ML19210A472

Tech Spec Change Request 24 Supporting Licensee Request to Change DPR-50,App a Re Ultraviolet Defectors in Air Intake Tunnel Fire Protection Sys.Certificate of Svc Encl

ML19210A472
Person / Time
Site:	Three Mile Island
Issue date:	11/03/1975
From:	Arnold R METROPOLITAN EDISON CO.
To:
Shared Package
ML19210A469	List: ML19210A468 ML19210A472
References
NUDOCS 7910300508
Download: ML19210A472 (7)

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• METROPOLITAN EDISON COMPANY J. ISEY CENTRAL POWER & LIGHT COMPANY AND PENNSYLVANIA ELECTRIC COMPANY -

THREE MILE ISLAND NUCLEAR STATION UNIT 1 Operating License No. DPR-50 Docket No. 50-289 Technical Specification Change Request No. 24 This Technical Specification Change Request is submitted in support of Licensee's request to change Appendix A to Operating License No. DPR-50 for Three Mile Island Nuclear Station Unit 1. As a part of this request, proposed replacement pages for Appendix A are also included.

METROPrLITAN EDISON COMPANY q  ?

By f b Vice Pr'ehdent-Ge'neration Sworn and subscribed to me this 8- day of 1.<v-* ~5-'a-- , 1975

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, METROPOLITAN EDISON COMPANY seas:masv or cuann puauc ununes cosposa rio?, l POST OFFICE BOX 542 READING, PENNSYLVANI A 19603 TELEPHONE 215 - 929-3601 November 3, 1975 GQL 1672 C

et' t  : L'; '. ' . ---h Mr. Charles P. Hoy, Chairman Board of County Commissioners of Dauphin County ~ ' ] _ jf _

P.O. Box 1295 Harrisburg, Pennsylvania 17120

Dear Mr. Hoy:

Enclosed please find one copy of Technical Specification Change Request No. 24 to Appendix A of the Operating License for Three Mile Island Nuclear Station Unit 1.

This request was filed with the U.S. Nuclear Regulatory Commission on November 3, 1975.

Very truly yours,

/s/ R. C. Arnold R. C. Arnold Vice President RCA:CWS:rk File 20.1.1/7.7.4.3.6.1 1487 131

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METROPOLITAN EDISON COMPANY suesmuar or ceneau rusucununn coneo.unou /

POST OFFICE BOX 542 READING, PENNSYLVANI A 19603 TELEPHOP E 215 - 929-3601 November 3, 1975 GQL 1672 Mr. Weldon B. Arehart, Chairman Board of Supervisors of Londonderry Township R.D. #1 Geyers Church Road Middletown, Pa. 17057

Dear Mr. Arehart:

Enclosed please find one copy of Technical Specification Change Request No. 24 to Appendix A of the Operating License for Three Mile Island Nuclear Station Unit 1.

This recuest was filed with the U.S. Nuclear Regulatory Commission on November 3, 1975.

Very truly yours ,

/s/ R. C. Arnold R. C. Arnold Vice President RCA:CWS :rk File 20.1.1/7.7.4.3.6.1 1487 132

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Three Mile Is1cnd Nuclear Station Unit 1 (TMI-1)

Operating License No. DPR-50

• Docket No. 50-289

. It-3-75 Technical Specification Change Recuest No. 2h The licensee requests that the attached changed pages replace pages 5-8 and 5-9 of existing Technical Specifications.

Reason for Proposed Change As indicated in our Nonroutine 30-Day Report 75-05, it was discovered that the UV detectors installed in the Air Intake Tunnel Fire Protection System were not the detectors specified in the FSAR. This change is necessary in order to correct the Technical Specifications to a bases consistent with the presently installed U7 detectors. Also, this opportunity is being utilized to clarify certain statements made on pages 5-8 and 5-9 of Technical Specifications. No change or substitution of existing equipment is being made but only correct statenents regarding their operation are being included. These refer to the last sentence on page 5-8 of existing Technical Specifications and brief descriptions on page 5-9 regarding function and operation of pressure detectors, temperature detectors and smcke detectors.

Safety Analysis Justifying Change Nonroutine 30-Day Report 75-05 gives a comparison of the installed and specified UV detectors and shows that the installed detectors are satisfactory in all respects from a safety stand point and meet the original design criteria for this application. Therefore, there is no unreviewec safety question and no undue risk to the health and safety of the public.

1487 133

5.5 AIR IPTAKE TUtit!EL FIRE PROTECTI0ii SYSTE!:S Analicability Applies to the fire protection systens protecting the air intake tunnel.

Co.iective to provide fire prctection systers to prevent fire or explosive hydrocarbon vapcrs entering the control building through the air intake tunnel.

Snecification 5.5.1 An acceleroneter is attached to the air intake structure to detect its displacement.

552 Photocells (ultraviolet detectors) and Explosion Pressure detectors (static) are provided throughout the three air tunnel zones to indicate alar =s in the control roon, stop fans and close danpers at the air tunnel entrance to the control building, and actuate the Halon system in the affected zone or zones of the air intake tunnel. On the operation of any Halon syste=, all three water deluge syste=s are auto =atically operated.

5.5.3 Tenperature detectors (rate compensating actuated) are provided through-out the three sones of the air intake tunnel to indicate alares in the control rocc, stop fans and close dampers at the air tunnel entrance to the control building, actuate the water deluge systen in each of the three zones of the air intake tunnel.

5.5.4 Snoke and contustible vapor detectors are provided to indicate alar =s in the control room, stop fans, and close dampers.

5.5.5 Renote manual actuation stations are provided in the control rocn to stop fans, and close da=pers at the air tunnel entrance to the control building and to actuate individual vater deluge systems.

Bases All fire protection syste=s are designed to extinguish or suppress an explosion fran a vapor-air nixture.

Ealon systen discharge extinguish?r electrical data: ninicum firing current 1.0 crp, recor.nended firing current 5.0 anp. Operation: hydrostatic pressure is created by the e:: plosive actuatcr rupturing the burst disc along pre-scored lines.

Effective asent discharge is co=pletel within 600 tilliseconds.

7~.ter deluge systers are designed to give a 0.3 gp:/sq. ft. discharge throughout the air intake tunnel. The thermal detectors operate when the specified temperature (190 F 100 F) is reached or exceeded; and whenever the carrounding air tenperature reaches the temperature above which a fire condition is considered to exist under all conditicns of rates of rise as specified by Underwriters Inboratories Test. (Rate compensation) 1487 134 5-8

. Photocell detectors - Operation: Normally open gate circuit closes when ultraviolet radiation from a flame or arc is present within the detector cone of vision. Performance: The detector arrangement with regard to sensi ivity, Spectral response, and cone of vision sht.ll be compatible with the application, in that, the response times vill be sufficiently rapid to permit suppression and or inerting of the deflagration, as applicable.

Explosive Pressure Detectors - Operation: Ucrmally open contact oleses when the static pressure setting is exceeded. Range: 0-5 psi; field adjustable.

Temperature detectors: Operation - The detectors operate when their temperature reaches or exceeds 1900 F 1 100F; and whenever the surrounding air temperature reaches a temperature above V.:ich a fire condition is considered to exist under all conditions of rates of rise as specified by Underwriters Laboratories Tests.

Vapor detectors: Operation - Ionization type which functions when surrounding air reaches the alarm set point.

Smoke Detectors: Ionization type which vill respond to an alarm condition when products of combustion are generated by a deflagration in the tunnel.

1487 135 5-9

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UNITED STATES OF AMERICA NUCLEAR REGULATORY COFDf1SSION IN THE MATTER OF DOCKET NO. 50-289 OPERATING LICENSE NO. DPR-50 METROPOLITAN EDISON COMPAW This is to certify that a copy of Technical Specification Change Request No. 24 to Appendix A of the Operating License for Three Mile Island Nuclear Station, Unit 1, dated November 3,1975, and filed with the U. S. Nuclear Regulatory Commission November 3,1975, has this 3rd day November,1975, been served on the chief executives of Londonderry Township, Dauphin County, Pennsylvania, and of Dauphin County, Pennsylvania, by deposit in the United States Mail, addressed as follows:

Mr. Weldon B. Arehart, Chairman Mr. Charles P. Hoy, Chairman Board of Supervisors of Board of County Commissioners of ondonderry Township Dauphin County R.D.!/1, Geyers Church Road Dauphin County Courthouse Middletown, Pennsylvania 17957 Harrisburg, Pennsylvania 17120 METROPOLITAN EDISON COMPANY By /

Vice PredIdent-Generation 1487 136 12704