ML20094D305

Safety Evaluation Supporting Amend 3 to License NPF-18

ML20094D305
Person / Time
Site:	LaSalle
Issue date:	07/24/1984
From:	Office of Nuclear Reactor Regulation
To:
Shared Package
ML20094D296	List: ML20094D292 ML20094D305
References
NUDOCS 8408080322
Download: ML20094D305 (2)

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SAFETY EVALUATION AMENDMENT NO. 3 TO NPF-18 LA SALLE COUNTY STATION, UNIT 2 DOCKET NO. 50-374 Introduction By letter dated May 24, 1984, Commonwealth Edison Company (licensee) proposed an amendment that would change the La Salle County Station, Unit 2 Technical Specifications to include a previously approved reactor trip setting on low control rod drive pump oischarge water header pressure and delete an associated surveillance requiremer.t.

The proposed Technical Specification change is in accordance with the setpoints and conditions as discussed in Section 7.2.3.2 of Supplement No. 7 to the Safety Evaluation Report.

Evaluation In response to a concern that the control rod drive accumulators do not maintain adequate pressure for a period of time compatible with operator action when the reactor is at less than operating pressure, the licensee proposed installation of an automatic reactor trip that would scram the control rods in the event of low control rod drive pump discharge pressure.

This scram would be operational by the mode switch. This modification to the La Salle design was evaluated and approved by the NRC staff in Section 4.6.2 of Supplement No. 2 and Section 7.2.3.2 of Supplement No. 7 to the Safety Evaluation Report, and accordingly, a license condition was included in the license for its completion.

We have reviewed the Techr.ical Specification limiting condition for operations and surveillance requirements for the proposed reactor trip instrumentation (Tables 3.3.1-1 and 4.3.1.1-1) and conclude that they are acceptable. The reactor trip on low control rod drive pump discharge water header pressure has been designed and is being installed in La Salle, Unit 2.

The licensee also requested the deletion of surveillance requirement 4.1.3.5.b.2, which verifies that each accumulator maintains its pressure abcVe the alarm setpoint for at least 10 minutes. This surveillance requirement will no longer be needed to insure that the reactor can be scrammed when the new trip is installed.

Therefore, based upon our evaluations, we have determined that the Technical Specification changes, for addition of the reactor trip on low control rod drive pump di_ charge pressure and deletion of the surveillance requirement on accumulator pressure, are acceptable. Accordingly, we find that the licensee has complied with the condition set forth in license condition 2.C.(7) and that license condition 2.C.(7) be deleted.

Environmental Consideration This amendment involves a change in the installation or use of a facility component located within the restricted area as defined in 10 CFR Part 20.

The staff has deternined 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 inoividual or cumulative occupational radiation exposure.

The Comnission has previously issued a proposed finding that this anendnent involves no sigrificart hazards 8408080322 840724 PDR ADOCK 05000374 P

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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 Sec 51.22(c)(9).- Persuant to 10 CFR 51.22(b) no environmental impact; statement or environmental assessment need be prepared in connection L wi th (the. issuance ~'of ' thibamendynt.

IConclusion-

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-We have concluded, based on the considerations discussed above, that:

- there is reasonhbio assurance"that the health and-safety of the public will not be endangerfd by operation in the proposed manner, and (2) such

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activities-w1173be conductedjin' compliance with the-Commission's regulations and. the J'ssuancpof this sinendment/.will not be iMmical to the connon i

..c q 4/;,7 defer.sr/4nd'secur,ity or to the becith and safety of the public.

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/ Dated 8.. July 24,1984' 2,'

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