ML20064N556
| ML20064N556 | |
| Person / Time | |
|---|---|
| Site: | Seabrook  |
| Issue date: | 02/14/1983 |
| From: | Devincentis J PUBLIC SERVICE CO. OF NEW HAMPSHIRE, YANKEE ATOMIC ELECTRIC CO. |
| To: | Knighton G Office of Nuclear Reactor Regulation |
| References | |
| SBN-467, NUDOCS 8302160274 | |
| Download: ML20064N556 (4) | |
Text
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smm sum IPUBLIC SERVICE
- .,:.2 U.,, om Companyof New: L.Wie 1671 Worcester Road Framinoham, Massachusetts 01701 (617) - 872 8100 February 14, 1983 SBN-467 T.F. B 7.1.2 United States Nuclear Regulatory Commission Washington, D. C. 20555 Attention:
Mr. George W. Knighton, Chief Licensing Branch 3 Division of Licensing -
Re ferences:
(a) Construction Permits CPPR-135 and CPPR-136, Docket Nos.
50-443 and 50-444 (b) PSNH Letter, dated February 1, 1983, "Open Item Responses:
(SRP 9.5.4, 9.5.5, 9.5.6; Power Systems Branch)",
J. DeVincentis to G. W. Knighton
Subject:
Revised Open Item Response:
(SRP 9.5.4, Power Systems Branch)
Dear Sir:
We have enclosed a revised response to the open item regarding preheating of the diesel engine combustion air in low ambient air temperature and no load conditions.
The enclosed revised response addresses the qualification of the diesel air preheating system and corrects typographical errors in the Reference (b) response.
The enclosed response will be included in OL Application Amendment 48.
Very truly yours, YANKES ATOMIC ELECTRIC COMPANY J. DeVincentis Project Manager v
ALL/fb cc: Atomic Safety and Licensing Board Service List 8302160274 830214 PDR ADOCK 05000443 A
4 ASLB SERVICE LIST Philip Ahrens, Esquire Assistant Attorney General Departrent of the Attorney General Augusta, ME 04333 Representative Beverly Hollingworth Coastal Chamber of Commerce 209 Winnacunnet Road Hampton, NH 03842 i
William S. Jordan, III, Esquire Harmon & Weiss 1725 I Street, N.W.
Suite 506 i
Washington, DC 20006 E. Tupper Kinder, Esquire Assistant Attorney General Office of the Attorney General 208 State House Annex Concord, NH 03301 Robert A. Backus, Esquire 116 Lowell Street i
P.O. Box 516 l
Manchester, NH 03105 Edward J. McDermott, Esquire Sanders and McDermott Profes6ional Association 408 Lafayette Road Hampton, NH 03842 Jo Ann Shotwell, Esquire Assistant Attorney Concral Environmental Protection dureau Department of the Attorney General One Ashburton Place, 19th Floor Boston: MA 02108
430.130 In Section >9.5.8.2 of the FSAR you state that the diesel generators are " capable of operating at its maximum rated output for the following service conditions and for the durations indicated during the following weather disturbances:
a.
Service Conditions:
1.
Ambient Air Intake:
-10 to 950F 2.
Humidity:
20 to 80%
b.
Weather Disturbances:
1.
A tornado pressure transient causing an atmospheric pressure reduction of 3 PSL in 3 seconds followed by a rise to normal pressure in 3 seconds.
2.
A hurricane pressure of 26 inches Hg for a duration of one (1) hour."
We find these service conditions unacceptable. The fellowing environmental services have been determined. to be more appropriate for Seabrook:
a.
Service Conditions:
1.
Humidity:
20 to 100%
b.
Weather Disturbances:
1.
A tornado pressure transient causing an atmospheric pressure reduction of 3 PSI in 1.5 seconds followed by a rise to normal pressure in 1.5 seconds.
2.
A hurricane or northeastern storm pressure of 26 inches Hg for a minimum duration of two (2) hours followed by a pressure of approximately 26 to 27 inches Hg for an -
extended period of time (approximately 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br />).
Provide the following:
a.
In light of recent weather conditions in the northeast (subzero temperatures) justify the lowcr limit of -10 F for the ambient air intake temperature.
If the temperature has to be revised downward, discuss the effects this will have on engine operation and output, and will air preheating be required to maintain engine performance, i
b.
Using the revised conditions stated above, discuss the ef fects they will have on engine operation and output.
I
RESPONSE
a.
A low ambient air intake temperature will have no af fect on engine operation under load, and output. Combustion air is preheated in the turbocharger and is supplied to the engine
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at a temperature of 100 minimum and 200 maximum.
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i The diesel engine manafacturer has advised that an air temperature of 500F or greater at the turbocharger inlet will result in suf ficient engine air temprature preheating to allow continuous no-load operation. Ambient air preheating l
to at least 500F will be provided by the installation of
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electric heaters in the air intake plenum. The neaters will I
be capable of raising the air temperature f rom the extreme l
low ambient temperature to at least 50 F, based on no-load combustion air flow. Heating elements will be powered by l
train-associated LE busses. Consistent with the design of the Combustion Air Intake System, the heaters will be
(
seismically supported such that following a seismic event the 1
operation of the diesel engine will not be degraded.
Automatic controls, cable and circuit breakers for electric heaters will be Class lE.
The heating elements will be automatically energized following engine start as a result of an "S" signal without loss of of f-site power.
Upon loss of of f-site power the electric heaters will be automatically tripped from the Class lE buses as preheating is not required when the diesel generatort, are carrying load. The automatic tripping of the combustion air preheaters will be periodically tested. An air temperature less than 500F at the turbacharger inlet will be alarmed.
b.
A tornado pressure transient of 1.5 seconds is less severe and will not af fect engine operation and output. A storm pressure of 26 inches Hg for a period of 14 hours1.62037e-4 days <br />0.00389 hours <br />2.314815e-5 weeks <br />5.327e-6 months <br /> may result in a reduction in mass flow of combustion air to the engine.
L svever, since the Combustion Air System is designed for approximately 50% excess air flow, this transient will not af fect engine operation and output. The engine may tend to smoke more than normal, but it will be capable of carrying rated load. A storm pressure of 26 inches Hg corresponds to an altitude of less than 4,000 feet. The e ngine manufacturer's derating tables indicate that no derating is required for an altitude up to 4,600 feet, FSAR Subsection 9.5.8.2 will be revised to reflect the c.
environmental conditions stated in the RAI.
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