ML20210N463
| ML20210N463 | |
| Person / Time | |
|---|---|
| Site: | Seabrook  |
| Issue date: | 04/29/1986 |
| From: | Devincentis J PUBLIC SERVICE CO. OF NEW HAMPSHIRE |
| To: | Noonan V Office of Nuclear Reactor Regulation |
| References | |
| SBN-1022, NUDOCS 8605050101 | |
| Download: ML20210N463 (6) | |
Text
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SEABROOK STATION e j (M l
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Engineering Office P~
Put2c Service of New HampeNro N w Hampshire Yankee Division April 29, 1986 SBN-1022 T.F. B7.1.1 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 (b) PSNH Letter (SBN-899), J. DeVincentis to G. W. Knighton, "Seabrook Station Voltage Regulation Study", dated November 21, 1985
Subject:
Seabrook Station Voltage Pegulatory Study
Dear Sir:
During the review of the Reference (b), the Staff requested that we provide additional information on the effects of momentary low voltage to the operation of the level indicator converters addressed in Item (4) of Reference (b).
Enclosure I provides the requested information which supplements that already transmitted to the Staff via Reference (b).
We trust this information will satisfactorily resolve the Staff's questions pertaining to the level indicator converters.
Ve y tru y y urs, jY ohn DeVincentis, Director Engineering and Licensing Enclosure cc: Atomic Safety and Licensing Board Service List j
8605050101 860429 PDR ADOCK 05000443 4000mskMtesessamenonormsw$mocyggxwym,xmm
Diane Curran, Esquire Calvin A. Canney Harmon & Weiss City Manager 2001 S. Street, N.W.
City Hall Suite 430 126 Daniel Street Washington, D.C.
20009 Portsmouth, NH 03801 Sherwin E. Turk, Esq.
Stephen E. Merrill, Esquire I
office of the Executive Legal Director Attorney General U.S. Nuclear Regulatory Commission George Dana Bisbee, Esquire Tenth Floor Assistant Attorney General Washington, DC 20555 Office of the Attorney General 25 Capitol Street Robert A. Backus, Esquire Concord, NH 03301-6397 116 Lowell Street P.O. Box 516 Mr. J. P. Nadeau Manchester, NH 03105 Selectmen's Office 10 Central Road Philip Ahrens. Esquire Rye, NH 03870 Assistant Attorney General Department of The Attorney General Mr. Angie Machicos Statehouse Station #6 Chairman of the Board of Selectmen Augusta, NE 04333 Town of Newbury Newbury, MA 01950 Mrs. Sandra Gavutis Chairman, Board of Selectmen Mr. William S. Lord RFD 1 - Box 1154 Board of Selectmen Kennsington, NH 03827 Town Hall - Friend Street Amesbury, MA 01913 Carol S. Sneider, Esquire l
Assistant Attorney General Senator Gordon J. Humphrey Department of the Attorney General 1 Pillsbury Street one Ashburton Place, 19th Floor Concord, NH 03301 Boston, MA 02108 (ATTN: Herb Boynton)
Senator Gordon J. Humphrey H. Joseph Flynn Esquire U.S. Senate Office of General Counsel Washington, DC 20510 Federal Emergency Management Agency l
(ATTN: Tom Burack) 500 C Street, SW Washington, DC 20472 l
Richard A. Hampe Esq.
l Hampe and McNicholas Paul McEachern, Esquire 35 Pleasant Street Matthew T. Brock, Esquire Concord, NH 03301 Shaines & McEachern 25 Maplewood Avenue Donald E. Chick P.O. Box 360 Town Manager Portsmouth, NH 03801 f
Town of Exeter 10 Front Street Gary W. Holmes, Esq.
Exeter, NH 03833 Holmes & Ells 47 Winnacunnet Road Brentwood Board of Selectmen Hampton, NH 03841 RFD Dalton Road Brentwood, NH 03833 Mr. Ed Thomas FEMA Region I Peter J. Mathews, Mayor 442 John W. McCormack PO & Courthouse City Hall Boston, MA 02109 Newburyport, MA 01950 Stanley W. Knowles, Chairman Board of Selectmen P.O. Box 710 North Hampton, NH 03862
SBN-1022 ENCLOSURE I Seabrook Station Voltage Regulation Study (Additional Information on Level Indicator Converters)
o The Seabrook Voltage Regulation Study indicates, under Section V.B.2.3, that under the worst condition (i.e., maximum plant load and minimum grid voltage),
the voltage at the 120 volt distribution panel buses may drop momentarily to 94.1 volta due to motor starting.
The effect of this momentary voltage dip to the operation of the level indicator converters (GEMS RE-36562) has been analyzed and discussed with the manufacturer of the equipment.
As indicated in the enclosed correspondence between the manufacturer of subject equipment and United Engineers and Constructors, a voltage dip as low as 90 volta could cause approximately two percent error in the output of the converter.
These level indicators converters are used for post-accident monitoring of containment water level after an accident (LOCA). There is no actuation function associate with these level indicators.
Based on the above, we see no safety significance to this voltage variation considering the function of these devices, the momentary duration of the voltage dip, and the effect that this dip could have on the performance of the subject devices.
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a( ', s Dalaval FACSIMILE NO.: 203-747-4244 (DEX 3600: Burroughs)
Oiiu'7 DATE:
11 A 3ril 1086 T0:
stan Melchanow United Enoineers &
FROM:
William C. Meyer Constructors. Inc.
Philadelphia. PA 19101
SUBJECT:
Job _f9763-102 Seabro_ak Station - Public Service Co.,o_f New Hampshire Recardina your Dex of 8 Aoril 1986 voltace dron ouestion concernino our receiver assembiv_- RF-36_567/112098 UE &_C Tag #_CBS-Lit-2384/2385 - at 90 VAC there could be approximately 2% error in 4-20 MA output.
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TRANSMERICA DELAVAL GEMS SENSOR DIVISION PIAINVILLE, CT. 06062 ATTENTION:
Mr. Bill Mayer Telecopy #203-747-4244 FROM:
S. M. MOLCHANOW 30 SOUTH 17tM STREET PHILADELPHIA, PA 19101 Telephones (215) 422-4581
SUBJECT:
PUBLIC SERVICE COMPAPY OF NEW MAMI SHIRE ET AL.
NEW RAMPSHIRE YANREE :)IVISION SEABROOK STATION P. O. 9763.006-174-15 CLASS 1E LEVEL TRANSMLTTERS TO SATISPY NRC AUDIT, PLEASE PROVIDE THE EPP1 CT OF MOMENTARY ($ SECOND -
DURING MOTOR STARTING) VOLTAGE DROP TO 90 VOLTS ON GEMS LIVEL INDICATOR 4-20MA CONVERTERS.
UE&C TAG NO.
)CDEL NO.
CBS-LIT-2384 RE-36562 Type P/N 112098 CBS-LIT-2385 RE-36562 Type P/N 112098 WE WOULD APPRECIATE RECEIVING TOUR RESPONSE SY APRIL 8, 1986.
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