ML20249A160

Informs That Ceco Submitted Change to Fols,Ts Bases Section 3/4.4.A, Standby Liquid Control Sys, & Erroneously Stated 3245 Gallons of Solution.Revised TS Page B 3/4.4-1 Encl

ML20249A160
Person / Time
Site:	Quad Cities
Issue date:	06/11/1998
From:	Pulsifer R NRC (Affiliation Not Assigned)
To:	Kingsley O COMMONWEALTH EDISON CO.
References
TAC-MA1704, NUDOCS 9806160122
Download: ML20249A160 (5)

Text

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~{f June 11, 1998

'Mr. Oliver D. Kingsley, President Nuclear Generation Group Commonwealth Edison Company Executive Towere West lli 1400 Opus Place, Suite 500 Downers Grove,IL 60515

SUBJECT:

TECHNICAL SPECIFICATIONS BASES CHANGE - QUAD CITIES NUCLEAR POWER STATION, UNITS 1 AND 2 (TAC NOS. MA1704 AND MA1705)

Dear Mr. Kingsley:

By letter dated May 5,1998, Commonwealth Edison Company (Comed) submitted a change to Facility Operating License Nos. DPR-29 and DPR-30, Appendix A, Technical Specifications (TSs) Bases Section 3/4.4.A, " STANDBY LIQUID CONTROL SYSTEM." In the second paragraph, the bases section erroneously stated, "A net quantity of 3245 gallons of solution...." The net quantity of solution was changed in error from 3254 to 3245 gallons when TS Bases page B 3/4.4-1 was last issued. Comed performed an evaluation pursuant to 10 CFR 50.59 and determined that an unreviewed safety question does not exist. The staff has no objection to this Bases change. Enclosed, please find the revised TS page B 3/4.4-1.

Sincerely,

/

ORIG. SIGNED BY

/

Robert M. Pulsifer, Project Manager Project Directorate lll-2 p

I Division of Reactor Projects - lil/lV Office of Nuclear Reactor Regulation Docket Nos. 50-254,50-265

Enclosure:

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June 11, 1998 Mr. Oliver D. Kingsley, President Nuclear Generation Group Commonwealth Edison Company Executive Towers West lli 1400 Opus Place, Suita 500 Down ers Grove, IL 60515

SUBJECT:

TECHNICAL SPECIFICATIONS BASES CHANGE - QUAD CITIES NUCLEAR POWER STATION, UNITS 1 AND 2 (TAC NOS MA1704 AND MA1705)

Dear Mr. Kingsley:

By letter dated May 5,1998, Commonwealth Edison Company (Comed) submitted a change to Facility Operating License Nos. DPR-29 and DPR-30, Appendix A. Technical Specifications (TSs) Bases Section 3/4.4.A," STANDBY LIQUID CONTROL SYSTEM." In the i

second paragraph, the bases section erroneously stated, "A net quantity of 3245 gallons of solution...." The net quantity of solution was changed in error from 3254 to 3245 gallons when TS Bases page D 3/4.4-1 was last issued. Comed performed an evaluation pursuant to 10 CFR 50.59 and determined that an unreviewed safety question does not exist. The staff has no objection to this Bases change. Enclosed, please find the revised TS page B 3/4.4-1.

j Sincerely, l

7 r

Robert M. Pulsifer, Project Manager Project Directorate 111-2 Division of Reactor Projects - lil/IV Office of Nuclear Reactor Regulation Docket Nos. 50-254,50-265

Enclosure:

Page B 3/4.4-1 cc w/ encl: See next page f

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O. Kingsley Quad Cities Nuclear Power Station.

Commonwealth Edison Company Units 1 and 2 cc:

Mechsel 1. Miller, Esquire Commonwealth Edison Company Sidley and Austin Site Vice President-Quad Cities l

One First National Plaza 22710 206th Avenue N.

Chicago, Illinois 60603 Cordova, Illinois 61242-g740 Commonwealth Edison Company Document Control Desk-Licensing Quad Cities Station Manager Commonwesith Edison Company 22710 206th Avenue N.

1400 Opus Place, Suite 400 Cordova, Illinois 61242-g740 Downers Grove, Illinois 60515 U.S. Nuclear Regulatory Commission Mr. David Halwig Quad Cities Resident inspectors Office Senior Vice President 22712 206th Avenue N.

Commonwealth Edison Company Cordova, Illinois 61242 Executive Towers West lli 1400 Opus Place, Suite 900 Chairman Downers Grove, IL 60515 Rock Island County Board of Supervisors Mr. Gene H. Stanley 1504 3rd Avenue PWR's Vice President Rock Island County Office Bldg.

Commonwealth Edison Company RockIsland, Illinois 61201 Executive Towers West lil i400 Opus Place, Suite 900 lilinois Department of Nuclear Safety Downers Grove,IL 60515 Office of Nuclear Facility Safety 1035 Outer Park Drive Mr. Steve Perry Springfield, Illinois 62704 BWR's Vice President Commonwealth Edison Company Regional Administrator Executive Towers West til

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U.S. NRC, Region lil 1400 Opus Place, Suite 900 801 Warrenville Road Downers Grove,IL 60515 Lisle, Illinois 60532-4351 Mr. Dennis Farrar William D. Leach Regulatory Services Manager Manager-Nuclear Commonwealth Edison Company 1

MidAmerican Energy Company Executive Towers West 111 l

907 Walnut Street 1400 Opus Place, Suite 500 i

P.O. Box 657 Downers Grove,IL 60515 Des Moines, Iowa 50303 l

Ms. Irene Johnson, Licensing Director Vice President-Law and Nuclear Regulatory Services Regulatory Affairs Commonwealth Edison Company MedAmerican Energy Company Executive Towers West lli One River Center Place 1400 Opus Place, Suite 500 106 E. Second Street Downers Grove, IL 60515 P.O. Box 4350 l

Davenport, Iowa 52808

e O. Kingsley Quad Cities Nuclear Power Plant Commonwealth Edison Company Units 1 and 2 l

Commonwealth Edison Company Reg. Assurance Supo visor-Quad Cities l

22710 206th Avenue N.

l Cordova, Illinois 61242-9740 Mr. Michael J. Wallace Senior Vice President Commonwealth Edison Company l

Executive Towers West lll 1400 Opus Place, Suite 900 Downers Grove,IL 60515 l

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n SLCS B 3/4.4 BASES 3/4.4.A STANDBY LIQUID CONTROL SYSTEM The standby liquid control system consists of an unpressurized tank for low temperature sodium pentaborate solution storage, a pair of full capacity positive displacement pumps, two explosive actuated shear plug valves, the poison sparger ring, and the necessary piping, valves and instrumentation. An OPERABLE standby liquid control system provides backup capability for reactivity control independent of normal reactivity control provisions provided by the control rods. OPERABILITY of the system is based on the conditions of the borated solution in the storage tank and the availability of a flow path to the reactor pressure vessel, including the pumps and valves. Two subsystems are regt. ired to be OPERABLE; each contains a pump, an explosive valve, and the associated pipeg, valves, and necessary instruments and controls to ensure an OPERABLE flow path.- A valve is also allowed to be in the notaccident position provided it can be aligned to the accident position from the control room, or locally by a dedicated operator inoperability of a nonredundant component, such as the tank, affects both l

subsystems.

The standby liquid control system provides the capa' ility for bringing the reactor from fuli o

power to a cold, xenon-free shutdown assuming that none of the withdrawn control rods can be inserted. To meet this objective, it is designed to inject a quantity of boron which produces a concentration of no less than 600 ppm of boron in the reactor core in less than 100 minutes.

This boron concentration is required to bring the reactor from full power to 3% Ak/k or a more subcritical condition, considering the hot to cold reactivity swing and xenon poisoning. An additional margin of 25% boron is provided to compensate for possible losses and imperfect mixing of the chemical solution in the reactor water. This results in an average concentration of 750 ppm of boron in the reactor core assuming no losses. - A not quantity of 3254 gallons l

of solution at less than or equal to 110'F and having a 14 weight percent sodium pentaborate i

(NA B oO,. 10H O) concentration is required to meet this shutdown requirement. An additional volume of solution is contained below the pump suction and is not available for 2 i 2

injection. Other equivalent combinations of increased concentration and reduced volume are also acceptable provided they have considered required temperatures and net positive suction head.

1 The specified pumping rate of 40 gpm will meet the above design objective. This insertion rate of boron solution will override the rate of reactivity insertion due to cooldown of the reactor following the xenon peak. Two-pump operation will enable faster reactor shutdown for i

anticipated transients without screm (ATWS) events. The required minimum flow combined i

l with the solution concentration requirements are sufficient to comply with the requirements of 10 CFR 50.62.

l With redundant pumps and explosive iriection valves and with a highly reliable control rod scram system, operation of the reactor is permitted to continue for short periods of time with the system inoperable or for longer periods of time with one of the subsystems inoperable.

Surveillance requirements are established on a frequency that assures a high reliability of the system. The standby liquid control system is operated by a five-position control switch which allows single pump operation for surveillance testing. This testing demonstrates the capability of l

firing the explosive trigger assemblies, and iriects clean demineralized water from the test tank to I

the reactor vessel to demonstrate the injection line isn't plugged. Locally controlled testing circulates sodium pentaborate from the storage tank, through one suction line, through a pump, and back into the storage tank. This is done separately for each system to demonstrate that both QUAD CITIES - UNITS 1 & 2 B 3/4.4-1 ISSUED BY LETTER DATED JUNE 11,1998