ML18152B419

Advises That Structural Integrity Evaluation Provided 990330 Has Been Reviewed & Addl Info Requested.Staff Inquiries Encl in Form of RAI

ML18152B419
Person / Time
Site:	Surry, North Anna
Issue date:	05/25/1999
From:	Edison G, Kalyanam N NRC (Affiliation Not Assigned)
To:	Ohanlon J VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
References
GL-96-06, GL-96-6, TAC-M96838, TAC-M96839, TAC-M96873, TAC-M96874, NUDOCS 9905280026
Download: ML18152B419 (4)

Text

..

e May 25, 1999

• Mr. J. P. O'Hanlon Senior Vice President Virginia Electric and Power Company 5000 Dqminion Boulevard Glen Allen, VA 23060

SUBJECT:

GENERIC LETTER (GL) 96-06,"ASSURANCE OF EQUIPMENT OPERABILITY AND CONTAINMENT INTEGRITY DURING DESIGN-BASIS ACCIDENT CONDITIONS," REQUEST FOR ADDITIONAL INFORMATION (RAI), NORTH ANNA POWER STATION, UNITS 1 AND 2 (TAC NOS. M96838 AND M96839)

AND SURRY POWER STATION, UNITS 1 AND 2 (TAC NOS. M96873 AND M96874)

Dear Mr. J. O'Hanlon:

On September 30, 1996, the staff issued Generic Letter (GL) 96-06, "Assurance *of Equipment Operability and Containment Integrity during Design-Basis Accident Conditions," which included a request to evaluate cooling water systems that serve containment coolers to assure that they are not vulnerable to waterhammer and two-phase flow conditions under certain design-basis accident (OBA) conditions and thermally induced overpressurization of isolated water-filled piping sections in containment. On March 30, 1999, you provided the structural integrity evaluation of the thermally induced overpressurization of the containment penetration piping during a OBA. The staff has reviewed the evaluation in the letter dated March 30, 1999, and requires further information to complete its review of your responses. The enclosure to this letter forwards the staff's inquiries in the form of an RAI.

The staff requests a response to the RAI within 30 days of the submittal date. This submittal

_ date was discussed with Mr. Tom Shaub of your staff on May 18, 1°999, who indicated that Virginia Electric and Power Company will be able to meet this date. The staff appreciates the efforts expended with respect to this matter.

Sincerely, Original signed by:

Gordon E. Edison, Senior Project Manager Project Directorate 11, Section 1 Sincerely, Original signed by:

N. Kalyanam, Project Manager Project Directorate 11, Section 1 Division of Licensing Prc;,ject Management

(~ Office of Nuclear Reactor Regulation Division of Licensing Project Management Office of Nuclear Reactor Regulation 0 coo::

U":l(\\JQ Docket Nos.: 50-280, 50-281, 50-338 and 50-339

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e UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D.C. 20555-0001 May 25. 1999;

SUBJECT:

GENERIC LETTER (GL) 96-06,"ASSURANCE OF EQUIPMENT OPERABILITY AND CONTAINMENT INTEGRITY DURING DESIGN-BASIS ACCIDENT CONDITIONS," REQUEST FOR ADDITIONAL INFORMATION (RAI), NORTH ANNA POWER STATION, UNITS 1 AND 2 (TAC NOS. M96838 AND M96839)

AND SURRY POWER STATION, UNITS 1 AND 2 (TAC NOS. M96873 AND M96874)

Dear Mr. J. O'Hanlon:

On September 30, 1996, the staff issued Generic Letter (GL) 96-06, "Assurance of Equipment Operability and Containment Integrity during Design-Basis Accident Conditions," which included a request to evaluate cooling water systems that serve containment coolers to assure that they are not vulnerable to waterhammer and two-phase flow conditions under certain design-basis accident (DBA) conditions and thermally induced overpressurization of isolated water-filled piping sections in containment. On March 30, 1999, you provided the structural integrity evaluation of the thermally induced overpressurization of the containment penetration piping during a DBA. The staff has reviewed the evaluation in the letter dated March 30, 1999, and requires further information to complete its review of your responses. The enclosure to this

• letter forwards the staff's inquiries in the form of an RAI.

• The staff requests a response to the RAI within 30 days of the submittal date. This submittal date was discussed with Mr. *Tom Shaub of your staff on May 18, 1999, who indicated that Virginia Electric and Power Company will be able to meet this date. The staff appreciates the efforts expended with respect to this matter..

Sincerely, Gordon E. Edison, Senior Project Manager Project Directorate II, Section 1 Division of Licensing Project Management Office of Nuclear Reactor Regulation Docket Nos.: 50*-280, 50-281, 50-338 and 50-339

Enclosure:

Request for Additional Information cc w/encl: See next page Sincerely, N. Kalyanam, Project Manager Project Directorate 11, Section 1 Division of Licensing Project Management Office of Nuclear Reactor Regulation

e Virginia Electric & Power Company

.Mr. J __ Jeffrey Lunsford County Administrator, Louisa County P.O. B9x 160 Louisa, Virginia 23093 Donald P. Irwin, Esq.

Hunton and Williams Riverfront Plaza, East Tower 951 E. Byrd Street Richmond, Virginia 23219 Dr. W. T. Lough Virginia State Corporation Commission Division of Energy Regulation P.O. Box 1197 Richmond, Virginia 23209 Old Dominion Electric Cooperative 4201 Dominion Boulevard Glen Allen, Virginia 23060 J. H. McCarthy, Manager Nuclear Licensing and Operations Support Virginia Electric and Power Company Innsbrook Technical Center 5000 Dominion Boulevard Glen Allen, Virginia 23060 Office of the Attorney General Commonwealth of Virginia 900 East Main Street Richmond, Virginia 23219 Senior Resident Inspector North Anna Power Station U.S. Nuclear Regulatory Commission 1024 Haley Drive Mineral, Virginia 23117 Senior Resident Inspector Surry Power Station, US Nuclear Regulatory Commission 5850 Hog Island Road Surry, Virginia 23883 Robert B. Strobe, M.D., M.P.H.

State Health Commissioner Office of the Commissioner Virginia Department of Health P.O. Box 2448.

Richmond, Virginia 23218 W.R. Matthews Site Vice President North Anna Power Station Virginia Electric and Power Company P.O. Box 402 Mineral, Virginia 23117 J. P. O'Hanlon Senior Vice President - Nuclea'r Virginia Electric and Power Co.

Innsbrook Technical Center 5000 Dominion Boulevard Glen Allen, Virginia 23060 Mr. Eugene S. Grecheck Site Vice President Surry Power Station Virginia Electric and Power Company 5570 Hog Island Road Surry, Virginia 23883 Chairman Board of Supervisors of Surry County Surry County Courthouse Surry, Virginia 23683

SECOND REQUEST FOR ADDITIONAL INFORMATION SURRY POWER STATION AND NORTH ANNA POWER STATION RESPONSE TO GENERIC LETTER 96-06, "ASSURANCE OF EQUIPMENT OPERABILITY AND CONTAINMENT INTEGRITY DURING DESIGN-BASIS ACCIDENT CONDITIONS"

1.

• Load Combinations Note 2 states that seismic loading is not considered concurrent with a loss-of-coolant accident (LOCA). Provide the basis for not combining seismic and LOCA loads and also state how the requirements of General Design Criterion 2 of 10 CFR 50, Appendix A, which in part states "design bases shall reflect appropriate combinations of the effects of normal and accident conditions with the effects of the natural phenomena" are met.

2.

Stress Intensity Clarify if the allowables in note 3 are given for membrane stress intensity and the values listed in column 4 under "Applied Membrane Stress" are the stress intensities which are calculated considering pressure and all other applied loads. Provide details of the

• methodology including an example how the values in column 4 have been calculated.

3.

Appendix F Allowables The allowable stress criteria in note 3 are derived from article F-1311.1 (a) of Appendix F.

Discuss why the requirements of F-1311.1 (c) for the primary membrane plus primary bending have not been used in note 4.

The allowable stress criteria in note 4 are derived from article F-1430(b) of Appendix F.

Discuss why the requirement of F-1430(a) has not been evaluated.

From the above discussion, it appears that complete requirements of either of the articles, F-1331.1 or the alternate F-1430, have not been satisfied. Provide a justification for the "hybrid" criteria used in the evaluation.

ENCLOSURE 1.,