ML20206D456
| ML20206D456 | |
| Person / Time | |
|---|---|
| Site: | Seabrook  |
| Issue date: | 06/17/1986 |
| From: | George Thomas PUBLIC SERVICE CO. OF NEW HAMPSHIRE |
| To: | Noonan V Office of Nuclear Reactor Regulation |
| References | |
| SBN-1119, NUDOCS 8606200002 | |
| Download: ML20206D456 (4) | |
Text
.
George S. Thomas Vlce President Nuclear Production Put2c Service of New HampsNro N;w Hampshire Yankee Division June 17, 1986 SBN-1119 T.F.
B7.1. 3 United States Nuclear Regulatory Commission Washington, DC 20555 Attention:
Mr. Vincent S. Noonan, Project Director PWR Project Directorate No. 5
References:
(a) Construction Permits CPPR-135 and CPPR-136, Docket Nos. 50-443 and 50-444 Subj ect :
Feedwater Isolation Valves
Dear Sir:
Enclosed please find a revision to FSAR Section 6.2 concerning the closure of the Feedwater Isolation Valves (FWIVs). We are revising the closure time to be consistent with the response time specified in Table 15.0-8.
This revision to Section 6.2 will be incorporated into the PSAR via a future amendment.
Very truly yours, I
-Q
/
George S. Thomas Enclosure
^
cc:
Atomic Safety and Licensing Board Service List 8606200002 860617 PDR ADOCK ODOOO443 A
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i P.O. Box 300 + Seabrook,NHO3874 Telephone (603)474-9521
- Dicco Currsn, Esquiro Patsr J. Math *wo, M:yor
- Hsroon & Welco City Hsil 2001 S. Street, N.W.
Newburyport, MA 01950 Suite 430 Washington, D.C.
20009 Judith H. Mizner Silvergate, Gertner, Baker, Sherwin E. Turk, Esq.
Fine, Good & Mizner Office of the Executive Legal Director 88 Broad Street U.S. Nuclear Regulatory Commission Boston, MA 02110 Tenth Floor Washington, DC 20555 Calvin A. Canney City Manager Robert A. Backus, Esquire City Hall 116 Lowell Street 126 Daniel Street P.O. Box 516 Portsmouth, NH 03801 Manchester, NH 03105 Stephen E. Merrill, Esquire Philip Ahrens Esquire Attorney General Assistant Attorney General George Dana Bisbee, Esquire Department of The Attorney General Assistant Attorney General Statehouse Station #6 Office of the Attorney General Augusta, ME 04333 25 Capitol Street Concord, NH 03301-6397 Mrs. Sandra Gavutis Chairman, Board of Selectmen Mr. J. P. Nadeau RFD 1 - Box 1154 Selectmen's Office Kennsington, NH 03827 10 Central Road Rye, NH 03870 Carol S. Sneider, Esquire Assistant Attorney General Mr. Angie Machiros Departsent of the Attorney General Chairman of the Board of Selectmen One Ashburton Place, 19th Floor Town of Newbury N wbury, MA 01950 Boston, MA 02108 e
Senator Gordon J. Humphrey Mr. William S. Lord U.S. Senate Board of Selectmen Washington, DC 20510 Town Hall - Friend Street l
(ATTN: Tom Burack)
Amesbury, MA 01913 Richard A. Hespe, Esq.
Senator Gordon J. Humphrey Hampe and McNicholas 1 Pillsbury Street 35 Pleasant Street Concord, NH 03301 Concord, NH 03301 (ATTN: Herb Boynton)
Thomas F. Powers, III H. Joseph Flynn, Esquire Town Manager Office of General Counsel Town of Exeter Federal Emergency Management Agency 10 Front Street 500 C Street, SW Exeter, NH 03833 Washington, DC 20472 Brentwood Board of Selectmen Paul McEachern, Esquire RFD Dalton Road Matthew T. Brock, Esquire Brentwood, NH 03833 Shaines & McEachern 25 Maplewood Avenue Gary W. Holmes, Esq.
P.O. Box 360 Holmes & Ells Portsmouth, NH 03801 47 Winnacunnet Road Hampton, NH 03842 Robert Carrigg Town Office Mr. Ed Thomas Atlantic Avenue FEMA Region I North Hampton, NH 03862 442 John W. McCormack PO & Courthouse Boston, MA 02109
SB 1 & 2 Amendment 59 hpfC)C&OPg,M $$A/ //'N3 T
FSAR May 1986 can result in more severe conditions in the contain-ment.
In this analysis, a loss of off-site power j
has been assumed to concur with the MSI, whenever it results in more severe containment conditions, in addition to a single active fr.ilure in the safety systems.
However, for the conservative estimation of mass and energy releases, of f-site power is assumed to be available.
The safety-related equipment relied upon to mitigate the consequences of an MSLB include those required for isolation of the main feedwater lines and the main steam lines, delivery of emergency feedwater into the steam generators, and delivery of spray water into the containment. The containment spray system is the only active heat removal system for which credit has been taken in mitigating the consequences of a MSLB. The signal to isolate the main feedwater lines and the main steam lines and to start the emergency feedwater system is generated by the reactor protection system for all double-ended ruptures listed in Table 6.2-11.
For the split ruptures, this isolation signal is conservatively assumed to be generated when the containment pressure reaches the Hi-1 set point of 6.8 psig for isolation of feedwater lines and Hi-2 set point of 7.4 psig for isolation of main steam lines, although the nominal values for the Hi-1 and Hi-2 set points are 4.3 psig.
After the isolation set point is reached, a delay of 1.0 second for instrument reponse and signal processing has been 54,59 allowed.
The containment spray actuation signal
("P" signal) is generated when the containment pressure reaches the Hi-3 set point, as discussed in Subsection 6.2.1.lc.1(b).
3 The isolation of the main feedwater lines is achieved by tripping the main feedwater pumps and closing the feedwater control valves (FCVs) and the feed-8 Seco M 3 CLO419-water isolation valves (FWIVs). The pump trip is issnediate. The FCVs are capable of closing W42.(f-f k completely with 5 secondo after receipt of the isolation signal, and the FWIVs within,"^ ::c:" :.
- M SL
(,
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Fatture to trip a main feeowater pump would result in more main feedwater being pumped into the steam generators and an increase in the blowdown.
" ilur:
ef 9: i.umen-ioop 167 -vold..uis L. let--
I=gl=*Ian nF Phm main f a m A um em.- lin ;- J, p;;;[tly, 1=-gme -"- t :f retx t;in;; pu_.;;d int; th; a
.uums.ius.
Failure of the broken-
' " *md loop FWIV would allow additional feedwater, namely that in the piping between the FWIV and FCV, to flash into the steam generato :.
Loss of of f-site 3
power, however, would result in less feedwater 6.2-15
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