ML20203E905

Safety Evaluation Supporting Amend 92 to License NPF-3

ML20203E905
Person / Time
Site:	Davis Besse
Issue date:	03/19/1986
From:	Office of Nuclear Reactor Regulation
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ML20203E890	List: ML20203E885 ML20203E905
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NUDOCS 8604240489
Download: ML20203E905 (2)

Text

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6 UNITED STATES 8

NUCLEAR REGULATORY COMMISSION WASHINGTON, D. C. 20555

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SAFETY EVALUATION BY THE OFFICE OF NUCLEAR PEACTOR REGULATION SUPPORTING AMENDMENT N0. 92 TO FACILITY OPERATING LICENSE NO. NPF-3 TOLED0 EDIS0N COMPANY AND THE CLEVEL,.ND ELECTRIC ILLUMINATING COMPANY DAVIS-BESSE NUCLEAR POWER STATION, UNIT NO. 1 DOCKET NO. 50-346

1.0 INTRODUCTION

By letter dated July 13, 1983, Toledo Edison Company (the licensee) requested changes to existing Technical Specification (TS) requirements and the associated basis for Decay Heat Removal (DHR).

The proposed changes affect TS paces 3/4 4-2 and B 3/4 4-1.

2.0 EVALUATION Description of Change A footnote is being added to TS 3/4.4, 3.4.1.2, " Reactor Coolant System Shutdown and Hot Standby," referencing the operability of Decay Heat Removal Loops I and 2 for Modes 3, 4 and 5 and stating, "This loop may not be selected in Mode 3 unless the primary side temperature and pressure are within the decay heat removal system's design conditions."

Bases Section 3/4.4.1 is revised to include the DHR System design pressure and temperature limit values of 330 psig and 350'F, respectively.

Existing TS 3.4.1.2 requires that at least two of the following coolant loops be operable in Modes 3, 4 and 5:

a.

Reactor Coolant Loop 1 and its associated steam generator b.

Reactor Coolant Loop 2 and its associated steam generator c.

Decay Heat Removal Loop 1 d.

Decay Heat Removal Loop 2 Table 1.1 of the TSs defines Mode 3 as K less than 0.99 and average coolanttemperaturegreaterthanorequaNo280F. TS 3.4.9.1, Figure 3.4-3, specifies Reactor Coolant System temperature and pressure limits during cooldown. Above 280'F the maximum allowable pressure increases linearly from 1550 psig to a maximum of 2275 psig at 367 F.

The TSs contain no other restrictions on plant pressure in Mode 3.

Thus, 1

addition of the footnote restricting DHR System operability in Mode 3 is necessary to prevent system overpressurization, l

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, In Modes 4 and 5, maximum allowable Reactor Coolant System pressures per TS 3.4.9.1 aru 1550 psig and 549 psig, respectively; hewever TS 3.4.2 requires that the DHR System relief valve be operable with a lift setpoint of less than or equal to 330 psig. Thus overpressure protection is provided in Modes 4 and 5 such that the proposed footnote need not be applicable to those modes.

The proposed revision to the basis clearly specifies the DHR System design conditions and is consistent with the proposed revision to TS 3.4.1.2.

We find the proposed revisions acceptable.

3.0 ENVIRONMENTAL CONSIDERATION

This amendment involves changes in the installation er use of a facility component located within the restricted area as defined in 10 CFR Part 20.

We have determined that the amendment involves 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 cr cumulative occupational radiation exposure. The Commission has previously issued a proposed finding that this amendment involves no significant hazards consideration and there has been no public comment on such finding. 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.

4.0 CONCLUSION

We have 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 r.egulations and the issuance of this amendment will not be inimical to the common defense and security or to the health and safety of the public.

Dated: March 19,~ 1986 Principal Contributor: W. G. Guldemond

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