ML18153C541

Application for Amend to License DPR-37,changing Tech Specs to Extend one-time Insp Interval for Low Pressure Turbine Blade Insps from Once Every 5 Yrs to Coordinate W/Disk & Hub Insps in 1993 Refueling Outage

ML18153C541
Person / Time
Site:	Surry
Issue date:	02/15/1991
From:	Stewart W VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
Shared Package
ML18153C542	List: ML18153C541 ML18153C543
References
L-91-058, L-91-58, NUDOCS 9102200239
Download: ML18153C541 (3)

Text

VIRGINIA ELECTRIC AND POWER COMPANY RICHMOND, VIRGINIA 23261 February 15, 1991 United States Nuclear Regulatory Commission Serial No.91-058 Attention: Document Control Desk NO/ETS Washington, D. C. 20555 Docket No. 50-281 License No. DPR-37 Gentlemen:

VIRGINIA ELECTRIC AND POWER COMPANY SURRY POWER STATION UNIT 2 PROPOSED TECHNICAL SPECIFICATION CHANGE ONE-TIME INSPECTION INTERVAL EXTENSION FOR LOW PRESSURE TURBINE BLADE INSPECTIONS Pursuant to 10 CFR 50.90, the Virginia Electric and Power Company requests an amendment, in the form of a change to the Technical Specifications, for Surry Power Station Unit 2, Operating License DPR-37. The proposed one time Technical Specification change will extend the interval for the Unit 2 low pressure turbine blade inspections. The existing Technical Specification requirement is to inspect 100% of the blades every five years. The current inspection frequency for the turbine disks and hubs is based on turbine operating time and not calendar time. The current methodology includes steam quality, initial crack size, critical flaw size, and crack propagation rate as key parameters to develop the inspection frequency. Similar parameters are a consideration for the failure of a blade and can be linked to turbine operating time. By the 1993 refueling outage the Unit 2 turbine will have accumulated approximately 66 months of operating time, well within the inspection interval guidance provided by the turbine manufacturer. Therefore, coordinating the Low Pressure Turbine blade inspection with the disk and hub inspections in the 1993 refue_ling outage will not impact the safe operation of Unit 2.

The proposed change for Unit 2 is included in Attachment 1. In order to eliminate the unnecessary turbine blade inspections from the upcoming outage scope and coordinate both hub and blade inspections, we are requesting that the one-time Technical Specification change be approved prior to the end of the Unit 2 refueling outage.

It is our intention to modify the frequency of inspection for the Low Pressure Turbine blades in the future to match that of the turbine hubs and keyways inspection requirements. A permanent Technical Specification change will be submitted for both Units that allows use of the approved Westinghouse methodology as the basis of the low pressure turbine blade inspection frequency.

~-

(

This request has been reviewed and approved by the Station Nuclear Safety and Operating Committee and the Management Safety Review Committee. It has been determined that the proposed one-time change does not involve an unreviewed safety question as defined in 10 CFR 50.59 or a significant hazards consideration as defined in 10 CFR 50.92. The basis for our no significant hazards consideration determination is included in Attachment 2.

Attachments cc: U. S. Nuclear Regulatory Commission Region II 101 Marietta Street, N. W.

Suite 2900 Atlanta, Georgia 30323 Mr. W. E. Holland NRC Senior Resident Inspector Surry Power Station Commissioner Department of Health Room 400 109 Governor Street Richmond, Virginia 23219

COMMONWEALTH OF VIRGINIA )

)

COUN1Y OF HENRICO )

The foregoing document was acknowledged before me, in and for the County and Commonwealth aforesaid, today by E. W. Harrell, who is Vice President - Nuclear Operations, for W. L. Stewart, who is Senior Vice President - Nuclear, of Virginia Electric and Power Company. He is duly authorized to execute and file the foregoing document in behalf of that Company, and the statements in the document are true to the best of his knowledge and belief.

Acknowledged before me this _}S_ day of ~t,($11 , 19il_.

My Commission Expires: \ J]a/A 3/ -, 19 qt/_

0

~~-v~ Notary P~i~

- (SEAL)

L __