ML20052D694

Forwards Response to 820111 Request for Addl Info Re Fire Detection Sys at Facility

ML20052D694
Person / Time
Site:	Clinton
Issue date:	04/29/1982
From:	Wuller G ILLINOIS POWER CO.
To:	John Miller Office of Nuclear Reactor Regulation
References
U-0475, U-475, NUDOCS 8205070117
Download: ML20052D694 (8)

Text

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ILLIN0/S POWER 00MPANY g,

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Mr. James R. Miller, Chief 7q 13 s 6N ;7 Standardization & Special Projects Branch Division of Licensing Y Og Q(jjs z .s m g4 s

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Office of Nuclear Reactor Regulations \ (.s '4 g U. S. Nuclear Regulatory Commission y >p Washington, D.C. 20555 Ul l h$

References:

1) Clinton Power Station Safety Evaluation Report, Section 9.5.1.4 re: Fire Detection Systems

2) Letter, J. D. Geier to J. R. Miller, U-0391, dated 12-14-81 Clinton Power Station Unit 1 Docket No. 50-461 Safety Evaluation Report Supplemental Fire Detection Information On December 10, 1981, Alan L. Ruwe (IP),_ Mark S. Zar (S&L) and J. Scott Steele (S&L) met in Bethesda with John Stang (NRC Chemical Engineering Branch) to discuss the Clinton fire detec-tion system. The letter in reference 2 transmitted attachments which documented the agreements reached during that meeting and indicated that this topic was considered confirmatory by the NRC and IP.

On January 11, 1982, Mr. Stang contacted Illinois Power with additional questions on the Clinton fire detection system. The attachment to this letter provides the requested information.

Illinois Power believes all requested information has now been provided to the NRC on the subj ect issue and now considers this confirmatory item closed.

Sincerely, 3s ) ,

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8205070117 820429 '

G. E. Wuller PDR ADOCK 05000461 F PDR Supervisor-Licensing Nuclear Station Engineering GEW/lt Attachment (1) cc: J. H. Williams , NRC Clinton Proj ect Manager

< John Stang, NRC CEB H. H. Livermore, NRC Resident Inspector Illinois Department of Nuclear Safety

Attechment MAIN CONTROL ROOM FIRE PROTECTION ANNUNCIATOR Gene ral The Fire Protection Annunciator is located at panel lH13-P840 in the Main Control Room. It serves as the central alarm panel for the Clinton Fire Detection and Protection System. Its purpose is to attract the operator's attention to fire protection system variables that are off-normal. This is accomplished by the use of flashing lighted windows and audible alarms.

Power Sources The primary power source for the annunciator is the station non-Class 1E 125V de power supply which has a four-hour battery backup following the loss of offsite power. A dedicated circuit is provided so the annunciator can be manually connected to a Cices 1E power supply within four hours following. the loss of offsite power. The annunciator is equipped with a power failure alarm which operates f rom a non-Class 1E 120V ac power supply. It consists of a dedicated annunciator point and alarm horn.

Eauipment Design The annunciator is of the solid state type, utilizing plug-in type cards, plugs, and receptacles. The window displays are flush mounted in panel 1H13-P840 and the window control logic is contained on a single printed circuit board that plugs into an edge connector. Each window contains two long-life light bulbs which are wired in parallel and which are tested once each 8-hour shif t.

Detection of a fire is alarmed on the P840 annunciator and at the local super-visory control panel. Both panels also have lights which indicate the specific zone initiating the alarm. Should the P840 zone light fail, the P840 annun--

ciator window would initiate operator action to inspect the local supervisory control panel to determine the specific zone initiating the alarm.

The annunciator has three audible alarms - an alarm horn, a ringback horn and a power failure horn -all are distinctly different. Operation of an audible alarm on the P840 Fire Protection Annunciator also alarms an annunciator point on the Balance of Plant Benchboard Annunciator located at panel lH13-P870 in the Main Control Room to further attract the operator's attention.

The P840 annunciator has three flash rates - a fast flash, a slow flash and a galloping flash all are distinctly different. The fast flash rate is 10.8 Hz Page 1 of 7

with.a 50 percent duty cycle; the slow flash rate is 1.2 Hz with a 50 percent duty cycle; and the galloping flash rate consists of the fast flash and the slow flash AND'ed together; i.e., annunciator window is flashing at fast flash rate during the slow flash rate "on" time and window is off during slow flash rate "off" time.

The annunciator has four momentary pushbuttona used in its operation. They are labeled Silence, Acknov . edge, Re se t and Te s t.

Circuits Monitored For Integrity The annunciator monitors the integrity of primary incoming fire alarm circuits from systems located in buildings containing safety-related equipment and cer-tain other fire-related alarm circuits. The circuits monitored for integrity meet the performance requirements of Style 1 listed in Table 3-10.1 cf NFPA 72D-1979.

The galloping flash is provided at the annunciator to indicate the integrity of monitored circuits. The galloping flash indicates trouble due to an open in the field wiring of a circuit. (See Figure 9.5-9 attached.) An open circuit occurring between the P840 annunciator and the local fire control panel will pre-vent the annunciator from receiving a fire alarm from the circuit. However, redundant fire alarm circuits are provided between P840 annunciator and the local panel.

A ground detection unit is provided at the P840 annunciator. It alarms a dedi-cated annunciator point if a ground occurs in the . wiring between the annunciator and the local panel.

A single ground does not . revent the annunciator f rom receiving an alarm f rom a circuit monitored for integrity.

Operation The annunciator logic sequence is illustrated in Figures 1, 2 and 3. Figure 1 applies to all the annunciator circuits, Figure 2 applies only for the circuits monitored for integrity and Figure 3 applies to the Power Failure Alarm.

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The operation of the annunciator pushbuttons must take place in the following sequence: Silence, Acknowledge and Reset. Any other sequence will not change the state of the ar.nunciator. Operation of the Test pushbutton will cause all the annunciator windows to fast flash and operate the audible alarms. Any con-ditions existing before the operation of the Test pushbutton will return af ter the test.

Page 2 of 7

The annunciator system is designed such that fire alarm conditions take pre-cedence _over trouble alarms for those circuits monitored for integrity.

Compliances-The annunciator meets the requirements of paragraph 2411 of NFPA 72D-1975.in

'the following manner:

1. The occurrence of a break or a ground fault condition in the field wiring of:an annunciator circuit monitored for integrity will be indicated at the annunciator by a distinctive troubic signal.

2. The failure of the annunciator main power supply source will be indicated at the annuntiator by a distinctive trouble signal.

An engineering evaluation was conducted to ascertain the conformance of *.he P840 annunciator to the applicable portions of UL 864-1980 (Standard for Control Units For Fire Protective Signaling Systems) . It is ovar opinion that the annunciator does meet the intent of the requirements necessary for a UL label; however, because the original purchase _ specification did not specify a UL label, the P840 annunciator does not carry the same.

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CLINTON POWER STATION UNIT 1 TYPICAL FIRE AND TROUBLE ALAPJI

.'- INDICATION FOR DETECTION AND SUPPRESSION

{ SYSTEMS LOCATED IN BUILDINGS

j CONTAINING SAFETY-RELATED EQUIPMENT 4

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. 1 I l Fire / Trouble Alarm Fire Alarm l l Annunciator Window Annunciator Window I __ ____

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I.H13-P840, j T = Fire Alarm Contact T = Trouble Contact R = End of Line Resister Circuit 1

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Circuit 1 operation providen separate visual indication of fire 6r trouble. Cit;cuit 2 provides redundant fire alarm

• receipt capability.

Page 7 of 7

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