ML20216H078
| ML20216H078 | |
| Person / Time | |
|---|---|
| Site: | Vogtle  |
| Issue date: | 09/10/1997 |
| From: | Mccoy C, Sheibani M SOUTHERN NUCLEAR OPERATING CO. |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| LCV-1090, LER-97-S01, LER-97-S1, NUDOCS 9709160129 | |
| Download: ML20216H078 (5) | |
Text
_,- . C. K. McCoy Southern Nuclear Vice President Opersting Company. Inc.
Vcgtle Project - 40 invemess Centar Parkway
- PD Box 1295 Birmingham. Alabama 35201 1el205932.7122 fax 205992 0403 SOUTHERN Ra COMPANY Energy oSernnurWarId*
September 10, 1997 LCV-1090 Docket No. 50-425 '
U. S. Nuclear Regulatory Commission
- ATTN: Document Control Desk Washington, D. C. 20555 ladies and Gentlemen:
l VOGTLE ELECTRIC GENERATING PLANT LICENSEE EVENT REPORT 2-97-S01 SECURITY SYSTEM DEGRADATIONS DUE TO INCLEMENT WEATHER in accordance with the requirements of 10 CFR 73.71, Southern Nuclear Operating Company (SNC) hereby submits the enclosed report associated with an event which occurred at Vogtle Electric Generating Plant on August 16,1997.
Sincerel ,
C. K. McCoy CKM/TEW/AFS
Enclosure:
LER 2-97-S01 cc: Georgia Power Company Mr. J. B. Beasley, Jr.
Mr. M. Sheibani f
/g //L(f (/jgl NORMS LL (i A
U. S. Nuclear Regulatory Commission Mr. L. A. Reyes, Regional Administrator Mr. L. L. Wheeler, Senior Project Manager, NRR NRC Senior Resident Inspector, Vogtle 9709160129 970910 PDR ADOCK 05000425 S PDR lllllllllllllOl.lillilll. lit.lilll.li
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SECURITY SYSTEM DEGRADATIONS JUE TO INCLEMENT WEATHER EVENT DATE (5) L ER NUMBER (S) REPORT DATE (7) Of MER F ACluiIES sNVOLVEO l$)
MONTH DAY YEAR YEAR 8Eg%A ! ' gay MONTH DAY YEAR F ACILITY NAME DOCAET NVMBER;S)
F AC4UTY NAME 01510lo101 ll
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Ol8 116 917 9l7 Sl011 010 Ol9 1 l0 9l7 ol5lololol l l OPERAYMO THIS REPORT IS SUBMif TED PUR&UANT TO THE REQUIREMENT & OF 10 CFR *: (Check one er more) (11)
MODE 10) ] 20 2J01(r) 20 220hax2)M SoThax2M 60 Thag2xvm)
POWER 20 2203(eX1) 20 2203(sW310) 50 TheK2Xu) 50 73(aK2xn)
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< 202203(aK2Wa) 20 203hcK1) 50.73(aK2N OTHER 20 220hax2xm) 50 3akcx1; 60 7hagaxv) Spec #ye Abstactbedow 20 220haK2N SC 36(cx2) 50 Thax2xvw) ca m NRC Form 3664 uCENSEE CONT ACT FOR TH&$ LER (12)
NAME TELEPHONE NUMBER (mciuoe area Code)
Mehdi Sheibani, Nuclear Safety and Compliance 7lOlp 812l6l-13l210l9 COMPLE TE ONE LINE FOR EACM COMPONENT F AJLURE DESCRIBED $N TMa& REPORT (13)
CAUSE SYSTEM COMPONENT MANUFACTURER REPORTABLE CAUSE SYSTEM COMPONENT MANUFACTURER
. ' REPORTABLE j TO NPRDS , s TO NPRDS A IlA ClPlUI i 1 l N M. % A 1lA MlOlDlE I I I N g" "e A IlA DIEITI I l l N A IlA 18l91 l l l N SUPPLEMENTAL REPORT EAPECTED(14) EAPECTED MONTH DAY YEAM
$UDMISSION YES (if yes. semp6ete EXPECTED SUBulSSION DATE)
X NO DATE (15) l l l awn CTS M 1 - .. e.,, - . - )c.
On the evening of August 16,1997, the plant was experiencing severe weather in the form of heavy rain, high winds, hail, and lightning. A supervisory alarm from a vital area door was received end a multiplexer for several vital area door alarms failed off-line, disabling alarm functions from those doors. Over a period of time, compensatory posts were established for all of the failures involved.
However, the inability to compensate for these failures within 10 minutes represented degradations that could have allowed unauthorized or undetected access into a vital area.
The cause of this event was severe weather that resulted in security system degradations which were not compensated within 10 minutes. These degradations could not be timely compensated because of personnel safety concerns resulting from the weather. In addition, normal shift manning does not allow for timely compensation for the number of failures that occurred. Following completion of repairs and testing, all components were retumed to service and compensatory posts were terminated.
1 NRC Form 346(+45) l
, a hac tons sesa U.S. NUCLEAR REGULATORY COMMISSION 1404 LICENSEE EVENT REPORT (LER)
TEXT CONTINUATION P AcauTY hAsat (1) DOCKEl NW8dSER (2) LER hut 4BER (6) PAGE (3) ma E **=l," m a5,,fg Vogtle Electric Generating Plant - Unit 2 w ,,,- . - - . w . % o 015l0l0l014l2l5 917 Sl0l1 -
0l0 l2 oF l4 A. REQUIREMENT FOR REPORT This report is required per 10 CFR 73.71 (b)(1) and 10 CFR 73, Appendix G. The failure to compensate for the loss of security system devices within 10 minutes represents a degradation that could have allowed unauthorized or undetected access into a vital area (VA).
B. UNIT STATUS AT TIME OF EVENT At the time of this event, Unit 2 was operating in Mode 1 (power operation) at 100 percent of rated thermal power. Other than that described herein, there was no inoperable equipment that contributed i
to the occurrence of this event.
C. DESCRIPTION OF EVENT On the evening of August 16,1997, the plant was experiencing severe weather in the form of heavy rain, high winds, hail, and lightning. During this storm, security system components were generating
- false, nuisance alarms, and security personnel were responding and compensating for these alarms in accordance with the Security Plan. When rain / hail began to obscure camera visibility, a patrol was initiated to observe the protected area (PA) perimeter. The patrol also compensated for the loss of perimeter alarm multiplexers when they experienced communications failures. This patrol was continuous except when interrupted by brief periods ofintense storm activity.
At 1920 EDT, the security alarm stations received a supervisory alarm from a Unit 2 vital area door.
At 1928 EDT, a security officer responded to the scene in a patrol vehicle and saw that the door was closed, but was unable to investigate further due to the severe weather. At 1940 EDT, the oflicer entered the door and initiated compensatory actions.
At 1938 EDT, security alarm station operators were reviewing alarm printouts and discovered that a multiplexer for several Unit 2 VA door alarms had failed off-line at 1917 EDT, disabling the associated VA door alarms.
As a result of the failure to adequately respond to the initial VA door alarm within 10 minutes, and the failure to compensate for the multiplexer failure within 10 minutes, the NRC Operations Center was notified at 2023 EDT.
l
unc ream senA u.s. NUCLEAR REOULAToRY CoMM4 Salon (445) -
LICENSEE EVENT REPORT (LER)
TEXT CONTINUATION PACIUTY mAsst (1) 00 CME 1 Nuessen (3) Lam NUMGER (S) PAGE(3)
" W *iME,'
- D! "!2PJ Vogtle Electric Generating Plant - Unit 2 015l0l010l4l215 9l7 -
Sl0l1 -
010 13 oF l4 mi n - . e. ,, - .oac ro,. seaw n
- A recall of off duty security officers was initiated, and compensatory posts were established as security personnel became available. By 2132 EDT, all alarms were adequately compensated by roving patrols. By 2208 EDT, affected alarms had been compensated by security officer postings.
At 2320 EDT, a search of the protected area and affected vital areas was completed with no evidence of attempted intrusion found.
Following completion of repairs and testing, the affected door and multiplexer were returned to l service by 2134 EDT, on August 17,1997. All compensatory posts were terminated.
D. CAUSE OF EVENT The cause of this event was severe weather that resulted in numerous security system degradations which were not compensated within 10 minutes. All of the degradations could not be timely compensated due to personnel safety concerns caused by the severe weather. Also, the number of security personnel normally on shift cannot compensate for large numbers of failures.
E. ANALYSIS OF EVENT Security personnel responded to alarms and system failures as promptly as concerns for personnel
-safety allowed and as recalled personnel arrived. Furthermore, a search of the affected protected and vital areas found no evidence of unauthorized intrusion during this period of time. Based on these
- considerations, there was no adverse effect on plant safety or on the heahh and safety of the public as
-a result of this event.
F. CORRECTIVE ACTIONS
- 1) Compensatory actions were initiated as required per procedures. ,
- 2) A search of the affected areas found no evidence of attempted intrusion.
- 3) Following completion of resetting, repairing and testing, the affected VA door and multiplexer were returned to service by 2134 EDT, on August 17,1997. All compensatory posts were terminated.
l I
, 2
R,,
un pones assA U.S. NUCLEAR REGULATORY CoMML4 TON LICENSEE EVENT REPORT (LER)
TEXT CONTINUATION FACILITY hAME (1) DOCKET Num8ER (2) LER NumeER (s) PAGE (3)
"u%%," i *,ff,,3 Vogtle Electric Generating Plant - Unit 2 iui - . . . - .- , ~=c em n 0l5l010l0l4l2l5 9l7 _
Sl0l1 -
0l0 14 oF l4 G. ADDITIONALINFORMATION
- 1) Failed Components:
Comtrol I multiplexing system manufactured by Computrol Inc.
Multiplexer parts replaced include:
CDI common logic circuit board, part number 3000101 Fail Detect circuit board, part number 3000163 Modem circuit board, part number 30-0002-1 Coax switch, part number 60-0069-1
- 2) Previous Similar Events:
LER 50-424/1990-05S, dated 8-21-90.
LER 50-424/1990-11S, dated 12-7-90.
The corrective actions from these LERs were not applicable for the prevention of the event that occurred on August 16,1997,
- 3) Energy Industry Identification System Code:
Security System -IA