ML19221B330

Reg Guide 5.44,Revision 1, Perimeter Intrusion Alarm Systems

ML19221B330
Person / Time
Issue date:	06/30/1976
From:	NRC OFFICE OF STANDARDS DEVELOPMENT
To:
References
REGGD-05.044, REGGD-5.044, NUDOCS 7907200047
Download: ML19221B330 (7)

Text

Revision 1 U.S. NUCLEAR REGULATORY COMMISSION June 1976 REGULATORYGU DE OFFICE OF STANDARDS DEVELOPMENT REGULATORY GdDE 5.44 PERIMETER INTRUSION ALARM SYSTEMS A. INTRODUCTION The mode of installation of the perimeter alarm system influences its effectiveness. In general, dividing Paragraph 73.50(b)(4) of 10 CFR Part 73," Physical the site perimeter into segments that are independently Protection of Plants and Materials," requires at fuel alarmed and uniquelv monitored assists the security reprocessing plants and certain other plants at which organization responotng to an alarm by locahnng the high enriched uranium, uranium-233, or plutonium is area in which the alarm initiated. Segmenting of the used or processed that the isclation zone surrounding perimeter alarm system also allows testing and mainte-the physical barrier at the perimeter of th orotected nance of a portion of the system while maintaining the area be monitored to detect the f.esence ofindviduals remainder of the perimeter under monitoring. It is or vehicles within the zone so as to allow response by generally desirable that the individual segments be armed members of the licensee security urganization to limited to a length which allows observation of the be initiated at the tim: of penetration of the protected entire segment by an individual standing at one end of area.* This guide describes six types of perimeter the segnent.

intrusion alarm systems and sets forth criteria for their performance and use as a means acceptable to the NRC Effective use of a perimeter intrusion alarm system is staff for meeting specified portions of the Commission's facilitated by a regular program of system testing.

regulations.

Testing for operability can be performed by a guard or watchman penetrating the zone protected by the alarm system during routine patrols. Functional performance B. DISCUSSION testing, however, usually is more elaborate. In any case, Perimeter intrusion alarm systems can be used to testing can be meaningful without compromising detect intrusion into or through the isolation zone at the security only if performed under controlled circum-perimeter of the protected area. A system generally stances, such as direct visual observation of the area consists of one or more sensors, electronic processing being tested while a rpecified test is conducted.

]equiprrwnt, a power supply, signal lines, and an alarm monitor. Detection of an intruder is accomplished by the alarm system responding to some change in its To ensure normal operation. the system may periodi-operating condition caused by the intruder, e.g., inter-cally monitor the sensor transducer and signal processing ruption of a transmitted infrared or microwave beam or circuits. Tais self. checking feature can vary depending stress exerted on a piezoelectric crystal. The choice of a on the type and design of the alarm system. Many perimeter alarm system is influenced by considerations systems require self-excitation of the sensor transducer of terrain and climate. At present, no single perimeter (e.g., vibration, strain, pressure) while others monitor a

intrusion alarm system is capable of operating effectively the signal leve! at the receiving transducer (e.g., micro-e in all varieties of environment.

wave, infrared). Howeser, several worthwhile commer-O cially available perimeter alarm systems provide littb or

• f ragraph (bX3) of proposed rv'e 73.55, " Requirements of no self-checking circuitry. To ensure normal operation licensed activities in nuclear po ver reactors against industrial for those alarm systems that do not incorporate self-g sabotge," will have similar requirements to morutor the checkin8 circuitry, the licensee may institute a test isolation zone around the physical barrier at the perimeter of

%e the protected area and any part of a building used as parf of Program that will periodically test each zone of a that physical barner.

perimeter alarm system to verify that it maintair.s the

' Lines indicate substantive changes from previous issue.

proper sensitivity to detection.

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The following discussion desenbes the operations, are recommended in order to have ef fective alarm '~

hautations, and environmental considerations of six response capabthties. The system can be mounted on basic types of com.mercially available penmeter alarm metal, plastic, or wooden posts using specully deugned systems: nuerowave, E-field, ferrous metal detector, electrical isolators that allow for small n.csements of the pressure-sensitive, infrared, and vibration or stress-fence posts without disturbmg the field and sensing wires.

protection systems.

Both the field and sensmg wues need to be under a high degree of spring tension so as to produce high-frequency

1. Micronve Perimeter Alarm System vibrations when they are struck by small foreign objects or blown by the wind, both of which are out of the Each Imk of a microwave perimeter alarm system is passband of the receiving cucuitry. In addition,in order composed of a transmitter, receiver, power supply, signal to keep the sensitmty of the system from varying, the p:ocessing urut, signal transmission system, and annun.

E-field detector needs to be well grounded.

ciater. The nucrowave transmitter produces a beam-like pattern of microwave energy directed to the receiver The E-field detector is not a hne-of-sight sy stem and which unses the microwave beam. A partial or total theufore can be installed on unesen terrain and in an interrupticu of the beam will cause an alarm condition.

inegular line. The sunounding terrair should be kept The nucrowave beam can be modulated to reduce clear of sluubs, tree hmbs, and undergrowth smce they interferae from spurious sources of radiofrequency act as moving grounded objects. The basic system is a energy to increase sensitivity, and to decrease the two-wne system with the sensmg wue located between vulnerability to defeat from " capture" of the rt;civer by 200 and 450 nulhmeters 6ove the ground and the field a false microwave source-wue located approximately I meter abuse and parallel to the sensmg ware. The width of the detection zone is Successive microwa'e links can be overlapped to form vanable and depends to a inge degree en the size of the a protective perimeter around a facility. Since the target. Generally, it is approxmutely 0 6 meter wide on transmitter / receiver link is a line-of-sight system, hills or either side of the field wue. To present an mtruder from other obstructions wdl interrupt the beam, and ditches jumping oser the top of the E-tield detector, a second or valleys may provide crawl space for an intruder.

sensing wire can be installed approximately I meter Moreover, objects such as tumbleweed, paper, and above the field wue. When installed on a chain hnk bushes moving in the path of tne beam can cause fence, standoffs approximately 1/2 meter long are uxd nuisance alarms. Systems using the Doppler shift for for mounting the wues. The E-field generated in this motion detection are especially sensitive to the motior configuration does not penetrate the fence but parallels of trees and grau and to falhng rain and snow.

it.

The maximum and minimum sep. ration of the transmitter and receiver usually is specified by the

3. Ferrous Metal Detector Perimeter Alarm System manufacturer. Typically, a microwave penmeter alarm eystem will operate effectively in the range between 70 and 150 meters.

A ferrous metal detector system consists of buried electrical cabies, amphfiers, mhibitors, power supply,

2. E FHd Perimeter Alarm System signal processing unit, signal transmission bnes, and annunciator. The system is passive and is susceptible to An E-field perimeter ha system consists basically changes in the earth's ambient magnetic field. Such of a field generator wuich excites a field wire one or changes are caused either by electromagnet 2c disturh-more sensing wues, and a sensmg filter, an amplifier, and ances such as lightning or by ferrous metal being canied a disennunatory and annunciator unit. The field wire over the buried cables. The change in the local Ambient transmits essentially an omnidirectional E-field to magnetic field induces a current m the buned cable ground. A large body anproaching the system changes which is filtered and sensed by the electronics. If the the pattern of this E-field. When sensing wires are placed change exceeds a predetennined threshold, an alarm is at different locations within the transmitted E-field generated. To reduce nuisance alarms from external pattern. they pick ap any changes occurring in that electromagnetic sources (e g., electncal power trans-pattern. If the changn are withm the bandpass of human mission lines), the electrical cable u laid in loeps which movement. an alum signal is generated. The field w e are uansposed at regular intervals. Also, an inhibitor and one or,more parallel sensmg wires can be either loop can be used to reduce nuisance alarms from connected to chain Imk fence or mounted as an electromagnetic interference. The inhibitor, which op-above-ground free standmg system in the center cf an crates on the same pnnciple as the sensor cable loops isolation one and is buried near the cable sensur, senses strong temporary electromagnetic interference (ep., hghtning)

I'he E-held system can off er about 300 meters of and disables the alarm system for approximately one penneter protection, but shorter lengths of 100 meters second, thus reducing nuisante alarms.

5.442

V The t rrous metal J temt s> stem is not a hne.of-ciator. The transmitter duects a narrow infrared beam to l cht sys'em and thcicf ue tan N mstalled on unesen a receiver if the infrared beam between the transmitter ground m an uregu!ar hne The sensor subloers formed and receiser is mtc rupted, an alarm signal is generated.

by the cables must bc f an!y regular, however Sinse the As with the microwave system, the infrared system is sprem will only detect fenous metal, amaals, buds, or

ine o f-sigh t. In addition, the infrared beam is usually fh m leaves will not initiate alamis. Iloweser, electro-modulated Since the mfrared beam does not diverge ma stN mterferenco can cause n um n ce alarms or sigmficantly as does the nuerowa ve beam, multiple disaNe the alarm system when the mterference is sesere.

mirared beams between transnutter and receiver can be used to denne a "waP 'If this " wall"is then penetrated I ach sensmg cable (and amphfier) can monitor a by an mdmdual, an alarm will result.

' secunty mne up to 500 meters m length. In:reasing the Fog both attenuates and di.;perses the infrared beam l length of the secunty mne beyond 500 meters usually results in a high nmsance alarm rate Multiple cables and and can cause nuisance alarms. Ilowever, the system can amphUers can be used to extend the momtonnglength.

be designed to operate properly with severe atmosphene attenuation. Dust on the faceplates also will attenuate 4 Pressure Strain-Sensithe Perimeter Alarm Sy stem the mirared beam as wdl an,ccumulation of condensa-tion, frost, or ice on the faceplates.

Bumd pressureistram tresducers detect small vana-tmns in the mechanical stren exerted upon the sur-Like the microwave system, vegetation such as roundmg ad by th presence of an indmdual passmg bushes. trees, or grass and accumulated snow will abow the sensor. The signals produced by the trans-interfere with the infrared beam, and ditches, gullies, or ducers ne amphfie d and compared with

't pre-lulls will a%w ateas where the passage of an intruder estabbst ed threshoid. If the signal exceeds the threshold, may go undetected.

an alar;n occu rs. The transducer may be a se t of The typcal distance between transmitter and receis -r a fluid-filled Deuble tube, a p e me'ec t ne c ry s tals,

. specia ly fabncated stress /stram clectneal cable, or an is about 100 meters; some systems are capable of I msul: ted ware m a netalhc tube.

momtoring a distance up to 300 meters under ideal con ditions.

Se the furnus metal detector system, the pressure-se aitt e system does not equue hne-of-sight m>tallation 9

a d can be sited on unev n terram. Iloweser, mstallation

6. Vibration or Strain Detector Perimeter Alarm System I

rocky soil may result in damage to the pressure

.i aansducers either during installation or as a result of soil A sanety of devices that detect strain or ut iton settlement af ter installation.11 gh winds can produce are avadable for use as fence protection sy stems.

pressure waves on the ground surface which,if sensed by Although the devices vary greatly in design, each the transducer, could necessitate operanon at reduced basically detects stratn or vibration of the fence such.u sensitmty m order to asoid nuisance alarms; however, that produced by an intruder climbing or cuttmg the features to compensate for wmdgnerated noise can be fence. In the simplest devices, the vibration or strain l destped into the equipment but m turn may cause a makes or breaks electrical continuity sad thereby i decrease in system sensitivity. Pressure systems willlose generates an alarm. \\ibration-or stratn-detection desices sensitmty when the buned sensors are covered by snow-for fence protection generally are susceptible to uisance oy snow with a frozen crust which will support the alarms caused by wind vibrating the fence or by hail weight of a man, or by fro 7en pound. Other natural stones or large pieces of trash blowing against the fence.

phenomena such as had and ram m.

mse nuisance The frequency of nuisance alarms due to the wind can alarmt be reduced by rigidly mounting the fence and thereby lessening the prnpensity of the fence to sibrate in the The se n siuve area consists of a nanow corndor, aind. This situation is especially common with post-usually about one meter in width. A peater depee of sounted switch-contact type alarm systems. lhe use of se cun ty can be ac hie ve d by employmg two such

,,ctronic signal processing equipment in conjunction corndors to prevent an mtruder from jumping over the h signal-generating stram transducers csn effectively s

buned transducers. A typical length monitored by a aduce nuisance alarm rates without sacrificing sensi-transduur (i.e. se t uf piczoelectrw crystals, a bquid-tivity to chmbing or cuttmg of the fence. liawever, most titled tube, or an electncal cable)is about 100 meters.

fence alarm systems can be easily bypassed by a variety of methods.

5. Infrared Perimeter Alarm Sy stem Uke the mwrowave system, each hnk of an infnaed Dependmg upon the variety of sensor, each sensor system is compmed of a transmitter. rc<eiver, power can monitor a length of fence ranging from about une g'O

! supply, sipal processor, signi! haes, and alarm annun-meter to several hundred meters.

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5.44-3

I C. REGULATORY POSITION Use of Locks in the Protection of Facilities and Special Nuclear Material").

1. Minimum Qualification for Perimeter Intrusion Alarm Systems (3) Environment. Perimeter intrusion alarm sys-tems should be capable of operating throughout the

a. General chmatic extreme of the envuons in which they are used, as a minimum, the systems should be capable of (1) E L..

All compo~ e nts-sensors, electroruc effective operation between -35 and +50 C. Compo-processmg equipe ent, power zupplies, alarm monitors-nents which necessanly must be located out of doors should meet the requirements of Underwnters Labora-should be protected from moisture damage by such tury (UL) for fire safety. The system should contain methods as hermetic sealing or putting in an epoxy provisions for automatic switchover to emergency bat-compound.

tery and generator or emergency battery power without causmg an alarm in :he evert primary power is inter.

(4) Alarm Conditions. Perimeter intrusion alarm rupted. Er rgency power should be capable of sus-systems should generate an alarm under any of the taining operation for a minimum of 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> without following conditions:

replacing or recharging batteries or refueling generators.

If sufficient battery or fuel capacity is not attainable for (a) Detection of stimulus or a condition for 24-hour operation as stated above, additional batteries which the system was designed to react, or fuel should be stored on site expressly f or augmentmg the emergency pose.r supply, if emergency power is (b) Failure of emergency power to properly furmshed by battery, all batteries (includmg stored operate the system in the event of loss of primary battenes) should be maintamed at full charge by powe r, automatic battery-charging circuitry. Batteries should be checked daily in accordance with manufacturers'instruc-(c) Indication of tampenng (e.g., opening, tions to ensure that available capacity is not less than shorting, or grounding of the sensor circuitry) which 8M of rated capacity.

renders the device incapable of rormal operation, (2) Tamper Indication. All enclosure., for equi -

(d) li.dicatioa of tampering by activation of a P

th tamper switches or tamper switch or otner triggering mechanism, ment should be equiptv v

taggering mechanisms.. guble with the alarm sys-m T5 electronics should be designed sa that (e) Failure or aging of any component (s) to the t yr indicating oevices re main in operation even extent that the device is rendered incapable of normal the system itself may be placed in the ACCESS operat:en. Self-checkmg circuitry is normally used for detecting components that have aged or fatled in a device.

All controls that affect the sensitmty of the alarm system should be located within a tamper-resistant Under normal environment I conditions, perim-enclosure. All siznal lines connecting alarm relays with alarm monito s s'hould be supervised, if the processing eter alarm systems should not average more than one false alarm per week per zone and should not average electrorncs is separated from the sensor elements and no, more than one nuisance afarm per week per zone while located within the detection area of the sensor elements.

maintairing preper detection sensitisity.Where the zone the signal lines linking the sensors to the processin) is under continuous visual observation, the false alarm electronics shculd also be supervised.b rate and nuisance alarm rate may be increased to one alarm per day per zone. Fulse akrms are defined as those All key locks or key operated switches used tc which have been generated wnhout any apparei.

protect equipment and controls should have UL hster Nuisance alarms are defm~ ed as those alarms lockmg cylinders (see Regulatory Guide 5.12 " Genera-generated by the alarm system detecting a change in the operating envuonment. Proper detection sensitivity is deEred as the ability to detect an intruder in the secured

' ACCESS mode means the cond2 tion that mamtams secur ty zone ninety-five out of one hundred times urder the over the sgnal hnes between the detector and annuncutor ni conditions stated in the Performance Chteria of each over the tamper switch in the detector but allows access int of h y h '

the protected area s,thout generating an alarm.

Signal hne supervision will be discuswd in a regulatory guide An automatic and distinctly recognizable indi b

curre n tly under development on in tenor intrunon alar n cation should be generated by the alarm monitor upon systems. Reference should be mfe to the Intenm Federal swachover to emergency power, if primary power is Specification W-A-00450B (GS A4 SS) F eb ruary 16. 1973, supplied from the central alarm station.

paragraph 3.5.

157 004

Loss or reduction of power (either primary or nses or depressions of height or depth greater than 15 emergency) to the degree that the system is no loneer cm. The clear area should be sufticientiv wide to operating properly should result in an alarm condition or preclude generation of alarms by objects moving near be otherwise indicated m the central alarm station.

the nuerowaw link (e g., personnel walking 0; vehicular traffic). Approximate widths of the microwase pattem Placement of any portion of a penmeter intru.

should be provided by the manufacturer. If the micro-sion alarm system into the access mode should be wave Imk is installed inside and roughly parallel to a indicated automatically and distinctly by the alarm perimeter fence or wall, the transmitter acid receiver monitor. Moreover, the segment (s) of the sy stem placed should be positioned so as to prevent someone from m the access mode should be mdicated clearly.

jumping over the microwave beam mto the protected a ca from atop the fence or wall. Typically, a chain link (5) Innallatwn. Penn.eter intrusion alarm systems security fence with an averall height of 2.4 meters will generally may be located on either side of the perimeter necessitate a mmimum of 2 meters between fence and physical barner. If, however, mstallation is outside the the center of the microwave beam.

perimeter barner, a second barner or a fcnce (e.g., a cattle or snow fence) should be erected so that the alarm Successive microwave links and corners should system is located between the barners. The second overlap at least 3 meters to ehminate the dead spot barner or fence will serve to educe the incidence of (areas where movement is not detected) below and nuisance alarms from animals and passersby. The second immediately in front of transnutter and receis ers. ~ihe barrier should be separated a trunimum of 10 meters overlap of successive links should be arranged 30 that from the inner fence to prevent bridging of the receiver umts are within the area protected by the perime te r slarm sy s te m.

Fence protection systems micro ave beam.

should be located or an inner fence.

Where possible, the perimeter should be seg-

c. E-Field Perimeter Alarm System mented so that an individual standmg at one end of a (1) Pap nnance Cnrena. An E-field penmeter segment will have a clear view of the entire segment. In no case should any segment exceed 200 meters in length, alarm system should be able to detect an mdmdual Each segment should independently and uniquely indi-weighmg a mini um f 35 kilograms crawhng and

~

b cate mtrusien and should be capable of placement into r lhng undr the lower sensmg wire, stepping and the access mode independently of the other segments.

Jumping betw een the tie!d and sensm wires, and jumping over the top sensing wue of the system. The field and se es should be supervised to present

b. Micronve Perimeter Alarm System the cuttm; o> passing of the system through elec-(1) Performance Criteria. A microwave perimeter tronic or clandestme means. The system design should alarm system should be capable of detecting an intruder ernpl y techmques to elimmate alarms caused by high w'inds and small animals.

l passing betwecn the transmitter and receiver at a r2te between 0.15 and 5 meters per second,whether walking, (2) Innallati n Cnteria. The E field sensor should running, jumping, crawling, or rolhng. The beam should be modulated, and the receiver should be f equency c nsist of a minimum of one field wire and two sensing selective to decrease susceptibility to receiver " capture."

wires. One sensing wire should be located no more than Generally, because of susceptibility to motion beyond 0 45 meter above ground level with the second located the area to be protected, Doppler microwave systems approximately 2.6 meters abose ground level. The field should not be used as perimeter intrusion alarms.

should be located between the sensmg wues approe imately 1 meter above ground level. The surroundmg (2) Instdlation Cntena. The transmitters and re-terrain should be free of all shrubs, trees, and under-ceivers should be installed on even terrain clear of trees, gr wth. The control unit should be well grounded using a bmete or longer groundmg rod or equivalent elec-tall grass, and bushes. Each unit should be mounted rigid!f at a distance of about I meter above the ground.

nical grr und. When mounted to a cham link fence, the Due to variances in the antenna pattern of different fence i uld also be well grounded approximately every 23 me.ers, usin-I-meter or longer groundmg rod or microwave systems, this height may have to be varied slightly in order to obtain proper ground coverage. The equ valent elec al ground.

distance between a transmitter and its receiver should be at least 50 meters. Neither the transmitter nor the J. Ferrous Metal Detector Perimeter Alarm System receiver should be mounted on a fence. To prevent passage under the microwave beam in the shadow of an

(!) Performance Oitena. A ferrous rnetal detector obstruction, hills should be leveled, ditches filled, and perimeter alarm system should be able to detect a 400-obstructions removed so that the area between trans.

Pole-centimete (CGS units) magnet moving at a rate of mitter and receiver is clear of abstructions and free of 0.15 meter per second within a radius of 0.3 meter of a 157 005 5.44-5

u sensor cable. The detectan sgtem should be equ:pped

( 2) Installarmn Cn tena. The sensors should be with trJubitor cods to mmimize ntisance alarms due to installed at the depth below the gmund surface stated by electromagnetic mterference. No more than six sensmg the manufacturer. To oStam a h:gh probability of

' loops pc-inhibitor cod should be used in order to detection, the sensms should be in two separate parallel prevent simultaneous decensittang of the entire system.

hnes at a distance of 1.5 to J metets apart. The sensors and electronic circuitry buned in the grounG Sould be (2) Ir+ "rtun Ch tena. To dete rmme if the cf a durable, meistureproof, redent-resistant matenal.

Men a presme ensinve penmeter alarm system is ferrous r tection system will operate in the bemg installed m rocky soil, all rocks should be removed pro pose :

'reengineering site survey should u nu electromagnetic detection during backfilhng to present damage to sensors. If the fmst hne euceds 10 cm, a buned pressure-sensitive survey meter. This s.

ter can be furnished by the manufacturer if the el'ectromagnetic disturbances are system should not be used unless the soil is specifically prepared to chminate freezing above the sensor.

within the hmits presenbed by the manufactu er, this type of system can be used effectively. Speciallooping configurations can be made in areas of high electro-

f. Infrared Perimeter Alarm Systems magnetic interference to reduce the incidence of nui-sance alarms (1) Paformance Critena An infrared perimeter The sensing loops of electrical cable should be alarm system should be a multibeam me.dulated type buried in the ground according to the manufacturer's consisting of a minimum of three transmitters arid th:ee stated depth. Multiple umts(cable and amplifier) should receivers per umt. An infrared perimeter alarm system be used to protect a penmeter. All associated buried should be capable of deteetmg an indmdual passing cucuitry should be buned withm the protected zone and between the transnutters and receners at a rate between packaged in hermetically sealed containers. The cable 0.15 and 5 meters per second, whether walkmg, running,

~

should be laid in accordance with the manufacturer's Jumpmg, crawling, ar rolling. Furthermore, the systems recommended ectatncal confieurations to reduce rui.

should be able to operate as above wuh a factor of 20 sance alarms fr'om external sources. When cable is being (13db) msertion loss due to atmo:pheric attenuat:on installed m rocky sod, care should be taken to remove (e g., fog) at maximum range (100 treters).

sharp rocks dunng backfi!!mg ever the cable.

(2) Installarian (h tena. An infrared perimeter Inhibitors should be buried in the nound at alum system should be installed so that, at any point,

! east 6 meters from the cable mside the ' protected the lowest beam is no higner than 21 cm above grade.

pe rime te r.

Re transtmt ters and re ceive rs shou!d be Contmuous electromape tic in te rference ob-mounted rigidly (e p.,

insta!!ed on a rigid post or structs the detection of an mtruder carrying metal over concrete pad) to prevent nuisance alarms from vibra-the buned cable hv keepmg the mhibitor activated, tions. Each transmitter and receiver post should be thereby presentmg the alarm umt from respondmg to a provided with a pressure-sensitive cap to prevent scahng change m tlux caused by the intruder. The device should of or vaultmg mer the irifrared be am post 1 he therefore be use d only w here the enuronment is maumum distance between transmitter and receiver relatively free of severc man made electromunene mter-should be selected to permit propei operation dunng ference te g, overhead power cables, puie meunted conditions of severe atmosphenc attenuation that are transformers. generators, eic.). ne cable suuld never tyWcal for the site, general ly a n '

"m of 100 meters.

be mstalled close to userhead power transtnission hnes Moreuer, the cable should be placed at leasi 3 meters It is recommended that the mfrared penmeter from panuel runmng metil fences and at least 20 meters alarm ssstem be installed outside and parallel to an outer from pubac road 3 to nummize nuisance alarms.

fence or wall with the transnutter and receiver uruts podtioned greater than 3 m-ters ! rom the barrier. If it is

e. Freuure-Seathe Perimeter Alarm System desired to reduce ra:sance alarms caused by stray animals, blowing trash, or the general public, thel the

!1) Performance Oiteria. A pres ~ Esensitive mfrued penmetei alarm system may be placed.nstJe wnmeter alarm system should be capable of detect: 11, the outer fence. However, the transmitter and receiver an indoidual weighing more than 35 kdograms crossmg umts should be positioned between 2.0 and 2.5 meters j the sensitive area of the system at a minimum speed of from the fence to prevent an individual from jumping

) 0.15 meters per second, whether walking. crawhng, or over the infrared beams from atop the fence or sprmting rolhng. The sy stem design should employ techniques througn the beams. Installation of the infrared alarm (e g., electrome sipal processmg) to ehminate nuisance system mside the penmeter and adjacent to an outer alarms from wmd.

wall should be avoided smee the wall proudes a sohd 5.44 s r-

)[

b

9 base from which an intruder can jump over the beams which the system is attached. Where appropriate, a into the protected area.

specific test procedure should be followed. Prior to making the test, the individual makmg the test should

g. Vibration or Strain Detection notify the central alarm station that a test is about to be conducted. The area under test should be maintained (1) Perforunce mtcria. Vibration-or strain-

.inder sisual observation by a member of the security de tec tion systems used for fence protection should organization.

detect an intn. der weighing more than 35 kilograms attemptmg to,.hmb the fence. The system should also

b. Specification Testing detect any attempt to cut the fence or hft the fence more than 15 cm above grade. The system should not At least quarterly, the perimeter intrusion alarm generate alar:ns due to wind vibration of the fence from system should be tested against its manufacturer's design a wmd force of up to 4r kilome:ers/heur.

specifications. The test proce l re recommended by the manufacturer should be followed. While the test is being The fence alarm system should only be used as conducted, the area under test should be maintained 4 secondary or backup penmeter alarm system except under direct visual observation by a member of the when one of the other five types of perimeter alarm security organization. For all perimeter systems, tests systems will not work te.g. because of the environment) should be conducted to verify that no obvious dead and af ter the Commission's approval has been received.

spots exist in the zone of protection.

(2) mtallation Gteria. The vibration or strain sensors should be attached firmly to the fence (post or D. IMPLEMENTATION fabne, as appropriate) such that the vibration / stress caused by an intruder climbing, cutting, or lifting the The purpose of this section is to provide information fence will generate an alarm.

to applicants and licensees regarding the NRC staft's plans for unng this regulatory guide.

2. Testing of Perimeter Intrusion Alarm Systems Except in those cases in which the applicant or y;

a. Performare Testing licensee proposes an acceptable alterrative method, the staff will use the methods desenbed herein in evaluating Perimeter intrusion alarm sys' ems shouhi be tested aa applicant's or licensee's capability for and perfor-at least once each 7 days. Testing may be accomplished mance in complying with specified portions of the during routme patrols by th: men bers of t'ae licensee Commission's regulations after December 1,19%

l security f rce. The alarm systems shouM be tested in 9

segments at candom with only one or two segments if an applicant or licensee wishes to use the method tested per patrol. Ilowever, every segment should be descnbed in this regulatory guide on or before December tested at least once every 7 daye. The testing should be 1,1976, the pertinent portions of the application or the conducted by crossing the L.olat;on zone where the licensee's performance will be evaluated on the basis of alarm system is located 0: by climbing the fence to this guide.

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