Protecting People and the EnvironmentUNITED STATES NUCLEAR REGULATORY COMMISSION
UNITED STATES
NUCLEAR REGULATORY COMMISSION
WASHINGTON, D.C. 20555
January 29, 1981
ALL HOLDERS OF CONSTRUCTION PERMITS AND OPERATING LICENSES FOR BOILING WATER
REACTORS
SUBJECT: ODYN CODE (GENERIC LETTER 81-08)
By letter dated November 4, 1980, we informed you of our requirments for use
of the ODYN code to calculate pressurization transients, and stated that a
safety evaluation describing the basis for our acceptance of this code would
be mailed to you in the near future.
ENclosed you will find a safety evaluation and a supplemental safety
evaluation which jointly evaluate the ODYN code and provide information
required for application of ODYN.
As you were informed in our letter of November 4, 1980, transient analyses
performed by General Electric supporting reload submittals recieved after
February 1, 1981, must contain appropriate ODYN analyses in place of those
previously performed with REDY for the limiting transients. After January
1982, all operating BWRs with General Electric analyses must have the
limiting transients recalculated with the ODYN code, even if no reload
submittal has been received. Also, this requirement for the calculation of
the limiting transients with the ODYN code is applicable to applicants for
an operating license and is a prerequisite to obtaining an operating
license.
Sincerely,
Darrell G. Eisenhut, Director
Division of Licensing
Enclosures:
1) Safety Evaluation
2) Supplemental Safety Evaluation