ML20238A870

Safety Evaluation Supporting Amend 10 to License DPR-21

ML20238A870
Person / Time
Site:	Millstone
Issue date:	09/01/1987
From:	Office of Nuclear Reactor Regulation
To:
Shared Package
ML20238A843	List: ML20238A840 ML20238A854 ML20238A870
References
NUDOCS 8709090456
Download: ML20238A870 (2)

Text

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[ o,, UNITED STATES 8 m NUCLEAR REGULATORY COMMISSION

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7,i j WASHINGTON, D. C. 20555

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SAFETY EVALUATION BY THE OFFICE OF NUCLEAR REACTOR REGULATION SUPPORTING AMENDMENT N0. 30 TO FACILITY OPERATING LICENSE N0. DPR-21 NORTHEAST NUCLEAR ENERGY LOMPANY MILLSTONE NUCLEAR POWER STATION, UNIT NO. 1 DOCKET N0. 50-245

1.0 INTRODUCTION

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By letter dated January 21, 1987, the Northeast Nuclear Energy Company (NNECO or by the licensee) submitted an application to amend Facility Operating License No. DPR 21 for Millstone Nuclear Power Station, Unit No. 1 (MNPSI). The proposed amendment would delete the technical specification (TS) limiting conditions for operation (LCO) and surveillance requirements (SR) for the switchyard batteries. -

2.0 EVALUATION The licensee states that deletion of the TS requirements for switchyard batteries will permit NNECO to shift maintenance responsibility for these batteries from the Millstone Unit 1 Maintenance Department (MU1MD) to the New London Substation Maintenance Department (NLSMD). The batteries are one of the many components that make up the switchyard requiring surveillance, calibration, and preventive maintenance. The i switchyard breakers, disconnect switches, cables, protective relays, and other components, not covered in the TS, are maintained by NLSMD.

However, the switchyard batteries are currently maintained, per TS requirements, by MU1MD. The proposed changes will provide consistent maintenance and surveillance of the Millstone 1 preferred off-site power supply. In addition, the switchyard batteries serve no safety-related function and, thus, require no special controls to assure adequate safety.

This is also demonstrated by the absence of surveillance requirements for switchyard batteries in the Standard TS (STS) for BWRs. The proposed changes will establish consistency between the Millstone Unit No.1 TS and the STS.

The Millstone switchyard consists of twelve 345kv breakers, four 345kv transmission lines, three 345kv tie lines to the generator step-up transformers, and three 345kv tie lines to the reserve station service transformers. The breakers and motor-operated disconnect switches are 8709090456 870901 S DR ADDCK 0500

controlled from the Connecticut Valley Exchange and from the Millstone Unit No. I control room (CR), with the CR having primary control of the generator ~ breakers. The 125v de power for operating switchyard equip-ment is supplied by two independent batteries, the maintenance and surveillance of which is proposed to be deleted from TS requirements.

Preventive maintenance would still be performed on the switchyard batteries. Staff review found the preventive maintenance program being performed by NLSMD on other batteries comparable with the site program.

The ori-site electrical system consists of all normal and emergency elec- ,

trical equipment necessary for nuclear safety and safe plant operation.

The 125v de power to operate the on-site breakers and other on-site equipment is from two separate subsystems (unrelated to the switchyard batteries) that serve normal non-safety-related and Class IE safety-related plent de electrical loads. The LCO and SR for these batteries remain in the TS.

The staff finds that the requested deletion of LC0 and SR requirements for the switchyard batteries from the TS would not result in a decrease in plant safety, because the reliability of onsite emergency power is unchanged and because the switchyard batteries do not serve a safety related function.

Based on the above, we find the proposed deletion of TS limiting conditions for operation and surveillance requirements for the switchyard batteries acceptable.

3.0 ENVIRONMENTAL CONSIDERATION

This amendment involves only changes in administrative procedures and requirements. The staff has 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 or cumulative occupational radiation j exposure. The Commission has previously issued a proposed finding that {

this amendment involves no significant hazards consideration and there 1 has been no public comment on such finding. Accordingly, this amendment l meets the eligibility criteria for categorical exclusion set forth in 10CFR51.22(c)(9). Pursuant to 10 CFR 51.22(b) no environmental impact j statement or environmental assessment need be prepared in connection with the issuance of this amendment. l

4.0 CONCLUSION

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

(1) there is reasonable assurance that the health and safety of the will not be endangered by operation in the proposed manner, such and (2) public activities will be conducted in compliance with the Commission 4 regulations and the issuance of this amendment will not be inimical to the common '

defense and security or to the hec th and safety of the public.

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Principal Contributor

E. Conner 1

I Dated: September 1,1987 l

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