ML17334A411
| ML17334A411 | |
| Person / Time | |
|---|---|
| Site: | Cook  |
| Issue date: | 07/02/1982 |
| From: | Hunter R INDIANA MICHIGAN POWER CO. (FORMERLY INDIANA & MICHIG |
| To: | Harold Denton Office of Nuclear Reactor Regulation |
| References | |
| AEP:NRC:0670A, AEP:NRC:670A, NUDOCS 8207080110 | |
| Download: ML17334A411 (4) | |
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REGULATORY INFORMATION DISTRIBUTION 8 Y STEM (R CDS)
ACCE; STUN NdR:8207080110 DOC ~ DATE: 82/07/02 NOTARIZED:
NO FACIL:50 315 Donald C ~
CooK nuclear Power Plant~
Unit li Indiana 50-316 Donald CD Coox. Nuclear Power Plant~
Unit 2> Indiana AUTH BYNAME AUTHUR AFFILIATION HUNTER,R ~ S ~
Indiana K Michigan Electric Co.
RECIP ~ NA~E RECIPIKN f AFFILIATION DENTONtHeR ~
Office of Nuclear Reactor Regulationi Director
SUBJECT:
Explains util failure to provide fire dampers in intake 8
exhaust ventilation openings to emergency diesel generator rooms 1l informs ot plans to install seismically qualified fire-rated dampers
~
DISTRICT UTION CODE:
A001S COPIES RECEIVED:LTR Et CL SIZE:
TITLE: General Distribution for after Issuance of Operating License NOTES DOCKET 05000315 5vaoS RECIPIENT ID CODE/NAME ORU e1 OC 01 INTERhAL: E,LD/HDS3 NRR/DL DIR NRH/DS I/RAB RGN3 COPIES LTTR ENCL 7
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1 RECIP IENT ID CODE/NAPE NRR/DHFS DEPY08 NRR ORAQ G
F 04 COPIES LTTR ENCL EXTERNAL: ACHS NRC PDR NTIS 09 10 10 02 1
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27
INDIANA IIt MICHIGAN ELECTRIC COMPANY P. Q. BOX 18 BOWLING GREEN STATlON NEW YORK, N. Y. 10004 July 2, 1982 AEP:NRC:0670A Donald C. Cook Nuclear Plant Unit Nos.'
and 2
Docket Nos. 50-315 and 50-316 License Nos. DPR-58 and DPR-74 FIRE PROTECTION DIESEL GENERATOR ROOM HVAC AIR INTAKE AND EXHAUST DAMPERS Mr. Harold R. Denton, Director Office of Nuclear Reactor Regulation U.S. Nuclear Regulatory Commission Washington, D.C.
20555
Dear Mr. Denton:
During the NRC's Special Team Inspection concerning Appendix R at the Cook Plant in mid-April of 1982, the NRC personnel also included as part of their inspection several other fire protection related areas.
At the Exit Meeting with the Plant Staff, Mr. Jack Grobe of the NRC's Region III Staff raised a question concerning the need for fire dampers in the intake and exhaust ventilation openings to the Emergency Diesel Generator (EDG) Rooms of both Units.
No dampers presently exist in these openings.
The purpose of this letter is to advise you why we had not previously provided dampers and of our current plans to install seismically qualified, fire-rated dampers in these openings.
The subject dampers are required to be seismically qualified but 'as far as we have been able to ascertain, seismically qualified, fire-rated, curtain-type dampers were not available at the time of the design and construction of the Diesel Generator Room ventilation systems.
The decision was made to not install non-seismically qualified dampers in the ventilation intake and exhaust openings.
If these non-seismic dampers were to close accidentally during a seismic event, the required ventilation would be eliminated.
If this occurred during Diesel Generator operation, the Diesel Generator Room would heat up and probably affect Diesel Generator operation, possibly resulting in engine shutdown.
The Diesel Generator Room ventilation intakes are located on an outside wall, away from any fire exposures.
The intakes are above the Diesel Generator Room ceiling and, as demonstrated in previous concentration tests, do not promote carbon dioxide dilution in the event of operation of the suppression system.
j}oof 8207080iio 820702 PDR ADOCK 05000315 F
The Diesel Generator Room. ventilation exhausts discharge into the corridors between the Diesel Generator Rooms which are open to the east side of the Turbine Room basements.
These areas have been classified as a slight hazard potential in our Fire Hazards Analysis Report dated March 31, 1977.
The exhaust openings are located in the upper portion of the Diesel Generator Room walls and, as demonstrated in previous concentration tests, do not promote significant carbon dioxide dilution in the event of operation of the suppression system.
The results of the above-mentioned carbon dioxide concentration tests further supported our position of not installing non-seismic dampers in the intake and exhaust openings.
Seismically qualified dampers are now available and we will be installing seismically qualified, three hour fire-rated, curtain-type dampers in the intake and exhaust openings of the Diesel Generator Rooms of both Units.
In addition, we are planning to investigate whether there may be other areas in the Plant which result in a similar condition as discussed above and will take corrective action to resolve any that we find.
This letter has been prepared following Corporate Procedures which incorporate a reasonable set of controls to insure its accuracy prior to signature by the undersigned.
Very truly yours, R.
S. Hunter Vice President
/md cc:
John E. Dolan Columbus R.
W. Jurgensen W. G. Smith, Jr.
Bridgman R.
C. Callen G. Charnoff Joe Williams, Jr.
NRC Resident Inspector at Cook Plant Bridgman
ATTACHMENT 2 INDIANA II MlCHIGAN ELECTRIC COMPANY P. O.
BOX 1$
BOWLING GREEN STATION HEW'ORK, K Y. 10004 July 2, 1982 A:P:NRC:0670A Donald C.
Cook h'uclear Plant Unit hos.
1 and 2
Docket hos.
50-315 and 50-316 License Nos.
DPR-58 and DPR-74 FIRE PROTECTION - DIESEL GENEPJZOR ROOM HVAC AIR IhTAKE AND EXPAUST DAMERS Mr. Harold R. Denton, Director Office of Nuclear Reactor Regulation U.S,. Nuclear Regulatory Co~ission Vashington, D.C.
20555
Dear Mr. Denton:
During the hRC's Special Team Inspection concerning Appendix R at the Cook Plant in mid-April of 1982, the hRC personnel also included as part of their inspection several other fire protection'related areas.
At the Exit Meeting with the Plant Staff, Mr. Jack Grobe of the NRC's Region III Staff raised a question concerning the need for fire dampers in the intake and exhaust ventilation openings to the Emergency Diesel Generator (EDG)
Rooms of both Units.
No dampers presently exist in these openings.
The purpose of,this letter is to advise you why we had not previously provided doers"and >
ur curr s
install seismically qualified, fire-rated dampers in these openings.
The sub)ect da~ers are acquired to be seis=ically qualified but 'as far as we have been able to ascertain, seismically oualified,,
fire-rated, curtain-type dampers were not available at the t me of the design and construction of the, Diesel Generator
'Room ventilation syste s.
The decision was made to not install non-seis=ically qualified dampers in the ventilation intake and exhaust openi~gs.
If these non-seismic da pers were to close accidenta
~ ly during a seis ic event, the required ventilation should be eliminated.
If this occurred during Diesel Generator operation, the Diesel Generator Roo-would heat up and probably affect Diesel Generator operation; possibly resulting in engine shutdown The Diesel Generator Room ventilation ='..takes are located on an outside wall, away from any fire exposures.
The intakes are, above the Diesel.Generator Room ce=ling anc, as demons:"atec
'n ",rev'ous conc@...t:a-ic=
tes=s co nc: ""c=":e carbc".. dicxice cilution in the even:
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