ML16288A472

Proposed Resolution of Generic Issue 135, Steam Generator and Steam Line Overfill Issues

ML16288A472
Person / Time
Issue date:	10/11/1989
From:	Remick F Advisory Committee on Reactor Safeguards
To:	Taylor J NRC/EDO
References
D891011
Download: ML16288A472 (10)

Text

D891011 Mr. James M. Taylor, Acting Executive Director for Operations U.S. Nuclear Regulatory Commission Washington, D.C. 20555

SUBJECT:

PROPOSED RESOLUTION OF GENERIC ISSUE 135, STEAM GENERATOR AND STEAM LINE OVERFILL ISSUES During the 354th meeting of the Advisory Committee on Reactor Safe-guards, October 5-6, 1989, we met with representatives of the NRC staff and discussed proposed actions for resolving Generic Issue 135. We also had the benefit of the document referenced.

As currently defined by the staff, this issue involves steam generator overfill events resulting from steam generator tube ruptures. The staff review has dealt almost exclusively with Westinghouse plants. We believe that the staff's proposed resolution is incomplete because it has not addressed the following matters:

(a) The behavior of Combustion Engineering and Babcock & Wilcox plants during steam generator overfill events, and (b) For overfill events, water may enter the auxiliary feedwater turbine steam supply line. If the steam supply valve to the turbine is opened, the resulting water slug could cause a rupture of the pressure boundary and the release of steam into the aux-iliary building.

Sincerely, Forrest J. Remick Chairman

Reference:

Memorandum dated August 14, 1989 from R. Wayne Houston, Office of Nuclear Regulatory Research, for R. F. Fraley, ACRS,

Subject:

Reso-lution of Generic Issue 135, "Steam Generator and Steam Line Overfill Issues," w/enclosures.

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