NRC Generic Letter 81-08, Odyn Code

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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