ML20147D340

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Proposed Alarm Sys Mods NFPA 72D Compliance
ML20147D340
Person / Time
Site: Rancho Seco
Issue date: 12/31/1987
From:
SACRAMENTO MUNICIPAL UTILITY DISTRICT
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ML20147D333 List:
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NUDOCS 8801200141
Download: ML20147D340 (26)
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ATTACHMENT II PROPOSED ALARM SYSTEM MODIFICATIONS NFPA 720 COMPLIANCE SACRA *iENTO MUNICIPAL UTILITY DISTRICT RANCHO SEC0 NUCLEAR GENERATING STATION DECEMBER, 1987 2

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RECORD OF REVISIONS Revision Page Description of Revision 0 Initial Issue i

TABLE-OF' CONTENTS Description Pm

' Record of Revisions i Table of Contents ii List of. Drawings iii

1.0 INTRODUCTION

1-1 1.1 Background 1-1 2.0 EXISTING EQUIPMENT DISCUSSION 2 2.1 Existing Equipment Description 2-1 2.2- Summary of Existing Deviations 2-4 2.3 Recommended changes 2-6 3.0 NEW EQUIPMENT DISCUSSIONS 3-1 3.1 New Equipment Description 3-1 3.2 Philosophy of System Design 3-2

i. 3.3 Recommended Equipment Locations 3-3 4.0

SUMMARY

4-1 4.1 Recommended Final Alarm System Configuration. el 4.2 Other Design Options 4-3

5.0 REFERENCES

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LIST OF DRAWINGS Number Description Drawing #1 - A, B Proposed Alarm System Block Diagram Drawing #2 Signalling Systems Mux. (DGP) locations iii

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1.0 INTRODUCTION

The purpose of this report is to recommend a proposed. design modification of the plant fire alarm signaling system at Rancho Seco Nuclear Generating Station. This modification is intended to upgrade the fire alarm system such that it will meet the requirements of National Fire Protection Association (NFPA). Standard 72D - Standard for the Installation, Maintenance, and Use of Proprietary Protective Signaling Systems.

1.1 Background

The District has committed to comply with NFPA 720 in its correspondence with the NRC. The major commitment is in the February, 1978 Safety Evaluation Report (SER) issued as Amendment 19 to the Facility Operating License. The following statement is made in Section 4.2 of the SER:

"The [ fire detection and signaling) system complies with those provisions of NFPA 720 (Class B) which are considered essential for this type of facility."

Another commitment was made in the District's response (05/01/76) to Branch Technical Position (BTP) APCSB 9.5-1. The District's response to the fire alarm system portion of BTP 9.5-1,Section IV.C.1(a), was as follows:

"The fire detection systems, valve tamper switch supervisory systems, sprinkler water flow detection systems, and the carbon dioxide systems supervision circuits all comply with the requirements of NFPA 720."

The District also stated in BTP 9.5-1 (response to Section IV, C.3(b)):

"The valve supervisory system is installed in accordance with NFPA 72D."

In 1985, the District performed an NFPA 72D Compliance evaluation for the plant alarm system (ERPT-M0033) which identified deviations against the existing alarm system. The corrective actions recommended within the report (along with other plant fire protection problems) were included in the District's System Status Report for Fire Protection Systems (FPS) in 1986 (See Problems #1 and #2 of the SSR). In May 1987, NRC Region V questioned the significance of the NFPA deviations called l out in the SSR and their potential impact on the Technical Specification l

Operability of the fire systems as well as any affect that these deviations would have on plant safe shutdown in the event of a fire.

The NRC expressed further concern that these deviations had not been l identified on the plant docket as discrepancies against the l previous District licensing commitments. It was reiterated at the time l

that NRC Generic Letter 86-10 identifies that a commitment to a given fire code subjects the licensee to potential inspection to that code.

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1.0 INTRODUCTION

As a result of these NRC concerns, the District generated eight ODR's against the failure of plant fire protection systems to meet NFPA criteria. Subsequent evaluation of District engineering reports which identified the NFPA deviations (as stated in the ODR's) found that one of the discrepancies did result in a violation of Technical Specification requirements under Section 4.18.1 - Failure to perform proper monthly testing of unsupervised annunciation circuits. Other deviations in the engineering reports, while not affecting operability or safe shutdown, had an impact on the reliability of the fire systems.

On June 15, 1987, the District submitted Licensee Event Report (LER) 87-29 which committed the District to the following action:

1) Prepare an internal report by October 31, 1987 which lists the NFPA deficiencies and addresses the corrective action necessary.
2) By December 31, 1987, submit a detailed plan and schedule for completion of the corrective actions to the NRC.
3) Replace the controller for electric driven fire pump P-440.
4) At a minimum, reconfigure the plant fire alarm aystem to comply with NFPA 72D prior to conclusion of Cycle 8.

Applicable code years for the Rancho Seco alarm systems are NFPA 72D, 1967 for the systems in the Auxiliary, Reactor, and the Turbine Buildings, as well as the Transformer Yard; NFPA 72D,1979 for the systems in the NSEB, TSC, and the DG Building.

This report will prescribe the design configuration changes needed in order to meet the minimum requirements of the NFPA 72D and will recommend other changes where necessary in order to provide meaningful annunciation.

1-2

2.0 EXISTING EQU!PMENT DISCUSSION 2.1 Existing Equipment Description The' Rancho Seco Nuclear Generating Statio,1 utilizes a variety of-detection and suppression systems throughout the facility. The existing equipment can be summarized as follows:

1) CO2 Suppression Systems -

Administration Building 1 Auxiliary Building 14 Canal Pump House 1 Nuclear Service Electrical Building 6 Turbine Building 5 27 systems

2) Halon. Suppression Systems -

Administration Building i Nuclear Service Electrical Building 2 i

Training & Records Building '2 Trailer "D" (Nuc. Engr. Doc. Control) 1 6 systems

3) . Deluge Systems -

Nuclear Service Electrical Building 2 Tank Farm 1 Transformer Yard 8 Turbine Building 5 i 16 systems 2-1

2.0 EXISTlNG EQUIPMENT DISCUSSION

4) Pre-Action Systems -

Auxiliary Building 1 Diesel Generator Building 2 Nuclear Service Electrical Building 2 I.O.S. Facility 4 9 systems

5) Wet-Pipe Sprinkler Systems -

Administration Building 1 Auxiliary Building 13 Nuclear Service Electric Building 1 P.A.P. Building 1 Rec. Warehouse 1 Switchyard Control Building 1 Training & Records Building 6 Turbine Building 2 Warehouse "A" 1 Warehouse "B" 1 28 systems

6) Fire Alarm Zones (no automatic actuation of suppression systems) -

Administration Building 1 Auxiliary Building 15 Central Alarm Station 1 Nuclear Service Electrical Building 3 2-2

.2.0 .EX1 STING EQUIPMENT DISCUSSION Reactor Building 3 Switchyard Control Building 1 Training & Records Building 12 Transformer Yard 1 Turbine Building :1 Warehouse "A" 1 Warehouse "B" 1 40 systems Each of-these systems (with the exception of the wet-pipe sprinkler systems) have an associated local panel (or panels) which receives input from manual or automatic initiating devices. Many of the local detection panels perform auxiliary . functions, such as shutting down fans, closing dampers,. and sounding local audible alarms.

Two Control Room annunciating methods are used. The signals from the zones in the Auxiliary Building, Turbine Building, Reactor Building, and Transformer Yard are annunciated at Control Room panels H-3FPA and H-3FPB. The signals from the NSEB, DGB, and the new fire alarm zones are annunciated through the Interim Data Acquisition and Display System-(IDADS) which utilizes a CRT screen and a printer. With the present design, the following buildings are local alarm only (no Control. Room annunciation):

Administration Building Canal Pump House Central Alarm Station p.A.P. Building Rec. Warehouse (water motor gong only)

Training & Records Building (this building now has main panel alarm only - ECN R-1925)

Trailer "D" (Nuc. Engr. Doc. Control) 2-3 f

2.0 EXIST"NG EQUIPMENT DISCUSSION The local fire alarm control panels for the C0 protected areas in the AuxiliaryBuildingareH-4FDC02AthroughH-4FDbO2L. These panels are located in Room 109 which is on the grade. level of the Auxiliary Building. H-4FDC02A througn H-4FDC02C contain the Pyrotronics High Voltage (250v dc) control units. Panels H-4FDC02D through H-4FDC02L contain the Pyrotronics Supplement,ary Relay Panels which relay the signals on to the Control Room and perform the auxiliary functioris, including sending signals to the Cardox CO2 panels to initiate the carbon dioxide discharge sequence.

The local control panel for mcst of the remaining zones in the Auxiliary Building and the Reactor Euilding is H-4FCP2 which is located in the Communications Room of the Auxiliary Building (Mezzanine level). The panel contaias primarily Pyrotronics High Voltage control units.

However, one low voltage (24v de) MD-24 Notifier control panel is also used.

The control units then relay their signals on to the auxiliary Potter and Brumfield relays which transmit signals to the Control Room and perform the auxiliary functions.

Panel H-4FCP1 is the local control panel for the Turbine Building and Transformer Yard. The panel contains low voltage (24v dc) Notifier control panels and Potter and Brumfield auxiliary relays.

The NSEB and DGB utilize a Pyrotronics System 3 modular control system.

Panels H-4FCP5 and H-4FCP10 are the local control panels for the NSEB and panel H-4FCP6 is the local control panel for the DGB. These three panels are located in their respective buildings. The panels transmit their signals onto the remote Anatec multiplexers which multiplex the signals on to IDADS.

Panel H-4FCP8 serves the new fire alarm zones in the Auxiliary Building and the Auxiliary Feed Water Pump Area. This panel also utilizes a Pyrotronics System 3 centrol system. It is located in the Communications Room, adjacent to pe'1el H-4FCP2.

2.2 Summary of Existing Deviations Because of limited annunciation windows on Control Room panels H3FPA and l H3FPB, signals from the various fire detection and suppression panels j have been combined to light one light. As a result, operator j interrretation of the signals is difficult in the present arrangement of

! signals. Additionally, in some panels, signals which should be monitored as separate signals are not monitored.

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, c2.0 EXISTINGLEQUIPMENT DISCUSS 10N The definition of terms used:in fire alarm signaling systems are as follows:

1) Alarm Signal - A signa' indicating an emergency requiring'immediate-action,-such as an alarm-for fire from a manual box, a water. flow alarm, an~ alarm from an automatic fire alarm system, or other emergency signal.

2)- Supervisory Alarm signal - A signal indicating the need of action in connection with the supervision of guards, sprinkler and other extinguishing systems, or equipment or with the maintenance features of other protective systems.

3) Trouble Signal - An audible signal indicating trouble of any nature, such as a circuit break or ground, occurring in the devices or wiring associated with a protective signaling; system.

Specifically, the existing system configuration has the following deviations from the NFPA 720 code: ,

1) Major portions of the fire alarm system lack specific approval (such as listing by Underwriters Laboratories, Inc.) for use as a proprietary protective signaling system.
2) Portions of the power supply equipment were not specifically approved for fire alarm service. In addition', compliance to NFPA 720 requirements for. secondary power supply could not be determined without-a detailed analysis of plant loads.
3) Portions of the signaling circuits and power supply.are not

. monitored for integrity (unsupervised) so that a single break or ground will be specifically annunciated in the Control Room.

4) Distinct annunciation is not provided in the Control Room for the following alarm and trouble signals:

a) Audible trouble signals are not distinctive from alarm signals on panel H3FPA.

b) Audible alarm and trouble annunciation is not provided for signals on IDADS.

c) A trouble signal instead of an alarm signal is annunciated when the first detector zone goes into alarm in the Auxiliary Building carbon dioxide protected areas (this condition has been partially corrected unt.er ECN R-1993 by addition of a main fire panel signal from H-4FDC02A).

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2.0 EXTSTING EQUIPMENT DISCUSS 10N d) When any zone controlled by a Pyrotronics ZIV-6 panel (H-4FCP2, H-4FDC02A through B) goes into alarm, both an alarm and a trouble signal is annunciated on Control Room panel H-3FPA.

e) A single break in some signaling circuits in the Auxiliary Building will cause a false alarm signal on Control Room Panel H-3FPA.

f) Distinct supervision of several components of the sprinkler and water spray systems is not provided.

g) Water flow alarm signals from the NSEB could be blocked by signals from valve position supervisory devices.

h) Loss of main power supply to Control Room panels H-3FPA and H-3FPB is not annunciated.

5) Panels H-3FPA and H-3FPB in the Control Room are not provided with automatic recording devices (i.e., a printer) to provide a permanent record of signals.
6) Smeke detector locations are inadequate in several areas.
7) The disconnecting means of power to IDADS is not clearly marked.

2.3 Recommended Changes The following equipment changes are recommended for existing panels and existing detection loops:

1) C07 Extinguishing panels (27 panels) - In the present wiring l arrangement, alarm, trouble, and supervisory signals are not I separated. Also, most panels do not have their internally mounted l pressure switch (i.e., discharge alarm signal) monitored. Thus, for all C07 panels it is recommended that they be wired to provide l for the foTlowing three signals:

1 l a) Panel Common Alarm and Trouble - The alarm and trouble l contacts can be wired such that they consume only one input to the new 72D system, but provide distinctive alarm and trouble signals. This alarm is a pre-discharge alarm.

b) Discharge Alarm - Monitor the CO2 panel's pressure switch (called a "PE relay" by the paneT manufacturer).

c) Supervisory Alarm - Monitor the CO2 panel's disable switch as a separate signal. Presently, the disable switch is combined with the panel's trouble relay contacts.

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2.0 EXfSTfNG EQUfPMENT DISCUSSION It should be noted that the detection loop alarm status (i.e., loop "A" and loop "B")'is obtained from the associated detection panel (except for the turbine bearing CO2 panels, H-4C0250 through H-4C0254, which monitor the detectors directly.

2) Halon Extinguishing Panels (6 panels) - It is recommended that the existing halon panels be monitored as follows:

a) NSEB.and Administration Building Panels - Monitor panel common alarm and trouble (one input to the new 720 system), monitor the pressure switch for-a discharge alarm, and monitor the detection loops which actuate the panel, b) T&R Building and Trailer "D" - Since these are small systems, monitor the panel's common alarm and trouble (one input to the new 72D system), and monitor the pressure switch for a discharge alarm. Detection alarms are not monitored as a separate signal, but do actuate the-panel's common alarm relay.

3) Deluge Systems - In the pneumatically actuated d(luge systems, the present design combines a flow alarm signal with a supervisory alarm signal (i.e., the DWFS and the PSL are combined), for the new 72D system, separate these signals. In other. deluge systems which utilize electrical detection devices, the water flow switch is combined with one of the detection loop alarm signals; for the new 720 system, separate the flow alarm from the detection system alarm signals.
4) pre-Action Systems (3 systems) - The pre-action systems combine signals which should be separated (for example, on zone 87 a valve position switch is combined with a PSL for the same system).
5) Water Suppression Systems (all system types) -

a) Valves - The fire water system has 78 valves which have position switches attached. In general, the present design combines several switches together or combines the valve position switches with other signals; for the new 720 system, monitor the valve position switches as individual supervisory alarm inputs.

b) Flow Alarms - In several wet pipe sprinkler systems, the water

, flow alarms are combined with detection loop alarms; for the new 72D system, monitor all flow switches as individual inputs. Also, it should be noted that in the present configuration, some water flow switches are combined with other water flow switches; examples of this are the Administration Building (6 switches combined) and Zone 42 (3 switches combined as one signal).

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2.0 EXTSTENG EQUIPMENT DISCUSSION

6) Detection loops - In general, many detection loops combine automatic area detection (i.e., smoke detectors), hand stations, flow switches, etc. on one detection loop. The recommended changes for the detection loops, in general, is to separate automatic area detection from hand station signals; also the air duct smoke detectors should be monitored as an individual signal.

As noted in other paragraphs above, flow alarms should be separated as well as supervisory alarms.

As part of the compliance with NFPA 720 fire detector locations must meet the requirements of NFPA 72E - Standard on Automatic Fire Detectors. The following changes are required to plant detectors in order to meet minimum requirements of NFPA 72E:

a) Additional smoke detectors will be placed in the West and East 4160V Switchgear Rooms.

b) The smoke and heat detectors in the NSEB will be relocated to the ceiling in order to provide better alarm response times.

The following rooms are affected:

. East Switchgear Room 146

. West Switchgear Room 147

. East Electrical Room 234

. West Electrical Room 235

. East Mechanical Equipment Room 236

. West Mechanical Equipment Room 237

. East Computer Room 362

. West Computer Room 363 c) Additional detectors will also be provided in the rooms listed above to provide detector coverage in the bay areas above the half room ceilings. These areas are separated from the main portion of the room by 30-inch deep steel beams.

d) Relocate smoke detector in NSEB room 361 such that it is out of the supply air diffuser path.

7) Fire pump Controllers - The signals from the diesel and the electric fire pump controllers were reviewed to determine if they comply with NFPA 20. See Appendix B for the revisions recommended to these panels.

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i 2.0 EXISTING EQUIPMENT DISCUSS 10N

8) Detection panels - In general, retain or modify the existing .

detection panels. However, it is recommended that the Notifier-panels be replaced because of their age (spare parts and reliability problems). The Notifier equipment is located in' panel H-4FCP1 (19 active loops with 4 sparo loops) and panel H-4FCP2 (2 active loops with 12 spare loops). It is not recommended, at this time,.to replace the Pyrotronics high voltage' detection panels; rather, their replacement should be considered on an orderly, loop by loop basis, as the need arises. The new 72D system equipment can power low voltage smoke detectors directly from their detection loops,.thus, a separate panel (such as the-Pyrotronic ZIU-6 units) is not necessary when new detection loops are required or if an existing Pyrotronics loop is to be replaced with new low voltage detectors.

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3.0. NEW EQUIPMENT DISCUSSION 3.1 New Equipment Description A review of the signaling system data _ points at the Rancho Seco Nuclear Generating Stacion reveals that the new system should be capable of processing about 550 points. The-equipment selected as the design basis is the Honeywell Delta Net Plus Fire Alarm System. The Honeywell system provides for individually addressable initiating devices. At the present time, four manufacturers have UL listed systems which have addressable initiating device capabilities:

1) ADT 2)- Gamewell
3) Honeywell
4) Pyrotronics The Honeywell Delta Net Plus is a development of the Honeywell Delta 1000 system, which was introduced over 10 years ago. The Honeywell Delta 1000 equipment is installed at SCE's SONGS facility.

The equipment consists of the following components:

1) Operator Interface -

a) Color CRT with hard disk and diskette units, and operator keyboard (the unit is basically a modified PC).

b) Printers (2). One printer for system alarm recording and one printer for logging and system status reporting.

2) System Control -

a) Central Processing Unit (CPU) with its associated transmission line power supply.

3) Remote (Field) Panels -

a) The remotely located Data Gathering Panels (DGPs) interface with the existing panels and field devices in order to monitor their status.

The Honeywell equipment has the capability to be expanded to monitor a total of 6000 input points over ten communication ports or channels.

Each of the ten channels can be wired as a Class A (4-wire circuit) or a Class "B" (2-wire circuit). It is recommended that the communication channels be wired as Class A circuits. The interface between the DGPs and the existing panels and devices may be wired as a Class B circuit (most of the existing detection circuits are Class B circuits).

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3.0 NEW EQUIPMENT DISCUSS 10N j The system is 'a multiplexed system,-which means' that the field contact closure status collected by the DGPs are transmitted to the central location on either 2 or 4 wires. The_ system has the capability of addressable initiating devices; this capability allows individual hand stations, smoke detectors, switches, etc., which are on the same detection _ loop, to report as individual devices. Thus, the zoning of the devices can be accomplished in the CPU software, rather than by hard wiring on a zone by zone basis. This ability will allow future expansions and revisions to detection loops to be done with less conduit and wiring work.

3.2 Philosophy of System Design As noted in Paragraph 3.1, the system's communication channel can be wired as a Class A circuit (sometimes referred to as a Type I circuit) or as a Class B circuit (sometimes referred to as a Type 11 circuit)'.

Since mos.t of the existing detection equipment is wired as a 2-wire system, the recommended approach is to use a 2-wire system on the DGP initiation circuits. The communication channel (sometimes referred to as a data highway) from the DGP's to the CPU should be a 4-wire Class A circuit, since providing a redundant circuit for the data highway represents good practice. However, a 2-wire circuit for the data highway would satisfy the code.

Generally, the bulk of the existing detection and suppression panels can be monitored by the.new multiplexed system to provide the alarm and trouble status of the individual systems as required by NFPA 72D code.

However, it should be noted that the existing Pyrotronics high voltage local panels, Model ZIU-6 (with its associated power supply unit, Model FIU-6) were originally designed for NFPA 72A service; thus, these panels do not provide a trouble signal output for each of the four loops. The trouble signal originates at the power supply unit, and is common for all the zones powered by the FIU-6 unit. Providing a trouble signal on a per loop basis would require the removal of thc Pyrotronics panels and the replacement of the existing high voltage detectors. In either configuration (existing vs. replacement of Pyrotronics ZIV/FIU units),

the control room operator action would follow the same investigation sequence (i.e., looking at the indication lights on the local panels).

Thus, it is not recommended at this time to replace the high voltage Pyrotronics detection circuits.

As shown by Drawing 1, the proposed approach is to limit the number of inputs to a given channel to about 100 or less and to locate the DGP's such that the conduit and wire work is minimized. The drawing shows a block diagram arrangement for the system; it should be noted that the DGP's shown on tr.e block diagram represent DGP locations, since more than one DGP may be required at a specific location, depending on the manufacture of the ecpipment selected. In the case of Honeywell, the DGP is known as a Model FS90. The FS90 can monitor 54 contact closures or 27 contact closures if accessory relays are selected for each detection loop input. It is recommendM that the inputs be limited to 27 per FS90 so that accessory relays can be installed for future system changes (such as replacement of the Pyrotronics high voltage panels).

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3.0 NEW EQUIPMENT DISCUSSION As a general rule, it is recommended that a minimum of 10% active spares be provided at each DGP location, as well as allowing future expansion of the DGP by allowing space for additional plug-in detection board or modules. Thus, by the use of active spaces and future expansion space within the DGP enclosure, a total spare capacity of about 20% is recommended at each DGP location. Also, in areas outside or inside the turbine building, it is recommended that the DGPs be mounted within larger NEMA 4 enclosures. Whenever the NEMA 4 enclosures are used, it is further recommended that the NEMA 4 enclosure be sized such that an additional DGP can be mounted within the NEMA 4 enclosure at some future time.

3.3 Recommended Equipment Locations The location of the DGPs is based on the signals available at a gi/en location. The locations selected are as follows:

> Tag # > BLDG. > MUX-LOCATION > NOTES >

> DGP-1 > NSEB > 40' ELEV. - NEAR H-4FCPS > MONITOR H-4FCP5, >

> > > > H-4HCP88, 90, >

> > > > H-4CO276, 78, 79, 80 >

> DGP-2 > NSEB > O' ELEV. - NEAR H-4FCP10 > MONITOR H-4FCP10, >

> > > > H-4C0275, 77 >

> DGP-3 > 0.G. > O' ELEV. - NEAR H-4FCP6 > MONITOR H-4FCP6 >

> DGP-4 > AUX, > 20' ELEV. - ROOM c'08 > MONITOR H-4C0211, >

> > > VENTILATION > 12, 13, 16, 17, 19 >

> > > EQUIPMENT ROOM > >

> DGP-5 > AUX. > O' ELEV. - NEAR H-4FDC02 > MONITOR H-4C0214, >

> > >A-L > 15, 36, 37, 38, 39, >

> > > > 40, 41, H-4FOCO2A - C >

> DGP-6 > AUX. > 60' ELEV. - AUX. BLDG. > MONITOR CHARC0AL >

> > > ROOF > FILTER UNIT SF-A-7A/B >

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3.0 NEW EQUIPMENT DISCUSS 10N

> Tag # > BLOG. > MUX-LOCATION > NOTES >

> DGP-7 > AUX. > 20' ELEV. - NEAR H-4FCP2 > MONITOR H-4FCP2 & 8 >

> > > > AND CANAL STATION CO2 >

> DGP-8 > AUX. > 20' ELEV. - NEAR H-4 ARA /B > MONITOR VALVE >

> > > > POSITION SWITCHES, >

> > > > OTHER SUPERVISORY >

> > > > SIGNALS >

> DGP-9 > TURBINE > O' ELEV. - NORTHWEST > MONITOR DELUGE ZONES >

> > > CORNER > 31, 32, 35A/B >

> DGP-10 > TURBINE > O' ELEV. - NEAR H-4FCP1 > MONITOR ZONES 10, >

> > > > 22A/B, 23A, 33, 34, >

> > > > H4FCP3 >

> DGP-11 > TRANS. YARD > O' ELEV. - IN VALVE BLDG. > MONITOR ZONES 23B >

> > VLV. BLDG. >

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> THROUGH 30 >

> DGP-12 > TURBINE > 40' ELEV. - ON TURBINE > MONITOR H-4C0250-54 >

> > > DECK > >

> DGP-13 > IOS > 0' ELEV. - IN CONTROL ROOM > MONITOR ZONE 107, >

> > > NEAR H21F > 108 >

> DGP-14 > DIESEL FIRE > O' ELEV. - NEAR H4DF > MONITOR FIRE PUMPS >

> > PUMP ROOM > (CONTROLLER) > P-440 & P-996 >

> DGP-15 > ADMIN. > O' ELEV. - NEAR H-4FCP13 > MONITOR H-4FCP13 >

> DGP-16 > PAP > O' ELEV. - NEAR ALARM > MONITOR PAP, RCVG- >

> > > STATION > WHSE, TRAILER D >

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3.0 NEW EQUIPMENT DISCUSSION

> Tag # > BLOG. > MUX-LOCATION > NOTES >

> DGP-17 >T&R > O' ELEV. - CORRIDOR > MONITOR T & R BLDG. >

> DGP-18 > NEW ENGR'S > TO BE DETERMINED > TO MONITOR NEW .>

> > 0FFICE BLDG. > > 0FFICE BUILDING >

The new panels DGP-10 and DGP-11 are intended to replace the Notifier equipment now in panel H-4FCP1. New panel DGP-7 is intended to monitor the Pyrotronics equipment in panel H-4FCP2 and replace the Notifier equipment now in panel-H-4FCP2. DGP-7 would also be linked by dedicated telephone line to the canal station pump house. The new DGPs could be mounted within the enclosures now used for the Notifier equipment.

After review of available space at the generating station, it is recommended that the CAS be the central receiving station for the new system. This recommendation is based on the following factors:

1) The CAS is maned 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> / day.
2) The CAS has the available space for the opeVaEor terminal, printers, and CPU (the CPU can be located along the East wall of the CAS room).
3) The CAS has UPS power available.
4) The CAS has emergency lighting in the work area.

The plant's Control Room can receive selected priority alarms on the existing annunciators (H-3FPA and H-3FPB) and/or on IDADS. This option is recommended because of the limited space within the control room.

Since the CAS is the central receiving station, the non-UL listed control annunciators would be acceptable for this supplemental annunciation.

It should be noted that all the field devices now monitored by H-3FPA and H-3FPB will be monitored directly by the new 720 system. The existing annunciators will interface with the new 72D system by new software programmable relays located in an enclosure near the annunciator control cabinets H-4 ARA and H-4ARB. The existing annunciators will thus be monitoring relays which can be programmed to close on command from the fire alarm system's CPU. The existing annunciators H-3FPA and H-3FPB have a maximum display capacity of 196 windows. If more than 196 signals (out of a total of about 550) are selected as critical for plant operations then the additional signals could be placed on IDADS.

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4.0

SUMMARY

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4.1 Recommended Final Alarm System Configuration This report has:

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summarized deficiencies in-the existing plant fire alarm system described the current alarm system configuration proposed a new design configuration for the fire alarm' system in order.to meet the requirements of NFPA 72D The following list is a summary of the proposed changes:

1) Designate the plant Central Alarm Station (CAS) as the new fire alarm proprietary protective signalling system station for Rancho Seco and install a new CPU, printers, and data collection panel in the CAS for all plant fire alarm signals, supervisory alarm signals, and trouble signals. -
2) Install multiple Da5 Gathering Panels (DGP multiplex units) at various locations throughnut the plant to interface with the existing local fire alarm system equipment.
3) Install a four-wire data "highway" between the CAS fire alarm station and the DGP's which will monitor all Rancho Seco fire -

protection system alarms and parameters.

4) Reconfigure local alarm panels in order to' segregate alarm, supervisory. ar.d trouble signals into mecningful annunciation alarms which comply with the requirements of NFPA 720.

i 5) Instal: . new elay panel from the new NFPA 720 system which will sent priority alarms to the Control Room fi.e., fire  :

, alarm signals for safety related areas, cond'.tions which cause l Technical Specification inoperability, valve supervisory signals, etc.) These signals can be transmitted via the '

existing plant Enriunciator systems.  ;

6) Relocate and add fire detectors in various locations in the plant.

l The advantagos to installing the alarm system as described above are enumerated below.

This design does not require major changes of the plant 1 a l i slarm panels and does not delete a major portion of the existing equipment.

4-1 l

a d 4.0

SUMMARY

2) The amount of. newly added raceways will'not be as large as would be'requir6s.to provide a new hard-wired system and minimizes the amount of conduit nececsary200 upgrade co'NFPA 720 requirements.
3) The operators in the Control Room will still_ retain the ability.to monitor all "critical" alarms without receiving the secondary alarms which tend to distract the operators from their' primary purpose of operating the power generating portions of the facility.

4). The new CPU unit and DGD's are fully capalle of monitoring new

ow voltage detector loops and' can initiate suppression systems or auxiliary functions such that current local equipment (Pyrotronics) can be removed as it~becomes unserviceable or outdated. The new alarm equipment is even capable of.. interfacing with "intelligent" fire detectors which can be. tested and adjusted from the panel- (NOTE.- This design eight require a'second CPU for reliability purposes).

Additional CRT stations and printers can be added on as necessary (i.e., If the plant establishes a dedicated fire department, a screen ar,d printer could be set up at that location).

5) In the event that the new CPU unit or the data highway were to

. fail, firewatches can still be placed at the existing local panels'in order to continue monitoring-fire alarm system status without requiring institution of such watches in the affecteu plant zones.

6) Since all plant security guaros are trained fire brigade members and carry hand-helt walkie talkies, the CAS could immediately send a guard to verify alarm conditions while the fire brigade is assembling.

4.2 Other Design Options l

The following options are potential variations from the proposed ds_ign which could be considered but are not as desirable, i

1) Retain the Control Rooo as the fire alarm proprietary protection i

s'gnalling system station. This would require placing the CPU, printers, and data collection panels in the Control Room which is very li.wited on space. The existing fire annunciacion in the

Control Room would then be abandored.

4 4-2

I 4.0 3UMMARY

2) Use the TSC as'the fire alarm protective signalling system station and place the CPU, printers, and data collection panels in the TSC. This would require a 24-hour dedicated operator (and replacement for breaks during shift coverage) to monitor the fire panel as well as dedicated means of conniunication to the SS or SRO, or a second CRT and printer.in the Control Room. Again, the existing fire annunciation would be abandoned.-

NOTE: 0ption 1 or 2 may be required if the number of priority ,

alarms exceeds the capability of the current annunciator windows (H-3FPA and H-3FPB) or that of the IDADs fire points. Retaining both systems is confusing and.is not recommendad unless a clean break can.be maintained such as to display all safety related zone ,

fire and trouble signals on the annunciator windows and all valve position alarms on IDADs.

t l

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t h

4-3 i

5.0 REFERENCES

5.1 ERPT-M0033 -

NFPA Code Verification, NFPA 720 - 1967 and 1979, Proprietary Protective Signalling Systems 5.2 LER 87-29, June 15, 1987, Discrepancies with Rancho Seco Fire Protection Systec's Against NFPA Codes 5.3 ERPT M-0072, Response to LER 87-29, Rev. A, Oct. 1987 5.4 National Fire Protection Association, NFPA 720, 1967 and 1979 editions, Standard on the Installation, Maintenance, and Use of Proprietary Protective Sign:lling Systems 5.5 National Fire Protection Association, NFPA 72E,1982 and 1987 editions, Stardard on Automatic Fire Detectors 5.6 Branch Technical Position (BTP) APCSB 9.5-1, Nuclear Regulatary Commission, May 1, 1976 5.7 Generic Letter 86-10, implementation of Fire Protection Requirements, Nuclear Pegulatory Commission, Anril 24, 1986 Appendix R Quest'ons ar.d Answers, Section 3.8 and 8.9 5.8 SMUD Drawing M-308. 309, 310 and 311, Fire Protection General Arrangement 5.9 National Fire Protection Association, NFPA 20, Standard for the Installation of Centrifugal Fire Pumps l

5-1

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