Safety Concerns Associated with Pipe Breaks in the BWR Scram System (Generic Letter No. 81-30) (Previously Issued July 7, 1981 as Generic Letter 81-26 Is Now Identified as 81-30)
UNITED STATES
NUCLEAR REGULATORY COMMISSION
WASHINGTON, D.C. 20555
July 31, 1981
TO ALL BWR LICENSEES
Gentlemen:
SUBJECT: SAFETY CONCERNS ASSOCIATED WITH PIPE BREAKS IN THE BWR SCRAM
SYSTEM (GENERIC LETTER NO. 81-30)
(PREVIOUSLY ISSUED JULY 7, 1981 AS GENERIC LETTER 81-26 IS NOW
IDENTIFIED AS 81-30)
Our letter of April 10, 1981 forwarded draft NUREG-0785 (same subject) and
requested a generic reply within 45 days of receipt. General Electric
Company submitted a generic response on behalf of the BWR licensees by
letter dated April 30, 1981.
The staff has completed its review of the generic evaluation prepared by GE.
NUREG-0803 "GENERIC SAFETY EVALUATION REPORT REGARDING INTEGRITY OF BWR
SCRAM SYSTEM PIPING" dated June 1981 is in the final editing phase and is
now planned for publishing in late July 1981. This report will provide
guidance to individual licensees in answering the plant specific request
contained in our April 10, 1981 letter.
Since the original time allowed for plant specific responses will expire on
or about the time you receive the staff's guidance, we are hereby extending
the time allowed to submit the plant specific information requested in our
April 10, 1981 letter. This extension of time is warranted based on our
finding that the analyzed sequence of events is not a dominant contributor
to core melt. However, the assumptions made in the risk assessment
supporting this conclusion must be confirmed with plant specific
information. Therefore, plant specific responses conforming to the guidance
contained in NUREG-0803 should be provided within 120 days of your receipt
of the NUREG guidance.
Sincerely,
Darrell G. Eisenhut, Director
Division of Licensing
Office of Nuclear Reactor Regulation
cc: Service List
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