ML20102A258

Interim Deficiency Rept Re Crosby Main Steam Safety Valve Ring Settings.Initially Reported on 841221.Results of Tests Will Be Reported by 850331

ML20102A258
Person / Time
Site:	Seabrook
Issue date:	01/17/1985
From:	Devincentis J PUBLIC SERVICE CO. OF NEW HAMPSHIRE
To:	Starostecki R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
References
SBN-751, NUDOCS 8502080237
Download: ML20102A258 (4)

Text

.o.

2 SEABROOK STATION Engineering Office PubEc Service of New HampsNro New Hompshire Yonkee Divh January 17, 1985 SBN- 751 T.F. Q2.2.2 United States Nuclear Regulatory Commission Region 1 631 Park Avenue King of Prussia, PA 19406 Attention: Mr. Richard W. Starostecki, Director Division of Project and Resident Programs

References:

(a) Construction Permits CPPR-135 and CPPR-136, Docket Nos. 50-443 and 50-444 (b) Telecon of December 21, 1984, A. L. Legendre, Jr. (YAEC) to J. Grant (Region I)

Subject:

Interim 10CFR50.55(e) Report, " Main Steam Safety Valve Ring Setting Deficiency"

Dear Sir:

We previously reported [ Reference (b)] a potential 10CFR50.55(e) item to Region I regarding the apparent deficiency in Crosby Main Steam Safety Valve ring settings. The deficiency was discovered at Wyle Labs during full flow testing of the Crosby valves to determine the proper vent stack size. In order to determine full flow, the valve disc travel was measured and a disc travel of 1.12 inches was confirmed to us as being required by Crosby Valve Company via telecon on December 3, 1984 The tests determined that the disc only traveled approximately 50% of the required distance with 3% accumulation.

The same limited disc travel occurred on later tests with larger diameter vent stacks. After discussions with Crosby, the ring setting was adjusted. The valve was retested and the required disc travel was achieved.

The problem and its reportability occurs because uncorrected reduced valve disc travel may invalidate certain assumptions on the Main Steam System in the FSAR Accident Analysis. The Seabrook FSAR Accident Analysis performed by Westinghouse Corporation assumes that the Main Steam Safety Valves are fully open with 3% accumulation. The ring settings are adjusted at Crosby Valve Company and the valve disc travel is not normally measured to confirm the required lift in field test.

8502080237 050117 PDR ADOCK 05000443 g PDR P.O. Box 300 . Seatxook.NH 03874 Telephone (603)474-9521 b_ 8O

F; '

4-taq  : -:

,r '*

s United States Nuclear Regulatory Commission Attention: .Mr. Richard Starostecki, Director Page 2 In conclusion, we are performing additional testing on the Crosby Main Steam Safety Valve to verify the ring setting problem without any stack in-fluence' whatsoever, and to determine the new ring settings. The results of these tests will be reported in a future interim 10CFR50.55(e) report by March 31, 1985.

Very truly yours,

) .d

• J. DeVincentis, Director Engineering and Licensing cc: LAtomic. Safety and Licensing Board Service List Director,~ Office of Inspection and Enforcement U.~ S.; Nuclear Regulatory Commission

? Washington, DC 20555 4

N

'O s

[

- ~ ,'

,-m_a ,,

r

'I s - .

'o 2 William S. Jordan, III

"- Diana Curran .

Harmon, Weiss & Jordan 20001 S Street N.W. Erentwood Board of Selectmen Suite'430 RED Dalton Road Washington, D.C. 20009 Brentwood, New Hampshire 03833

, Robert G.' Perlis ,

Office of the Executive Legal Director Edward F. Meany U.S. Nuclear Regulatory Commission Designated Representative of Washington, DC 20555 the Town of Rye 155 Washington Road Robert A. Backus, Esquire Rye, NH 03870 116 Lowell Street P.O. Sox 516 Calvin A. Canney Mancehster, NH 03105 City Manager City Hall Philip Ahrens, Esquire 126 Daniel Street Assistant Attorney General Portsmouth, NH 03801 Department of the Attorney General Augusta..ME 04333 Dana Bisbee, Esquire Assistant Attorney General Mr. John B. Tanzer Office of the Attorney General Designated Representative of

~

208 State House Annex the Town of Hampton Concord, NH 03301 5 Morningside Drive Hampton, NH 03842 Anne Verge, Chairperson Board of Selectmen Roberta C. Pevear- Town Hall Designated Representative of- South Hampton, NH 03642 the Town of Hampton Falls Drinkwater Road Patrick J. McKeon Hampton Falls, NH 03844 Selectmen's Office 10 Central Road Mrs. Sandra Cavutis. Rye, NH 03670 Designated Representative of the Town of Kensington Carole F. Kagan, Esq.

RFD 1 East Kingston, NH 03827- Atomic Safety and Licensing Board Panel U.S. Nuclear Regulatory Commission Jo Ann Shotwell, Esquire Assistant Attorney General Mr. Angie h6chiros Environmental Protection Bureau Chairman of the Board of Selectmen.

Department of the Attorney General Town of Newbury One Ashburton Place, 19th Floor Newbury, MA 01950 Boston, MA 02108 Town Manager's Office Senator Cordon J. Humphrey Town Hall - Friend Street U.S. Senate Amesbury, Ma. 01913 Washington, DC 20510 (Attn: Tom Burack) Senator Gordon J. Humphrey 1 Pillsbury Street Diana P. Randall Concord, NH 03301

. 70 Collins Street (Attn: Herb Boynton)

SEmbrook, NH 03874 Richard E. Sullivan, Mayor Donald E. Chick City Hall Town Manager Newburyport, MA 01950 Town of Exeter 10 Front Street, Eveter, NH 03833 L

g. _

.n w-NRC FORMS FACCIMILE HANDB2CK NRC FORM 120

.l

.rs *

)-

(V-i k

ACCESSION NUMBER BOX NUMBER OF FICE/ DIVISION /8R ANCH

, DESCRIPTION OF CONTENTS

};

LOCATION NUMBER eg x) .

""C,f

,, *'* '88 RECORD RETIREMENT IDENTIFIER UA Nucts Am RaouLafony commeressom

. FOAMS MANAGEMENT DATA '

1/83 CONSTRUCTNW OF #0RM 8^ '"

PtCE PRESCRiteNG DIRECTIVE STOCM NUMBER T F E 4,T

~ SHEET

~

CARD ADM:TIDC:DM PD/ (Ped / tat per Pad) Label 7-81 USf STATUS OF EMI671000 STOCK

',., _ (Unit arts / Number of Parts)

. .: /*N\ MP/ J USE flRST OTHER fWitW/Nunter of Ports! (SPfC/FY/

'/ { LASEL, 8 x 5%" ~ DESTROY:

'( ~ PC (Poetal Card)

~

IMMEolATELY Nv TC (Tab Card)

WHEN NEW STOCK

~ IS AVAILASLE

~_ TP/ (Tab Paper / Number of Parts)

STOCNesse POesti

~

ENVL OTHE R ($per/&i WAREHOUSE U SUPPLY MOOMS T PROMULGATiNO OrriCE rONt vi