ML20150F303

Safety Evaluation Supporting Amend 106 to License DPR-29

ML20150F303
Person / Time
Site:	Quad Cities
Issue date:	03/28/1988
From:	Office of Nuclear Reactor Regulation
To:
Shared Package
ML20150F291	List: ML20150F290 ML20150F303
References
NUDOCS 8804050138
Download: ML20150F303 (2)

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UNITED STATES

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NUCLEAR REGULATORY COMMISSION WA&MINGTON D. C. 206H i

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SAFETY EVALUATION BY THE OFFICE OF NUCLEAR REACTOR REGULATION SUPPORTING AMENDMENT NO. 106 TO FACILITY OPERATING LICENSE NO. OPR-29 COMMONWEALTH E0! SON COMPANY AND 10WA.!LLIN01S GAS AND ELECTRIC COMPANY QUA0 CITIES NUCLEAR POWER STATION, UNIT 1 i

DOCKET NOS. 50-254

1.0 INTRODUCTION

t 3y letter dated November 17, 1987, Coelnonwealth Edison Company (CECO),

the licensee for Quad Cities Nuclear Power Station (QCNPS), Unit 1, requested changes to Technical Specifications (TS) 3.4/4.4 with regard to theStandbyLiquiaControlSystem(SLCS).

These proposed TS changes i

reflect a plant modification which increased the concentration of sodium pentaborate in the SLCS tank to 14 weight percent. This increase in concentration in conjunction with the capability to operate both SLCS 4

pumps sinultaneously at a tote; sombined flow rate of 80 gpm was done to satisfy, in part, the requirements of 10 CFR 50.62. The SLCS design modification and implementation schedule to comply with 10 CFR 50.62 was described by CECO in letter datsd September 30, 1987. Ceco has also l

i proposed (in the November 17 letter) TS changes to decrease the minimum required liquid poison volume from 3470 gallons to 3321 gallons, to periodically test the SLCS pumps (one pump at a time), and increase the relief value pressure setting range by 55 psig.

2.0 EVALUATION i

TS changes proposed by Ceco, and their description of unit modifications

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to the SLC%, have been reviewed by the staff against the requirements of the ATWS rule (10 CFR 50.62), and Generic Letter 85 03 "Clarification of Equivalent Control Capacity for Standby Liquid Control Systems" dated January 28, 1985.

Increasing the SLCS sodium pentaborate concentration to 14 weight percent in conjunction with a flow rate of 80 gpm provides a boron content equivalent in control capacity to 86 gpm of 13 weight 3

percent socium pentaborate. This is in compliance witn 10 CFR 50.62 and is therefore acceptable.

l The licensee's proposal to change the TS required liquid poison tank volume from a minimum of 3,470 gallons to a minimum 3.321 gallons i acceptablebecausewithanincreasedsolutionconcentrationof14I,s3,321 l

J galbns will provide the same total amount of poison and shutdown rargin as

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the lower concentration / higher volume solution currently used.

J 8804050130 000320 PDR ADOCK 05000254 4

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Additionally, the proposal to periodically test only one SLCS pump at a time instead of both pumps simultaneously is also acceptable. This is based upon Ceco's performan:e of initial two-pump tests, correlation of single pump data to the initial two-pump data, and subsequent comparison of the periodic single pump test data to the initial test data for verification of system capability.

Revised surveillance requirements were also proposed to increase the allowablu TS setpoint band for the system pressure relief valves from the current range of 1400 - 1490 psig, to a band of 1455 - 1545 psig l

because of increased purp discharge pressure during two pump operation.

A reault of two pump SLCS operation is that discharge pressures will be higher. Accordingly, the allowable system pressure relief valve setpoints have been increased by approximately 55 psig.

Furthennore, new and revised TS bases were proposed to reflect the above changes and SLCS modific:

All oforementioned TS changes are consistent i

iLCS to comply with 10 CFR 50.62, and art with modification rade t~

4 therefore acceptable, i

3.0 ENVIRONMENTAL CONSID HATION This amendment involves a changa to a requirement with respect to the installation or use of a facility component located within the restricted i

area as defined in 10 CFR Part 20, and changes to m 3111ance requirements. The staff has deter,ained this amende t ?ivolves no significant increase in the amounts, and no signifie-

hange in the types, of any effluents that may be released offsite and that there is no significant increase in individual or cumulative occupational radiatioh exposure. The Comission has preiviously issued a proposed finding this amendment involves no significant hazards consideration and there has been no public connent on such finding. Accordingly, the amendment meets eligibility criteria for categorical exclusion set forth in 10CFR51.22(c)(9).

Pursuant to 10 CFR 51.22(b) no environmental impact stotement nor environmental assessment need be prepared in connection with the issuance of this amendment.

4.0 CONCLUSION

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

(1) there is reasonable assurance that the health and safety of I

the public will not be endangered by operation in the proposed manner, and (2) such activities will be conoucted in C0mpliance witie the Comission's regulations and the issuance of this amendment will not be l

inimical to the comon defense and security nor to the health and safety l

of the public.

Principal Contributor:

T. CoII1ns and T. Ross Dated: March 28, 1988 l

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