ML19263C285
| ML19263C285 | |
| Person / Time | |
|---|---|
| Site: | Pilgrim |
| Issue date: | 02/05/1979 |
| From: | Andognini G BOSTON EDISON CO. |
| To: | Ippolito T Office of Nuclear Reactor Regulation |
| References | |
| 79-36, NUDOCS 7902130191 | |
| Download: ML19263C285 (4) | |
Text
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BOSTON EDISDN C O M PANY GENERAL DrricEn 800 BovLaTDN STREET O D STON, M Ass ACHUBETTs 02199 G. CARL ANDOGNINI MANAGER NUCLEAR OPERATIONS DEPARTMENT February 5, 1979 BECo. Ltr. //79-3 6 Mr. Thomas A. Ippolito, Chief Operating Reactors Branch #3 Division of Operating Reactors Office of Nuclear Reactor Regulation U.S. Nuclear Regulatory Commission Washington, D. C.
20555 License No. DPR-35 Docket No. 50-293 Supplementary Information to Fire Protection Technical Specification Requirements Ref. (a) Boston Edison Company letter to USNRC titled Fire Protection, dated January 16, 1979.
Ref. (b) USNRC letter to Boston Edison Company Amendment 35, dated December 21, 1978.
Dear Sir:
On January 16, 1979, Boston Edison Company submitted the results of two analyses (Ref. a) as required by the safety evaluation supporting recently issued Amend-ment 35 (Ref. b).
To further clarify these analyses the following supplementary information is offered.
Item 3.2.6 Suppression of Charcoal Fire in Augmented Off-Gas Systems Assumptions
- 1) A puff release of all activity on charcoal delay beds.
- 2) No decay in transit to exclusion area boundary.
- 3) Utilized conservative greund level release X/Q.
- 4) Utilized conservative coolant activities.
/fbof. S 79021301H
' I
BosTbN EDISDN CO M PANY Mr. Thomas A. Ippolito, Chief February 5, 1979 Page 2 Methodology
- 1) Utilized Reg. Guide 1.3 method for calculating dose to whole body.
Results 1) 2 Rem dose to whole body at exclusion area boundary.
Item 3.2.3 Battery Room Ventilation Air Flow Monitor Assumptions
- 1) Worst hydrogen emission is during charging cycle of batteries with no room ventilation.
- 2) No hydrogen emission during battery discharge.
- 3) Less hydrogen emission during floating charge than during equalizing charge.
Methodology
- 1) Utilized Reg. Guide 1.120 requirement to maintain hydrogen concen-tration to well below 2% by volume.
- 2) Used manufacturer supplied figures for hydrogen emission per cell -
per hour at 77 F, total hydrogen emission in volume per hour is calculated (A).
Using limiting criteria in item 1 above, Volume of Hydrogen necessary to reach 2% concentration is calculated (B).
The ratio of A to B is then calculated to give the time required to reach 2% hydrogen concentration.
Results As detailed in original submittal (Ref. a).
Item 3.1.16 Self Contained Breathing Apparatus The design details are as follows:
Air Control Panel One (1) control panel for controlling air from the three (3) air banks through a pressure regulator into a manifold to accommodate four (4) hose assemblies, 30 feet long to the personnel using the respiratory protection mask.
The panel will have a series of gages, valves, quick disconnects and controls for efficient distribution of the air from the tanks to the user.
The four (4) 30 f t. hoses will have a 5000 PSI working pressure with a 4 to 1 safety factor.
The entire system will meet the Federal OSHA Standards.
The complete operation system will include 4 Scott hoseline units with emergency egress tanks.
BOSTON EDISON COMPANY Mr. Thomas A. Ippolito, Chief February 5, 1979 Page 3 Air Storage Module Assembly (Attachment I)
The module will contain 15 ea. D.O.T.
3AA 3600 PSI working, pressure, 352 cu.
ft. capacity storage bottles. Each bottle will contain a CGA 346 compressed air cutoff valve with the proper burst disc for safety. The bottles are de-signed for a 10% overfill if desired. This would give a 380 cu.
t.
per bottle storage capacity 0 3980 PSIG.
The 15 bottles will be securely fastened in a rectangular skid mounted frame assembly to accommodate lifting, either by fork lift or overhead crane, or hoist. The skid mounted frame will accommodate the storage bottles, each with individual fastening devices.
The bottles will be interconnected with pigtail and tee connectors in a series of three (3) banks of five (5) units.
Each bank will be individually connected to an air control panel mounted on the module package.
The skid mounted frame assembly will be cleaned, primed and painted.
Also mounted on casters for mobile opera-tion.
Air Storage Module Assembly - Constructed and provided in accordance with attached specifications and drawing.
(Cylinders to meet D01-3AA-3600 spec-ifications)
With mechanical arakes on rubber wheels to withstand maximum floor seismic accelerations of 0.35g horizontally and 0.29 vertically w*th frictional coefficient of about 0.4 or greater.
If you have any further questions on this subject please contact us at your convenience.
Very truly yours, Attachment
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