ML19241B660

Submits Rept of Deficiency in Safety Injection Sys Piping. Supports Do Not Meet Seismic Stress Criteria.Caused by Improper Input Criteria Used for Bldg Displacement

ML19241B660
Person / Time
Site:	North Anna
Issue date:	04/27/1979
From:	Stallings C VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:	James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
References
REF-PT21-79-121-000 NUDOCS 7907190816
Download: ML19241B660 (2)

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l Q $~O 0 0 VIltGINIA EI ucntIC ANu Poweit C O >t m N Y R Ic11M oN n,V11a'21N s A n a n 61 April 27, 1979 Mr. James P. O'Reilly, Director Serial No. 306 Office of Inspection and Enforcement P0/FHT:;cj U. S. Nuclear Regulatory Co= mission Docket No. 50-338 Region 11 101 Marietta Street, Suite 3100 Atlanta, Georgia 30303 License No. NPF-4

Dear Mr. O'Reilly:

Under the provisions of the operating license Technical Specifications and/or 10CFR21, NRC Region II was notified on April 20, 1979 that a potential significant deficiency or substantial safety hazard existed at North Anna Power Station, Unit No. 1.

In accordance with the reporting requirements of the above regulations, the following information is submitted:

A. Name and address of reporting individual:

C. M. Stallings Virginia Electric and Power Company P. O. Box 26666 Richmond, Virginia 23261 B. Facility, activity, and/or component affected: Safety Injection System, North Anna Power Station, Unit No. 1.

C. Name of firm supplying the component, activity or service:

Stone & Webster, Boston, Massachusetts D. Description of defect, deficiency, or failure to comply:

Following a review by Stone & Webster of the North Anna Unit 2 Main Steam Valve House piping Stress Analysis, it was determined that improper input criteria were used for the building dis placement on Unit 1. North Anna Power Station personnel were immediately informed of this situation and the affected piping.

Four supports on the Safety Injection System piping were involved:

two supports were on the Train A Suction header of the high head safety injection pumps and two supports were on the high head safety injection supply header from the RWST. These supports do not meet the stress requirements posed by a seismic event and require modification.

E. Date of determination of reportability: April 24, 1979.

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9 h.n u E ucnw .on Pew t n Comam Mr. James P. O'Reilly 2 F. S tailar components , activities, or services:

Presently, no other supports have been found to pose a similar problem however this review is continuing.

G. Corrective action which has been, is being, or will ba taken, the individual respoasible and the length of time to cocplete the action:

The correct criteria on Main Steam Valve House displace =ent were used and modification of the affected supports has been initiated.

H. Other in fo rma t ion :

(1) Any additional information rega a ng the above topics will be submitted as a Licensee Event Reptst Should you require further information, please ccatact this office.

Very truly yours, (Lt (L;cc_.n.,i C. M. Stallings Vice President-Power Supply and Production Operations cc' Mr. John G. Davis, Acting Director (3) 40'/ 015

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April 27,1979 Mr. Jr:nes P. O'Reilly, Director Serial No. 306 Office of Inspectiot. and Enforcement PO/FHT:sej U. S. Nuclear Regulatory Commission Docket No. 50-338 Region II ,.

101 Marietta Street, Suite 3100 Atlanta, Georgia 30303 License No. NPF-4 .

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Dear Mr. O'Reilly:

>[ .'O Under the provisions of the operating license Technical Specifications orn and/or 10CFK21, NRC Region II.vas notified on April 20, 1979 that a potentiFIS O

significant deficiency or substantial safety hazard exi.oted at North Anna Power Station, Unit No. 1. 9,'

.5 In accordance with the reporting requirerants of the above regulations, the following inforr.stion is submitted:

A. Name and address of repor:;inr, individual:

. C. M. Stallings Virginia E.lectric and Power Company P. O. Box 26666 Rictmond, Virginin 13261 B. Facility, activity, and/or cou:ponent af fected: Safety Injection Syste:a, Forth Anns Pouer Station, Unit No. 1.

< C. Ha=e of firm cupplying the component, activity or service:

Stone & Webster, Boston, Massachusetts D. Descriptiot oi defect, deficiency, or failure to co:cply:

Follouing a teview by Stone & Webster of the Forth Anna Unit 1 Main Stec= Valve House piping Strees taalysia, it was determined thr.t improper input criterin vere used for the building displacement on Unit 1. North Anns Pover Station personnel were icr:ediately inforced of this situation end the affected piping. ,. j Tour supports on the Sefety Injection System piping were involved:

two supports were on the Train A Suction bender of the high head safety injection pu=ps and two supporti.s were on the high head safety injection cupply header from the RWST. penesupportsdonotreetthestreca requirecento poced by a celente event and require radification.

E. Dtto of determination of reportability: April 24, 1979. ,

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viruim Euctmc am Powe= Co*"Y Mr. J ames P. O'Reilly 2 F. Si=ilar coeponents, activities, or services:

Presently, no other supports have been found to pose a similar problem however this review is continuing.

G. Corrective action which has been, is be:.ng, or vill be taken, the individual responsible and the length cf time to complete the action:

The ccrrect criteria on Main Steam Valve House displacement were used and modification of tbo affected supporte has been initimred.

B. Other information:

(1) Any additional information regarding the above topics will be subcitted as a Licensee Event Report.

Should you require furt$er information, please contact this office.

Very truly yours,

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Ig C. M. Stallings Vice President-Power Supply and Production Operations cc: Mr. John G. Davis, Acting Director (3)

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