ML20235U964
| ML20235U964 | |
| Person / Time | |
|---|---|
| Site: | Sequoyah  |
| Issue date: | 03/02/1989 |
| From: | Office of Nuclear Reactor Regulation |
| To: | |
| Shared Package | |
| ML20235U952 | List: |
| References | |
| NUDOCS 8903090448 | |
| Download: ML20235U964 (2) | |
Text
-
octog n
k UNITED STATES 3
g NUCLEAR REGULATORY COMMISSION
\\.....}j t
WASHINGTON, D. C. 20555 7,,
ENCLOSUREJ SAFETY EVALUATION BY THE OFFICE OF NUCLEAR REACTOR REGULATION SUPPORTINr AMENDMENT NO.102 TO FACILITY OPERATING LICENSE NO. DPR-77 m
AND AMENDMENT NO. 91 TO FACILITY OPERATING LICENSE NO. DPR-79 TENNESSEE VALLEY AUTHORITY SE000YAH NUCLEAR PLANT, UNITS 1 AND 2 DOCKET NOS. 50-327 AND 50-328
1.0 INTRODUCTION
By the letter dated December 2, 1988, the Tennessee Valley Authority (TVA) requested a change to the Sequoyah, Units I and 2 Technical Specifications (TS). involving the method used to calculate the leakage rates during a containment integrated leak rate test (Type A Test).
The changes are to revise surveillance requirement (SR) 4.6.1.2 and Bases 3/4.6.1.2 in the TS to permit the use of the mass point method for calculating containment leakage rates for the Appendix J. Type A test. The request for an exemption to Appendix J of 10 CFR Part 50 in this application was withdrawn in TVA's letter dated December 21, 1988.
The proposed Bases 3/4.6.1.2 was revised to delete the reference to "an exemption to 10 CFR 50 Appendix J has been granted" because the request for the exemption was withdrawn.
2.0 EVALUATION Originally, when the NRC issued the Containment Integrated Leakage Test Requirements in Appendix J to 10 CFR Part 50, the staff required licensees to use the state-of-the-art leakage test methodology as described in ANSI Standard N 45.4-1972 for the Type A Test.
ANSI N 45.4-1972 accepted two techniques for calculating Type A test leakage rates; namely, the total-time method and the point-to-point method. Advances in technology have resulted in a third leakage rate calculation method called the mass point method. This method is specified in ANSI /ANS 56.8-1987. The NRC amended 10 CFR Part 50, Appendix J on November 15, 1988 to permit the use of the mass point method of calculating the Type A leakage rates if the test duration is at least 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />.
With the proposed TS change 88-32 TVA intends to use the mass point method for calculating the Type A test leakage rates in lieu of the two methods described in ANSI N 45.4-1972.
TVA stated that it intends to use the mass point method within the 24-hour test duration as required by Appendix J to 10 CFR Part 50.
Since TVA's TS change to use the mass point method to calculate Type A Test Leakage Rates conforms to the regulations in 10 CFR Part 50, Appendix J, the staff concludes that TS change 88-32 is acceptable.
8903090448 090302 +
PDR ADOCK 050003273 p
PNU;
i I
3.0 ENVIRONMENTAL CONSIDERATION
These amendments involve a change to a requirement with respect to the installation or use of a facility ccmpanent located within the restricted area as defined in 10 CFR Part 20 and changes to the surveillance requirements. The staff has determined that the amendments involve no significant increase in the amounts, and no significant change in the types, of any effluents that may be released offsite, and that there is no significant increase in individual or cumulative occupational radiation exposure. The Commission has previously issued a proposed finding that these amendments involve no significant hazards consideration and there has been no public comment on such finding.
Accordingly, the amendments meet the eligibility criteria for categorical exclusion set forth in 10 CFR 51.22(c)(9).
Pursuant to 10 CFR 51.22(b), no environmental impact statement nor environmental assessment need be prepared in connection with the issuance of these amendments.
4.0 CONCLUSION
The Commission made a proposed determination that the umrDdment involves no significant hazards consideration which was published in the Federal Register (53 FR 53099) on December 30, 1988 and consulted with the State of Tennessee.
No public comments were received and the State of Tennessee did not have any comments.
The staff has concluded, based on the considerations discussed above, that:
(1) there is reasonable assurance that the health and safety of the public will not be endangered by operation in the proposed manner, and (2) such activities will be conducted in compliance with the Commission's regulations, I
and the issuance of the amendments will not be inimical to the common defense and security nor to the health and safety of the public.
Principal Contributor:
P. Hearn Dated: March 2, 1989
,