ML19343B584

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Responds to Item 3 of NRC 801001 Ltr to All BWR Licenses Re BWR Scram Sys.Preliminary Evaluation of Scram Sys Has Been Performed.Listed Mods Are Being Evaluated.Mods Will Be Installed During First Outage After Receipt of Matl
ML19343B584
Person / Time
Site: Cooper Entergy icon.png
Issue date: 12/15/1980
From: Pilant J
NEBRASKA PUBLIC POWER DISTRICT
To: Eisenhut D
Office of Nuclear Reactor Regulation
References
LQA8000447, NUDOCS 8012240287
Download: ML19343B584 (2)


Text

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LQA8000447 December 15, 1980 s

Mr. Darrell G. Eisenhut, Director Division of Licensing Office of Nuclear Reactor Regulation U. S. Nuclear Regulatory Commission Washington, D.C. 20555

Subject:

BWR Scram System y J:

Reference:

(1) D. G. Eisenhut letter to All BWR Licensees Dated October 1, 1980 (2) J. M. Pilant letter to Eisenhut Dated October 22, 1980

Dear Sir:

Pursuant to our reference letter dated October 22, 1980, the following is our response to item 3.

The preliminary evaluation of our present scram system has been per-forued and the following modifications are being evaluated and upon completion of final design, these modifications will be installed during the first outage of sufficient duration af ter receipt of material.

1. Installation of an independent scram discharge instrumentation volume tank with applicable level switches on the north scram discharge volume header. This scram discharge instrumentation volume will have an independent air operated drain valve and it will drain to the reactor building equipment drain system.
2. Installation of an independent scram discharge instrumentation volume tank on the south scram discharge volume header _or replace the existing 2" drain pipe between the south scram discharge volume header and the existing scram discharge instrumentation volume tank with 8" pipe.

L

.8012240 M f

Mr. Darrell G. Eisenhut December 15, 1980 Page 2.

3. Install another air operated vent valve and associated vacuum breaker on the north and south scram discharge volume headers.

This will provide a total of 4 air operated vent valves and vacuum breakers supplying each of the four legs of the north and south scram discharge volume headers, respectively.

The above modifications require a plant outage for installation and Cooper Nuclear Station has scheduled a refueling outage for late spring 1981.

In addition, an operable ultrasonic (UT) level detection system is currently installed on the north and south scram discharge volume headers. Secondly, a float type level indicator is installed on each of the scram discharge headers.

If there are any questions concerning the above response, please contact L. C. Lessor at Cooper Nuclear Station.

Sincerely, M

37'MI Pilant Director of Licensing and Quality Assurance ,

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