BWR Scram Discharge System (Generic Letter 80-107)
NUCLEAR REGULATORY COMMISSION
WASHINGTON, D.C. 20555
DEC 9 1980
TO ALL BWR LICENSEES
SUBJECT: BWR SCRAM DISCHARGE SYSTEM
Reference: (a) IE Bulletin 80-17 with Supplements 1, 2, and 3
This letter transmits the staff's Generic Safety Evaluation Report (SER)
regarding BWR Scram Discharge System dated December 1, 1980 for your
information. The SER recommends certain short-term actions in excess of
those in Reference (a) which are considered necessary to assure the
continued safe operation of General Electric (GE) BWR's with inadequate
SDV-IV hydraulic coupling until permanent design changes are made.
We are currently discussing schedular impacts with the BWR Owners Group
relative to the implementation of these short-term requirements. After a
schedule for implementation for the short-term actions is resolved, we will
issue appropriate correspondence to assure the short-term requirements are
In addition, the criteria for permanent design changes affecting all
operating GE BWR's is included in the SER. With the exception of the
staff's position on Diverse Instrumentation, these criteria represent the
BWR Owners Group's positions. We note that in response to our letter of
October 1, 1980, all but one licensee* has agreed to adopt the BWR Owners
Group criteria for establishing permanent modifications to their systems.
These criteria are presently being evaluated by our Division of Safety
Technology and will be the subject of future correspondence.
Darrell G. Eisenhut, Director
Division of Licensing
*TVA has proposed modifications independent of the Owner's Group.
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