ML20070N790
| ML20070N790 | |
| Person / Time | |
|---|---|
| Site: | Seabrook  |
| Issue date: | 01/21/1983 |
| From: | Devincentis J PUBLIC SERVICE CO. OF NEW HAMPSHIRE, YANKEE ATOMIC ELECTRIC CO. |
| To: | Knighton G Office of Nuclear Reactor Regulation |
| References | |
| SBN-428, NUDOCS 8301250606 | |
| Download: ML20070N790 (3) | |
Text
l MI SEABROOK STATION Enginsedng ONke:
1671 Worcester Rood M " M
- N " M 701 Pub 5c Service of New Hampshire (617) - 872 - 8100 January 21, 1983 SBN-428 T.F.
B7.1.2 United States Nuclear Regulatory Commission Washington, D. C. 20555 Attention:
Mr. George W. Knighton, Chief Licensing Branch No. 3 Division of Licensing
References:
(a) Construction Permits CPPR-135 and CPPR-136, Docket Nos. 50-443 and 50-444 (b)
PSNH Letter, dated November 12, 1982, " Response to Open Item (SRP 6.2.1; Containment Systems Branch),"
J. DeVincentis to G. W. Knighton
Subject:
Open Item Response:
(SRP 6.2.1; Containment Systems Branch)
Dear Sir:
We have enclosed a supplementary response to the open item ragarding the containment differential pressure resulting from an inadvertent operation of the containment spray. The initial response to this item was submitted in Reference (b).
This open item was discussed with representatives of the Containment Systems Branch in meetings conducted on January 10-12, 1983.
The enclosed response will be included in a future amendment to the OL Application.
Very truly yours, YANXEE ATOMIC ELECTRIC COMPANY
/
SJ 9301250606 930121 J. DeVincentis
{DRADOCK05000 Project Manager ALL/fsf cc: Atomic Safety and Licensing Board Service List 1000 Elm St., P.O. Box 330, Manchester, NH 03105 Telephone (603) 669-4000 TWX 7102207595
l
-r4 9) h The conte? ament is normally maintained at a slight positive pressure oy sne Containment On-Line Purge Subsystem. See FS.ut Section 9.4.5.2.C.2.
With this system in operation, the containment is maintained at a nominal positive pressure of 0.5 psig with high and low pressure alarma at 0.65 psig and 0.35 psig, h
respectively. Accordingly, if this system is in operation, the initial pressure
- , a inside containment in always positive as an initial starting condition.
However, because the above system is not redundant, the analysia f,or this event is based upon an initial containment ambient pressure of 14.7 f84f ' Initial
!8 0;-[
temperatures and relative humidity are 1200F and 90%. The analysis utilised the containment free volume, geometrical data and passive heat sink data as ES-provided in FSAR Tables 6.2-1, 6.2-3 and 6.2-4.
b u
8k Both spray trains are assumed to operate with a maximum flow rate of 3300 spa kk-L!'
per train. The analysis assumes the total capacity of the refueling water storage tank of 475,000 gallons is available for spray at a Ne/magtemperature h
of 500F (see FSAR Section 6.2.2.3).
Using the computer code CONT ltAST-5-NOD-1, e
the minimum resultant containment pressure of 12.1 paia results from the inad-vertent actuation of sprays.
f V
The above event produces a negative pressure differential of 2.6 psig. Thia is to be compared with the containment structure design differential. pressure of r;
- g-negative 3.5 peig (see FSAR 8ection 6,2.1.1,b.5).
This provides a nominal p:g negative pressure margin of 0.9 pais.
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b ASLB SERVICE LIST Philip Ahrens, Esquire Assistant Attorney General Department of the Attorney General Augusta, ME 04333 Representative Beverly Hollingworth Coastal Chamber of Commerec 209 Winnacunnet Road Hampton, NH 03842 William S. Jordan, III, Esquire Harmon & Weiss 1725 I Street, N.W.
Suite 506 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 i
116 Lowell Street P.O. Box 516 Manchester, NH 03105 Edward J. McDermott, Esquire Sanders and McDermott Professional Association 408 Lafayette Road l
Hampton, NH 03842 Jo Ann Shotwell, Esquire Assistant Attorney General Environmental Protection Bureau Department of the Attorney General i
One Ashburton Place, 19th Floor Boston, MA 02108 l
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