ML20212K897
| ML20212K897 | |
| Person / Time | |
|---|---|
| Site: | Seabrook  |
| Issue date: | 08/19/1986 |
| From: | Nerses V Office of Nuclear Reactor Regulation |
| To: | Harrison R PUBLIC SERVICE CO. OF NEW HAMPSHIRE |
| References | |
| NUDOCS 8608250110 | |
| Download: ML20212K897 (7) | |
Text
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UNITED STATES p,
NUCLEAR REGULATORY COMMISSION g
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WASHING TON, D. C. 20555 L,
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%n" Agg y Docket Nos.:
50-443 and 50-444 Mr. Robert J. Harrison President & Chief Executive Officer Public Service Company of New Hampshire P.O. Box 330 Manchester, NH 03105
Dear Mr. Harrison:
SUBJECT:
SEABROOK EMERGENCY AND STARTUP FEEDWATER PUMPS Ref.:
DeVincentis, John, " Auxiliary Feedwater System Technical Specifi-cations",i.etter from Public Service Company of New Hampshire to Vincent S. Noonan of NRC, SBN-1141, June 25, 1986.
Our review of the Seabrook Technical Specifications (TS) and the Final Safety Analysis Report (FSAR) identified a discrepancy which indicated that the TS value is not in agreement with the Design Bases as reported in the FSAR.
Further investigation has revealed that the FSAR information as reported in Figure 6.8-2 and Table 6.8-1 is the source of the difficulty. The "as built" plant characteristics are different. The information we have is that the actual plant behavior, the TS requirements, and the Design Bases are consistent. We request that you confirm that our understanding of the situation as described below is correct.
If we are correct, the FSAR should be modified accordingly.
Design basis calculations are conducted on a conservative basis to assure adequate protection of the health and safety of the public.
In the case of the Emergency Feed Water (EFW) pumps, applicable calculations must be based upon pump characteristics which are equal to or more conservative than the actual pumps. Similarly, the characteristics required in the TS must be equal to or more restrictive than those used in the design bases. Difficulty was encountered when we found that the TS and actual pump characteristic were less conservative than the pump performance reported in Figure 6.8-2 and Table 6.8-1 of the Seabrook FSAR. This is illustrated in Figure 1 (a mark-up of Figure 6.8-2) which is attached to this letter.
Our immediate concern of whether the Figure 6.8-2 information was used in the i
design basis of the plant was alleviated when you assured us that such was not l
the case, and that the design basis involved only two situations as described at the end of Section 6.8-2 of the FSAR (Amendment 58, April 1986):
l 86082501to e60019 PDR ADOCK 05000443 A
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Mr. Robert J. Harrison "The open position of the flow control valves for system limiting conditions will be set to ensure a minimum total reauired flow of 470 gpm to three (3) steam generators and a minimum total flow of 650 gpm to four (4) steam generators with one (1) EFW pump operational."
You further informed us that the limiting condition was the pressure setpoint of the lowest steam generator safety valve (1185 psi) plus 3%, which was stated to be equal to a head of 2848 ft at the steam generator feedwater nozzle.
You provided additional FEW and Startup Feed Water (SFW) pump information via the Reference letter.
Selected information is approximated in Figure 1, which should be used only for gross comparisons since the accuracy is not sufficient for other purposes.
Clearly, the turbine driven EFW pump is better than the motor driven pump, and the latter must be used for comparisons.
The motor driven EFW pump line represents an in-plant test. The conservatively calculated head at the pump for a fixed steam generator (SG) pressure corresponding to 2848 ft., shown as the bottom line, intersects the motor driven pump curve at roughly 700 gpm, which is in excess of the design basis requirement.
The TS EFW curve is an assumed displacement of the motor driven EFW curve which intersects the SG curve at approximately 650 gpm, thus meeting the design basis requirement. The TS curve is to be verified periodically by operating the pump discharging to the bypass line, thus verifying operation at a point on or above the curve at a flow rate of less than 300 gpm. We were informed verbally that the full flow capability via the SG path would be verified experimentally whenever the plant was restarted from a cold shutdown condition. We consider both of these operations to be necessary since the curve is an assumed one which is supposed to represent an allowable degraded pump characteristic.
Please indicate whether you plan to accomplish these items, and, if so, what assures that accomplishment.
The SFW curve appears to represent a test prior to installation in the Seabrook plant. Note the flow rate at higher pressures is less than that for the EFW pumps. This could be of significance since, to our knowledge, there are no test data which represent startup feedwater flow rate when operated with discharge to the steam generators via the EFW flow path.
Mr. Robert J. Harrison We request either that such tests be conducted or that detail calculations be provided which establish the behavior under conditions similar to those for the EFW pumps under design basis assumptions. Please indicate your plans in this area.
V Victor Nerses, Project Manager PWR Project Directorate No. 5 Division of PWR licensing-A
Enclosure:
As stated cc: See next page t
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Mr. Robert J. Harrison Public Service Company of New Hampshire Seabrook Nuclear Power Station cc:
Thomas Dignan, Esq.
E. Tupper Kinder, Esq.
John A. Ritscher, Esq.-
Assistant Attorney General G. Dana Bisbee, Esq.
Ropes and Gray 225 Franklin Street Office of Attorney General Boston, Massachusetts 02110 208 State Posue Annex Concord, New Hampshire 03301 Mr. Bruce B. Beckley, Project Manager Public Service Company of New Hampshire Resident Inspector Post Office Box 330 Seabrook Nuclear Power Station Manchester, New Hampshire 03105 c/o US Nuclear, Regulatory Commission Post Office Box 700 Dr. Mauray Tye, President Seabrook, New Fampshire 03874 Sun Valley Association 209 Summer Street Mr. John DeVincentis, Director Haverhill, Massachusetts 01839 Engineering and I.icensing Yankee Atomic Electric Company Robert A. Backus, Esq.
1671 Worchester Road O'Neil, Backus and Spielman Framingham, Massachusetts 01701 116 lowell Street Manchester, New Hampshire 03105 Mr. A. M. Ebner, Project Manager United Engineers & Constructors William S. Jordan, III 30 South 17th Street Diane Curran Post Office Box 8223 Parmon, Weiss & Jordan Philadelphia, Pennsylvania 19101 20001 S Street, NW Suite 430 Washington, D.C.
20009 Mr. Philip Ahrens, Esq.
Assistant Attorney General State House, Station #6 Augusta, Maine 04333 Jo Ann Shotwell, Esq.
Office of the Assistant Attorney General Environmental Protection Division Mr. Warren Fall One Ashburton Place Public Service Company of Boston, Massachusetts 02108 New Hampshire Post Office Box 330 D. Pierre G. Cameron, Jr., Esq.
Seabrook, New Hampshire 03874 General Counsel Public Service Company of New Hampshire Seacoast Anti-Pollution league Post Office Box 330 Ms. Jane Doughty Manchester, New Pampshire 03105 5 Market Street Portsmouth, New Hampshire 03801 Regional Administrator, Region I U.S. Nuclear Regulatory Coninission Mr. Diana P. Randall 631 Park Avenue 70 Collins Street King of Prussia, Pennsylvania 19406 Seabrook, New Hampshire 03874 Richard Hampe, Esq.
New Hampshire Civil Defense Agency 107 Pleasant Street Concord, New Hampshire 03301 l
r Public Service Company of Seabrook Nuclear Power Station New Hampshire t
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cc:
Mr. Calvin A. Canney, City Manager Mr. Alfred V. Sargent, City Hall Chairman 126 Daniel Street Board of Selectmen Portsmouth, New Hampshire 03801 Town of Salisbury, MA 01950 Ms. I.etty Hett Senator Gordon J. Humphrey Town of Brentwood ATTN: Tom Burack RFD Dalton Road U.S. Senate Brentwood, New Hampshire 03833 Washington, D.C.
20510 Ms. Roberta C. Pevear Mr. Owen B. Durgin, Chairman Town of Hampton Falls, New Hampshire Durham Board of Selectmen Drinkwater Road Town of Durham Hampton Falls, New Hampshire 03844 Durham, New Hampshire 03824 Ms. Sandra Gavutis Charles Cross, Esq.
Town of Kensington, New Hampshire Shaines, Mardrigan and RDF 1 McEaschern East Kingston, New Hampshire 03827 25 Maplewood Avenue Post Office Box 366 Portsmouth, New Hampshire 03801 Chairman, Board of Selectmen RFD 2 South Pampton, New Hampshire 03827 Mr. Guy Chichester, Chaiman Rye Nuclear Intervention Mr. Angie Machiros, Chairman Comittee Board of Selectmen c/o Rye Town Hall for the Town of Newbury 10 Central Road Newbury, Massachusetts 01950 Rye, New Hampshire 03870 Ms. Cashman, Chairman Jane Spector Board of Selectmen Federal Energy Regulatory Town of Amesbury Commission Town Hall 825 North Capital Street, NE Amesbury, Massachusetts 01913 Room 8105 I
Honorable Peter J. !!atthews Mayor, City of Newburyport Mr. R. Sweeney Office of the Mayor New Hampshire Yankee Division City Hall Public Service of New Hampshire l
Newburyport, Mass 6chusetts 01950 Company 7910 Woodmont Avenue Mr. Donald E. Chick, Town Manager Bethesda, Maryland 20814 Town of Exeter 10 Front Street Mr. William B. Derrickson Exeter, New Hampshire 03823 Senior Vice President Public Service Company of New Hampshire Post Office Box 700, Route 1 Seabrook, New Hampshire 03874
FIG.
1 AP P R O XI M ATE S EAB ROO K EFW
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AND STARTU P FW~ PUMP B EH AVIO R 3800 LEGEND 3700---
MOTOR EFW 3600-
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....... TU FIBI N E EFW 3500---
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STARTU P EFW N
3400---
I5 A q N,-
S G PIPE HEAD
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a 3300---
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3200---
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N 3000---
29OO---.....................:.......+~""""'..........-
2800 200 300 400 500 600 700 250 350 450 550 650 FLOW RATE, GPM
Mr. Robert J. Harrison We request either that such tests be conducted or that detail calculations be provided which establish the behavior under conditions similar to those for the EFW pumps under design basis assumptions. Please indicate your plans in this area.
Victor Nerses, Project Manager PWR Project Directorate No. 5 Division of PWR licensing-A
Enclosure:
As stated cc:.See next page
' Distribution:
Docket Files NRC PDR local PDR PD#5 Reading File OGC-Bethesda TNovak JPartlow BGrimes EJordan VNerses ACRS (10)
MRushbrook-CBerlinger Wlyon OFC :PD#5 NAME : W E ;js
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DATE:8//f/86 OFFICIAL RECORD COPY