ML16301A318

ACRS Comments on the Revised Asb 3-1 of Standard Review Plan 3.6.1, Requirements for Arbitrarily Postulated Jet Impingement Effects in the Break Exclusion Zone

ML16301A318
Person / Time
Issue date:	12/08/1987
From:	Kerr W Advisory Committee on Reactor Safeguards
To:	Stello V NRC/EDO
References
D871208
Download: ML16301A318 (1)

Text

D871208 Mr. Victor Stello, Jr.

Executive Director for Operations U.S. Nuclear Regulatory Commission Washington, D.C. 20555

SUBJECT:

ACRS COMMENTS ON THE REVISED ASB 3-1 OF STANDARD REVIEW PLAN 3.6.1, REQUIREMENTS FOR ARBITRARILY POSTULATED JET IMPINGEMENT EFFECTS IN THE BREAK EXCLUSION ZONE In the referenced memorandum, Eric S. Beckjord, Director, Office of Nuclear Regulatory Research, has requested approval of a Federal Regis-ter notice that would eliminate from the design basis the jet impinge-ment effects associated with the arbitrary one-square-foot break in the break exclusion (superpipe) zone of main steam and feedwater lines outside the containment.

Based on the draft Federal Register notice and discussions with the staff, we understand that the arbitrary one-square-foot break will be retained for environmental qualification of essential equipment and for structural pressurizations. Moreover, we understand that the staff will continue to enforce separation and isolation of essential equipment as the preferred method of providing protection, without referring to postulated jet impingement effects.

Under these conditions, we endorse publication of the draft Federal Register notice revising ASB 3-1 of Standard Review Plan 3.6.1.

Sincerely, William Kerr Chairman

Reference:

Memorandum dated October 2, 1987 for Edward L. Jordan, Chairman, CRGR and William Kerr, Chairman, ACRS, from Eric S. Beckjord, Director, RES,

Subject:

Request for Approval to Publish a Federal Register Notice Revising ASB 3-1 of SRP 3.6.1.