IR 05000327/1988010

Insp Repts 50-327/88-10 & 50-328/88-10 on 880111-15.No Violations or Deviations Noted.Major Areas Inspected: Employee Concerns,Electric Components & Cables & Structural Supports

ML20195J840
Person / Time
Site:	Sequoyah
Issue date:	05/25/1988
From:	Cortland P, Marinos E, Paulitz F NRC OFFICE OF SPECIAL PROJECTS
To:
Shared Package
ML20195J838	List: IR 05000327/1988010 ML20195J833
References
50-327-88-10, 50-328-88-10, NUDOCS 8806290253
Download: ML20195J840 (8)

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UNITED STATES NUCLEAR REGULATORY COMMISSION

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OFFICE OF SPECIAL PROJECTS TVA PROJECTS DIVISION i

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l Report Nos.: 50-327/88-10 and 50-328/88-10

. Docket Nos.: 50-327 and 50-328 i Licensee: ,

Tennessee Valley Authority (

6N 38A Lookout Place J 1101 Market Street i Chattanooga, Tennessee 37402-2801 l Facility hame: Sequoyah Nuclear Power Plant i Inspection Conducted: January 11-15, 1988 l l

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l Inspectors: _

T P. Cortland, Inspection Team Leader Date Signed

% f ? O - f gg F. P. Paulitz, Electrical Engineer DatetSigned

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Approved by: \ I E. A. Marinos, Chief Date Signed Reactor Operations Branch TVA Projects Division Office of Special Projects Sumary Scope: This announced inspection was conducted in the areas of employee concerns, electric components and cables, and structural support Results: No violations or deviations were identified. Observations were made concerning the procedures for installing electrical equipment, space heaters for diesel generators, follow-up of an item from a previous visit and an employee concern, i

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8806290253 080614 l PDR ADOCK 050003D7 0 PDh l

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REPORT DETAILS

. PERSONSCONTACTH The persons contacted during this inspection including those present at the exit interviei are listt) in Attachment . EXIT INTERVIEW The inspection scope and findings were summarized on January 15, 1988, with those persons indicated in Attachment 1. The inspectors described the areas inspected and discussed in detail the inspection observations and coments. No dissenting co reni were rece brd from the licensee. The licensee did not

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identify as proprietary any of the material provided to or reviewed by the inspectors during this inspectio . LICENJEEACT10NOFPREVIOUSIDE:.TIFIEDITEMS On October 30, 1987 at the exit meeting with the licensee, the NRL staff mentioned that thr"e were errors ir. the welding symbols for ECN 7297. The licensee acknowledged these coment On January 13, 1988, the R C staff discovered that the welding details in j ECN 7297 had no+ been corrected and the components had been fabricated and installed. A review of the relevant FCR files did not show -hat a drawing correction was po Ming. Examination of the structures showed that a 3x3 tube .

was centeree on a 4x4 tube and attached by fillet welds, contrary to a drawino 1 and a mitered angle was attached by fillet welds, also contrary to a drawing, i The as-built structures are satisfactory, but they do not agree with the I drawings. The observa+. ion is that the staff identified drawings errors wiuch

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j were ac'nowledged by the licensee, but 11 weeks later the com,oonents had been j installed with the errors and there were not any corrective action Subsequent to the inspecticn, the licensee forwarded copies of the drawinns i and indicated the portions to be revised to make the drawings :. gree with : 1 structu re s . The documentation of the changes is identified as WP 12686,

Pages IV-29 ano IV-31. This item is close '

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LICENSEE CORRECTIF 3CT QN ON EMPLOYEE CONCERNS l 4.1 Scope The purpose of this insps w tov- 'Se corrective actions outlined by 3 the licenses in the Cmp 12 . * *y visual examination and a

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selective review of doct? !

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4.2 Documents Reviewed The documents reviewed during this it.spection are listed in' Attachment .3 Plant Walkdown and Observations The plant walkdown was conducted in the following areas:

6.9kv Switchgear 480.' Load Centers 480v Motor Control Centers 125vDC Batteries / Chargers 125vDC/120vAC Inverters Auxiitary Building (partial)

Containment (partial)

Emergency Diesel Generators During the walkdown the following items were examined:

Cleanliness external to electrical component Cleanliness inside of selective 6.9kv breaker compartment, selective electrical containment penetration and around the batterie '

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Cable trsy fil Cable fire coatin Cable fire / pressure stops at fire barrier Emergency diesel generator space heaters operabilit Location of non-safety components relative to Class 1E electrical component .

4.4 Findings i

4. l General Construction Specification G-38, "Installing Insulated Cable Rated Up to 15,000 Volts," does not provide guidance regarding the tool to be used when 1 breaching cable fbe stops. Sequoyah Modification and Addition Instructions, M&Al-04, "Installation of Control, Power, and Signal Cables," re'ers to the use I of fish tape as a fire barrier breaching tool and M&AI-13, "Electrical Pressure 5eal Fire Stop Barrier ...," pennits the use of a metallic fire stop breaching ,

tool for cable tray fire stop However, the latter procedure specifies a !

non-conductive bloat 'ag tool for conduit fire stops. Watts Bar M&Al-14 was wised to permit eitner 6 wood or fiberglass fire stop breaching tool. The J-38 specification should be revised to give guidance for the prcper fire l Atoo breaching tool arm the M&Als be revised to be consistent. This is an unresolved item (88-10.01).

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GCS, G-40,~"Installing Electrical Conduit System and Conduit Boxes," does not provide the guidance regarding the maximum and minimum torque values for each size of flexible conduit fitting in each size used by the license The GSC G-40 should be revised to give this guidance and M&Al-06,

"Installation of Conduit and Junction Boxes," be revised to be consisten This is an unresolved item (88-10 02).

4. During the walkdown of the Standby Emergency Diesel Generators, the inspector felt the casings and observed that the amount of heat produced by some of the

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electric space heaters appeared to be low compared to the heater ratings and the heaters may be inoperable. These heaters are required to be operable when the generator is in the standby mode to preclude moisture from the field and stator windings. This is an unresolved item (88-10-03).

4. A portion of employee concern IN-85-886 was not evaluated by the licensee in the Employee Concerns Special Program. According to the concern, NCR 5929 was issued for system 30 (HVAC) for Watts Bar 2. Valves were purchased with an FSAR requirement that they close in four seconds. The solenoid. valves for these valves were replaced when it wes discovered that the solencid valves had not been tested and certified per NRC requirements. The new valves had a closure time of 20 - 30 secor.ds and a NCR was written on three (2FCV30-2, 2FCV30-5 and 2FCV30-12) of the approximately nine valves in question. These three valves were replaced and now close within the reouired time. The status of the other six valves is unknown and this may be a generic problem. This is an unresolved item (88-10-01).

4. Sequoyah Element Report 223.1(B) is concernea with instrument line support connections. One employee concern raised was that the tightening requirements for bolts used with single-hole Unistrut clamps were inadequate since the bolts only have to be given a half turc past hand-tight. The licensee noted that the vendor intended round head screwdriver slot screws to be used. TVA'c Singelton Labs tested the clamps and found that it took about 35 lbs. to pull the tube out of the clamp, regardless of whether the tube was 1/4 inch or 1 inch diameter and the licensee concluded that this was acceptabl The NRC staff did not accept this conclusion because of the low strengths for the large sizes and the lack of confidence in tightening with a screw driver ,

and performed additional tests and evaluations at Sequoyah. The staff found l that the large size clamps for 3/4 inch and 1 inch tubing are not in stock at Sequoyah and the other three sizes, 1/4, 3/8 and 1/2. inch are used on instru-ment panel supports with hex head bolts. Therefore, this employee concern was not substantiated for Sequoya l

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However, the pull tests with a screw driver-tightened clamp required very .

little effort to rotate the tube and a minor effort to pull the tube out of j tha clam The walk-downs in the Power Block and Turbine Building showed the 1 1/4 inch clamps to be tight. Some 3/8 and 1/2 inch clamps-on non-safety-r(lated instruments panel supports were loose in the Turbine Building and at the exit meeting, the plant manager directed that all such bolts be tightene j The staff will monitor the installation of instrument line support conriections l on a continuing basis, i

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ATTACHMENT 1 .

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PERSONNEL CONTACTED

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Licensee Employees J. Adams, DNE Materials Technical Branch T. Arney, Manager Quality Assurance

• N. Black, Electrical Engineer, DNE/EEB F. Denny, Engineering Assurance R. Denny, Project Manager, Employee Concerns

• G. Fiser, Chemistry Program Manager

• R. Fortenberry, Superintendent, Technical Support

• G. Gault, Supervisor, Reactor Engineering R. Hall, Manager, Electrical Calculations

• T. Howard, Supervisor, DNQA Operations-Surveillance

• J. Howell, Nuclear Engineer, Reactor Fuel and Analysis

• T. Hughes, Principal Electrical Engineer, D3E EEB

• G. Kirk, Manager, Compliance Licensing T. Kontovich, Engineering

• R. Martin, Technical Services Engineer, DNE

• D. Maxwell, Electrical Engineer, DNC

• R. Mullin, Deputy Manager, Reactor Fuel and Analysis R. Sedlak, lead Electrical Engineer, DNE ,

• E. Sliger, Manager of Projects, Site Director's Office

• S. Smith, Sequoyah Plant Manager J. Sullivan, Supervisor, PORS J. Swearingen, Project Management, ECSP

• B. Ulsh, Co-op Employee, Compliance Licensing

• C, Whittemore, Licensing Engineer, Compliance Licensing Other licensee employees contacted included engineers, technicians, and office personnel Licensee Contractors

• R. Gagne, Employee Concerns Task Group, Daniels International

• R. Remington, SNM Engineering Associates

• R. Tietz, Employee Concerns Task Group Resident Supervisor NRC Inspectors

• J. Bates, Region 11 Office M. Branch, Natts Bar P. Harmon, Sequoyah K. Jenison, Sequoyah Senior Resident Inspector

• Marsten, Region li Office G. Walton, Watts Bar

• Attended exit interview

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ATTACHMENT 2 l

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D0CUMENTS REVIEWED l i Sequoyah Final Safcty Analysis Report, Revision 4, Section 8.3, "Onsite Power. System." , Sequoyah Administrative Instruction AI-11, Revision 44, "Receipt Irdpection, Nonconforming Items, QA Lovel/ Description Changes and Substitnions." General Construction Snecification G-38, Revision 8, "Installing Insulated Cables Rated Up To 15,000 volts." General Construction Specification G-40, Revision 9, "Installing Electrical Conduit Systems and Conduit Boxes." Modification & Addition Instruction SQN-M&Al-04, Revision 12, "Installation of Control Power and Signal Cables." SQN-M&Al-06, Revision 8. "Installation of Conduit and Junction Boxes." SQN-M&Al-07, Revision 11. "Cable Tenninations, Splicing and Repairing of Damaged Cables." SQN-M&AI-13, Revision 8 "Electrical Pressure Seal-Firestop Barrier System and Fire Retardant Cable Coating." Engineering Project Manual SQEP-09, Revision 2, "Change Review Check for Electrical Calculations."

1 SQEP-06, Revision 3. "Cable and Conduit Procedure."

11. Design Criteria SON DC-V-11.3, Revision 6. "Power, Control, and Signal I Cables for use in :stegory 1 Structures." I 12. SON-DC-V-12.2, Revision 6, "Separation Electric Equipment and Wiring."

1 D.NE Calculation EEB86C801, August 12, 1986, "Instrument Cable Shield Grounds Due to Moisture in Harsh Environment."

14. Calculation QIRMEBSQN 87198RO, December 11, 1987, "Cable Tray Through-Penetration Fire Stoo System."

1 Engineering Drawings )

47A050-17. -18, "Mechanical Hanger Drawing General Notes (Clamps)"

15N800, 35N800, 45N800, "Conduit and Grounding Detail Drawing Series" 45N880-23, Sheet 1, "Power House Control Bay Units 1 & 2, Conduit and Grounding Cable Trays Detatis" 45W880-26, Sheet 13, "Cable & Grounding Cable Trays, Fire Stop Penetrations" l

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'y Mr. S. A. White Tennessee Valley Authority -3- Sequoyah Nuclear Plant

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SUBJECT: NRC INSPECTION REPORTS NOS. 50-327/88-10 and 50-328/88-10

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DIDSTRIBUTION: (w/ enclosure)

• DC5-150-327/328)+

NRC POR ,

Local POR TVA TP Reading OSP Re ' ding SEbneter JPartlow JAxelrad SRichardson BDLiaw KBarr SBlack RHermann EMarino PCortland FPaulitz OGC JRutberg FMiraglia, NRR JDonohew, OSP ,

BHayes, 01 SConnelly, OIA EJordan, AE0D ACRS (10)

TVA-Rockville r

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