IR 05000338/1987028

Insp Rept 50-338/87-28 on 870810-14.No Violations Noted. Major Areas Inspected:Eddy Current Exam of Steam Generator Tubing Following 870715 Tube Rupture in Steam Generator C, Including Exam Plan & Procedures & Personnel Qualifications

ML20238A497
Person / Time
Site:	North Anna
Issue date:	08/27/1987
From:	Blake J, Newsome R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
To:
Shared Package
ML20238A477	List: IR 05000338/1987028 ML20238A473
References
50-338-87-28, NUDOCS 8709090321
Download: ML20238A497 (10)

Text

- - _ _ _ _ _ - - _ _ _ _ _ _ _ _ _ _ . - _ . _ _ _ _ . _ - - _ _ , - - - , . _ _ _ _ _ _ _ _ _ _ _ _ . - - - - - - - _ _ _ _ _ _ _ - - . _ _ , - . _ _ _ . _ _ _ _ . _ _ _ _ _ _ _ _ . _ - - _ - . _ _ - - _ . . . _ . . - - - - . . _ _ , . . _ . -

UMITED STATES

. [,,a Rfoub;o NUCLEAR REGULATORY COMMISslOM p . . .. . ~ ,$

-

REGION 11-J' yj 101 MARIETTA STREET, :* 'c . ATLANTA, GEORGIA 30323

%...../ > -

Report ;.os. : 50-338/87-28

!

Licensee: Virginia Electric'and Power Company ,

Richmond, VA 23261 l Docket Nos.: 50-338 License Nos.: NPF-4 Facility Name: North Anna 1 l

Inspection.Conductedi Au ust 10-14, 1987 Inspector: l<< vwna- 9-27-87

'

R e .

ate Signed Approved by: 7 7 7 . Blake, Chief Date Signed erials and Processes Saction vision of Reactor Safety SUMMARY

, Scope: This routine, unannounced. inspection was in the areas of Eddy Current Examination of the Unit 1 Steam Generator tubing follow the July 15, 1987 tube rupture in Steam Generator C. Areas of inspection included: examination plan, examination procedures, personnel qualifications, observation of in progress examinations, examination data review, and steam generator tube examination data analysi '

Results: No violations or deviations were identifie i l

i G

- _ - _ - -- - - . _ _ _ _ _ _

<

i

.

REPORT DETAILS

' Persons Contacted Licensee Employees

• E. W. Harrell, Station Manager

• G. E. Kane, Assistant Station Manager, Operations & Maintenance

.

• J. W. Ogren Director, Operations & Maintenance Support

. D. Dodson, Senior Staff Specialist

• L. N. Hartz, Engineering Supervisor, Inservice Inspection (ISI)

• E. W. Throckmorton, Manager, Nondestructive Examination (NDE) Services

• H. L. Travis, Supervisor Quality, NDE

• G. Harkness, licensing Coordinator

• R. C. Bilyeu, Nuclear Operations Licensing Other licensee employees contacted included construction craftsmen, engineers, technicians, mechanics, security force members, and office personnel.

,

NRC Resident Inspectors

• J. L. Caldwell, Senior. Resident Inspector

• Attended exit interview Exit Interview The inspection scope and fin' dings were summarized on August 14, 1987, with those persons indicated in the above paragraph. The inspector described the areas inspected _ and discussed in detail the inspection finding No dissenting comments were received from the license The licensee did identify some material as proprietary during this inspection, but this material is not included in this inspection repor . Licensee Action on Previous Enforcement Matters This subject was not addressed in the inspectio . Unresolved Items Unresolved items were not identified during this inspectio _ _ _ _ _ _ _

_ _ _ - _ _ _ _ _ _ _ _ _ _ ._

.

'

2 Steam Generator (SG) Tubing Eddy Current Examination - Unit 1 The examinations currently in progress are being accomplished as a result of'a tube rupture that occurred on July 15, 1987 in'SG "C". The rupture was circumferential and was located on the Cold Leg (CL) side of the SG at Row.9 Column 51.just above the 7th tube support plate. For additional o information concerning this event and subsequent actions by the licensee, refer to NRC report 50-338, 339/87-2 The NRC inspector. examined documents, activities, and records,.as indicated below, to determine whether these Eddy Current (EC) examination activities were being conducted in accordance with applicable procedures, regulatory

.

l requirements and licensee . commitment The applicable code for this

, examination. is the American Society of Mechanical Engineers Boiler and Pressure Vessel Code,Section XI 1983 edition with addenda through winter 198 Westinghouse Electric Corporation (WEC) is conducting the EC examinations for the licensee. The EC examination data analysis is being conducted by both WEC and Echogram Technology, Inc. a WEC owned company, Eddy Current Examination Plan Review (73051)

The inspector reviewed the below listed documents relating to the licensee's EC examination plan, for the current outage, in the areas of: plan approval; QA requirements (examination reports,- control of deviations from established plan; quality documentation and

'

identification-of components; work and quality inspection procedures; control of. processes;-corrective action; document control; control of examinations and examination equipment; quality records; inspection

. scope; personnel qualifications; and, Nondestructive Examination (NDE) records including provisions for storag 'C' S/G Outage Initial Eddy Current Inspection Plan SG-A Cold Leg Bobbin Coil Test Plan SG-A 8 x 1 Cold leg Inspection Plan SG-A 8 x 1 Hot Leg Inspection Plan SG-B Cold Leg Bobbin Coil Test Plan

SG-B 8 x 1 Cold Leg Inspection Plan

SG-B 8 x 1 Hot Leg Inspection Plan

SG-C Cold Leg Bobbin Coil Test Plan SG-C 8 x 1 Cold Leg Inspection Plan SG-C 8 x 1 Hot leg Inspection Plan Steam Generator Eddy Current Data Analysis Program North Anna Unit 1 Tube Rupture Outage Summer,1987 (Preliminary)

The. examination plan requires the use of three different EC probe types - standard bobbin, 8x1, and Rotating Pancake Coil (RPC) - to be used for the evaluation of the tubing condition in each of the three steam generator These specialized EC probes will be used in conjunction with the MIZ18 digital data acquisition and analysis syste The specialized EC probes and MIZ18 system are considered

- _ _ _ - _ _ _ _ _ _ .

. _ _ _ _ - _ - _ _ _

l

'

state-of-the-art tools and as such are able to detect potential flaws regardless of flaw major axis orentation if each EC probe is used individually in each tub The proposed examination plan requires that the RPC be utilized to confirm or disprove any potential flaw type indications detected by the standard bobbin coil probe or the 8x1 probe. The number of tubes to be examined in each SG and with each EC probe is tabulated below. The massive number of tubes to be examint:d and the utilization of more than one type EC probe for examination of these tubes, in both cases, is considerable beyond the minimum examination requirements imposed on the licensee through commitments or controlling specification Probe Type Standard Bobbin 8XI SG A Tubes- 2685 3179(H)

3179 (C)

SG B Tubes- 2662 3210 (H)

3210 (C)

SG C Tubes- 374(H) 3117 (H)

2390(C) 3117 (C)

(H) = Hot leg (C) = Cold leg b. Review of Procedures (73052)

(1) The inspector reviewed the procedures indicated below to determine whether they were consistent with regulatory requirements and licensee commitments. The procedures were also reviewed in the areas of procedure approval, requirements for qualification of NDE personnel, and compilation of required records; and if applicable, division of responsibility between the licensee and contractor personnel if contractor personnel are involved in the effor Procedure ID Ti tle MRS 2.4.2 VRA-10 R-2 SM-10W Operating Procedure MRS 2.4.2 VRA-4 R-3 Digital Multifrequency Eddy Current Inspection of Preservice and Inservice Heat Exchanger Tubing Analysis Rules Steam Generator Procedure Package for Inspection with Addendum 1 (Draft) Bobbin Coil Analysis 8x1 Coil Ar.c.ysis MRPC Coil Analysis

_ _ _ _ - _ _ ._

_

~

(2) The inspector also reviewed procedures MRS 2.4.2 VRA-4 and Analysis Rules Steam Generator Inspection for technical content relative to: multichannel examination unit, multichannel examination indication equipment is specified, examination sensitivity, material permeability, method of examination, method of calibration and calibration sequence, and acceptance criteri c. Observation of Examination Data Acquisition and Analysis (73753)

The inspector observed the activities described below to determine whether these activities were being performed in accordance with regulatory requirements and licensee procedure (1) Examiner Qualification (a) The inspector reviewed the basic Eddy Current qualification documentation for ten examiners that included both WEC and Echogram Tech. Inc. personnel. This documentation was reviewed for the following: employer's name; person certified; activity qualified to perform; effective period of certification; signature of employer's designated representatives; basis used for certification; and, annual visual acuity, color vision examination, and periodic decertificatio (b) In addition to the basic examiner qualifications noted above, the licensee has established an Eddy Current data analyst qualification program that requires each analyst to demonstrate their ability to interpret the data generated by a probe type, i.e. bobbin, 8x1, etc., before the examiner will be allowed to evaluate dat Each analyst is not required to qualify for all types of probe data, but may only interpret data gathered by the particular probe type (s)

for which the individual has demonstrated competency. The candidate is considered qualified when a test derived from previous inspection data for the probe type is taken and passed using the licensee's examination grading syste The licensee's program also requires that a written record be established of an analyst's examination results and these records serve as evidence of qualificatio The records generated from these examinations are considered quality assurance records. The licensee's data analyst qualification program also allows the use of electronic assistance tools to be used in the data evaluation process provided the electronic system is subjected to qualifi-cation. Qualification of the electronic system must be demonstrated using the same data as any other analyst candidat Two electronic systems are currently being utilized during this examination; 1) WEC Intelligent Eddy Current Data

,

Analysis Program (IEDA) and 2) Zetec Digital Data Analysis

System (DDAS),

t

{

w _ _ - ___ __

_ _ _ - - _ _ _ - _ _ _ _ _ _ _ .- _-

.

l 5 The inspector. reviewed portions of each of the licensee's analysts examinations to evaluate the degree of difficulty of each of the examinations and to determine the general quality .of the. individual examinations. In this respect, the1 inspector determined that the examination for the standard bobbin . coil data, currently being' administered, was of good quality and the difficulty of the examination was consistent with expected steam generator tubing. EC indications. The examination 'for the 8x1 probe data was -

of good quality. and was consistent with expected steam generator tubing indications; however, there appeared to be a minor weakness in.the variety of tube data being submitted to the candidat This. information was'

transmitted to the licensee and was being corrected. .The examination for the RPC probe. data appeared to be of high quality. and. representative of the indications normally-

'found in steam generator The inspector reviewed several of the personnel data analysis qualification records to confirm that these records were complete and that ~ the examinations were properly graded in accordance with the licensee's grading system. The inspector determined that the records examine were generally complete and adequate. The examinations were-generally graded in accordance with the licensee's grading system with some minor numerical score inconsistencies which had.no significant bearing on the personnel currently qualifie It. should be noted that the licensee's data analysis personnel qualification program is well above. the requirements imposed on the licensee from any controlling specifications, codes or licensee commitments. Further, a program of this type promotes assurance to all concerned that the individuals conducting EC data analysis are of high quality and are competent within the confines of their specific data analysis qualification (2) The inspector observed the Eddy Current activities indicated belo The observations were compared with the applicable

. precedures and the Code in the following areas: the Multi-Channel Eddy Current Examination equipment has been identified including indicator, meter, tube, strip recorded and tape; method for maximum sensitivity is applied; method for determining material permeability; method of examination has been recorded; examination equipment has been calibrated in accordance with the applicable performance reference; amplitude and phase has been calibrated with the proper applicable calibration reference and is recalibrates at predetermined

-__ _ _ - _ _ - - - -

- - _ _ _ _ _ _ _ _ _ _ _ _ _ ___ _ . _ _ _ _

e

~

frequency; required coverage of steam generator tubes occurs during the examination; acceptance criteria is specified or referenced; and, results are consistent with acceptance criteri (a) Tube Data Acquisition:

Tube I.D.

l Steam Generator Row Columm Probe Type

"A"- Cold Leg

"

3T 28 8x1

"

40 28

" "

41 28

" "

l 42 28

" "

l 41 27

" "

40 27

" "

39 27

" "

38 27

" "

28 26

" "

l 30 26

" "

31 26

" "

33 26

"

"B"- Hot Leg 10 13

"

"

9 13

" "

8 13

" "

7 13

" "

l 6 13

" "

l 5 13

" "

'

" "

3 13

" "

2 13

" "

2 14

" "

3 14

" "

4 14

" "

5 14

" "

6 14

"C"-Cold leg 11 62 Standard Bobbin

" "

12 62

" "

13 62

" "

14 62

" "

15 62

" "

16 62

" "

17 62

" "

18 62

" "

21 62 During the observation of the data acquisition for the above listed tubes, the inspector also observed two instrument calibration verifications and five probe location verifications. One of the instrument calibration verifications was conducted using calibration standard WEM-02587 and the certification documentation for this calibration standard was reviewed by the inspecto . _ _ .

. _ _ _ . __ _- - - _ _ _ _ - _ _

l

i

l (b) Tube Data Analysis: l

The licensee's data. evaluation program requires that the

'

obtained data will be evaluated by. two analysts working totally independent of each. other. When interpretation conflicts arise, the two involved analysts review the signals jointly and resolve the conflict 'in accordance with established analysis rule If  !

the signal in- conflict is determined to be a relevant indication j no further action is , require However, if the signal . in j conflict is determined not to be representative. of a relevant i indication, agreement of a third analyst is required before the l signal' can be classified as non-relevan ]

The inspector. observed the- two electronic analysis assistance l systems, IDEA and DDAS, and Westinghouse and Echogram Technology, 1 In personnel' performing data analysis' functions on the below l listed tube These observations included several analysts and l included both primary and secondary tube data evaluations and '

evaluations being conducted by a lead analys ;

Tube Steam Generator: Row Column ' Data Type

"A"-Cold Leg 30 49 8x1

" "

29 49

" "

28 49

" "

27 49

" "

45 47  !

" "

44 47

" "

43 47

" "

42 47

" "

41 47

" "

25 19

" "

24 19

" "

23 19

" "

22 19

"C"-Thru U-Bend 23 74 Standard Bobbin

"- " "

24 70

" " "

26 70

" " "

27 70

" " "

29 70

" " "

32 70

" " "

19 72

" " "

33 70

" " "

20 72

" " "

35 70

" " "

22 72

" " "

36 70 Full Length 45 57

"

"

Thru U-Bend 44 57

" " "

42 57 Full Length 41 57

"

i i

_ _ - - - _ _ . - _ . - . _ . . . _ . _ _

_ _ _ _

.

'

d. Eddy Current Data Review and Evaluation (73755)

(1) Records of completed EC examinations were not available because final analysis had not been completed on any of the examined tube However, records of preliminary examination records for, those tubes listed in Paragrapi, 3.c.(2), were reviewed to determine if: the method, technique, and extent of the examination complied with the examination plan and applicable procedures; findings were properly recorded and evaluated by qualified personnel; and, personnel, instruments, and calibration standards were designate (2) The inspector discussed the EC program and examination status with the licensee just prior to the conclusion of this inspection. The EC examination status for the Unit 1 steam generators at the conclusion of this inspection is tabulated belo Number of Tubes PROBED Steam Generator Standard Bobbin 8x1 RPC A 2685 3179 CL 0 0 HL 0 B 2662 3210 CL 0 839 HL 0 C 2390 CL 784 CL 0 370 HL 3117 HL 0 Number of Tubes ANALYZED Steam Generator Standard Bobbin 8x1 RPC

'

A 1139 523 CL 0 0 HL 0 B 1877 0 CL 0 0 CL 0 C 1158 CL 61 CL 0 370 HL 136 HL 0 I

CL-cold leg HL-hot leg ,.a ro In this area of inspection, no violations or deviations wery identifie a-j

,

.

'

) $

I :

_a .I

-

La

.,

1 L___.__________.____________ _

_ _ , - -_,,_ - - , , , - - - - , . - - _ _ - - - - - - - -

a N

in

&

, <r>

o <C i

. gm i

.

m y) C I D d r-l l

,