ML20084T925
| ML20084T925 | |
| Person / Time | |
|---|---|
| Site: | Browns Ferry  |
| Issue date: | 09/21/1976 |
| From: | Fox H TENNESSEE VALLEY AUTHORITY |
| To: | Moseley N NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| References | |
| LER-BFRO-50-259-761, NUDOCS 8306240277 | |
| Download: ML20084T925 (3) | |
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l (PLIASE PRINT ALL REQUIRED INFORMATION]
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NA g LCENSE NUMBER PE TYPE Q l Al Ll Bl Rl Fl 1l l0 l0 l-l 0 l 0l 0] 0l 0l-l0 l0 l l4l1 l1 l1l1l l0 I 3_j 7 89 14 15 25 26 30 31 32 CATEGORY T E DOCKET NUMSER EVENT DATE REPORT DATE hCON'T [ l l [ LJ lL l l0l5l0l-l0l2lSI9l l 0l 8l 2l 3l 7l 6l l
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7 8 57 58 59 60 61 68 69 74 75 80 EVENT DESCAIPTION g l Units 1 and 2 in REFUEL mode; unit 3 in STARTUP mode at 50 psig.
The seismic setnointsl 7 89 CO g l for: (1) SMA accelerometers were found at 0.lg and not 0.01g as recuired: and (2) Alarm l t
7 69 80 g j triggers were found at 0.Olg and not 0.lg as required.
Capability of SMA accelero-l 7 89 SE l graphs to monitor possible operatine basis earthcuakes (>0.1c) van preserved.
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,gl BFRO-50-259/7614 80 7 80
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COOE COMPONENT CODE R
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- 43 44 47 48 CAUSE DESCAIPTION gg l Seismic setpoints inadvertently reversed in surveillance instructions for 3 SMA J
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@ l accelerometers and 3 alarm triggers. Equipment: kinemetrics SMA-2 (accelerometers) l 80 7 89 DE l and MS-3 (triggers). Surveillance instructions corrected.
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's'YATUS 80 C' "
% POWER OTHER STATUS DISC VERY DISCOVERY DESCR@fCN W
l 0l 0l 0l l NA l d l Review of technical specifications l 7 8 9
10 12 13 44 45 46 60 OS NAGE l ES AMOUNT OF ACTnnTY LOCATON OF RELEASE
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10 11 44 45 PERSONNEL EXPOSURES 80 NoveE R tvPe cESCwf0N gg l0 l 0 l 0l
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13 EO PERSONNEL INJUATES NUM BE R CESCMTON 3 l0l0l0l l NA l
7 89 11 12 80 OFFSITE CONSEGUENCES HI 7 89 1
m LOSS OA OAMAGE TO FACillTY 80 TYPC
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7 89 10 8306240277 760921 80 t a lC Tv DRADOCK05000g 7 89 80 ADO!TIONAL FACTOAS 1 e l Investigation shows that instrument maintenance instruction (IMI) 3004, " Seismic
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7 89 60 g l Instrumentation," issued on 6/4/73, contained the required setpoints. These values j
7 89 (Continued next, sheet) 80 NAME:
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LICENSE EVENT REPORT (Continued) l I
BFRO-50-259/7614 ADDITIONAL FACTORS (Continued) 20 were inadvertently transposed when the initial surveillance instructions 21 (SI 4.2.J-1 and -2) were prepared on 5/11/76, in anticipation of expected 22 plant technical specifications.
23 These reversed setpoints were confirmed on 8/23/76 when the units 1 and 2 24
! echnical specifications were fully reviewed.
t With the setpoints reversed, 25 the SMA was capable of monitoring and documenting on a seismograph tape any 26 tremor 50% below the design basis earthquake (DBE) of 0.2g, which 27 corresponds to the operating basis earthquake (OBE). If an earthquake had 28 occurred while the setpoints were reversed, the only unavailable post-29 earthquake information would involve tremors below the OBE (>0.01 but <0.lg).
30 Consequently, this deficiency did not prevent plant seismic instruments from 31 performing their intended function.
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C TENNESSEE VALLEY AUTHORITY a
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e CHATTANOOGA. TENNESSEE 37401 2p#2/ 19 6
Septer.ber 21, 1976 9
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Mr. Norman C. Moseley, Director f4 N
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U.S. Iluclear Reculator/ Com:ission
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Offico of Inspection and D1 force:aent SEP2819'l> @
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230 reachtree Stecct,174., 8th Floor
. assiseen v3 Atlanta, Georgia 3v303 g
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Dear 1/.r. Hoscley:
TI2HE3SEE VAI2Ef AUTIIORITY - ERO.'Ii3 FERRY HUCIS\\R FIAITf UllIT 1 -
DOCKET NO. 50-259 - FACTr.T'n otEFATIITG LICE:0E DFR REPORTABIS OCCUd1EUCE RE:0RT B310@-25)/761)
The enclosed report la to provide details concerning the sciauic 2ctpointa for GMA accolcro;.cters and alana triggers that ucre not act J n accorutnce with technical require 2cnta. This report is sube.dtted in accordance with Bro;na Ferr/ ~ Technical Syccifications 3cctic11 6.
~d.s c.eut occurred ca ru. onus b r,y I;ue lua c ' la ni, i
u unit 1.
Very trt0y yours, TEIEMSHS VALIrf AUTHORITY H. S. Fox 3
Director of Itwer IToduction Enclosure (3) k CC (Enclosuro):
Director (3)
Cffico of Zhnaccaent Inforcation and Irogram Control U.G. Ilucicar Regulatory Cocaission i
Vechington, D.C.
20555 1
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_Directar RO) i Offico of Inspection and Enforce. tent i
U.S. Ifuclear Regulatory Cocmission f
Washington, D.C.
20555 1
l 8811 l
COPY SENT REGL 1,
An Eriual Opportunity fimployer
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