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ASTM C1309-97(2021)
Standard Practice for Performance Evaluation of In-Plant Walk-Through Metal Detectors (Withdrawn 2023)
NORMA vydaná dňa 1.1.2021
Informácie o norme:
Označenie normy: ASTM C1309-97(2021)
Poznámka: NEPLATNÁ
Dátum vydania normy: 1.1.2021
Kód tovaru: NS-1018217
Počet strán: 16
Približná hmotnosť: 48 g (0.11 libier)
Krajina: Americká technická norma
Kategória: Technické normy ASTM
Kategórie - podobné normy:
Anotácia textu normy ASTM C1309-97(2021) :
Keywords:
ICS Number Code 13.320 (Alarm and warning systems),27.120.20 (Nuclear power plants. Safety)
Doplňujúce informácie
| Significance and Use | ||||||||
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7.1?Walk-through metal detectors are an effective and unobtrusive means for searching for concealed metallic weapons and SNM (special nuclear material) shielding material. The detectors are generally applied to prevent the unauthorized entry of weapons into facilities, and theft or unauthorized removal of SNM. Daily functional testing of metal detectors shows that they are operating and will produce the correct alarm signal; the significant use of less frequent in-plant evaluations provides data from which to determine if detectors are operating at expected performance levels. 7.2?This practice provides a system of procedures for evaluating the detection performance of walk-through metal detectors. 7.3?The procedures specify data to be recorded and used for establishing, tracking, and auditing metal detector performance and operation. 7.4?This practice suggests documentation for maintaining performance records. Appendix X4 provides examples of forms for recording and tracking detector operation and performance testing. |
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| 1. Scope | ||||||||
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1.1?This practice is one of several (see Appendix X1) developed to assist operators of nuclear facilities with meeting the metal detection performance requirements set by regulatory authorities. 1.2?This practice consists of four procedures useful for evaluating the in-plant performance of walk-through metal detectors (see Fig. 1). FIG. 1?Walk-through Metal Detector Evaluation Testing Program Note 1:?The number of detection sensitivity verification tests
in a series, the number of passes per test, the acceptance
criteria, and the frequency may be established by regulatory
authority or set by the security organization based on threat
scenarios or vulnerability assessments; the numbers should be
sufficient to provide a degree of assurance commensurate with the
detector application.
Note 2:?If the detector fails to meet the acceptance criteria,
the verification series is terminated. The detector then must be
tested to reestablish the probability of detection. If the
probability of detection requirement cannot be met (repairs may be
necessary), the detector must be mapped and the operational
sensitivity setting reestablished. Performance testing can then be
resumed starting with a new detection sensitivity test.
Note 3:?If the detector fails the functional test, the
detector must be immediately removed from service (see Appendix X1).
1.2.1?Two of the procedures provide data for evaluating probability of detection. These procedures use binomial data (alarm/not alarm). 1.2.1.1?The detection sensitivity test (DST; see Note 1) is the initial procedure in the detection probability evaluation series. It is used to establish the probability of detection immediately after the detector has been adjusted to its operational sensitivity setting. Note 1:?The DST is one of two procedures used to evaluate
detection rate. The Detection Sensitivity Verification Test (DSVT)
is the other. In the evaluation test strategy, the DST is used to
initially determine and document the detection rate and then the
DSVT is used to periodically check that the detection rate
continues to meet the requirements.
1.2.1.2?The detection sensitivity verification test (DSVT; see Note 1) procedure periodically provides data for evaluation of continuing detection performance. 1.2.2?The third procedure is a functional test. It is used routinely to verify that a metal detector is operating and responds with the correct audio and visual signals when subjected to a condition that should cause an alarm. 1.2.3?The fourth procedure is used to verify that alarms generated during detection sensitivity testing were likely the result of the detection of metal and not caused by outside interferences or the perturbation of the detection field by the tester's body mass. 1.2.3.1?This procedure also can be used to establish a probability of occurrence for false alarms, for example, 20 test passes by a clean-tester resulting in no alarms indicates a false alarm probability of less than 0.15 at 95 % confidence. This procedure is optional unless required by the regulatory authority. 1.3?This practice does not set test object specifications. The specifications should be issued by the regulatory authority. 1.4?This practice is intended neither to set performance levels nor to limit or constrain technologies. 1.5?This practice does not address safety or operational issues associated with the use of walk-through metal detectors. 1.6?This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee. |
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| 2. Referenced Documents | ||||||||
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