ML20247M817
| ML20247M817 | |
| Person / Time | |
|---|---|
| Issue date: | 05/16/1989 |
| From: | Long W Office of Nuclear Reactor Regulation |
| To: | Kintner E ALWR UTILITY STEERING COMMITTEE |
| References | |
| PROJECT-669A, RTR-REGGD-01.076, RTR-REGGD-01.117, RTR-REGGD-1.076, RTR-REGGD-1.117 NUDOCS 8906050151 | |
| Download: ML20247M817 (3) | |
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May 16, 1989 o
Project No. 669 Mr. E. E. Kintner, Chairman Advanced Light Water Reactor Steering Committee GPU Nuclear Corporation 100 Interpace Parkway Parsippany, New Jersey 07054
Dear Mr. Kintner:
SUBJECT:
ALWR REQUIREMENTS DOCUMENT - TORNADO DESIGN Your letter of March 30, 1989 indicates your intent to use the design basis tornado criteria identified in our letter dated March 25, 1988. Your letter further notes that the Optimization Paper (letter from C. F. Sears to H. R.
Denton dated March 24,1986) proposes the elimination of tornado missile barriers such as labyrinths on HVAC inlets and exhausts, and requests the staff's position.
The staff's position on tornado missile barriers is described in the Standard Review Plan, Sections 3.5.1.4, 3.5.2 and 3.5.3, and in Regulatory Guides 1.76 and 1.117. Specifically,. systems, structures and components to be protected from the effects of the design basis tornado include: (1) those necessary to ensure the integrity of the RCS boundary, (2) those necessary to ensure the capability to shutdown the reactor and maintain it in a safe shutdown (both hot and cold) condition, and (3) those whose failure could lead to calculated offsite exposures greater than 25% of the guideline exposures of 10 CFR Part 100 (See Appendix to Reg. Guide 1.117). Protective barriers may be omitted where the structures and components themselves are designed to withstand the missile strikes. Low probability events (i.e. DBAs) need not be postulated to occur coincident with the design basis tornado.
If you desire additional information or wish to pursue exceptions to the above positions, please contact me at (301) 492-1103.
Sincerely,
/s/
William O. Long, Senior Project Manager Stand rdization and Non-Power Reactor k k [ h k h k h>. Q ivision of Reactor Projects - III, IV, Project Directorate V and Special Projects Office of Nuclear Reactor Regulation
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Project No.-669 Mr. E. E. Kintner, Chairman Advan.ced Light Water Reactor Steering Committee GPU Nuclear Corporation-
.100 Interpace' Parkway Parsippany, New Jersey 07054
Dear Mr. Kintner:
SUBJECT:
ALWR REQUIREMENTS DOCUMENT - TORNADO DESIGN Your letter of March 30,1989 -indicates your intent to use the design basis tornado criteria identified in our letter dated March 25, 1988. Your letter further notes that the Optimization Paper (letter from C. F. Sears to H. R.
'Denton dated March 24,1986) proposes the elimination of tornado missile barriers such as labyrinths on HVAC inlets and exhausts, and requests the staff's position.
The staff's position on tornado missile barriers is described in the Standard Review Plan, Sections 3.5.1.4, 3.5.2 and 3.5.3, and in Regulatory Guides 1.76 and 1.117. Specifically, systems, structures and components to be protected from the effects of the design basis tornado include: (1) those necessary to
. ensure the integrity of the RCS boundary, (2) those necessary to ensure the capebility to shutdown the reactor and maintain it in a safe shutdown (both hot and cold) condition, and (3) thost whose failure could lead to calculated offsite exposures greater than 25% of the guideline exposures of 10 CFR Part 100 (See Appendix to Reg. Gu.ide 1.117). Protective barriers may be omitted where-the structures and components themselves are designed to withstand the missile strikes. Low probability events (i.e. DBAs) need not be postulated to occur coincident with the design basis tornado.
If you desire additional information or wish to pursue exceptions to the above positions, please contact me at (301) 492-1103.
Sincerely, j.
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William 0. Long, Senior ProJ ct Manager Standardization and Non-Power Reactor Project Directorate Division of Reactor Projects - III, IV, V and Special Projects Office of Nuclear Peactor Regulation cc: See next page
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- Mr.'Edwin E. Kintner, Chairman
- Project No. 669.
- ALWR Steering Committee-EPRI cc: Mr. John DeVine, Jr.
. Nuclear Power Division-Electric Power.Research Institute P. 0.- Box - 10412
'Palo Alto, CA'.
94303 se
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