ML20198E418

Safety Evaluation Supporting Amend 137 to License DPR-70

ML20198E418
Person / Time
Site:	Salem
Issue date:	11/20/1992
From:	Office of Nuclear Reactor Regulation
To:
Shared Package
ML20198E415	List: ML20198E418
References
NUDOCS 9212070109
Download: ML20198E418 (3)

Text

. - _

((p2 R,0 0

UNITED STATES g

NUCLEAR REGULATORY COMMISSION g

-l WASHINGTON, D. C. 20555

's,..... p SAFETY EVALUATION BY THE OFFICE OF NUCLEAR REACTOR REGULATION RELATED TO AMENDMENT NO.137TO FACILITY OPERATING LICENSE NO. OPR-70 PUBLIC SERVICE ELECTRIC & GAS COMPANY PHILADELPHIA ELECTRIC COMPANY DELMARVA POWER AND LIGHT COMPANY ATLANTIC CITY ELECTRIC COMPANY SALEM NUCLEAR GENERATING STATION. UNIT NO. 1 DOCKET NO. 50-272

1.0 INTRODUCTION

By letter dated August 14, 1992, the Public Service Electric & Gas Company, Philadelphia Electric Company, Delmarva Power and Light Company and Atlantic City Electric Company (the licensees) submitted a request for changes to the Salem Nuclear Generating Station, Unit No.1, Technical Specifications (TS).

The requested changes would revise TS 3.8.2.1, "A.C. Distribution - Operating" by:

adding a separate Action Statement for an inoperable inverter that would a.

require the inoperable inverter to be restored to operable within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />, or the unit would be shutdown, provided the associated bus is energized, and b.

revising the existing Action Statement to be consistent with the Limiting Condition for Operation (LCO), as follows:

" L.

With less than the above complement of A.C. busses OPERABLE or eneraized, restore the inoperable bus to OPERABLE and eneraized status within 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> or be in at least HOT STANDBY within the next 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> and in COLD SHUTDOWN within the.following_

30 hours3.472222e-4 days <br />0.00833 hours <br />4.960317e-5 weeks <br />1.1415e-5 months <br />."

(The underlined sections would be added.)

Also, TS 3.8.2.2, "A.C. Distribution - Shutdown" would be revised by adding

" energized from its respective inverter connected to its respective D.C. bus train" to the LCO for the 115 volt Instrument Bus.

2.0 EVALUATION The proposed change would make the Unit 1 LCO's and Action Statements for the Unit 1 inverters identical to those for Unit 2.

9212070109 921120

~

PDR ADOCK 05000272.

P PDR

. _ _ ~

. The existing Action Statement of TS 3.8.2.1, "A.C. DISTRIBUTION - OPERATING" would be lettered "a" with the clarification added that the bus must be "0PERABLE and energized" within 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> or the unit would be shut down. This l

change clarifies the Action Statement to be consistent with the LCO which i

requires the busses to be operable and energized.

A new Action Statement (b)for inverters to be inoperable, as follows:

would be added to TS 3.8.2.1 that would define an allowed outage time (A0T)

J.

With the inverter inoperable and the-bus energized, 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> would be allowed to restore the inverter to OPERABLE status. However, if the associated bus was deenergized, the bus would have to be reenergized within 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> and the inverter returned to OPERABLE status within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> total.

If the bus could not be reenergized within 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> or the i

inverter returned to OPERABLE status within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />, the plant would be brought to HOT STANDBY within the next 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> and to COLD SHUTDOWN within the following 30 hours3.472222e-4 days <br />0.00833 hours <br />4.960317e-5 weeks <br />1.1415e-5 months <br />.

4 The vital instrument bus can be energized through a constant voltage transformer in the event the inverter is not available. Allowing 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> to restore the inverter to OPERABLE status does not incur an unnacceptable risk of losing the vital instrument bus fellowing a loss of offsite power. Also, the addition of a 24-hour allowed outage time for the inverters is consistent with revision 4 of the Westinghouse Standard TS and the current Salem Unit 2 TS. The A0T for the complete loss of a bus is not changed.

The Limiting condition for Operation (LCO) for the 115 volt Instrument Bus in TS 3.8.2.2, "A.C. DISTRIBUTION - SHUTDOWN" would be revised as follows:

"1 -

115 volt Instrument Bus eneraized from its resoective inverter connected to 4

l its resoective D.C. bus train".

(The underlined section would be added.)

This change clarifies the source of power for the 115 volt instrument bus and i

is consistent with the current Salem Unit 2 TS.

The staff finds the proposed changes to be acceptable.

3.0 STATE CONSULTATION

In accordance with the Commission regulations,- the New Jersey State official was notified on October 8,1992, of the proposed issuance of the amendment.

The State official had no comments on the proposed no significant hazards determination However, by letter dated October 19, 1992, the State of New Jersey forwarded a technical comment on the proposed change that stated "The. proposed change adds an action statement-to Technical Specification 3.8.2.2 for inoperable inverters.

However, no surveillance requirement'related to inverters exists and none is proposed to be added.

The proposed change requires certain I

actions if inverters are inoperable. A surveillance requirement is needed so that the frequency and method of verifying inverter operabili+v is specified.

l Note that.the corresponding Salem Unit 2 technical specifica!

.i has a surveillance requirement for inverters."

Generic Letter 91-11, " Resolution of Generic Issues 48, "LCOs for Class IE Vital Instrument Buses," and 49, " Interlocks and LCOs for Class lE Tie Breakers" Pursuant to 10 CFR 50.54(f) (GL 91-11)," requested licensees to, among other things, certify that plant procedures include surveillance requirements for inverters or other onsite power sources to the vital instrument buses.

By letters dated January 31, 1992, August 14, 1992, and October 28, 1992, Public Service Electric and Gas Company made such a certification or comitted to have the requested surveillance requirements for all inverters in place by December 1992.

Because this is in compliance with the requests contained in GL 91-11, the staff finds this acceptable.

In a phone conversion on November 10, 1992, between the NRC staff and the State of New Jersey representative, the State of New Jersey representative stated that l.

the inclusion of a specific statement in the technical specification for surveillance requirements for inverters at Salem I was not required and their i

coment was considered resolved.

4.0 ENVIRONMENTAL CONSIDERATION

The amendment changes a requirement with respect to installation or use of a facility component located within the restricted area as defined in 10 CFR Part 20.

The NRC 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 exposure. The Comission has previously issued a proposed finding that the-amendment involves no significant hazards consideration, and there has been no public comment on such finding (57-FR 45086). Accordingly, the 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 prepar(ed in connection with the issuance of the amendment.

5.0 CONCLUSION

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

public w(1) there is reasonable assurance that the health and safety of the ill not be endangered by operation in the proposed manner, (2) such activities will be conducted in compliance with the Commission's regulations, and (3) the issuance of the amendment will not be inimical' to the comon defense and security or to the health and safety of the public.

Principal Contributor: -J.-Stone Date: November 20, 1992

.. ~

November 20, 1992 Docket No. 50-272 Mr. Steven E. Miltenberger Vice President and Chief Nuclear Officer Public Service Electric & Gas Company Post Office Box 236 Hancocks Bridge, New Jersey 08038

SUBJECT:

VITAL INSTRUMENT BUS INVERTERS, TECHNICAL SPEClflCATIONS, SALEM NUCLEAR GENERATING STATION, UNIT 1 (TAC NO. M84419)

The Commission has issued the enclosed Amendment No.137 to f acility Operating License No. DPR-70 for the Salem Nuclear Generating Station, Unit No.1.

This amendment consists of changes to the Technical Specifications (TS) in response to your application dated August 14, 1992.

This amendment revises the TS for the operation of the vital instrument bus inverters at Salem, Unit 1 to make them identical to the TS currently in place for Salem Unit 2.

A copy of our safety evaluation is also enclosed.

Notice of Issuance will be included in the Commission's biweekly Federal Reaister notice.

You are requested to notify the NRC, in writing, when the amendment has been implemented at Salem, Unit 1.

Sincerely,

/S/

James C. Stone, Senior Project Manager Project Directorate 1-2 Division of Reactor Projects - 1/11 Office of Nuclear Reactor Regulation 1.

Amendment No.137 to License No. DPR-70 2.

Safety Evaluation cc w/ enclosures:

% 014o See next page

.A DISTRIBUTION w/ enclosures:

. Docket File JStone ACRS(10)

NRC & Local PDRs OGC OPA PDI-2 Reading DHagan, 3206 0C/LFMB SVarga GHill(4), PI-22 EWenzinger, RGN-I JCalvo Wanda Jones, P-370 JWhite, RGN-1 CMiller CGrimes llE-21 M0'Brien(2)

CBerli er

/

%ddMM OFC

Ppl-2/LA :PDI g :0C gr.

lSELB/ fi'j iPDI-2/D

)

mn 9 i RAM lIETEN :JSTONL:rb :

CB lHGER:CMIh 4

/

DATE : j[/j92

10/p /92 :jj /p /92

p/d/92

lI/w/92 1

e