ML20215L842
| ML20215L842 | |
| Person / Time | |
|---|---|
| Site: | Sequoyah  |
| Issue date: | 05/06/1987 |
| From: | Russell Gibbs, Martin M TENNESSEE VALLEY AUTHORITY |
| To: | |
| Shared Package | |
| ML20215L813 | List: |
| References | |
| 223.2(B), 223.2(B)-R01, 223.2(B)-R1, NUDOCS 8705120396 | |
| Download: ML20215L842 (12) | |
Text
,
.,4 REPORT NUMBER: 223.2(B) e.k .
TVA EMPLOYEE CONCERNS SPECIAL PROGRAM
~
REVISION NUMBER: 1 REPORT TYPE: SEQUOYAH ELEMENT TITLE: INSTRUMENT SUPPORT DESIGN Instrument Mounting Brackets PAGE 1 0F 10 REASON FOR REVISION:
- 1. Revised to incorporate Section 10, Corrective Action, and CATD List; revised Appendix A.
PREPARATION PREPARED BY:
'n HA7 % tb 4- l3 -87 DATE
'/ % SIGNATURE REVIEWS DER: REVIEW COMMITTE hdlOA% / SIGNAT A_ //-/s -e 7 DATE TASgdi7 t1 $$ 5/l87
/ AATE i' SIGNATURE CONCURRENCES kl01hh $50 7 0' - ()- l -l4 Yl/ClQ CEG-H: $ ? d Mu-kk/ 4.2n 91 DATE SRP w$ SIGNATURE
- M" S* 5~87 DATE SIGNATURE APPROVED BY:
Lib .5 MNoek!*iJ b~/G /d - N/A MANAGER OF NUCLEAR POWER DATE DATE
- SRP(ecretaryCSPM'ANAGER a signature denotes SRP . CONCURRENCE .(FINAL REPORT ONLY) concurrences are in files.
-- - a a
TVA EMPLOYEE CONCERNS REPORT NUMBER: 223.2(B)
SPECIAL PROGRAM REVISION NUMBER: 1 PAGE 2 0F 10
- 1. CHARACTERIZATION OF ISSUES:
Concern: Issues:
- a. Instrument mounting brackets are not IN-85-973-002
" Typical instrument mounting strong enough to support instru-brackets consisting of thin ments.
gauge, perforated sheetmetal
- b. In heavy traffic areas, the brackets (or similar material) are not are susceptible to abusive treatment strong enough to support the which causes damage to brackets and instruments (generic for typical mounts). Constant bumping into, instruments.
leaning against, and sitting on these brackets / instr. causes c. All such installations should be damage to both brackets and redesigned, instruments. CI could not .
provide specific instrument numbers, locations, etc., but stated all such installations The following issue from this should be subject to re-design. concern is addressed in another This was reported to manager report:
(known) but no action was taken." This deficiency was reported to L
manager but no action was taken (addressed by Management Group in Sequoyah Element Report 706.01).
- 2. HAVE ISSUES BEEN IDENTIFIED IN ANOTHER SYSTEMATIC ANALYSIS?_YES X_ NO Identified by Gilbert / Commonwealth (G/C) and TVA i Date 03/03/86 and 06/04/86 Documentation Identifiers:
G/C Report No. 2614 and TVA - Generic Concern Task Force (GCTF)
Report for Concern No. IN-85-463-006.
- 3. DOCUMENT NOS., TAG NOS., LOCATIONS OR OTHER SPECIFIC DESCRIPTIVE IDENTIFICATTUNS STATED IN ELEMENI':
The concern addressed instrument mounting brackets in general.
1 0574D - 04/13/87
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TVA EMPLOYEE CONCERNS REPORT NUMBER: 223.2(B) e ..
- SPECIAL PROGRAM REVISION NUMBER: 1 PAGE 3 0F 10
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- 4. INTERVIEW FILES REVIEWED:
The working and expurgated interview files for concern IN-85-973-002 were reviewed. The expurgated file contains only the K-form and the working file does not have any other new item (App. A, 7.a).
- 5. DOCUMENTS REVIEWED RELATED TO THE ELEMENT:
See Appendix A.
- 6. WHAT REGULATIONS, LICENSING COMMITMENTS, DESIGN REQUIREMENTS OR OTHER APPLY OR CONTROL IN THIS AREA?
See Appendix A.
- 7. LIST REQUESTS FOR INFORMATION, MEETINGS, TELEPHONE CALLS, AND OTHER_
DISCUSSIONS RELATED TO ELEMENT.
i.
K- See Appendix A.
- 8. EVALUATION PROCESS:
- a. Reviewed FSAR and SQN design criteria for TVA's commitments to operating and seismic design requirements for Category I instrument supports.
- b. Obtained and reviewed TVA drawing series 47W600 which shows instrument mounting brackets.
- c. Reviewed various revisions of applicable drawings for evidence of changes in engineering design requirements.
- d. Reviewed seismic qualification test data, which support design, and performed calculations, as needed.
05740 - 04/13/87
,I , TVA EMPLOYEE CONCERNS REPORT NUMBER:- 223.2(B)-
- SPECIAL PROGRAM REVISION NUMBER: '1 g -PAGE 4'0F 10 kl,
- 9. DISCUSSION. FINDINGS. AND CONCLUSIONS:
Chronology:
07/31/85: -Concern submitted to TVA .
03/03/86: G/C reported deficiency in fasteners of. instrument mounting brackets .
06/04/86: TVA GCTF recommended walkdowns to verify adequacy of safety-related instrument installations Discussion:
FSAR Section 3.10, " Seismic Design of Category I Instrumentation and Electrical Equipment," identifies TVA's commitment to provide instruments which are capable of performing their functions during and following a safe shutdown earthquake. Instruments are classified as Seismic Category I in accordance with the systems and their functions. .Furthermore, SQN design criteria SQN-DC-V-10.3 and 10.4 articulate the requirements.that " instruments sha designed and installed so that normally imposedloads loads plus,11 be imposed by the design basis earthquake will not cause failure or p - functional degradation of instruments or control system w performance."
The majority of instruments at SQN are mounted on seismically qualified local panels which are floor-mounted. Where space requirements preclude the use of local panels, small wall-mounted panels are also used for instruments. Seismic qualification of-these instruments and their supports is addressed in Sequoyah Element Report 223.3(B). Concern about lack of typical installation detail drawings for instruments is covered in Sequoyah Element Report 80501-SQN, " Engineering' Document Quality." The j following discussion, therefore, focuses only on aspects of instrument mounting brackets, as stated in Section 1.
l
! Drawing 47W600-14 shows details of a typical local instrument panel frame bolted to the floor. The horizontal channel members of the frame are a combination of light Unistrut channels. The 1/4-inch thick modular mounting plate (detail A14) types 'A' through 'R' are bolted to the channels and, in turn, directly' support a wide variety of instruments. However, some panel mounted instruments require additional brackets for mounting because of their physical
! characteristics. These brackets and the instruments are the subject of the concern. The individual weight of the instruments
! that require brackets seldom exceeds 50 pounds. Mounting bracket details for specific instruments are shown on the TVA 47W600 series drawings. The drawings indicate bracket thicknesses in the range
( of 0.09 to 0.125 inch with holes and/or slots for mounting 0574D - 04/13/87 1
l
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'TVA EMPLOYEE CONCERNS- REPORT NUMBER: 223.2(8)
"P SPECIAL PROGRAM REVISION' NUMBER: 1 PAGE 5 0F 10
[eg 1.
using 1/4-inch to 3/E-inch' bolts. The bracket are also generally
'about 3 inches wide and 8. inches long. The bracket designs were normally based on suppliers' reconmendations and were performed in the mid-1970s. In other cases, the support brackets for lightweight instruments were frequently designed using " good" engineering judgment without detailed calculations for normal operating and seismic conditions. This was the nuclear industry practice at that time.
The evaluation team has reviewed the details of brackets on the design drawings and has made plant walkdowns. The team has determined that the following specific instruments with lightweight brackets and corresponding design details of the 47W600 series-
' drawings are relevant to the concern.
47W600 Series Instruments Drawing No. Detafi -
Foxboro transmitters 19 B
-SIRCO press. diff, switch 21 G
. Conoflow filter '22 C h' Kerotest valve manifold Drain valve 22 23 G
G and H Beckman transmitters 33 B ITT Barton Model 763 293 K The team has also reviewed the structural aspects of these
-brackets. The steel brackets for the instruments are light gage, because the design dead and seismic loads are small. The brackets, therefore, are adequate to support instruments for the design loads. This adequacy was confirmed by the evaluation team
-performing a sample calculation for 1/8-inch-thick bracket for
- Foxboro pressure transmitter No. EllGM.
Instrument brackets are sufficiently strong to serve their design function under the most severe design condition, but they are not immune to abuse. The concern that " constant bumping into, leaning against'and sitting on these brackets / instruments causes damage" is plausible. Such damage was observed and reported on two instrument models in September 1985 at WBN (App. A, 5.h). To alleviate the aroblem, NUC PR at WBN decided to replace the brackets for these r oxboro pressure transmitter models with 1/4-inch thickness instead of 1/8-inch thickness as an enhancement to the original design.
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0574D - 04/13/87
.- TVA EMPLOYEE CONCERNS REPORT NUMBER: 223.2(B)
SPECIAL PROGRAM REVISION NUMBER: 1 PAGE 6 0F 10 At SQN, after reviewing a ifst of Construction and Engineering NCRs and SCRs and after interviewing the responsible cognizant engineers, the evaluation team has not identified any case of reported damage to Category I instrument support brackets. Accidental minor bumping into instruments would not produce significant stresses in brackets and would not cause any permanent residual stresses. Inadvertent mistreatment of instruments and their brackets could, however, produce stresses significantly beyond the elastic design limit. So this-issue, although unlikely, becomes an important plant maintenance issue.
In view of the fact that there is no reported damage to instruments at
. SQN, the evaluation team considers this not to be an SQN restart issue.
TVA had requested Gilbert / Commonwealth Associates (G/C) to review the technical 6dequacy of design changes performed at SQN after the issuance of the operating license. Among other tasks, in March 1986, G/C reviewed completeness of engineering design drawings showing-installation details of locally mounted Category I instruments. The G/C report stated that the drawings did not clearly show the method of fastening the instrument mounting plates to the panel frames. In response to the G/C recommended action TVA has commi 'ed to perform l
field walkdowns of all instrument panel frames suppt ing Category I L instruments and to ensure that adequate fasteners with appro torque values are used (App. A, 5.c, Technical Issue No. 10)priate Lack of typical installation detail drawings was also a subject of another employee concern. Element Report 80501-SQN addressed that concern and also recommended walkdowns prior to restart to verify l
proper installation of all safety-related instruments. TVA has
' committed that the corrective action plan, which is in the planning stage, for element 80501 will also incorporate the requirement that any damage to instruments and brackets be identified in the walkdowns l
(App. A, 7.e).
! Findings:
The alphabetic identifiers listed below correspond to the list of issues in Section 1.
- a. Instrument mounting brackets at SQN are adequate to meet their l most severe design conditions.
l l b. In heavy traffic areas, the issue that the brackets are susceptible to abusive treatment resulting in damage to brackets and instruments is valid.
, c. If the walkdown discloses damaged brackets, they should be l
(.
strengthened or protected.
0574D - 04/13/87
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TVA EMPLOYEE CONCERNS REPORT NUMBER: 223.2(B)
- SPECIAL PROGRAM REVISION NUMBER: 1 PAGE 7 0F 10
- <!l h
Conclusion:
Category I instrument installation at SON meets the FSAR and TVA's design commitments. Inadvertent mistreatment of instruments is a valid plant maintenance issue but.not a design issue. The-evaluation team, therefore, concludes that this is not an SQN-restart issue.
- 10. CORRECTIVE ACTION:
To comply with the plant maintenance requirements, TVA has committed to the following corrective action plan (CAP) (TCAB-085; App. A, 5.k).
TVA DNE will compile a list of safety-related instruments mounted on light-gage brackets similar to those identified in the element.
report. DNE will identify locations of the instruments and consider their susceptability in view of the general traffic pattern. They will also develop and obtain approval for a field walkdown procedure. Subsequently, they will perform the walkdown
,P and identify any deficiencies. As a result, TVA will initiate corrective action for each deficiency and develop stronger mounting details for replacing the instrument brackets.
TVA's CAP, as described, will meet its FSAR commitment for the safety-related instruments at SQN. The evaluation team, therefore, concludes that the stated CAP is an acceptable resolution of the concern and should also preclude its recurrence, i
l i
l 0574D'- 04/13/87
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- TVA-EMPLOYEE' CONCERNS REPORT NUMBER: 223.2(B)
SPECIAL PROGRAM REVISION NUMBER: .1 PAGE 8 0F 10 APPENDIX A
- 5. DOCUMENTS REVIEWED RELATED TO THE ELEMENT:
47W600 Series, revisions as of 09/20/86
- c. Gilbert / Commonwealth, Inc., " Final Report - Technical Review of SQN Modifications," G/C Report No. 2614 (03/03/86)
" Engineering Document Quality," (09/24/86)
" Local Instrument Seismic Qualification," (11/20/86)
' " Instrument Mounting Brackets," (06/03/86)
N
(09/03/85)
- 1. Foxboro Catalog, "N-Ell and N-E13 Series Nuclear Electronic Pressure Transmitters," No. PSS 9-181 A (1983) i-
-j. TVA memo from P. R. Wa11 ace to H. L. Abercrombie, (S53 860418 999), "SQN -_GCTF Finding - Employee Concern No.
! IN-85-463-006," (04/30/86) l 9
- k. TVA letter from G. R. McNutt to G. L. Parkinson, " Employee Concern Evaluation Program - SQN Restart Program - Corrective Action Plan," TCAB-085, (03/31/87) 6.- WHAT REGULATIONS, LICENSING C0ff1ITMENTS, DESIGN REQUIREMENTS OR OTHER l APPLY OR CONTROL IN THIS AREA?
- a. SQN FSAR update through Amendment 3, Section 3.10, " Seismic Design of Category I Instrumentation and Electrical Equipment"
- b. TVA SQN, " Design Criteria for Mechanical Auxiliary Instrumentation Room Panels," SQN-DC-V-10.3, R0
! \.
05740 - 04/13/87
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TVA EMPLOYEE CONCERNS REPORT NUMBER: 223.2(B)
SPECIAL PROGRAM REVISION NUMBER: 1 PAGE 9 0F 10
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APPENDIX A (cont'd) c.- TVA SQN, " Design Criteria for Mechanical Local . Panel for Class I Equipment," SQN-DC-V-10.4, R0
- 7. LIST REQUESTS FOR INFORMATION, MEETINGS, TELEPHONE CALLS, AND OTHER DISCUSSIONS RELATED TO ELEENT.
- a. Review of ECTG Files, Documentation of concern IN-85-973-002, (10/14/86)
- c. Walkdown in the Sequoyah Unit 1 Reactor and Auxiliary Buildings, by the evaluation team on 09/18/86 .
- d. TVA Transmittal #162, Item 4 (12/01/86)
- e. Telephone call from N. Shah, Bechtel, to A. Smith, TVA, IOM 433 (12/03/86) x 05740 - 04/13/87
.. ./
cc,i' TVA EMPLOYEE CONCERNS REPORT NUMBER: 223.2(B):
SPECIAL PROGRAM REVISION NUMBER: 1 PAGE 10 0F 10 CATD List The following CATD' identifies and provides corrective action for the findings included in this report:
223 02.SQN 01 (Findings "b" and "c";.03/25/87) 4 e
9 -1
< 4' 0574D - 04/13/87
.t ECTG Corrective Action Tracking Document
-(CATD)
INITIATION Applicable ECTG Report No.: #2.13 ,1 [8)
- 1. Immediate Corrective Action Required: O Yes ( No
- 2. Stop Work Recommended: O Ye's % No
- 3. CATD No.113 02 - SQhl- O l 4. INITIATION DATE 04 - Il- 87
- 5. RESPONSIBLE ORGANIZATION: T\/ A O d E - Sokl ~
- 6. PROBLEM DESCRIPTION: K QR O NQR Tn henvu +ra F4tc nre a s ka fe% ~ rAated in stru w~'a t b ra c k ets 'o r, su 3'en o+i ble b alousive_ fre_at m ent- re su tbim 4 'in Jo un ap
+o to ra c ke t s .
r, \ O ATTACHMENTS
- 7. PREPARED BY: NAME YLe5M \M 401) DATE: 4 - Il- 8 7
- 8. CONCURRENCE: CEG-H #C C f W*t)J /L-
DATE: 4-6 T1
- 9. APPROVAL: ECTG PROGRAM MGR. DATE:
CORRECTIVE ACTION
- 10. PROPOSED CORRECTIVE ACTION PLAN:
i O ATTACHMENTS
- 11. PROPOSED BY: DIRECTOR /MGR: DATE:
- 12. CONCURRENCE: CEG-H: DATE:
ECTG PROGRAM MANAGER DATE:
VERIFICATION AND CLOSEOUT
- 13. Approved corrective actions have been verified as satisfactorily implemented, i
SIGNATURE TITLE DATE 1686T l- -- -- _ , , ,
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- ECPS120J-ECPS121C
' TENNESSEE VALLEY AUTHORITY - RUN TIME'- 13:58:39'
-REFERENCE OFFICE OF NUCLEAR.PDHER- ' RUN DATE '- ~ 03/19/87-
' FREQUEllCY - - REQUEST.
EMPLOYEE CONCERN PROGRAM SYSTEM-(ECPS) ..
-ONP - ISSS - RHM EMPLOYEE CONCERN INFORMATION BY CATEGORY / SUBCATEGORY-
. SUBCATEGORY 22302 INSTRUMENT MOUNTING. BRACKET- ,
CATEGORY: EN DES PROCESS & OUTPUT.
S
'N 1 REPORT APPL' SUB R PLT 2 SAF RELATED HISTORICAL: CONCERN CONCERN DESCRIPTION. ..
BF BL SQ HB REPORT ORIGIN CONCERN. NUMBER CAT CAT D LOC
-QTC TYPICAL INSTRUMENT MOUNTING BRACKETS CONSISTING 0F.
IN 975-00201 'EN 22302 S HBN 2^ NA 1NNA N SR Y-YSR '
THIN GAUGE, PERFORATED SHEETMETAL CDR SIMILAR MAT'-
T50156 ERIAL)<ARE NOT STRONG ENOUGH TO SUPPORT THE INSTRU.'
MENTS (GENERIC FOR TYPICAL MOUNTS). CONSTANT BUMP-02 MP 70601 S HBN 1N N N N- ING INTO, LEANING AGAINST, AND SITTING ON THESE BR-2 NA NA NA NA ACKETS/ INSTR. CAUSES DAMAGE To BOTH BRACKETS AND I NSTRUMENTS. CI COULD NOT PROVIDE SPECIFIC INSTRUM-
' ENT NUMBERS, LOCATIONS, ETC., BUT STATED ALL.SUCN
- INSTALLATIONS SHOULD BE
SUBJECT:
TO RE-DESIGN. 'THI-S HAS REPORTED TO MANAGER CKNOHN) BUT NO. ACTION HA 1 CONCERNS FOR CATEGORY EN SUBCATEGORY
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