ML20237F601

Forwards Response to NRC 870709 Request for Addl Info Re Control Room Habitability for Plant.Calculations Performed in Support of NUREG-0737,Item III.D.3.4 Under Review for Possible Revs.Initial Results Anticipated by 870930

ML20237F601
Person / Time
Site:	Zion  File:ZionSolutions icon.png
Issue date:	08/13/1987
From:	Leblond P COMMONWEALTH EDISON CO.
To:	NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM)
Shared Package
ML20237F603	List: ML20237F601 ML20237F636 ML20237F664 ML20237F679 ML20237F693 ML20237F727 ML20237F743
References
RTR-NUREG-0737, RTR-NUREG-737, TASK-3.D.3.4, TASK-TM 3449K, TAC-65884, TAC-65885, NUDOCS 8708210515
Download: ML20237F601 (2)

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Comm!nw:dth Edison Ons First Nitionil Plaza, Chicago, Illinois 3e b' - 3 dress Reply to: Post Office Box 767 )

Chicago, Illinois 60690 0767 t

August 13, 1987 p.

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.U.S. Nuclear, Regulatory Commission Attn: ' Document Control Desk Washington,.DC' 20555

Subject:

Zion Nuclear Power Station Units 1 and 2 L

• Control Room HVAC NRC Docket Nos. 50-295 and 50-304 TAC Nos. 65884/5

References:

(a) July 9, 1987 letter from D.R. Muller to D.L. Farrar (b) September 1, 1981 letter from L.O. De1 George to D.G. Eisenhut Gentlemen:

Reference (a) provided Commonwealth Edison Company with a request for additional information regarding the habitability of Zion's Main control Room. This request centered on five areas.

1. Provide an accurate description of the "as built" system and its operation and maintenance; j

2. provide a description of the testing performed, including test results;

3. verify the~ system flow rates, including all inleakage rates, during the various modes of system operation;

4. identify all significant deviations of the "as built" system and its operation, maintenance and testing from the description as  ;

contained in the FSAR and elsewhere;

5. demonstrate that the system meets the requirements of GDC-19 by analysis and results of tests.

Enclosed with this submittal are the following documents;

1) Two copies of the Sargent and Lundy report titled " Evaluation of Control Room HVAC System-PV and Computer Room and Miscellaneous Room HVAC System-OV", dated April 29, 1987.

2) .The control Room HVAC' System Pre-Operational test performed in early 1973.

3) Zion Station procedure TSGP-47, Control Room Ventilation System Ductwork Inleakage Test, completed March 11, 1987.

8708210515 870813 PDR ADOCK 05000295 P pon ,

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• 4) A sample copy of Zion Station procedure PT-18, Control Room Charcoal Booster Fans Test. In addition, the Operating Department monitors pV system mechanical performance shiftly.

5) A maintenance history of the Control Room HVAC System consisting of 3 copies of completed work requests and a printout of recent work j l

done.

6) May 7, 1986, Entech letter from J.N. Hamawi to Nicholas Konstantinou documenting sensitivity studies performed in support of TSGP-47,

7) Copies of three ventilation tests, TSS 15.6.14A, B, and C. These procedures control the testing of filters and the measurement of make-up flow rates.

The control room make-up flow rate of 2,000 CFM is routinely measured whenever the make-up charcoal filters are tested. This test is performed after every 720 hours0.00833 days <br />0.2 hours <br />0.00119 weeks <br />2.7396e-4 months <br /> of charcoal filter operation in accordance with Technical Specification 4.17.1. The only other system flowrate that has been verified is the air inleakage rates measured in TSGP-47.

The Sargent and Lundy report provides a detailed description of the "as-built" system. Included in this report is the identification of all deviations from the "as-designed" system.

Finally, reference (b) provided the NRC with a description of the Control Room Habitability calculations for Zion Station. These calculations were performed in support of Nureg 0737, Item III.D.3.4. Zion Station continues to operate within the bounds of this analysis.

However, the analysis contained in reference (b) has a number of elements that may be candidates for alteration. As a result, Commonwealth Edison and its consultants are reviewing this calculation to determine if a revised calculation is warrented. This initial assessment is expected to be complete by September 30, 1987.

Commonwealth Edison Company will advise you of the results of this review and provide the NRC with the schedule for any additional work.

If any further questions arise, please direct them to this office.

Very truly yours, N

P. C. LeBlond Nuclear Licensing Administrator Enclosures cc: W/O Enclosures J. A. Norris - NRR Resident Inspector - Zion 3449K

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