ML20204G237

Rev 3 to TVA Employee Concerns Special Program Sequoyah Element Final Rept C019101-SQN, Electrical Equipment

ML20204G237
Person / Time
Site:	Sequoyah
Issue date:	03/16/1987
From:	Martin M, Russell J, Stewart D TENNESSEE VALLEY AUTHORITY
To:
Shared Package
ML20204G202	List: ML20204G199 ML20204G237 ML20204G282 ML20204G330 ML20204G377 ML20204G409 ML20204G430
References
C019101-SQN, C019101-SQN-R03, C19101-SQN, C19101-SQN-R3, NUDOCS 8703260362
Download: ML20204G237 (7)

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/ *4 , TVA EMPIAI M C 3CHRNS REPORT NUMBER: C019101-SQN

, SPECIAL FRO,; JAM

'\' . T I g REPORT G ?5: Sequoyah Element - Final Rep'crt REVISION NUMBER: 3

[iJ Yb'LE: Elentrical Equipment PAGE 1 OF 6

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REASON FOR REVISION:

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) , Revision 1 - Incor opte TAS and SRP Comments

)c Revision 2,- Incorptrate TAS and SRP Comments-and Finalize Report.

I yc Revision 3 - Incorpo:' ate Additiond Evaltf ation ResultinE From NRC Comments and Finalist, Report e i q

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4 A A a L _ 3hvSh ECSP MANhP.R r DATE MA MANAGER OF NUCLEAR POWER DATE

! CONCURRENCE (FINAL REPORT ONLY)

• SRP Secretary's' signature denotes SRP concurrences are in files.

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'*M o TVA EMPLOYEE CONCERNS REPORT NUNBER: C019101-SQN

. SPECIAL PROGRAN REVISION NUMBER: 3 PAGE 2 0F 6 y

I. Introduction Employee Concern IN-85-913-001 Oss ' determined to be generically applicable to Sequoyah Nuclear Plant (SQN) resulting from the is evaluation performed by the Watts Bar Nuclear Plant (WBN) Employee , ,

Concerns Task Group (ICTG) as described in the element report:

! Junction boxes (C019101) within the Construction category.

Norelatedsite-specificconcer$swereidentified.

II. Summary of Perceived Problems /

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iGalvanized steel junction boxes were' thought to be' unacceptable since o- , upper-tier procedures did'not specifically allow their use. These

" galvanized junction boxes could be found throughout the plant.-

III. Methodology , j

. a. Reviewed Quality Technology Company (QTC) expurgated files to determine whether, additional relevant information was available.

b. WBN ECTG Element Report C019101, " Junction Boxes" was-reviewed to determine the procedure deficiencies at WBN.

c. A cognizant Modification and Addition Engineering Section individual was contacted to determine whether clarification was required in regard to mateeial requirements for junction box construction.

d. Reviewed conduit and grounding drawing 45N810-7, Revision 35, l l '

entitled " Conduit and Grounding, Floor Elevation 669.0, Ceiling l Plan" .and the Master Bill of Material for electrical equipment to I determine the numbering scheme used by DNE to identify and describe l those junction boxes specified for installation 1

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e. Work plan number 12292 related to the implet;cis' .a of ECN 6823 l was reviewed to determine the control meths2 ut.cfzed to ensure the l proper installation of junction (splice) boxes. I lR3

f. Electrical Maintenance Planning personnel were contacted to discuss I the controls established or utilized during the maintenance request l (MR) or work-releese (WR) process related to junction box 1 replacement. l t l l' g. ' Procurement personnel were contacted to ascertain the documentation / certification requirements for procuring and l

l receiving electrical junction boxes and a review of the offected I documents was performed. l l

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6 . , TVA EMPIAYRE CONCERNS REPORT NUMBfR: C019101-SQN

. SPECIAL PROGRAM REVISION NUMBER: 3 PAGE 3 OF 6 s.

h. Modification and Addition Instruction (M&AI)-6, " Installation of lR3 Conduit and Junction Boxes" Revision 6, was reviewed to determine whether clarification'was required pertaining to a definition of corrosive resistant material.

IV. Summary of Findings

a. Review of QIC expurgated files revealed no additional information.

p is b. Review of"WBN ECTG Element Report C019101 revealed that site laplementing procedure WBN-QCP-3.03, revision 18 did not specifically list galvanized steel with other materials as an acceptable material for junction boxes; therefore, interpreted by the concerned individual (CI) as an intent to exclude galvanized steel for use. The WBN site procedure is being revised to specifically list galvanized steel as an acceptable material for junction boxes as allowed by the National Electric Code, Article 370-20 and General Construction Specification G-40, in order to clarify the acceptability of galvanized steel.

c. The Modification and Addition Engineer interviewed indicated junction boxes were either specified and procured by Division of Nuclear Engineering (DNE) with mark number assignments, or fabricated onsite utilizing standard drawing SD-E13.6.3-1, '

i Revision 5, dated August 20, 1984. Note numbers 2 and 15 specify the material type as sheet steel and corrosive protection is accomplished by painting. This corrosion protection method is consistent with the requirements of the National Electric Code.

Additionally, no problems or confusion had been identified for the material requirements related to junction box construction and substitutions had not been made.

d. Review of conduit and grounding drawing 45N810-7, Revision 35 l revealed that junction boxes were given unique identification l numbers with the appropriate mark number assigned by the Division l of Nuclear Engineering (DNE). Each mark number was to be utilized l by the constructor during the installation process in conjunction I with "The Master Bill of Material for Electrical Equipment," to l describ2 the type of junction box required at the specified l locatice. l lR3 Review of the Bill of Material for various mark numbers revealed a 1 general description of the affected junction box and included its l size, type or NEMA rating, and other pertinent data such as I contract and item number, etc. (Reference 45BM826 R4 SHT 16 of 45, I and 45BM828 R3 SHT 14 of 45). Reference to the " type" of junction l box was DNE's method to specify which TVA standard drawing was to l be utilized during fabrication and assembly. l l

• . . TVA EMPLOYER CONCERNS REPORT NUMBER: C019101-SQN

, SPECIAL PROGRAN REVISION NUMBER: 3 PAGE 4 OF 6 p

l e. Work Plan number 12292 associated with ECN number 6823 revealed l that the-junction box material was issued on 575 number 5887004260 l as steel sheets (3 each) 12 GA, received as item number 2 on i 4- contract 85 PK-7-356975-1 with heat number 65648 (as Level I). l 1 This material was consistent with the DNE standard drawing i SD-R 13.6.3-1 requirements for the sizes of boxes to be i fabricated. The fabrication of each junction box was governed by l the applicable design drawings and according to the requirements of l M&AI-8 (inspection of site fabricated assemblies) would receive the I appropriate QC verification. The information supplied to the QC l inspector included the unique identifying number which specifies l Its location, the associated DNE established mark number, size, and l appropriate DNE standard drawing, etc. The protective coating of l those boxes was to be accomplished according to the requirement of l

< MI-10.14 and documented according to M&AI-11 (Reference I paragraph 2.3E PG 17). Upon, successful completion of the l fabrication, the splice (junction) boxes were to be installed l according to the requirements of M&AI-6. M&AI-6 section 3.3 l adequately addresses the fabrication and coating of junction box l repair and installation. l l

NOTE: Work plans requiring the installation of DNE procured l Junction bczes were not readily available at the time of l this evaluation. IR3 l

f. Discussion with Maintenance Planning personnel revealed that l maintenance request / work' releases were reviewed and the l Installation requirements were specified. Work releases involving l junction box repair and/or replacement would specify the I requirements of M&&I-6 and was deemed acceptable by this l evaluation. Personnel were knowledgeable of MRs and WRs related l to junction box repair / replacement but none were readily available l for review.

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g. DNE Site Procurement personnel indicated that the procurement l

, process related to ordering junction boxes included the requirement l to meet the applicable NEMA rating. Additional information on the l

, Procurement Request form included a general description of the l

_ junction box, it's size and DNE assigned mark number. Contract l t number 86PLG-839108 was reviewed and appropriately specified a i certificate of conformance from the supplier attesting that the l Junction boxes purchased as item 1 and item 2 meet the appropriate l NEMA standards (NEMA 12 for model A161206LP-mark number JWA, and l NEMA 4 for model A606CHNF-mark number JVA-1; respectively). The l certificate of conformances supplied by the Hoffman Engineering l Company related to item 1 and 2 of the subject contract attested I that the terms of the purchase order had been fulfilled. The l certificates were traceable to the hardware by a combination of l contract / item number and/or the NEMA rating. This evaluation I concluded that the procurement process is adequate to ensure the i proper (correct) NEMA rating of each junction box and that the certification traceability was acceptable.

.. , TVA EMPLOYEE CONCERNS REPORT NUMBER: C019101-SQN

, SPECIAL PROGRAN i I

REVISION NUMBER: 3 PAGE S OF 6

h. M&AI-6, " Installation of Conduit and Junction Boxes," revision 6, IR3 revealed that materials used in the installation of electrical conduit systems and conduit boxes shall meet the requirements of an approved recognized standard. No specific material requirements were extracted or given as examples to introduce error or confusion related to the material requirements for junction box construction.

Conclusion Site implementing procedures N&AI-6, revision 6, is adequate as written and is consistent with the National Electric Code, Article 370-20 and GCS G-40 with regard to material requirements of junction box construction. Program enhancement could be accomplished by DNE should l a list of acceptable materials be compiled and injected into the l governing design out-put document (G.C.S-G40). This enhancement lR3 would ensure that the constructing organization was knowledgeable l of those materials which support plant design. I Since galvanized junction boxes are constructed of a reactive metal similar to aluminum and react with borated water to form hydrogen, the design basis calculations for hydrogen build-up inside containment should include these and other similar items in the inventory process.

The control of such reactive metals within the confines of the containment is discussed in WBN-ECTG Element Report C019203-SQN entitled, " Conduit Fittings" within the Construction category and provides the methods which will ensure that these materials are included in the design basis calculation for hydrogen build-up and that future updates to the calculation package will include these and other similar materials. Also included in the above mentioned report are l requirements to control the reactive metals (zine) inside containment lR3

by utilizing TVA specification 21.001 on procurements involving conduit l l and associated hardware. l l

V. Root Cause None VI. Corrective Actions None

• . . TVA EMPIAYEE CONCERNS REPORT NUMBER: C019101-SQN

. SPECIAL PROGRAM REVISION NUMBER: 3 PAGE 6 OF 6 VII. Generic Application Site implementing procedures related to junction box installation at BLN and BFN should be reviewed for clarity with regard to the material requirements of junction box construction-consistent with WBN ECTG Element Report C019101.

VIII. Attachments Attachment A Listing of concerns indicating Safety Relationship and Generic Applicability l

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v - Co/9101- s9N'- K 1- .

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9/1/N ON 913-001 CO 19100 N HBN YYYh I-85-524-NBN ELECTRICAL JUNCTION BOXES ARE NOT PE p& R G-40 AND ELECTRICAL STANDARD DRAHI REPORT NGS, IN THAT THEY ARE MANUFACTURED 0 T50092 F GALVANIZED STEEL INSTEAD OF SHEET STEEL HITH PAINT ON BOTH SIDES. THE SE JUNCTION BOXES MAY BE FOUND THROU GHOUT THE PLAT 4T, ESPECIALLY IN THE A DGB (AUXILLIARY DIESEL GENERATOR BUI LDING C/I HAD HO FURTHER INFORMATION

, NO FOLLOH UP REQUIRED.

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