ML17258A176
| ML17258A176 | |
| Person / Time | |
|---|---|
| Site: | Ginna  |
| Issue date: | 09/17/1981 |
| From: | Maier J ROCHESTER GAS & ELECTRIC CORP. |
| To: | Crutchfield D Office of Nuclear Reactor Regulation |
| References | |
| TASK-09-05, TASK-9-5, TASK-RR NUDOCS 8109220560 | |
| Download: ML17258A176 (9) | |
Text
REGUlAY INFORMATION'ISTRIBUTI(SYSTEM. (RIBS)
ACCESSION>> NBR; 8109220S60.
DOC ~ DATEir 81/09/17 NOTARIZED!
'ACIL(:50.-254 Robert" Klnmg,t'innai Nucl ear
~ Pl anti Uni t lr. Roc AUTH>>,NAME!
AUTHOR' F F ILIAT'I ON HAIER'r J ~ E'R Rochester'Gas L El'ectr ic Corp',
RECIP ~ NAME(
RECIPIENT AFFILIAT'IDN-CRUTCHF IELO'r D, O~erating, Re'actors Branch 5
SUBJECT:
I Forwards". response to NRC) 810805 ltr re, SEP Topic'Ventilationv"',
as discussed in 810828 telcons<-
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ROCHESTER GAS AND ELECTRIC CORPORATION o
89 EAST AVENUE, ROCHESTER, N.Y. l4649 JOHN F..
MAIER VICE PRESIDENT TELEPHONE ARE* CooC Tld 546.2700 a
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zi September 17, 1981 7<'
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Director of Nuc lear Reactor Regulation Attention:
Dennis M. Crutchfield, Chief Operating Reactors Branch No.
5 U.
S. Nuclear Regulatory Commission Nashington, D.C.
20555
Subject:
SEP Topic IX-5, Ventilation R.
E. Ginna Nuclear Power Plant Docket No. 50-244
Dear Mr. Crutchfield:
This letter responds to the NRC's request for additional information for this SEP topic, transmitted to RGGE by letter of August 5, 1981.
The response to the NRC ouestions was discussed between RG&E personnel, Mr. Clyde Herrick of FRC, and Mr. Stewart Brown of the NRC by telephone conversations on August 28, 1981.
The attachment serves to document this conversation.
Very truly yours, Attachment j}p35 S
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Attachment:
Response
to August 5, 1981 Letter, SEP Topic IX-S, Ventilation Systems B
ass Duct Dam er, Auxiliar Buildin Main Exhaust Fan S stem Dwg. 33013-533 indicates that the bypass damper is controlled by the Auxiliary Building charcoal filter fans.
These are presumed to be the redundant fans on the lower floors of the auxiliary building.
(1) Is this correct?
(2) Please clarify the operation of the main fan bypass
- damper, and verify that it will be open for safe shutdown.
Response
The Auxiliary Building charcoal filter fans are redundant.
The main bypass damper is activated by the charcoal filter fan's motor starters.
Actuation of the fans causes opening of the damper.
2.
Auxiliar Buildin Main Exhaust Line Positive Pressure During shutdown of the reactor using onsite diesel generated
- power, the main exhaust
- fans, 1A and 1B will be shut down, their respective dampers will be closed and the main fan bypass duct damper will be open.
The remaining exhaust fans on three separate lines leading to the main HEPA filter
'ontinue to operate.
The loss of suction from the main exhaust fans now causes a positive back pressure on each line in the duct leading to the main HEPA filter.
Please verify that the pressure produced here cannot cause backflow through any one operating fan.
This is related to the flow vs. pressure characterisitcs of the fans used.
Response
The information is not available at this time.
An evaluation of the flow vs. pressure characteristics of the respective fan will be undertaken shortly. It is expected that a response can be provided by 10/15/81.
3.
Descri tion, Auxiliar Buildin Exhaust Fan 1G Please provide a complete description of Exhaust Fan 1G, including the variable blade angle or variable inlet vane control.
How is its differential pressure control tied to the control of the exhaust system?
What percentage of the flow area remains with the inlet vanes closed or the blades in flattest pitch?
Response
Exhaust fan 1G uses variable blade angle control.
At its flattest pitch, 85/% of the inlet area is closed.
Differential pressure control is via a venturi tube, which controls fan differential pressure to 4Q inches of water.
~~0 I
4.
Auxiliar Buildin Dam er Control in Two Lines Leadin to the New Charcoal-HEPA Filter Drawing 33013;533, dated 1975 shows revisions to the system as compared to; system descriptions in the FSAR;
'Dwg. 33013-533 show's"a charcoal-HEPA filter fed by two exhaust~lines, one from 'the-g'eneral operating floor,'oric acid, and drumming
- areas, and the other from a wide range of intermediate floor and basement areas..
Both lines, retain their respective actuator operated dampers just before the charcoal-HEPA filter.
The drawing indicates "motor starter" as the con-trolling means for each damper.
Since, in the system revision, the respective fans in each line were removed, what motor starter or starters are now used for each damper?
Is it Fan 1G or some other control element?
Response
Fan 1G controls 'the dampers in both lines.
5.
H dro en Recombiner Control Panel Please describe the ventilation and cooling needs.
Response
Intermediate Building ventilation should maintain the environment in the area of the recombiner panel to less than 104 F.
6.
Air Su l
Intermediate Buildin Fan 1C It was not determined in the'isit to Ginna whether the air source is from the turbine building or whether it is now outside air.
Please indicate the present source.
Response
Outside air, drawn via louvres in the Intermediate Building, provide the necessary makeup air.
7.
Res onse to Radiation Monitors R13 and R14 Please provide an outline of the exhaust system response to monitors R13 and R14, plus a brief statement as to the rationale.
Response
The following is a table of the plant ventilation system response for a high alarm on either R-13 or R-14:
The general philosophy is to maintain the auxiliary building and the intermediate building at slightly negative pressures, to prevent out leakage of radioactivity, and to trip all fans except those exhausting to the plant vent via charcoal filters.
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VENTILATION E UIPMENT 1A or 1B Auxiliary Building Main Exhaust Fan 1C Auxiliary Building Exhaust Fan 1G Auxiliary Building Exhaust Fan 1F Auxiliary Building Exhaust Fan 1A Auxiliary Building Supply Air Handling Unit 1B Auxiliary Building Supply Fan 1A or 1B Intermediate Building Exhaust, Fan 1C Intermediate Building Exhaust Fan 1A or 1B Controlled Access
- Exhaust, Fan 1A or 1B Auxiliary Building Charcoal Filter Fans X
X X
X X
X X
"FILTER-
"FILTER-OUT" IN" X Indicates the fan or Air Handling unit will trip No marking Indicates the fan or air handling unit will remain in service.
In addition, a high alarm on R-14 will close the Gas Decay Tank Release Valve RCV-014.