ML17054B510
| ML17054B510 | |
| Person / Time | |
|---|---|
| Site: | Nine Mile Point  |
| Issue date: | 03/20/1985 |
| From: | Schwencer A Office of Nuclear Reactor Regulation |
| To: | Hooten B NIAGARA MOHAWK POWER CORP. |
| References | |
| NUDOCS 8503280083 | |
| Download: ML17054B510 (10) | |
Text
Docket No. 50-410
,QR go le Mr. B. G. Hooten Executive Director-Nuclear Operations Niagara Mohawk Power Corporation 300 Erie Boulevard West
- Syracuse, New York 13202
Dear Mr. Hooten:
DISTRIBUTION
~Fi NRC PDR Local PDR PRC System NSIC LB¹2 Reading EHylton BBordenick BGrimes DWagner EJordan ACRS (16)
JPartlow
SUBJECT:
DIVISION I AND II DIESEL GENERATOR AIR DRYERS - NINE MILE POINT, UNIT NO.
2 In the Nine Mile Point 2 Safety Evaluation Report the staff states that the Division I and II Diesel Generator Air Start System must be equipped with air dryers, and furthermore, these air dryers are to be installed prior to preoperational testing.
By letter dated March 7, 1985 (C. Mangan, NMPC to A. Schwencer, NRC),
NMPC informed the staff that air dryers will be installed in the near future (1 to 2 months),
- however, they would not be installed prior to the scheduled performance of some preliminary tests.
The letter contained an outline of measures NMPC would accept to limit the total moisture in the air start system until the air dryers are installed.
The staff has reviewed the measures proposed in the March 7, 1985 letter and believes these measures will reduce the amount of entrained water in the air supply.
However, to provide additional assurance that the air in the air start system is relatively dry, we require that the pressure in the air receiver tank after condensate blowdown be at least 25 psi below pre-blowdown air receiver tank pressure.
This additional measure has been discussed with Mr. Norm Rademacher of your staff.
The Enclosure to this letter provides our basis for acceptance.
You should note that the measures found acceptable herein are to be used only until the air dryers are installed and that the approval of these measures is an expedient to allow the performance o'f some preliminary tests prior to air dryer installation.
Sincerely, 850m800as 850SaO PDR ADOCK 05000410 A
PDRI
Enclosure:
As stated A. Schwencer, Chief L>censing Branch No.
2 Division of Licensing cq:) gee next pa e
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Docket No. 50-410
,QR g l ]985 DISTRIBUTION Mr. B. G. Hooten Executive Director-Nuclear Operations Niagara Mohawk Power Corporation 300 Erie Boulevard West
- Syracuse, New York 13202
Dear Mr. Hooten:
oc et s
e NRC PDR Local PDR PRC System NSIC LB¹2 Reading EHylton BBordenick DWagner ACRS (16)
JPartlow BGrimes EJordan
SUBJECT:
DIVISION I AND II DIESEL GENERATOR AIR DRYERS - NINE MILE POINT, UNIT NO.
2 In the Nine Mile Point 2 Safety Evaluation Report the staff states that the Division I and II Diesel Generator Air Start System must be equipped with air dryers, and furthermore, these air dryers are to be installed prior to preoperational testing.
By letter dated March 7, 1985 (C. Mangan, NMPC to A. Schwencer, NRC),
NMPC informed the staff that air dryers will be installed in the near future (I to 2 months),
- however, they would not be installed prior to the scheduled performance of some preliminary tests.
The letter contained an outline of measures NMPC would accept to limit the total moisture in the air start system until the air dryers are installed.
The staff has reviewed the measures proposed in the March 7, 1985 letter and believes these measures will reduce the amount of entrained water in the air supply.
However, to provide additional assurance that the air in the air start system is relatively dry, we require that the pressure in the air receiver tank after condensate blowdown be at least 25 psi below pre-blowdown air receiver tank pressure.
This additional measure has been discussed with Mr. Norm Rademacher of your staff.
The Enclosure to this letter provides our basis for acceptance.
You should note that the measures found acceptable herein are to be used only until the air dryers are installed and that the approval of these measures is an expedient to allow the performance of some preliminary tests prior to air dryer installation.
Sincerely,
Enclosure:
As stated A. Schwencer, Chief Licensing Branch No.
2 Division of Licensing cq Gee next pa e
LB¹2/DL P
DWagner:dh inson'3/l 9/85 03/gg/85 C(AZQ m~
PS 8/D5'I AUngaro 03/~o/85 PSB/DSI MSrinivasan 03/~/85 LB¹2/DL ASchwencer 03/Q/85
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Docket No. 50-410 UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D. C. 20555 MAR 2 0 1985 Mr. B. G. Hooten Executive Director-Nuclear Operations Niagara Mohawk Power Corporation 300 Erie Boulevard West
- Syracuse, New York 13202
Dear Mr. Hooten:
SUBJECT:
DIVISION I AND II DIESEL GENERATOR AIR DRYERS - NINE MILE POINT, UNIT NO.
2 In the Nine Mile Point 2 Safety Evaluation Report the staff'tates that the Division I and II Diesel Generator Air Start System must be equipped with air dryers, and furthermore, these air dryers are to be installed prior to preoperational testing.
By letter dated March 7, 1985 (C. Mangan, NMPC to A. Schwencer, NRC),
NMPC informed the staff that air dryers willbe installed in the near future (1 to 2 months),
however, they would not be installed prior to the scheduled performance of some preliminary tests.
The letter contained an outline of. measures NMPC would accept to limit the total moisture in the air start system until the air dryers are installed.
The staff has reviewed the measures proposed in the March 7, 1985 letter and believes these measures will reduce the amount of entrained water in the air supply.
However, to provide additional assurance that the air in the air start system is relatively dry, we require that the pressure in the air-=-
receiver tank after condensate blowdown be at least 25 psi below pre-blowdown air receiver tank pressure.
This additional measure has been discussed with Mr. Norm Rademacher of your staff.
The Enclosure to this letter provides our basis for acceptance.
You should note that the measures found acceptable herein are to be used only until the air dryers are installed and that the approval of these measures is an expedient to allow the performance of some preliminary tests prior to air dryer installation.
Sincerely,
Enclosure:
As stated cc:
See next page A. Schwencer, Chief Licensing Branch No.
2 Division of Licensing
Nine Mile Point 2
Mr. B. G. Hooten Executive Director, Nuclear Operations Niagara Mohawk Power Corporation 300 Erie Boulevard West
- Syracuse, New York 13202 CC:
Mr. Troy B. Conner, Jr.,
Esq.
Conner 8 Wetterhahn Suite 1050 1747 Pennsylvania
- Avenue, N.W.
Washington, D.C.
20006 Ri chard Gol dsmi th Syracuse University College of Law E. I. White Hall Campus
- Syracuse, New York 12223 t
Ezra I. Bialik Assistant Attorney General Environmental Protection Bureau New York State Department of Law 2 World Trade Center New York, New York 10047 Resident Inspector
. Nine Mile Point Nuclear Power Station P. 0.
Box 99
- Lycoming, New York 13093 Mr. John W. Keib, Esq.
Niagara Mohawk Power Corporation 300 Erie Boulevard West
- Syracuse, New York 13202 Jay M. Gutierrez, Esq.
U. S. Nuclear Regulatory Commission Region I 631 Park Avenue King of Prussia, Pennsylvania 19406 Norman Rademacher, Licensing Niagara Mohawk Power Corporation 300 Erie Boulevard West
- Syracuse, New York 13202
~ '
NIAGARA MOHAWK POWER CORPORATION NINE MILE POINT.2 DIVISION I AND II DIESEL GENERATOR AIR DRYERS In the Nine Mile Point 2 Safety Evaluation Report (SER), the staff states that the Division I and II Diesel Generator Air Start System must have air dryers and that these air dryers should be installed prior to preoperational testing.
By letter dated March 7, 1985 (C. Mangan, NMPC to A. Schwencer, NRC),
the applicant informed the staff that air dryers would be installed within I to 2 months, however, installation would not be completed prior to the scheduled performance of some preliminary testing.
To limit the total moisture in the air start system, the applicant proposed performing additional measures until the air dryers are installed.
The applicant's proposal involved compressing,
- cooling, and condensate blow-down to reduce the moisture in the system.
Specifically, the applicant proposed maintaining the ambient temperature of the diesel generator room below 60'F which would limit the maximum amount of water entrained as moisture in the supply air (to the compressor) to.85 lb/1000 ft3.
Compressing this air and cooling back to 60'F would result in.051 lb/1000ft3 of entrained moisture.
Most of the water entrained prior to compression will appear as condensate in the air receiver tank after compression and cooling.
To ensure that reasonably dry air is utilized for starting, a four hour hold time will be imposed after charging the air receivers.
After this four hour hold time, the condensate in the'ir receiver tanks will be blown down, to eliminate any liquid in the system.
The staff has reviewed the applicant's proposal and finds it to be an acceptable method of reducing moisture in the air start system prior to installation of air dryers.
However, to provide additional assurance that the air in the system is relatively dry, we suggest that the pressure in the air receiver tank after blowdown be at least 25 psi less than the pre-blow-down pressure.
The expansion of air in the air receiver tank will further ensure that this air is well above saturation at that pressure and temperature.
The applicant should be aware that this moisture reduction process is to be used only until the air dryers are installed and that this process is an expedient to allow the performance of preliminary testing prior to air dryer installation.
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