GB/T 11807-2021Characteristics, design and operational procedures for acoustic monitoring systems of loose parts detection important to safety in nuclear power plants (English PDF)

foreword

This document is in accordance with the provisions of GB/T 1:1-2020 "Guidelines for Standardization Work Part 1: Structure and Drafting Rules of Standardization Documents"

drafted:

This document replaces GB/T 11807-2008 "Characteristics, Design and Operational Procedures for Acoustic Monitoring Systems for Detecting Loose Parts", and

Compared with GB/T 11807-2008, in addition to structural adjustment and editorial changes, the main technical changes are as follows:

--- Modified the scope of the standard (see Chapter 1, Chapter 2 of the:2008 edition);

--- Added normative references (see Chapter 2);

--- Added the terms "alarm monitor", "monitoring signal", "known event" and their definitions (see 3:11, 3:12, 3:13);

--- Delete the terms "monitoring area", "foreign object", "frequency distribution of burst wave interval", "frequency distribution of burst wave amplitude", "system spirit"

"Sensitivity" "passband" and its definition (see 2:1, 2:2:3, 2:7, 2:8, 2:10, 2:11 of the:2008 edition);

--- Modified the terms and definitions "loose parts", "structure sound" and "noise floor" (see 3:1, 3:4, 3:6, 2:2, 2:3,:2008 edition)

2:5);

--- Modified the general description about loose parts monitoring (see Chapter 4, Chapter 3 of the:2008 edition);

--- Revised "Characteristics and design requirements of each functional unit of the monitoring system" (see Chapter 5, Chapter 4 of the:2008 edition);

--- Revised the relevant requirements of the initial start-up test (see Chapter 6, Chapter 5 of the:2008 edition);

--- Revised the relevant requirements of the supervision program (see Chapter 7, Chapter 6 of the:2008 edition);

--- Added the description of the loose parts monitoring system in the document requirements [see Chapter 8 a)];

This document is modified to adopt IEC 60988:2009 "Acoustic monitoring systems for detecting loose parts of instruments important to safety in nuclear power plants: Characteristics,

Design Criteria and Operating Procedures:

This document has been structurally adjusted compared to IEC 60988:2009:

---3:1~3:13 correspond to 3:9, 3:7, 3:10, 3:18, 3:16, 3:3, 3:17, 3:14, 3:15, 3:6, 3:2,

3:11, 3:8;

---Divided some clauses of IEC 60988:2009:

The technical differences between this document and IEC 60988:2009 and their reasons are as follows:

--- In order to meet the requirements of the preparation of Chinese standards, the scope of the standard has been revised:

--- Regarding normative reference documents, this document has made adjustments with technical differences to adapt to the technical conditions of our country and the circumstances of the adjustment:

The situation is reflected in Chapter 2 "Normative References", and the specific adjustments are as follows:

* Replacing IEC 61226 with GB/T 15474 modified to adopt international standards (see 5:1:2);

* Replace IEC 61513 (see 5:1:2) with NB/T:20026 modified to adopt international standards:

--- In order to meet the compilation requirements of Chinese standards, the terms "burst wave interval distribution" and "burst wave amplitude" in IEC 60988:2009 are deleted:

Distribution", "Single Channel Alarm Suppression", "Adaptive Resonance Frequency", "Resonance Factor" and their definitions:

--- Put some annotations of IEC 60988:2009 in the text:

The following editorial changes have been made to this document:

--- In order to harmonize with existing standards, the name of the standard is changed to "Characteristics, design and

Operating Procedures":

Please note that some content of this document may be patented: The issuing agency of this document assumes no responsibility for identifying patents:

1 Scope

This document specifies the characteristics, design requirements and operating procedures of acoustic monitoring systems for loose components of nuclear power plant reactor coolant systems:

This document applies to the design and operation of a monitoring system for loose parts of a reactor coolant system:

2 Normative references

The contents of the following documents constitute essential provisions of this document through normative references in the text: Among them, dated citations

documents, only the version corresponding to that date applies to this document; for undated references, the latest edition (including all amendments) applies to

this document:

GB/T 15474 Classification of instrumentation and control functions important to safety in nuclear power plants (GB/T 15474-2010, IEC 61226:2005,

MOD)

NB/T:20026 General requirements for instrumentation and control systems important to safety in nuclear power plants (NB/T:20026-2014, IEC 61513:2011,

MOD)

3 Terms and Definitions

The following terms and definitions apply to this document:

3:1

loosepart

A collective term for fallen parts, loose parts and residues during construction, refuelling and maintenance of nuclear power plants:

3:2

detachedpart

A component that has lost connection to a component within the pressure boundary of the reactor coolant and thus can be carried by the reactor coolant:

3:3

loose parts loosenedpart

A part that has been loosened but remains connected to the original fixed part:

3:4

structure-bornesound

Sounds with frequencies in the audible range propagating on the surface of metal structures:

3:5

sound sensor

A transducer that converts a mechanical signal to an electrical signal and receives sound at the outer surface of the reactor coolant pressure boundary, which is assisted by a bit

motion, velocity or acceleration detection:

Note: Sound sensors in this document refer to sensors that detect "structure sound":