ML18031B285

Special Rept:On 870321,loss of Seismic Monitoring Instrumentation Discovered.Caused by Inadequacy in Instructions & Training.All Instruments Removed from Site Will Be Repaired & Restored to Operation

ML18031B285
Person / Time
Site:	Browns Ferry
Issue date:	03/31/1987
From:	Robert Lewis TENNESSEE VALLEY AUTHORITY
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
NUDOCS 8704130420
Download: ML18031B285 (3)

Text

REGULATORY ORNATION DISTRIBUTION SY N (R IDS)

,f ACCESSION NBR 8704130420 DOC. DATE: 87/03/31 NOTARIZED: NO DOCKET ¹ FAC IL: 50-259 Browns Ferry Nuclear Pouer Station> Unit 1> Tennessee 05000259 5O-260 Browns Ferry Nuclear Power Station> Unit 2> Tennessee 05000260 50-296 Browns Ferry Nuclear Pouer Station> Unit 3. Tennessee 05000296 AUTH. NAME AUTHOR AFF I LIAT ION LEWIS. R. L. Tennessee Valley Authority RECIP. NANE RECIPIENT AFFILIATION Document Control Branch (Document Control Desk)

SUBJECT:

Special rept: on 870321> loss of seismic monitoring instrumentation discovered. Caused bg inadequacy in instructions h training. All instruments removed from site will be repaired 8c restored to operation.

DISTRIBUTION CODE: IE22D COPIES RECEIVED: LTR ENCL SIZE:

TITLE: 50. 73 Licensee Event Report (LER)> Incident Rpt> etc.

NOTES: Zwolinski 5 cg. 1 cg ea to: Axelrad> Ebneter> S. Richardson> 05000259 Liaw> Q. Zec h > OI OI A.

Zwolinski 5 cg. icy ea to: Axe lrad> Ebneter> S. Richardson> 05000260 Liaw> G. Zech> OI> OI A.

Zwolinski 5 cg. icy ea to: Axelrad> Ebneter> S. Richardson> 05000296 Liaw> Q. Zech, OI, OIA.

RECIPIENT COPIES RECIPIENT COP IES ID CODE/NANE LTTR ENCL ID CODE/MANE LTTR ENCL JANERSON> C 1 BWR PD2 PD 1 QEARS> Q 1 1 ST*NG> J 1 1 INTERNAL: ACRS MICHELSON 1 1 ACRS NOELLER 1 1 ACRS WYLIE 1 1 AEOD/DOA 1 1 AEOD/DSP/ROAB 2 2 AEOD/DSP/TAPB 1 NRR/ADT 1 NRR/DEST/ADE 1 0 NRR/DEST/ADS 1 0 NRR/DEST/CEB 1 1 NRR/DEST/ELB 1 1 NRR/DEST/ I CSB 1 1 NRR/DEST/MEB 1 1 NRR/DEST/NTB 1 1 NRR/DEST/PSB 1 1 NRR/DEBT/RSB 1 1 NRR/DEBT/SGB 1 NRR/DLPG/HFB 1 NRR/DLPG/GAB 1 1 NRR/DOEA/EAB 1 1 NRR/DREP/EPB 1 NRR/DREP/R*B 1 1 NRR/PMAS/PTSB (NRRdj-'NASL ILR8

'RE~LE'2 RGN2 F ILE 01 1

1 1

1 1

RES SPEIS> T 11 1 1 EXTERNAL EQhQ QROH> N 5 5 H ST LOBBY WARD LPDR 1 1 NRC PDR NSIC HARRIS J 1 NSIC NAYS> G NOTES: 12 12 TOTAL NUMBER OF COPIES REQUIRED: LTTR 54 ENCL 52

TENNESSEE VALLEY AUTHORITY Browns Ferry Nuclear Plant P.O. Box 2000 Decatur, Alabama 35602 March 31, 1987 U.S. Nuclear Regulatory Commission Document Control Desk Washington, D.C. 20555

Dear Sir:

TENNESSEE VALLEY AUTHORITY - BROWNS FERRY NUCLEAR PLANT (BFN) UNITS 1, 2, AND 3-DOCKET NOS. 50-259, 260, AND 296 - FACILITY OPERATING LICENSES DPR-33, -52, AND -68 The enclosed special report provides details concerning the loss of seismic monitoring instrumentation. This report is being furnished pursuant to plant technical specification requirement 3.2.J.3.

Very truly yours, TENNESSEE VALLEY AUTHORITY obert L. ewis Plant Manager Browns Ferry Nuclear Plant Enclosures cc (Enclosures):

Regional Administration INPO Records Center

'U.S. Nuclear Regulatory Commission Suite 1500 Office of Inspection and Enforcement 1100 Circle 75 Parkway Region II Atlanta, Georgia 30339 101 Marietta Street, Suite 2900 Atlanta, Georgia 30303 NRC Resident Inspector, Browns Ferry Nuclear Plant B704130420 B70331 PDR ADOCK 05000259 8 PDR An Equal Opportunity Employer

Special Report Loss of Seismic Monitoring Instrumentation The seismic monitoring system is physically located in unit 1 at Browns Ferry Nuclear Plant (BFN) and provides seismicity data for all three BFN Units which are presently defueled. In the course of TVA's procedures upgrade program it was recognized that vendor manuals and documentation for the seismic monitoring instrumentation, required by technical

'pecifications, needed improvement or, in some cases, the information was nonexistent. The seismic monitoring system utilized is provided by two vendors. Kinemetrics Systems is the supplier of three biaxial seismic:

switches (triggers), which provide control room annunciation, and of three triaxial time history strong motion accelographs (SMA-2), located on various

. reactor building floor elevations. Teledyne supplies three triaxial peak accelographs which are installed on piping systems within the unit 1 reactor building. A representative from Kinemetrics Systems company was brought onsite to provide hands-on training for instrument mechanics and engineers

'relative to proper testing, calibration, and servicing of the instruments.

On March 21, 1987, culminating the four-day training course, the seismic triggers located in the reactor building on the base slab were carefully examined. In the opinion of the vendor specialist, none of the three triggers would have provided the required control room annunciation upon receipt of a horizontal O.l g seismic acceleration. It is not known how long the seismic triggers were not fully functional. Located adjacent to the triggers is a SMA-2. Immediate attention was focused on the SMA-2 located on the reactor building base slab, as it is the most critical for seismic monitoring. After field work it was restored to operable status the next day. Another SMA-2, located on the reactor building third floor, was not considered serviceable onsite, so it was taken back to Kinemetrics, along with the three seismic triggers. The remaining SMA-2 of the three was found to be in satisfactory condition.

The vendor manuals and other instructions furnished with the instruments were not written for power plant maintenance personnel, but for seismologists. The seismic triggers installed at BFN are approximately 15 years old and are regarded as one-of-a-kind. Kinemetrics Systems has only recently made training available to utilities, as utilities represent a very small portion of their business. Surveillance instructions, previously regarded as adequate, did not provide detail necessary for the average technician. Maintenance personnel, for example, were not trained to recognize that a small crinkle in the foil-like flexor would hamper the overall performance of the seismic trigger. Such a crinkle was found in one trigger.

All instruments removed from the site will be repaired and restored to operation within 30 days. Surveillance instructions will be revised to include more detailed inspections of the instruments. The surveillance procedure for the three Teledyne peak accelographs will be performed in May 1987. They are considered at this time to be operable.

TVA geologists believe, based on regional records, that no seismic activity since initial startup has been of a magnitude (greater than 0.01 g) recordable on plant instrumentation.

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