ML20136G891

Safety Evaluation Supporting Amend 30 to License R-28

ML20136G891
Person / Time
Site:	University of Michigan
Issue date:	11/05/1985
From:	Office of Nuclear Reactor Regulation
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ML20136G876	List: ML20136G872 ML20136G883 ML20136G891
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NUDOCS 8511220493
Download: ML20136G891 (3)

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[pa aeg'og UNITED STATES

[ g NUCLEAR REGULATORY COMMISSION

$ j WASHINGTON, D. C. 20555

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SAFETY EVALUATION BY THE OFFICE OF NUCLEAR REACTOR REGULATION SUPPORTING AMENDMENT N0. 30 TO FACILITY LICENSE NO. R-28 UNIVERSITY OF MICHIGAN DOCKET N0.59-002 Introduction

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15N "The University of Michigan (UM) reactor operating license No. R-28 recently '

'was renewed for a period of twenty years. This amendment, requested by the licensee, adjusts the shutdown margin during reactor fuel loading changes (Section 3.1(5)) to be compatible with the staff's Safety Evaluation Report for the license renewal and with the values in Section 3.1(1), which is the cold clean shutdown margin with all shim safety rods fully inserted and the regulating rod fully withdrawn.

j Evaluation  ;

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' .. The minimum shutdown margin relative to a cold, clean, xenon-free condition for this core is 0.025 delta k/k as set forth in specification 3.1(1) rather e than 0.030 as set forth in specification 3.1(5). This discrepancy should

.f have been noted and corrected during the license renewal review. This change makes section 3.1(5) compatible with the remainder of Section 3.0.

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f Environmental Consideration This amendment involves changes in the installation or use of facility components located within the restricted area as defined in 10 CFR Part 20 and changes in inspection or surveillance requirements. The staff has determined that the amendment involves no significant hazards consideration (as discussed below), there is no significant change in the types or signifi-cant increase in the amounts of any effluents that may be released offsite, and there is no significant increase in individual or cumulative occupational radiation exposure. Accordingly, this amendment meets 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 or environmental assessment need be prepared in connection with the issuance of this amendment.

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Conclusion The staff has concluded, based on the considerations discussed above, that:

(1) because the amendment does not involve a significant increase in the probability or consequences of accidents previously evaluated, does not create the possibility of a new or different kind of accident from any accident previously evaluated, and does not involve a significant reduction in a safety margin, the amendment does not involve a significant hazards consideration; (2) there is reasonable assurance that the health and safety of the public will not be endangered by the activities authorized by the proposed amendment; and (3) such activities will be conducted in compliance with the Commission's

. regulations and the issuance of this amendment will not be inimical to the common defense and security or the the health and safety of the public.

Principal Contributor: Harold Bernard Dated: November 5, 1985

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TECHNICAL SPECIFICATIONS Ford Nuclear Reactor

' Docket 50-2, License R-28 i November, 1984' 3.O LIMITING CONDITIONS FOR OPERATION 3.1 Reactivity Limits -

Applicability '.

This specification applies to the reactivity of the reactor core and to the reactivity worths of control rods and experiments.

When the reactor is operated with the heavy water reflector tank in place, the limits will not include the static reactivity worth of P.he tank. _

'- , Objective:

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[ To assure that the reactor can be controlled and shutdown

! ;7 ,_ at all times and that the safety. limits will not be exceeded. <

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, Specification, l

l (1) The shutdown margin relative to the cold, xenon free critical condition shall be at least .025 delta K/K with all three shim cafety rods fully inserted and the regulating rod fully withdrawn and 0.0045 delta K/K with the most reactive shim saf ety rod and the regulating rod i fully withdrawn.

. . (2) The overall core excess reactivity including i moveable experiments shall not exceed 0.038 delta K/K.

f (3) The total reactivity worth of all experiments shall not exceed 0.012 delta K/K. ,

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(4) The reactivity worth of each experiment shall be limited as follows:

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. Nanimum Ex neri ment Reactivity Worth Moveable 0.0012 delta K/K Secured 0.012 delta K/K (5) The reactor shall be suberf.tical by at least Q,Q21 delta K/K during fuel loading changes. ,

(6) Shim saf ety rods shall not be removed from the core f or inspection if the shutdown margin is less than 0.01 delta K/K with the most reactive evnaining shty saf ety rod fully withdrawn.

(7) The reactivity worth of the regulating rod shall not exceed 0.006 delta K/K.

Amendment No. 30 . page 9 m .