Item No.

Field Name

Type

Description

1

UPDATE

Date

Date of the most recent update.

2

MER

Yes/No21

Multiple Events Report; some reports include information on more than one crack/leak in one system. Used to identify events where a discovery resulted in an investigation (e. g., augmented ISI) to identify further piping degradation due to a common cause. A new record is added if additional degradation is positively identified (by component socket).

3

DDA

Text

Data filter used to classify a record as either ‘public’ (= Licensee Event Report), ‘restricted’ or ‘proprietary.’

4

QA-Index

Number

QA-Index of ‘1’ signifies a data entry determined to be ‘complete.’ By contrast, a QA-Index of ‘6’ signifies a database entry for which only a LER (or equivalent) abstract was available.

5

EVENT DATE

Date

Event date (MM/DD/YY); date of discovery (in case of ISI).

6

PLANT TYPE

Text

Plant type; e. g., BWR, PWR, used as data filter.

7

DESIGN

Text

NSSS design/design generation; keyword using generally accepted or standard nomenclature. This field is used as a data filter.

8

NSSS-VENDOR

Text

Reactor vendor; e. g., ABB-Atom, KWU/Siemens, Westinghouse; used as data filter.

9

PLANT NAME

Text

Plant name

10

COUNTRY

Text

Two-letter code based on the ISO 3166-1-alpha-2 code elements.

11

CONSTRUCTOR

Text

Name of company responsible for the original piping system design. The default name is the architect engineering firm. Used as data filter.

12

COD

Date

Date (MM/DD/YY) of commercial operation as default. If known, date of initial criticality. For U. S. data, based on NUREG-0020

13

PLANT

Text

Plant operational state (at the time of discovery); keyword using generally accepted or standard nomenclature. This field is used as a data

Item No.

Field Name

Type

Description

OPERATIONAL STATE — POS

filter. Pulldown menu with the following options: § CSD — Cold Shutdown § HSD — Hot Shutdown § HSB — Hot Standby § Refueling § Shutting Down § Starting Up § Power Operation

14

REFERENCE-1

Text

Primary reference

15

REFERENCE-2

Text

Secondary (or supplemental) reference

16

REFERENCE-3

Text

Tertiary (or supplemental) reference

17

LER-RO?

Yes/No

Check if the information source is a Licensee Event Report (or equivalent); i. e., from a regulatory reporting system.

18

EVENT TYPE

Text

Event type; ‘Crack’, ‘Wall Thinning’, ‘P/H-leak’ (P/H = pinhole), ‘Leak’, ‘Severance’, ‘Rupture.’ Used as data filter.

19

FAILURE-ON-

DEMAND

Yes/No

Check if pipe failure occurred when a demand was placed on the affected system (e. g., standby system). Used as data filter.

20

SYNERGY

Yes/No

Check if the pipe failure was caused by multiple degradation mechanisms; e. g., crack initiation through IGSCC and crack propagation through thermal fatigue. Used as data filter.

21

DEGRADATION+ LOADING

Yes/No

Check if the pipe failure resulted from the combined effect of a degradation mechanism (e. g., flow-accelerated corrosion, FAC) and a severe (or unusual) loading condition. Used as data filter.

22

ECA

Text

Event Category. Used as data filter. This database field is used to

characterize actual or potential impact on plant risk by a degradation or

failure. The following options are available:

§ S-/M-/L-LOCA (implies that a pressure boundary failure resulted in ESF actuation);

§ S-/M-/L-LOCA Precursor (implies mitigation of a pressure boundary failure through prompt operator response; e. g., plant shutdown prior to reaching ESF actuation setpoint);

§ Internal Flooding (spill rate in excess of room/compartment floor drain capacity);

§ Internal Flooding Precursor (accumulation of large water volumes prevented through prompt operator response);

§ Common Cause Initiating (CCI) Event (pressure boundary failure results in spatial effects through spraying or steaming of safety equipment);

§ CCI Precursor (pressure boundary failure results in spraying or

steaming but prompt operator action prevents safety equipment from being affected);

§ System Disabled (pressure boundary failure is large enough to incapacitate a system function);

§ System Degraded (default used for at-power events that result in an entry into a Technical Specification Action Statement).

23

CCC

Yes/No

Check if event is considered to be a ‘common cause candidate’ (CCC) event. Used as data filter.

24

CA

Text

Corrective Action. Used as data filter. The following types of corrective action are defined:

§ REPAIR (used in a generic sense);

§ REPLACEMENT § REPLACEMENT — IN-KIND § REPLACEMENT — NEW MATERIAL § TEMP. REPAIR (temporary repair to allow continued operation until next refueling outage or major maintenance outage at which time a Code-repair (which would require system isolation and

Item No.

Field Name

Type

Description

draining) or a replacement is performed.

§ WOR (= weld overlay repair); primarily applies to ASME Section XI Class 1 or 2 (or equivalent) piping.

25

ISS

Yes/No

Safety system actuation; check if pipe failure resulted automatic actuation of a make-up system or other safety system. Used as data filter.

26

IRT

Yes/No

Automatic reactor trip; check if pipe failure resulted in automatic reactor trip/turbine trip. Used as data filter.

27

IPO

Text

Impact of pipe failure on plant operation; e. g., power reduction, manual reactor trip. Used as data filter.

28

TTR

Number

Repair time in hours.

29

TTR-Class

Number

A data filter: 1: TTR < 8 hours; 2: 8 < TTR < 24 hours; 3: 24 < TTR < 96 hours; 4: 96 < TTR <168 hours; 5: TTR > 168 hours.

30

NARRATIVE

Memo

Event narrative; includes details on plant condition prior to event and plant response during event, method of detection, corrective action plan. This field should include sufficient information to support independent verification of the event data classification.

31

LQT

Number

Quantity of process medium released [kg]

32

DOL

Text

Duration of release

33

LRT

Number

Leak rate [kg/s]

34

gpm

Number

Leak rate [U. S. gallons/minute]

35

LEAK CLASS

Number

A data filter: 1: Leak Rate (LR) < 1 gpm; 2: 1 < LR < 5 gpm; 3: 5 < LR < 10 gpm; 4: 10 < LR < 50 gpm; 5: LR > 50 gpm.

36

FLO

Text

Location of crack/leak/rupture; description of where in the piping system a degradation or failure occurred. Include sufficient detail to support the consequence evaluation/classification.

37

K1

Yes/No

Data filter; steamline break outside containment.

38

K2

Yes/No

Data filter; feedwater line break

39

K3

Yes/No

Data filter; steamline break inside containment.

40

IMPULSE-LINE

Yes/No

Check (= ‘Yes’) if affected line is a valve impulse line.

41

INSTR. LINE

Yes/No

Check (= ‘Yes’) if affected line is an instrument sensing line.

42

ISOMETRIC DRAWING #

Text

Isometric drawing number

43

P&ID #

Text

Piping and instrument drawing number.

44

MSA

Text

Name of the affected plant system

45

SHARED

Yes/No

Check (= ‘Yes’) if affected piping is shared by two reactor units. Mainly applies to support systems (e. g., Service Water, Instrument Air) where sections of a piping system may be shared by two reactor units; this is relatively common in the U. S.

46

OSA

Text

Name of other systems affected by the degradation or failure. Secondary effects of piping failure

47

S-TYPE

Text

Category of system affected by the degradation or failure. Used as data

filter. The following types are used:

• RCPB (Reactor Coolant Pressure Boundary);

• SIR (Safety Injection & Recirculation); includes emergency core cooling systems & decay heat removal).

• CS (Containment Spray)

• AUX (Reactor Auxiliary Systems); includes component cooling water, chemical & volume control, reactor water cleanup, control rod drive, containment heat removal, standby liquid control, radwaste control, spent fuel pool cooling.

• FWC (Feedwater & Condensate Systems)

• STEAM (Main Steam System)

• SUPPORT (Service Water & Instrument Air systems)

• PCS (turbine generator)

• FIRE (Fire Protection).

Item No.

Field Name

Type

Description

48

ISO

Yes/No

Check if the affected pipe section can be isolated to prevent or mitigate direct/indirect impacts.

49

DET

Text

Method of detection; e. g., ISI, WT = walk-through inspection, leak detection system in combination with control room indication and/or alarm. Used as data filter. Pulldown menu with the following options: § Walk-through § UT-examination § Liquid penetrant testing § Hydrotesting § Leak detection § Containment/drywell inspection § Control Room Indication

50

DRYWELL

ENTRY

Yes/No

BWR-specific data field. Checked for ‘at-power’, unidentified P/H-leak or leak requiring power reduction or reactor shutdown for containment drywell entry to determine leak source. Used as a data filter. Also, this data could be input to plant availability models.

51

CONTAINMENT

ENTRY

Yes/No

Check if power reduction initiated to allow for containment entry to identify source of leakage. Used for other than BWR plants.

52

CRS

Text

Verbal description of crack morphology; orientation and size/ geometry of crack or fracture

53

CRACK-DEPTH

Number

Crack depth in percent of wall thickness (a/t-ratio)

54

AXIAL-LENGTH

Number

Axial crack length in [mm].

55

CRACK-LENGTH

Number

Circumferential crack length as percent of inside diameter

56

ASPECT-RATIO

Number

Ratio of crack depth (a) to flaw length (L)

57

WELD-CONFIG

Text

Configuration of the affected weld in a piping system; e. g., BP = bend-to — pipe weld, PP = pipe-to-pipe weld, etc.

58

INSIDE

CONTAINMENT

Yes/No

Check if pipe failure located inside containment

59

AUXILIARY

BUILDING

Yes/No

Check if pipe failure located in Auxiliary Building (PWR)

60

REACTOR

BUILDING

Yes/No

Check if pipe failure located in Reactor Building (BWR)

61

TURBINE

BUILDING

Yes/No

Check if pipe failure located in Turbine Building

62

Not used

N/A

N/A

63

Not used

N/A

N/A

64

CTA

Text

Component Type; pulldown menu with the following options: § Bend § Elbow

§ Elbow — 45-degree § Elbow — 90-degree § Elbow — LR (Long Radius)

§ Pipe § Reducer § Tee § Weld § Socket weld

65

ASME Class

Number

Differentiate between 1, 2, 3 and 4 (= non-Code Class)

66

BELOW-GRADE

Yes/No

Check if ‘Yes’; Below Grade / Underground Piping. Used as data filter.

67

FIELD-WELD

Yes/No

Check if ‘Yes’. Used as data filter.

68

SHOP-WELD

Yes/No

Check if ‘Yes’. Used as data filter.

69

CONCRETE-LINED

Yes/No

Check if ‘Yes’; could apply to essential or non-essential service water (or equivalent) system piping. Used as data filter.

70

REPLACEMENT

Yes/No

Check if piping replaced using new material.

71

REPL-DATE

Date/Time

Date of component (e. g., weld and spool piece) replacement. Used in hazard plotting.

Item No.

Field Name

Type

Description

72

YOO

Number

Years of commercial operation when failure occurred. Used in aging analysis.

73

AGE

Number

Age of component socket [hours]. Used in hazard plotting. For additional information.

74

CLASS

Number

Based on diameter; events grouped in six diameter classes; 1 = (< DN15), 2 = (15 < DN < 25), 3 = (25 < DN < 50), 4 = (50 < DN < 100), 5 = (100 < DN < 250), 6 = (> DN250). DN = nominal diameter in [mm]. This field is used as a data filter.

75

THOMAS

Number

Ratio of diameter and pipe wall thickness ([CSI/WTK]); for details, see the paper by H. M. Thomas (1981): “Pipe and Vessel Failure Probability,” Reliability Engineering, 2:83-124. This field is used as a data filter.

76

CSI

Number

Nominal diameter [DN] in [mm]. Used as data filter.

77

WTK

Number

Wall thickness [mm]

78

SCHEDULE

Number

Pipe schedule number

79

DIS-MET

Yes/No

Dissimilar metal weld; check if ‘yes’. Used as data filter.

80

MTR

Text

Material; e. g., carbon steel, stainless steel, etc. Used as data filter.

81

MTR-DES

Text

Material designation according to national standard; e. g., AISI 304, SS2343, etc. Used as data filter.

82

PMD

Text

Process medium. Used as data filter.

83

RAW WATER

Text

Source of raw water (applies to Fire Protection and Service Water piping); differentiate between LAKE — RIVER — SEA-BRACKISH. Used as data filter.

84

STG

Yes/No

Normally stagnant process medium? Used as data filter.

85

HWC

Yes/No

For BWRs; hydrogen water chemistry; check if ‘Yes’. Used as data filter (e. g., in factor-of-influence assessments).

86

HWC-START

Date/Time

Date when HWC was introduced

87

NMCA

Yes/No

Check if Noble Metal Chemical Addition. Used as data filter.

88

NMCA-Start

Date/Time

Date when NMCA started.

89

IHSI

Yes/No

Induction heat stress improvement; check if ‘Yes’. Used as data filter.

90

IHSI-DATE

Date/Time

Date when IHSI was performed

91

MSIP

Yes/No

Check if Mechanical Stress Improvement Process applied to weld. Used as data filter.

92

MSIP-Date

Date/Time

Date of MSIP application

93

S-A

Number

Stress intensity allowance; ratio of the critical stress intensity factor to the assessed stress intensity factor given a flaw. This information is extracted from fracture mechanics evaluations.

94

OPA

Number

Operating temperature [°C]

95

DPA

Number

Design temperature [°C]

96

OPB

Number

Operating pressure [MPa]

97

DPB

Number

Design pressure [MPa]

98

OPC

Text

Process medium chemistry (for primary system); e. g., NWC = normal water chemistry, HWC = hydrogen water chemistry. Used as data filter.

99

MPR

Text

Method of fabrication; e. g., cold formed, hot formed. Used as data filter.

100

SYS

Yes/No

Systematic failure? Used as data filter to enable queries that address the effectiveness of remedial actions (e. g., preventing recurring failures).

101

RFL

Text

Description of the extent and nature of a systematic failure

102

REST

Yes/No

Failure due to deficient system restoration?; e. g., no venting prior to fill procedure, etc. Used as data filter.

103

CEA

Text

Apparent cause of failure; e. g., IGSCC, PWSCC, TGSCC, etc. Used as data filter. Pull down menu with the following options:

• B/A SCC (B/A = boric acid)

• Corrosion (general, pitting or crevice corrosion)

• Corrosion-fatigue

• Erosion

Item No.

Field Name

Type

Description

• Erosion-cavitation

• Flow accelerated corrosion (FAC)

• Fretting

• HF: Construction/installation error

• HF: Human error

• HF: Repair/maintenance error

• HF: Welding error

• HPSCC (High Potential SCC)

• IGSCC

• MIC (Microbiologically induced corrosion)

• Overpressurization

• PWSCC

• Severe overloading (other than water hammer)

• SICC (Strain-rate induced SCC)

• TGSCC

• Thermal fatigue

• Unknown

• Unreported

• Vibration

• Vibration-fatigue

• Water hammer

104

EPRI-CODE

Text

Failure code as used in the EPRI ’97 / EPRI ’98 databases (see for example EPRI TR-110161 (Piping System Reliability and Failure Rate Estimation Models for Use in Risk-Informed In-Service Inspection Applications, December 1998). Used as data filter. Pull down menu with the following options:

§ CF — Corrosion-fatigue

§ COR — General corrosion, microbiologically induced corrosion (MIC), pitting corrosion § COR-EXT — external corrosion § D&C — Design & Construction errors § E-C — Erosion-cavitation § E/C — Erosion-corrosion § FRET — Fretting § HE — Human Error § OVP — Overpressurization § SCC — Stress corrosion cracking § TF — Thermal Fatigue § UNK — Unknown § VF — Vibration-fatigue § WH — Water hammer

105

RC1

Text

Contributing factor number 1

106

RC2

Text

Contributing factor number 2

107

CEC

Memo

Description of events and causal factors. Include sufficient technical detail from the root cause analysis process so that recurrence may be prevented.

108

CMT

Memo

Any other information of relevance to understanding of underlying causal factors. Also, information on the type and extent of repair/replacement. The purpose of this free-format database field is to facilitate future applications, for example, by codifying the information on piping replacements.

109

ISI

Yes/No

Deficient ISI; e. g., ISI not performed, or ISI failed to detect a flaw. Used as data filter to identify events caused by ISI program deficiencies (e. g., affected component should have been included in program) or an inspection prior to failure missed a degradation that propagated in the

Item No.

Field Name

Type

Description

through-wall direction.

110

ISI-CMT

Memo

Comments on ISI history; e. g., date of last inspection, details on examination technique(s).

111

mCF

Yes/No

Check if there are multiple circumferential flaws in a weld.

112

Number of Flaws

Number

113

D0-1

Number

Distance from 12 o’clock position to the first circumferential flaw; this field is repeated for up to nine flaws.

114

CF-1

Number

Length of the first circumferential flaw (counted from the 12 o’clock position