ML20210F992
| ML20210F992 | |
| Person / Time | |
|---|---|
| Site: | Sequoyah  |
| Issue date: | 02/02/1987 |
| From: | Stewart D TENNESSEE VALLEY AUTHORITY |
| To: | |
| Shared Package | |
| ML20210F779 | List: |
| References | |
| CO19201-SQN, CO19201-SQN-R06, CO19201-SQN-R6, NUDOCS 8702110202 | |
| Download: ML20210F992 (50) | |
Text
r TVA EMPLOYEE CONCERNS REPORT NUMBER: C019201-SON SPECIAL PROGRAM REPORT TYPE: Sequoyah Nticlear Plant Element REVISION NUMBER: 6 (Finni R* port )
TITLE: Conduit PAGE 1 0F 11 REASON FOR REVISION:
Revised to include TAS and SRP comments Revision 2 Revised to include SRP concent s and t inalize report Revision 3 Revised t.o include SRP and TAS comments Revis' ion 4 Revised to include SQN response and l'inalize report Revision 5 Revised to include TAS and SRP editorial comments and Revision 6 finalize report PREPARATION PREPARED BY:
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1.11 11 8702110202 870205 PDR ADOCK 05000327 P
TVA EMPLOYEE CONCERNS REPORT NUMBER: C019201-SQN SPECIAL PROGRAM REVISION NUMBER:
6
.PAGE 2 0F 11 l.
INTRobuCT10N Eight concerns (cat egortzed below) were evaluated at Sequoyah Nuclear Plant (SON) as a restilt of t he Renaric applicability determination resulting trom 1he Watts har Niiclear Platit (WbH) Employee Concern Task Group (ECTGs Element Report Conduit. C019201, within the Corist ruct ion Category.
TN-85-512-003 Quality of Conduit Materials IN 512-002 IN-85-341-001 Torquing of Flexible Condinit Couplings OW-85-00 /-008 TN-85-138-001 Condulet Cover installation IN-85-201-003 Excessive Conduit bends TN-85-850-004 EX-85-Oeb-002 No related sit e specific concerns were identified. Additionally, due to the browns Ferry Nuclear Plant (BFN) evaluation, flexible conduit inst allat ion deliciencies restilting from the generic implicat ion of Signit icant Condition Report (SCR BFNEEB 8632) are addressed.
11.
SUMMARY
OF PERCF.IVEb PROBLEMS (a) Quality of conduit mat erial may not be assured at the time of receipt and maintained through proper storage techniques.
(b) Site procedures for the installation of flexible conduit may not require proper tightening of the couplings which contributes to loose and damaged flexible conduit. Additionally, site procedures may not have adequately addressed flexible conduit installations related to seismic and thermal movement considerations.
(c) Control methods may not be in place to prevent dirt and debris from entering conduit bodies while condulet and pull box covers, etc., are removed.
(d) Allowable cable side wall pressures may have been exceeded resulting from excessive conduit bends between pull points.
TVA EMPLOYEE CONCERNS REPORT NUMBER: C019201-SQN SPECIAL PROGRAM REVISION NUMBER:
6 PAGE 3 0F 11 111. METHODOLOGY (a) Reviewed Quality Technology Company (QTC) expurgated files, as well as other files for additional pertinent information, reports and any corrective action recommendations available on concerns.
(b) Reviewed the WBN ECTG Element Report Conduit (C019201), applicable sections, to determine the applicability to SQN.
(c) Sequoyah Standard Practice SQA-45 was reviewed to determine the procedures implemented for receipt inspection and storage requirements for permanent plant material.
(d) Reviewed Administrative Instruction AI-11. " Receipt Inspection.
Nonconforming Items. QA Level / Description Changes and Substitutions". Revision 37, to determine the inspection requirements for noneritical systems, structures and components (non-CSSC) items.
(e) Reviewed Administrative Instruction AI-36 " Storage. Handling, and Shipping of QA Material". Revision 9. to determine the storage requirements related to conduit material and ensure compliance with American National Standards Institute (ANSI) 45.2.2-1978.
(f) Discussions were held with cognizant Power Stores Unit (PSU) supervision personnel to identify any related quality problems associated with condulet materials.
(g) Walkdowns were conducted with PSU warehouse personnel to observe actual storage facilities.
(h) Cognizant Division of Nuclear Quality Assurance (DNQA) personnel were interviewed to determine receipt inspection and surveillance requirements for conduit materials.
(i)
M&AI-6, " Installation of Conduit and Junction Boxes", Revision 6 was reviewed to determine the tightening requirements for flexible conduit couplings.
(j) Discussion was held with cognizant Modifications and Additions Unit (M&A) Engineering personnel related to tightening of flexible conduit couplings.
TVA EMPLOYEE CONCERNS REPORT NUMBER: C019201-SQN SPECIAL PROGRAM REVISION NUMBER:
6 PAGE 4 0F 11 III. METHODOLOGY (continued)
(k) Discussion was held with cognizant Division of Engineering (DNE)
Central staff personnel to discuss the generic application of SCR BFNEEh8632 and the adequacy of the policy memorandum from W. S. Raughley to Those listed dated May 14 1986.
(1) Discussion was held with cognizant DNE Electrical Engineering (EE) personnel to discuss the movement requirement for flexible conduit installations for floor mounted equipment.
(m) Discussion was held with cognizant DNE (site) EE personnel to discuss the minimum length requirements of flexible conduit connections for floor mounted equipment.
(n) Reviewed M&A Instruction M&AI-6. Revision 6 to determine the procedure requirements related to condulet cover installations and craft surveillance instructions for identifying damaged or defective conduit components.
(o) Discussions were held with cognizant M&A Unit Engineering and I
craft personnel pertaining to condulet cover installation.
l procedure clarifications related to excessive conduit bends, and IR6 craft training with emphasis on G-40 requirements and guidelines I
to prevent the installation of damaged conduit components.
l (p) Discussions were held with cognizant DNE EE (site) group leader to determine what actions SQN had taken to identify and resolve problems associated with excessive conduit bends.
IV.
SUMMARY
OF FINDINGS (a) Review of the QTC expurgated files and other files revealed no additional pertinent information than that discussed in findings below.
(b) The WBN ECTG Element Report Conduit (C019201) contained i
sections which related to material problems. loose flexible couplings. fish tape and debris, and excessive conduit bonds which were pertinent to the SQN evaluation.
(c) Sequoyah Standard Practice SQA-45. Revision 21 stated "The power stores and QA staff supervisor are responsible i
for the receipt and receipt inspection as defined in AI-11 l,
(reference paragraph 17.D. page 59).
Additionally, paragraph 19.D page 59 states. " Handling, storage, and shipping shall be in accordance with the requirements of AI-36."
l
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TVA EMPLOYEE CONCERNS REPORT NUMBER 2 C019201-SQN SPECIAL PROGRAM REVISION NUMBER:
6 PAGE 5 0F 11 i
IV.
SUMMARY
OF FINDINGS (continued)
(d) Administrative Instruction AI-11, revision 37 stated "PSU clerks shall receive non-QA and/or non-CSSC items." No guidelines are established to describe what constitutes acceptable material or what actions are to be performed if defective materials are delivered, i.e.;
over, short, substitute, damaged, or defective (OSSD or D) items.
(e) Review of Administrative Instruction AI-36, revision 9, indicated the storage levels as specified are in compliance with the appropriate ANSI Standard (ANSI 45.2.2-1978) and conduit bodies are stored as Tubular products which require level D storage.
(f) Discussions with cognizant PSU supervision personnel indicated no quality problems had been identified with conduit or conduit fittings.
(g) Walkdowns with PSU personnel of Level D storage areas for conduit bodies revealed scattered surface oxidation (rust) on some conduit bodies with more severe rusting at the threaded area.
Approximately 1 to 2 percent of the conduit bodies were judged not acceptable for installations-assuming the entire length would be installed.
The storage area and placement of material were in compliance with the requirements of Level D storage as specified by ANSI 45.2.2-1978.
(h) Discussion with cognizant DNQA personnel indicated receipt inspection was performed per the requirements of AI-11 and surveillance activities were in accordance with the frequencies specified in Surveillance Instruction Letter (SIL-181). Level D storage areas were subject to surveillance activities performed by QA.
No known quality problems with conduit or fittings had been identified.
(i) Review of M&AI-6, revision 6 revealed installation of conduit and conduit systems were performed in accordance with the National Electric Code and flexible metal conduits were installed l
in accordance with the specific instructions included in paragraph 3.2.6 which adequately addresses the tightening requirements of the flexible conduit coupling.
Verification is performed by QA personnel (Reference paragraph 4.0 item E).
No deficiency was noted.
(i) M&A engineer stated that loose couplings on flex conduits had not been encountered during installation inspections.
l L
TVA EMPLOYEE CONCERNS REPORT NUMBER: C019201-SQN SPECIAL PROGRAM REVISION NUMBER:
6 PAGE 6 0F 11 IV.
SUMMARY
OF FINDINGS (continued)
(k) Discussions with cognizant Central Staff personnel revealed SCRBFNEEB8632 to be potentially generic to SQN as related to the lack of guidelines for flex conduit installations contained within General Construction Specification (G.C.S) G-3.
lR6 The policy memorandum from W. S. Raughley to Those listed dated l
May 14, 1986, was determired to be fully adequate to address the l
flexible conduit issues related to the Code of Federal Regulation Section (10 CFR 50.49) pipe mounted devices, and all 10 CFR 50.49 equipment, such as motors and chillers, at a point 6 feet or greater above the floor level. However, floor mounted 10 CFR 50.49 equipment at a point less than 6 feet above the floor level was not addressed and is considered inadequate in this respect since a minimum length of 18 inches is required for flexible conduit to allow a one inch movement. No objective evidence was found which ensures this 18 inch criterion was met during flexible conduit installations.
(1) Discussions with cognizant DNE EE personnel revealed 10 CFR 50.49 floor mounted equipment below a point 6 feet above the floor level would be acceptable, provided the flexible conduit minimum length is 18 inches, to accommodate one inch movement during a seismic event.
(m) Discussions with cognizant DNE EE personnel revealed that before the issue of G.C.S-G40, revision 0, dated August 6, 1975, no minimum length criteria had been established for flex conduit installations.
It was noted however, that N2E-860, revision 0 issued November 6, 1973, required a one inch movement with no length given. Before this date, G.C.S. G-3 was utilized and consequently could have resulted in flexible conduit installations which do not conform to the requirements of G.C.S G-40 nor the 18-inch minimum length criteria for floor mounted 10 CFR 50.49 equipment.
(n)
M&AI-6, revision 6, does not address the installation of condulet or pull box covers to prevent dirt and debris from entering the conduit between cable pull activities, or for the initial I
installations of conduit bodies.
Also, the procedure contains no guidelines for the craft to assure that damaged or defective conduit components are not installed.
I (o) Discussions with cognizant M&A engineering and craft supervision indicated recognition of the need for procedural clarification in regard to covering all openings in the conduit run by either permanent and/or temporary means. Additionally. it was l
l recognized that paragraph 3.1.1 of M&Al-6 should contain a l
precaution to the installer not to exceed 360 degree accumulations l
of hends betwoon pull point s in the conduit body, and verification l
1
TVA EMPLOYEE CONCERNS REPORT NUMBER:
C019201-SQN SPECIAL PROGRAN REVISION NUNBER:
6 PAGE 7 0F 11 should be performed by QA personnel. It was also noted that no l
formal training by TVA was in place to ensure the craft were IR6 familiar with the G-40 requirements and good practice methods to l
prevent the installation of damaged or defective conduit components.
I (p) Discussion with cognizant DNE EE Unit Conduit and Grounding Group revealed that walkdowns controlled by Special Naintenance Instruction SMI-0-317-32 were performed by SQN to identify excessive conduit bends. A sample of 16 worst-case conduits using the criteria of multiple bends (>360'), long lengths, elevation changes, and conduit overfill (>30% full) were chosen for evaluation. No conclusive evidence has been documented to show that sidewall pressure or pull tension criteria has been violated at this time.
==
Conclusions:==
(a) No guidelines are established in AI-11 to define what constitutes acceptable conduit and fitting material or what actions are to be taken if defective materials are delivered. No quality problems with conduit or conduit fittings have been documented, therefore, Employee Concerns IN-85-512-002 and IN-85-512-003 were determined to be not factual.
(b)
M&AI-6, revision 6, the controlling procedure for conduit system installation, adequately addresses flexible conduit coupling tightening requirements.
Employee Concerns IN-85-341-001 and OW-85-007-008 were deemed not factual because the governing procedure is explicit in its inspection requirements for conduit fitting installations. M&AI-6 is inadequate by not requiring the installation of condulet or pull box covers to prevent dirt or debris from entering the conduit between cable pulling activities.
Employee Concern IN-85-138-001 was considered factual. M&AI-6 is also inadequate by not containing instructions to the craft to prevent the installation of damaged or defective conduit components.
(CATD C019201-SQN-06)
(c) The requirements for flex conduit installation for 10 CFR 50.49 pipe mounted equipment and floor mounted equipment as stated in G.C.S G-3 inadequately addressed minimum lengths required to accommodate thermal and seismic movements of the equipment. Current requirements for flex conduit installation as stated in G-40 does accommodate seismic and thermal movement considerations. The potential for imposing unqualified stress to pipe mounted devices or floor mounted equipment by over-extending flex conduit during thermal and/or seismic movement of the pipe or equipment and the subsequent stresses imposed on the cable inside the flex conduit installed prior to the issuance of G-40 should be evaluated by DNE.
TVA EMPLOYEE CONCERNS REPORT NUMBER: C019201-SQN SPECIAL PROGRAM REVISION NUMBER: 6 PAGE 8 0F 11 (d) It was concluded that conduit runs containing more than 360' of accumulated bends between pull points were installed at SQN.
Therefore, the Employee Concerns IN-85-201-003 IN-85-856-004, and EX-85-066-002 are considered to be factual.
DNE is evaluating the findings established during the walkdowns governed by SMI-0-317-32.
Reference SQN Element Report C010900 for further details.
lR6 (e)
M&AI-6, revision 6 does not include provisions to cover all openings in the conduit runs, by either permanent or temporary means, to prevent dirt and debris from entering the conduit body and is considered inadequate in this area. Additionally, no precaution to the installer of the conduit run exists which prevents exceeding 360 degree accumulations of bends between pull points within the conduit body.
No quality assurance inspection exists which ensures excessive bend criteria are not violated.
Employee Concerr.s IN-85-138-001, IN-85-201-003, IN-85-856-004 and EX-d5-066-002 are valid because of the controlling procedure deficiencies noted above.
Reference Construction Category C010900 lR6 Element Report for SQN for details on DNE's evaluation of sidewall pressure tests and multiple bend criteria results and details on SON's walkdowns.
V.
ROOT CAUSE (a) AI-11 was inadequate in that nonsafety-related items were being received by nontechnical personnel without guidelines established to require the exe.minations which detect burrs, sharp edges, flattened threads or irregularities detrimental to the installation of cables during pulling activities. The apparent cause of this deficiency is management oversight resulting from the lack of awareness that defective "nonsafety-related" items such as conduits and fittings may have a direct impact on plant operation or safety-related features such as cables.
(b) Because of an oversight by the DNE preparer / reviewer or the lack of consideration for the required Safe Shutdown Earthquake and interface movement criteria, General Construction Specification, G-3 did not provide guidance for installing flexible conduit offsets, lengths, and thermal / seismic movement allowances.
The attempt to correct the movement criteria for floor mounted equipment as contained in Sequoyah Specific Construction i
I Specification N2E-860 was inadequate in that the movement criteria for this floor mounted equipment as established by DNE, contained-insufficient qualifying instructions for utilization during installation.
In conclusion, the design criteria were not established or conveyed to the responsible construction organization in a manner which would ensure the proper installation of tioxible conduit as sembli e::.
I
TVA EMPLOYEE CONCERNS REPORT NUMBER:
C019301-SQN SPECIAL PROGRAN REVISION NUMBER:
6 PAGE 9 0F 11 V.
ROOT CAUSE (continued)
(b)
(continued)
The need for establishment of these specific criteria may not have been recognized by DNE personnel.
It should also be noted that the established program for generic applicability determination is deficient or weak in that significant conditions-such as those identified on SCR BFN EEB 8632 (related to this issue) remained unidentified at other plants largely because of this generic applicability determination being performed by the initiating organization with limited knowledge of the generic implications.
(c) DNE specification writers had not recognized the importance I
of establishing a procedural control program to prevent dirt IR6 and debris from entering the conduit or to ensure good I
workmanship practices were utilized during conduit installation.
l This type of requirement should have been a part of the specification I in use et all TVA sites.
I 1
2 (d) Because of the lack of underatanding of/or an oversight by the IR6 preparer and reviewer, General Construction Specification G-40 issued by DNE did not restrict conduit bends in excess of 360 degrees between cable pull points as required by the National Electric Code. This action resulted in inadequate installation criteria supplied to DNC which allowed the potential for excessive bends between pull points to exist during conduit system
.I installation.
Reference Construction Category C010900 Element Report for SQN.
VI.
CORRECTIVE ACTION f
The following CATDs led to the following Corrective Action l
Plans (CAPS) from SQN Line Management.
CATDs C019201-SQN-01 through 05 are restart items.
CATD C019201-SQN A memorandum from D. W. Wilson, Project Engineer, Sequoyah Engineering Project, to Z. M. Kabiri, Manager, Site Services, on October 21,1986 (RIMS //B25 861021 039) requested that Administrative Instruction AI-11 be revised to include specific guidelines for receipt inspection of non-QA/non-CSSC items with emphasis placed on the quality of conduit material and accessories.
l l'
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TVA EMPLOYEE CONCERNS REPORT NUMBER: C019201-SQN SPECIAL PROGRAM REVISION NUMBER:
6 PAGE 10 OF 11 CATD C019201-SQN Sequoyah Engineering Project Electrical Group Number 2 is presently performing a field walkdown of flexible conduit installations according to Special Maintenance Instruction SMI-0-311-33, dated August 11, 1986. Work Requests (WRs) lR6 will be written to correct any discrepancies discovered.
CATD C019201-SQN A memorandum from D. W. Wilson, Project Engineer, Sequoyah Engineering Project, to R. W. Olson.
lR6 Modifications Manager, October 21, 1986 (RIPS B25 861021 040) requested that M&AI-6 be revised to provide instructions to cover all openings in conduit runs to preclude dust, dirt, and debris from entering the conduit system during installation activities.
CATD C019201-SQN A memorandum from D. W. Wilson, Project Engineer, Sequoyah Engineering Project, to R. W. Olson, Modifications Manager, October 21, 1986 (RIMS B25 861021 040) requested that M&AI-6 be revised to include precautions for the conduit and cable installers to prevent installation of bends in excess of the 360 degree maximum accumulation between cable pull points and to require QA verification of compliance.
CATD C019201-SQN-05 Sequoyah Engineering Project Electrical Group Number 2 is presently performing a field walkdown to identify conduits with multiple bends between pull points which would cause excessive sidewall pressure according to Special Maintenance Instruction, SMI-0-317-32, dated June 20, 1986. Any violations found that have potential safety impact after complete evaluation will be documented in accordance with SQA 118 and Work Requests (WRs) will be written to rework the configuration of the conduit system and install new cables.
CATD C019201-SQN-06 SQN DNC Modifications will review the requirements of M&AI-6 with emphasis of G-40 to all DNC electricians.
This CATD is not a startup item.
l
(
VII.
GENERIC APPLICABILITY Violations in cable side wall pressure because of excessive conduit bends are potentially generic to BLN_and BFN.
Additionally, the lack of inspection requirements for condulet cover installations, flexible conduit couplings, and quality of conduit materials are potentially generic to BLN and BFN.
Issues pertaining to Flexible Conduit Configuration as described in SCR BFN EEB 8632 may be generically applicable to WBN.
TVA EMPLOYEE CONCERNS REPORT NUMBER: C019201-SQN SPECIAL PROGRAM-REVISION NUMBER:
6 PAGE 11 0F 11 VIII. ATTACHMENTS A.
SCR BFNEEB 8632 B.
Policy memorandum from W. S. Raughley to Those listed dated May 14, 1986 s
C.
Listing of concerns indicating Safety Relationships and Generic Applicability t
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The installation of flexible co.nduit was not specifically addressed in Genorcl
%ji Construction Specification.G.- b The lack. of guidance for installing flexible 6
conduit offsets, lengths and thermal / seismic movement allowances creates
.E uncertcinty ss to whether instclied flexible conduit can perform it's safety
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Tabulate Data on All Failed and/or Af fecteo Comronents, Structures. and Systems: Give descriptions, model and tranuf acturers' nemixrs, and or:grui anc resine ocsip criteria anofor specitscations. (Sce fJose 5.)
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l 2.
Failure Mechanisms of Affected Components. Structures, and Systems: State whether each affected component, structure, and system became open or closed, inoperative, or snorted;or had shortened life, reduced accuracy, increased drift, reduced capacity, etc. (See Note 6.)
s 3.
Alternate Uses and Generic Implications: Identify alternate uses of the components, structures, and systems in the plant. Discuss generic implications. (See flote 7.)
4 l
4.
Comoonent. Structure, and/or S/ stem Failure Mode (s): Give description and cxtent of effects of failurcs on each component, st ucture, anc/cr syst:m invcive::. (Sx t.cte 8.)
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f;CitP RIEEP" W c-Cs o Sm,3 Tho installation of flexible conduit was not specifically addressed in g,,n,t ve Statements of CAO 1;,e* Note 13 u
- 5 General Construction Specification G-3.
The lack of guidance for 6
installing flexible conduit. offsets, lengths and thermal / seismic rnove.e.ent allowances creates uncertainty as to whether installed florible 22 conduit ccn perfor:. it's sciety function.
'See Note 2 on pace 4 for comoteling Part 8.Part B conianued on pages 2 and 3*
Due Oste of Fa>3ure Evaluation
) es (OL f.u: ear l'.s.r.ts Cnly)
Preperstion of Failure No Eva:uetion is required?
FSAR Revision Required?
Yes No Conclusions (See Note 3.1 e
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- u. O c2 Recommendations (See Note 4.)
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l WA 103% (ONE44G) ce; rm.es,
(;ut-Tut to RIMO es stennaicr.a cocument.)
3.-~.
gtsor, test resu.t> sho*pr.,. ca.i;ornr% an:.,o.- f.:.ure t:. niec. orsir,c'ater ed esie-o pustnea: sD'cmatsons incwoe cifcti?atten'.. analysis results, tlst rzsults, and/or purchase rIouiremInts n31 rmt, or othIt bases. (Sea Note 9.)
i 8.
Consecuences on Plant Design Functions: Discuss effects of failures on all involved component's. structure's. and system's ability to perform their plant design functions. (See Note 10.)
s o
7.
Justification for Conclusions in Failure Evaluation: Discuss the reasoning based on the information above which leads to the conclusions stated. (See Note 11.)
{
Prepared By and Date Cecrdinated in Site Director's organization with:
ll Verified By and Date l Dinip:ine Lead Enginecr(s) and Date i
Approved 6y and Octe
{i a
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,0 l' f's Hay 14,1986
) ! ~ W,.
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ELECTRICAL ISSUES - FLEXIELE CONDUIT y w f,
4
'{.
The purpose of this nc=orandum is to provide guidance for ecch Lead
~
Engineer te deterciae the adcquacy of flexible conduit lengths for ther=al I
and seis=ic =ovement ICCFR50.49 lists.
for installed Class IE equipment and devices on the
" '~
General Construction Specification G-40, presently defines the =ini=u=
i flexible conduit length for thermal =ovement based on conduit size (Section j
3.2.6.3) cud seis=ie =ovement (Section 3.2.6.2).
incorporated into G-40 as outlined in Attachment 1.These requirements were In Janucry 1986, it was discovered that some flexible conduit at WEN was not installed in accordance with the requirements of G-40.
Further study has revealed that thermal =ovements for pipe-=ounted devices and seis=ic
=ove=ent for certain floor-=ounted equip =ent was not based on vorst-case conditions.
"Seis=ic/Ther=si Movc=ents.- Class lE Electrical Condui:" (54
' defining the maxi =um, vers e.,, case _seis=ic/ thermal =ove=ents' for all plants V(Attachment No. 2).
=ay be used to evaluate =ov2=ents for each plant,The values in this calcu or specific =ove=ents for each piece of equipnent or device =ay be obtained. The seis=ic and ther=al
=ove=ents f or pipe-=cunted devices are shown in lead tabuletions and iso =etric drcvings which can be obtained fro = DNE - Civil Engineering
} l Eranch and een be used to identify seis=ic/ther=cl pipe move =en:s which eneced the 1-inch cri:eria fer evclucting devices en a case by case basis.
The origin:1 recpe cf thic item ves to only look at devices on mechanical syste=c which had not been ther=cily enercised to their li=it; however, j
since the plcnts have :::
devices cre in questien.
enperienced a seis=ic event, =ove=ents for cl1 i
j
- sed on preli=incry inf or=ctic: frc= RENP, the problem of short flenible
- cendui:
lengths for pipe-=ounted devices or flocr-=ounted equip =ent door not appear Oc be entensive.
~
The follering cource cf a:: ion shall be taken to resclve the flenible cen;uit icsue:
1.
All ICO R50.*9, electrically-eperated, pipe-=ounted devicec t!.c:
'enperience =cvenent be intp2:ted per the flenible conduit require =ectc of SRN-G-40-Il (A :a
- --a-- 3).
~ _ _
- .. rctic= cceple of IC0FR50.3G ele :ricclly-operated, pipe-=ounted devicec that enperienec =cve=ent, of 1 inch or lets ch:11 be inspected'
~
per !'IL
~T' 10!D bcced en a St cenfidence fcctor.
I t,-
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s
.,y.g.,....
,, ! o > +m a listed p' f;,'( r;r Those
~.,,
1:cy I, I M O Iffb ELECTRIC ISSUES - FLEXIBLE CONDUIT
- i 1..%..,
b.
~
3.
All ficxibic conduit connected to floor-counted caot or forged 3
10CFR50.49 equipment, such as motors and chillers, at a point six feet J'
or greater above floor level shall be inspected to assure that_ the ficxibic conduits meet the requircmcuts of SRN-G-40-11.
/g If the inspections reveal unseceptable installations, the flexible conduits I
shall be documented and reworked, replaced, or referred to DNE for disposition on a case-by-case basis.
The fragnet for resolving the flexible conduit issue is Attachment No. 4.
This effort should be started im=ediately to expedite co=pletion of the f
flexible conduit issue'.~
i W. S. Raughley L'3 J. D. Cellins, ?-110 SI-K \\
G. T. Hall, DNE, DSC-A, Sequoyah H. C. Rutherford, A7-BFN ENG
\\_
J. L. Springer, 9-111 SB-K DLL:IB
.n:4.
076120.09 e
f 4
60 v.
. m.m, m ims ~m.mm Yz,- -
TABLE A' SEISt!IC/TIIERffAL !!0VEf!ENT FLOOR-!!OUNTED EQUIPl!EliT AllD DEVICES PIPE-MOUNTED ' DEVICES * *v..'
I'It0J EC T S EET llETA1, CollST.
lloi!I7. !!OVI.t!E!10 (It!.)
CAST OR FORGED EQUIPilEllr fl0VEffEllr IN ALL -
CONflECTIOli 11ElGitT 110RIZ VERT -
DIRECTIO!!S (IliCIIES)
Efil
.5 5 3 Feet 10.75" 10.15" 13.6 5 6 Feet 11.25" 10.31" 5 9 Feet
__2.0"
_4 0. 5"
+
59:1 15 Same as DFil 14.0 I
WUli 15 Same as DFN
~
14.0 5
BI N
.5 Same as BFN 13.7 9
0 e
8' g.
.. ns n mus
.- 1 I
].'
Fage I of 2 V
SQN (CF 5-27-70), VEN (CP l-23-73), and EI.N (CP 12-21.-74)
Electrical Cable Issues F.
a Issue: Flexible Conduit Connections to Class IE Equip =cnt DNE Document "iee Frame (Sectioni D!TE Rac uire-ent i
Use length of flex. conduit (Section 2.5) to r.llov 1-inch movement in all directions connecting to Class 1E equipment.
end 8/6/75 G-40 P4 thru E2 I
to 10/21/80 (Section 3.2.6)
Use minimum 18-inch length of flex connecting to Class IE equipment.
10/21/80 to G-40 R3 thru G-38 R9 1/15/86 (Sect. 3.2.6)
Above plus addressed flexible conduit connections to ther=al (pipe) movements.
1 t
C6C120.03 C22: l,-30-86 O
h p
i Page;(,of;L.
ITN (CP S-10-67)
Electrical Cable Issues s,,
6 Issue: " Flexible Conduit Connectiour to Class IE Equip = cut LHE Document DNE Tierr F rs=e (Section) t Recuire=cet
'5/10/67 to G-3 issued
.b-1/15/86 12/17/62 and Provide flexible.
conduit connections later revisions to equipment (such (Section B.10) as motors, valves, lighting fixtures).
g No specific require-ment for min. lengths of flexible conduit relative to seismic and ther=al (pipe) 1 movements.
1/15/86 to G-40 R9 Addresses type of 3/17/86 (Sect. 2.3 flexible conduit cud 3.2.6) and lengths (per size conduit) relctive to ceic=ic cud ther:a1 (pipe)
= ve=ents.
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LAPtSEOilONiSI UNIP L YSii8'lL)
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Revision O R1 R2 i
R'l Statement of Problem ECN No. line: Ate if Nct Apcl. cable)
This WcuWiow h needed b
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TABLE OF*CO!;TEh7S - Change the titles of sections I.4, 3.2.6.2, 3.2.6.3, and 4.0 to read:
. e-1.4 Definitions 3.2.6.2 Floer-Mounted Ecuipment end Devicec, Seiscie Movement Considerations in Seiscie Cater.orv 1 (Class I at BFN) Structuren 3.2.6.3 Pipe-Mounted Devices. Therunl/Seis=ie Movement Considerations 4.0 DIVISI0N OF NUCLEAR CONSTRUCTION /0FFICE OF NUCLEAR POWER QUALITY C PPIFACE - Change the first paragraph to read:
... future nucicar plants. This specification also applies to future modifications and their subsequent maintenance activities at Brovns Ferry Nuclear Plant (BFN) in accordance with N. R. Beasley's c:ecorandum to G. R. Hall dated January 15,1986 (B22 860115 015). 'This specification may be used...
Sectien 1.2. Pare 1 Change first paragraph, first sentence to read:
N It ic the re.pencibilit: cf the Diticie cf Nuc'.ccr E=;;incerin;; (0:?2) to prcparc.
Section 1.2, Pare 1 Change last paragraph, first sentence to read:
It shall be the joint responsibility of DNE and the Division of Nuclear Conctruction (NU CON)/ Office of Nuclear Pcver (ORP) to recced.
Fe--i-- 7.1.
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'Cht:gs to rc:d:
TE: :2 Ele:: ritz.1
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- t (ICE) Centrti S:cff is rc:porcible
": cr :.Lc cc ::::s cf :hir cc stru:tica specifier ice.
i~.' CON cr the O!'? c it c dirc::c: ic re:p :cible fer c:fer:in; the rer,uirc c :s cf this generti c::::rn: tic: :: ::if ic c t ic a.
le - H 1,?
ee 1 ~ - Cht:;t ti:1c ::t add definiti::.
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i: -: uci..c c ::::crrc : Eft "h.::dar Ec r t h q u c ht. (SSE).
. _n. n
t E4S-G-40-11 Fage 2 of 10 Sefacie Caterorv 1(L)(Class II at BFN).
Those portions of structures, systems, or components which perform secondary safety functions to the extent that only li=ited structural integrity is required.
~7 designed and constructed to oneure achievesent of their li=ited structurcl They are integrity at cil times including a concurrent SSE.
_ Safe Shutdnvn Eartbouake.
An carthquake which produces the arrimum vibratory ground motion for which structures, syste=s, and'co=ponents which perform a primary safety funciton are designed to remain functional.
Section 2.2. Pare 2 Change to read:
Major materials and those of a special nature used in the installation shall be designated on DNE detailed design.
Section 2.3. Pare 2-1
' Change first paragraph, last sentence to read:
.. flexible conduit, and other =inor materials necessary for installation but not requisitioned by DNE.
_Section 2.3. Pace 2 Change first pcragraph, last sentence to reed:
ENE cpproval for their use is contingent upon the following:
_Section _2.3. Pace 2 Change third paragraph, second sentence to read:
The follaving types of stainless steel fic=ible conduit are acceptchie for these applicctions:
ServicAir Cc=pcty SS50, SS63, er SS630 ceriec, loc, Inc.,
er L=cricc:
type USI-0 er HII.-l rcriec, er equcl.
Par:irr *; r r e :-? - Chc gt first pcr:grcph, fir:t sentence to recd:
?re:sure-:ight etciclesc tee; ficrible cc duit (ScryicLir SS530 e:trc ficritic ctcialect ctec1) cs defined :: :Le reeptetive project's design drnvinge ::d ct cpproved fer u:e by 0::E, chcil bc uced fer itctcilcticer there c ic recuired.
equip cat cec; Ca-tier 2,*
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Pcge 3 of 10 Sec t ion 3. 2.2. l'a r_c 3 Change to read:
s L
If interfirences occur, the EU CON /0NP clectrical engineer shall...
section 3.1.3. Pere 3 Change first sentcuce to read:
. pro =ptly, the DNE project shall be consulted for concurrence after NU CON /0NP has coordinated.
Section 3.1.2.3. Pace 3 Section is incorrectly numbered.
Chcnge to rend 3.2.1.3.
_Section 3.2.2.2. Pace 3 Change second' paragraph to read:
s In seismic Category I (C1' ass I at BFN) structures, exposed conduits shall...
Section 3.2.2.4. Pace 3 Change first sentence to read:
In nonseismic Category I (Class I at BFN) structures, galvanized steel me=bers may...
l Sectior 3.2.2.8. Pr.ce 3 Chc:ge cc:: d cc :ence to rccd:
The conduit interconnecting the two conduit bodies shall be sized by NU CON /0N?
in accordance with DS-E13.2.4.
Section 3.2.4.2. Pare 3 Change last centence to read:
b
/.: cic::ri::12y cc:du::ive, cc:irci:c cc=peu=d f r tet:1 curicce: (Th:::c ctd Latt: C::pcr; "P.cpr-Chicid"; Jc
'ube, Incorper:ted "C5-20"; lur:dy "Penetre:
E"- 3r cc,u;vsic::) chn11 te :pplied c the = tic Oc duit thretas.
S utier 5.*.4.4
?rra 3 c - Chce e first sent::ce to recd:
.c:leid:i tpp'i:ntic s i: :: ccit-i: 0::c;ery I (Cic c I c: ITN) cffi:e ::d
- rvice bu Idit;c.
Fr::ier 3.2.6.'
' ace " Ch:::e fir : ;:rcrrtph, fire: sc:tct:c to retc:
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i Sg3 c_40 11 Page 4 of 10 Section 3.2.6.1. Pare 3 Change second paragraph to read:
Flezihle"*Ecoduit shall be installed between conduit fittings in exposed lengths not czceeding 72 inches, except as noted on design drawings.
(For exceptions not noted ou decign drawings contact DNE project for resolution.) Eigid conduit chall be located as near the equipment and device as practical. The flexible conduit shall be prepared, asse: bled, and installed in accordance.with manufacturer.'c instru:tions, including any torquing requirements where applicable. The minimum recommended bend radii given in Table 3.2.6-1 shall not be violated.
Flexible conduit shall be installed without twist and should be oriented avey fro = heat radiating sources, such as a hot pipe cud its insulction. After installation, the flexible conduit shall not be tight or stretched between flexible conduit fittings.
Section 3.2.6.2. Pare 3 Change the title of section 3.2.6.2 to read:
i 3.2.6.2 Floor-Mounted Ecuie=ent and Devices. Seiscie Movement Considerations in Seistic Caterorv I (Class I at EFN) Structures Section 3.2.6.2.1. Pace 3 Re=ove section number "3.2.6.2.1" sud change the first paragraph to read:
tri:;.
.:.lcv fer relc:ive dicplacement of equip =ent or devices and a rigid condui: system. To ensure.
floor-counted equipment and devices (such as cotors.
Sectien 3.2.6.2.1(a). Pares 3-12 and 3 Change to read:
4 (c) Phc: cc:duits ec::e:: to the : p of cei:=ic C::c; ry I (Clect I c: 272) er C:tegcry I(L) (C.'cc: :: c: ITU) f'.cor-custed equip =ent cud itvices, :: 15-inch minitu: c: posed ict;;h :f fl: ible ec dui: sh:11 be inc::11cd be:ve:-
the fl :::le :::dui-fitti ;r inc:ciled c the rigid ctduit :cupling c=d the equipten: er devi:e. The c::u 1 ticicut eenduit len;;h receired for c p::ticulcr in:::llctic: shall be cc cpecified on decign d::vings er ac Ocleul:te. by 1T* C05/0:0 u:i ; the equctic i: Figure 3.2.6-1.
Chic
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r S EF-G-40-11 Page 5 of 10 Section 3.2.6.2.1(c). Pace 3 Change to read:
Ifloor-counted devices, such as motors, (c)
...to accec=odate its mini =um bend radius.
(See Table 3.2.6-1.)
^
Section 3.2.6.2.1(d). Pace 3 Eeplace with the following:
(d)
In cases ubere f1exible conduit is used for alignment purposes only and both ends of the f1crible conduit are rigidly attached to the same seis=ic structure, the relative displacement between ends is zero and therefore from thermal / seismic conciderations.
exe=pt Section 3.2.6.2.l(e). Pare 3 Add new section.
(e) Conduit connections..to cable trays should be avoided; however, if conduits arc connected to seismic Category I (Class I at BFH) cable trays, en 18-inch =inimum length of flexible conduit shall be installed as in (a) above.
Section 3.2.6.3. Pares 3-13 and 3 Replace (existing text, Table 3.2.6-1 and Figure 3.2.6-2) with the following:
2. 0. 6..' Ti e-Mounted De.icec. Therral/Eeis=ie Heve=ent Considerations Where electrical connections must be made to devices (such as
=otor-operated valves, solenoid-operated valves, and te=perature switches) which are attached to a mechanical flow system designed for thermal move =ents, flexible conduit shall be used to co=pensate for c y capaccic / ::::::::ie c:d ceic=i: ::ve:ct.
Typic:11:, fierib'le :::dui:
devicer vhich cre cutje::
- ne::cd :e pipe-:cu::ed cle :ricci theraci = vent :c cre in the 1/2-ic:h
- hr: ugh 1-1/2-inch rc:tc. Erccccive icetthe in c=clier ficribic
- dui: cizec chall be cvcided to decrecte stress c:d prevent pull-cut fictible ec:duit fit:it;s.
- t
- 3. 2. E.S. :
si:rie 02:er: v ! f0!cre - rt ' Fi Etrur u tc e
T': icle endui: :: pipe-::unted i vicer in cci :i: Cc:ccery :
col:rt 1 c: IIN) c ructur : thcil bc : c.c;ltd :: :::p:::::e f r
-E-l ad tborrzilreirri:
nve err.
The =initu Ic: :h ::
enstie :::de:: c ht.. be cc rpe:ifia: : ;eci : 6:cringr er c:
t c. :u.
e; ut. ; the ecyc:ie: :: Tigut: 1. ^. 6 -['.
~ ic langth cf fituir'.e ::::uit
.1.1 i: Curt ::::
5e-counted devicer noe, h
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S RN-G-40-] ]
l' age 6 of 10 s
3.2.6.3;I.' Seiscie Caterorv I (Class i
I at BFN) Structures (Continued)
I capable of sufficient movement in any direction.
The r.inimum bend'
. radii for flexible conduit given in ~rble 2.2.6-1 chcIl not be" violated.
3.2.6.3.2 Nonscismic Catecorv I (Class I at EFN) Structures Flexible conduit to pipe-mounted devices in nonseismic Category I (Class I at BFN) structures shall be installed to compensate
.for ther=al movements oniv.
However, installing conduit per the given equation for seismic Category I (Class I at BFN) structures will provide adequate compensation for nonseismic Category I (Class I at BFN) thermal move =ents.
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i SEN-G-40-11 Page JF~of 10 7
Section 3.3.3. Pane 3 Change first sentence to read:
.boxcI located in seis=ic Category 1 (Class I at EFN) structures shall...'
Sectior 3.3'.4.
Pnee 3 Change accond paragrap'b, second sentence to read:
The size lettering shall be determined by NU CON /0NP, depending on the box size.
Section 4.0, Pace 4 Change title to read:
DIVISION OF liUCLEAR CONSTRUCTION /0FFICE OF NUCLEAR POER QUAI.ITY C Section 4.0. Pace 4 Change to read:
1:U CON /0!;P has the responsibility...
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Firure 3.2.6-1 8
i Rigid Conduit T
/
f W Rigid Condui: Support b
p Coupling
~
Flexible Ccnduit Fitting gfj Rigid Conduit Support Exposed Flexible F
Conduit f lexible Conduit Fitting
~W Exposed Flexible Conduit Coupling I
Rigid Conduit y
Flexible Conduit Fitting Flexible Conduit Fitting L
r
],f-Top of Floor-Mounted r
Equipment or Device i
I Device f
4
~
T -feri Arrenrerent of 71ocr-Mounted Ecuienent or Device and Pipe-Mounted Device The equation for calculating the einicum length of exposed flexibl required between flexible conduit fittings installed at e conduit er pipe-counted device is as fellevt:and flexible conduit fittings insta er de.ict
...,,.c..i w
v.
iiic:e, F1. = Einicut c pt:cd fictii.'e :: dui: :.c g:h tc:vect u> e e
.,:?. c.,.,3 ficnibic c: Cuit fi:-iz;;s.
r SD Fiel:. naccurtd c:r-ight line dirtr. :e bc veer ficri:,le crd;;.:
'.n.cn :: c'::.tcle prevent:
fit t i:; r..
ficnik.'e :r du::
. ctr:.ight line ::trerenc : rf 22; ::::
- .cted i;r i:.)
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r:: qui r ' :. l' r T - I rvy r
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i Ei N-G-40-11 t
Fage )6 of 10 o
Note 1: - For ficxible conduit cut length, the field shall add to the minimum
"<alculated length (FL), the flexible conduit length required for 1
,6tonduit fittings and any additional length required for bend radii.
The mini =um bend radii for flexible conduit given in Tabic 3.2.6-1 shall not be violated.
Any exceptions'to minimum calculated lengths
/
'(FL) and/or minimum bcud radii shall be approved by DNE for Class IE installations.
Note 2:
Exposed flexibic conduit lengths shall not exceed 72 inches or be less than 18 inches, except as noted on design drawings, for Class IE installations.
For exceptions not noted on design drawings, contact
'DNE engineering project for resolution.
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EX 066-002 CD 19200 i: l!PN YYYY
!!S ll!ERE ARE I.01 INODGH CD';tVILET10 IN P.EPORT CorIDUIT RutlS. t.Ux1LIAEY Af4D RE ACi'.R T50133 EUI L DI t:GS. CD:IST RUCTIO'l DEf*l.
OC' C E Rti. CI HAS i0 ADDITI0llAL I:3f 0Rt'AI 10:1.
Ill 138-001 CD 19200 N HDH YYYY lls DURING CABLE PULLS, FISH TAPE, !!UD, T50039 REPORT DIRT (WATER) IS LEFT IN THE C0i!OUIT.
PULLING HOOKS GET JArtMED AND ARE L EFT IN C0tIDUIT. QC & CRAFT SUPERVIS OR ARE IllVOLVED.
IN 201-003 CD 19200 11 WBil YYYY.
IIS TOO MANY BEllDS IN I" CONDUIT RUti Ill T50157 REPORT UNIT I REVERSE OSMDSIS ROOM ELEV. 75 7' AT 4-V.
THERE HERE I:0 FITTIt1GS U SED TO RUN THIS C0llDUIT ttAKIt:G IT EX TREMELY DIFFICULT AND tit 1E C0!ISUMIt;G TO PULL CABLE THROUGH THIS CONDUIT.
8 CI STATED THAT FITTIllGS IN LIEU OF BENDS SHOULD HAVE BEEri USED TO FACI LITATE CADLE PULLS. C0ilST R. DEPT. C ONCERN. H0 FOLLON UP REQUIRED.
IN 341-001 CD 19200 N HBN. YYYY HS FLEXIBLE STAltiLESS STEEL CONDUIT FP.0 T50189 REPORT M VARIOUS EQUIPMENT AND PEllETRATIONS IllSIDE THE C0tlTAINMENT IS HOT TORQU ED EHOUGH AT THE FLEX AND FITTING AT TACHHENT POINTS. QC ACCEPTED THE HD RK.
STAIHLESS STEEL FLEXIBLE CONDUI T CAN BE PULLED APART AFTER BEttlG AC CEPTED BY QC.
ALL PENETRATIONS AND ELECTRICAL EQUIPMENT INSIDE CONTAIrlM ENT.
UNIT 1 & 2 ARE AFFECTED. CONS TRUCTIDH CONCERN. CI HAS 110 ADDITIO HAL INFORMATION.
!!! 512-002 ~ CO i?" : f: b: l YYYY' f:3 UtiiT 2 CC! DUIT FITTII:GS F.EC2!:TLY I';:;
T50046 REPGRT UED TO THE FIELD (TRADE NAME "ERICKS ONS'") ARE OF INFERIOR MATERIAL (SIM ILAR TO PENTER). INFERIORITY IS PAR TICULARY EVIDENT IN THE INTERNAL THR EADED AREA, WHERE THREADS ARE ROUGH AtID FLATTENED. PER DIRECTION OF FOR Et1AH CHAME KNullN) CRAFT (DISCIPLIllE Kt!OHN) ARE REQUIRED TO UtiDECCUT EXTE F.!!AL THRElD*; Dt! CO :DU:7 T0 t LLOW t*:E
. EXPRESSED Oli 2.M".
I" AN*. ;/~P
!!I E':. NO FUPTHEP. SPE; FIOS A.E //A IL*:LC.
- . !: -L f -5 * :.-:: 3 0:
1?I': U :::!1 YYYY US CC"DUIT T.ECE!!TLY I23L'ED TC PIELD FIE T5 3:*i6 P.EPO:1T U;E OU U!!!! 2 EXHILIT t. i.L';t:ET. C.: 7 IECES I!ITH R 03ES At:D IUR!!S I! THE I
!!5I::E DI AliETER.
THE PCTE!! tit.L EXICT J
- DM:: Ar.E M/AILI.E L E.
- . -C I-0 55-C" 4 1!CC: f: MIN YYYY
!:: CDMDUIT Mt." / * !Z::Y f.
FI"E r 0 M!::';
I!!!!4 T.II'L T.T Ill S0:12 I;;3T ANTES t.ND C'IL: OA ::.0T L E F L" L E.
(,.?:25 r.HZ:N T: 001."
D.EL El.5E OF THIS I !r0f. '*.T.* 0;f !!OJLO J2 PPAT:0IZE 07' CD:!PI *'f:;!! A L IT'l'. f:0 firR E !JT f.: L*,
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t OH -LH:07-0L;,, ' CG 15503. Hell YYYY MS I:7.TTO D AP. StA'; HAD TCO ltArrt It37ANCIS 75:::.24 00
- S *' 0 P.E F Ci'.T OF L'NCF.t FT Mall-LIK2 ELECTF. CAL I!]R;;
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