramento, California 95814 Ms. Nancy Culver 192 Luneta Street San Luis Obispo, California 93401 President California Public Utilities Commission California State Building 350 McAllister Street San Francisco, California 94102 Regional Administrator, Region V
U.S. Nuclear Regulatory Commission 1450 Maria Lane Suite 210 Walnut Creek, California 94596
II 1
Pacific Gas and Electric Company Diablo Canyon CC:
Glenn 0. Bright Administrative Judge Atomic Safetv and Licensing Board U.S. Nuclear Regulatory Commission Washington, DC 20555 Dr. Jerry Harbour Administrative Judge Atomic Safety and Licensing Board U.S. Nuclear Regulatorv Commission Mashington, DC 20555 B. Paul Cotter, Jr.,
Chairman Administrative Judge Atomic Safety and Licensing Board U.S. Nuclear Regulatory Commission Washington, DC
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ENCLOSURE REQUEST FOR INFORMATION RACK TO RACK INTERACTIONS For the four requests for information below, use the following bounding parameters:
2.
3.
use a coefficient of friction of 0.2 and 0.8; use a spacing of 7.5 inches between adjacent rows of racks; simulate the rocking behavior of racks.
Any modeling variation made to the above parameters should be justified on the basis that the varied parameter or feature more realistically simulates the actual rack behavior.
(I)
Provide a comparison of the impact forces resulting from an analysis of the single rack and multi-rack models.
In the event that the results indicate that the multi-rack model impact force exceed the single rack impact force, demonstrate that the integrity of the rack during the postulated Hosgri earthquake is maintained.
(2)
In order to hetter understand the dynamic behavior of the simplified multi-rack model during the.postulated Hosgri earthquake, provide time-history data in tabular or graphical form.
The data should include, as a minimum, the translation of each rack as a function of time and the impact forces on the wall as a function of time.
(3)
Provide a discussion of the fluid coupling analysis as presented during the February 18, 1987 meeting, including the governing principles, controlling equations, and derivations.
Also, address the influence on the impact forces of the modelled racks when the adjacent rows of racks I) move in phase,
- 2) move out of phase, and 3) are fixed.
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(4)
For the simplified single and multi-rack models, compare the impact forces on the fuel assemblies.
In the event that the results indicate that the impact forces on the fuel assemblies using the multi-rack model exceed those of the single rack model, demonstrate the integrity of the fuel assemblies for the postulated Hosgri earthquake.
(5)
During the site visit by the staff and consultant on February 19, 1987, it was observed that the distance from the cell wall to the edge of the base plate was greater than the thickness of the respective girdle bar for a few of the rack modules.
Describe how such variations in the proiection distances from that modelled could affect the results of the analyses and the consequent stresses on the base plate welds and the fuel cell walls.