ML20213G304

Forwards Safety Evaluation Re Thermal Adequacy of Suppression Pool Temp Monitoring Sys to Provide Conservative Indication of Bulk temp.Local-to-bulk Temp Difference Test Results Applicable & Acceptable

ML20213G304
Person / Time
Site:	LaSalle
Issue date:	11/12/1986
From:	Adensam E Office of Nuclear Reactor Regulation
To:	Farrar D COMMONWEALTH EDISON CO.
Shared Package
ML20213G306	List: ML20213G304 ML20213G318
References
NUDOCS 8611180027
Download: ML20213G304 (3)

Text

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November 12, 1986 Docket No. 50-373 DISTRIBLITION:

lEcET15""TO-373 >

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Mr. Dennis L Farrar NRC PDR Attorney, OGC Director of Nuclear Licensing local PDR JPartlow Commonwealth Edison Company BWD-3 r/f EJordan P.O. Box 767 EAdensam BGrimes Chicago, Illinois 60690 EFylton ACRS (10)

ABournia

Dear Mr. Farrar:

RBernero

Subject:

Acceptance of the maximum Local-to-Bulk Pool Temperature difference during Safety Relief Valve Discharge - La Salle County Station, Unit 1 In the la Salle Safety Evaluation Report, you agreed to utilize information from the safety relief valve test program to establish the maximum local-to-bulk suppression pool temperature difference during safety relief valve dis-charge. In addition, the test program was to establish the adequacy of the suppression pool temperature monitoring system to provide a conservative in-dication of bulk temperature. We have reviewed your final test report, dated September 1983, relating to the above two objectives. Our evaluation is en-closed as Enclosure 1 and is based on the Technical Evaluation Report perform-ed by our consultant from Brookhaven National Report enclosed as Enclosure 2.

We concluded that you have met the ob.iectives of the plant specific test by determining that: (a) a local-to-bulk pool temperature difference of 12 F is acceptable for use during plant transients within the design bases involving safety relief valve discharge in Mark Il plants that utilize the Mark II T-quenchers similar in design to those installed at the la Salle Unit 1; and (b) La Salle Unit 1 suppression pool temperature monitoring system is accept-able in terms of the number of sensors and their spatial arrangement. The acceptance criteria are contained in NUREG-0487, " Mark II Containment Lead Plant Program Load Evaluation and Acceptance Criteria," November 1978 and NUREG-0783, " Suppression Pool Temperature limits for BWR Containments,"

November 1981.

The la Salle Unit I suppression pool geometry and type of T quenchers are similar to those in the other Mark 11 containment plants (Limerick Unit 1 and 2, Nine Mile Point Unit 2, Shoreham, and Susquehanna Units 1 and 2). Therefore, the la Salle Unit I local-to-bulk temperature difference test results are appli-cable and acceptable for the other Mark II containment plants indicated above.

8611180027 861112 3 PDR ADOCK 0500 w- ,,y -

-2 If you should have any questions, please contact Anthony Bournia, Project Manager, at (301) 492-8698.

4 Sincerely, Elino G. Adensam, Director BWR Project Directorate No. 3 Division of BWR Licensing

Enclosures:

As stated cc: See next page i

BWD-3: DBL LAjp  : DBL

1. /r D:BWD-3: DBL ABournia/vag ,E6yllon EAdensam 11/lv/86 11//M86 11/)VB6 l

Mr. Dennis L. Farrar la Salle County Nuclear Power Station Commonwealth Edison Company Units 1 & 2 cc:

Philio P. Steptoe, Esquire John W. McCaffrey Suite 4200 Chief, Public Utilities Division One First National Plaza 160 North La Salle Street, Room 900 Chicago, Illinois 60603 Chicago, Illinois 60601 Assistant Attorney General 188 West Randolph Street Suite 2315 Chicago, Illinois 60601 Resident Inspector /LaSalle, NPS U.S. Nuclear Regulatory Commission Rural Route No. 1 P. O. Box 224 Marseilles, Illinois 61341 Chairman La Salle County Board of Supervisors la Salle County Courthouse Ottawa, Illinois 61350 Attorney General 500 South 2nd Street Springfield, Illinois 62701 Chairman Illinois Commerce Commission Leland Building 527 East Capitol Avenue Springfield, Illinois 62706 Mr. Gary N. Wright, Manager Nuclear Facility Safety Illinois Department of Nuclear Safety 1035 Outer Park Drive, 5th Floor Springfield, Illinois 62704 Regional Administrator, Region III U. S. Nuclear Regulatory Commission 799 Rossevelt Road Glen Ellyn, Illinois 60137

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