ML17332A237
| ML17332A237 | |
| Person / Time | |
|---|---|
| Site: | Cook  |
| Issue date: | 07/29/1994 |
| From: | Blind A IMPERIAL PROFESSIONAL COATINGS |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| NUDOCS 9408030252 | |
| Download: ML17332A237 (3) | |
Text
LC.J.~~ J. A (ACCELERATED RIDS PROCESSING)
REGULATORY INFORMATION DISTRIBUTION SYSTEM (RIDS)
ACCESSION NBR:9408030252 DOC.DATE: 94/07/29 NOTARIZED: NO FACIL:50-315 Donald C.
Cook Nuclear Power Plant, Unit 1, Indiana M
50-316 Donald C.
Cook Nuclear Power Plant, Unit 2, Xndiana M
AUTH.NAME AUTHOR AFFILIATION BLIND,A.A.
Imperial Professional Coatings RECXP.NAME RECIPIENT AFFILIATION Document Control Branch (Document Control Desk)
DOCKET 05000315 05000316 P
SUBJECT:
Special rept:on 940712,two meteorological towers sustained lightning strikes, which damaged number of components in sys.
On 940719,another lightning strike occurred making sys inoperable. Repairs made
& sys declared operable.
DISTRIBUTION CODE:
IE22D COPIES RECEIVED: LTR Q ENCL S SIZE: ek TITLE: 50.73/50.9 Licensee Event Report (LER), Incident Rpt, etc.
NOTES:
RECIPIENT ID CODE/NAME PD3-1 PD INTERNAL: AEOD/DSP/TPAB NRR/DE/EELB NRR/DORS/OEAB NRR/DRCH/HICB NRR/DRSS/PRPB NRgyQ3SSA/SRXB REG FILE+
02 RGN3~."ILE 01 EXTERNAL: EGGG BRYCE,J.H NRC PDR NSIC POORE,W.
COPIES LTTR ENCL RECIPIENT XD CODE/NAME HXCKMAN,J AEOD/ROAB/DSP NRR/DE/EMEB NRR/DRCH/HHFB NRR/DRCH/HOLB NRR/DSSA/SPLB NRR/PMAS/XRCB-E RES/DSIR/EIB L ST LOBBY WARD NSIC MURPHY,G.A NUDOCS FULL TXT COPIES LTTR ENCL D
0 U
N NOTE TO ALL"RIDS RECIPIENTS:
PLEASE HELP US TO REDUCE iVASTE!CONTACTTHE DOCUMENTCONTROL DESK, ROOM P 1-37 (E>iT. 504-2083 ) TO EL!MIVATEYOUR VAMEFROM DISTRIBUTIONLISTS FOR DOCUMENTS YOU DON"I'L'ED!
TOTAL NUMBER OF COPIES REQUIRED:
LTTR 26 ENCL
Indiana Michigan Power Company ~
Cook Nuclear Plant~
One Cook Place Bridgrnan, Ml 49106 616 465 5901 INDIANA NICHIGAN POWER July 29, 1994 Donald C.
Cook Nuclear Plant Unit Nos.
1 and 2
Docket Nos.
50-315 and 50-316 License Nos.
DPR-58 and DPR-74 Special Report Technical Specification 3.3.3.4 U.S. Nuclear Regulatory Commission Attn: Document Control Desk Washington D.C.
20555 Gentlemen:
This special report is being submitted in good faith relative to Action Statement "b" of Technical Specification (TS) 3.3.3.4, Meteorological Instrumentation.
Action Statement "b" of TS 3.3.3.4 requires the preparation and submittal of a special report pursuant to Specification 6.9.2 following the inoperability of the meteorological monitoring channels that exists for more than 7
(seven) days.
On the evening of July 12 at 2010
- hours, two of the plant meteorological towers sustained lightning strikes, which damaged a
number of components in the system.
After extensive repairs, the system was declared operable on July 19 at 1721 hours0.0199 days <br />0.478 hours <br />0.00285 weeks <br />6.548405e-4 months <br />.
Subsequent to the declaration of operability, another lightning strike occurred on July 19 at 2100
- hours, again making the system inoperable.
After additional repairs were
- made, the system was again declared operable on July 23 at 1630 hours0.0189 days <br />0.453 hours <br />0.0027 weeks <br />6.20215e-4 months <br />.
The meteorological monitoring instrumentation channels were inoperable for. 6 (six) days, 21 (twenty-one) hours and 11 (eleven) minutes followed by a short duration of operability.
It is in light of the short duration of operability surrounded by periods of inoperability that this letter is being written, even though a
special report requirement per Action Statement "b" of TS 3.3.3.4 was not technically required.
The meteorological channel inoperability events pointed to 2 (two) areas of concern:
1)
The level of spares kept on hand to repair the system.
Because of the high number of lightning strikes in a short period of time, more equipment was damaged than spares available.
Based on this, the quantity and availability of spare parts is being evaluated.
94080>0252 940729 PDR ADOCK 05000315 S
Special Report July 29, 1994 Page 2 of 2 2)
The lightning protection system of the meteorological towers.
Based on the amount of damage, an engineering evaluation of the lightning protection for the meteorological towers was performed.
A preliminary walkdown of the system has brought out a
number of shortcomings.
Based on
- this, the susceptibility of the meteorological towers to a lightning strike is being evaluated.
Respectfu ly A.
land Site Vice President/Plant Manager c
E.
E. Fitzpatrick J.
B. Martin, Region III NRC Resident Inspector G. Charnoff J.
R. Padgett NFEM Section Chief