ML20043H209

Forwards List of Corrective Actions & Current Status in Response to NRC Bulletin 88-004, Potential Safety-Related Pump Loss

ML20043H209
Person / Time
Site:	North Anna
Issue date:	06/13/1990
From:	Stewart W VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
90-328, IEB-88-004, IEB-88-4, NUDOCS 9006220216
Download: ML20043H209 (4)

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YIRGlhlA E u:CTRIC AND PowrR COMPANY RICHMOND, VIRGINIA 23261 June 13,1990 United States Nuclear Regulatory Commission Serial No.

90 328 Attention: Document Control Desk NL&P/JYR Washington, D.C. 20555 Docket Nos.

50 338 50 339 License Nos. NPF-4 NPF 7 Gentlemen:

VIRGINIA ELECTRIC AND POWER COMPANY NORTH ANNA POWER STATION UNITS 1 AND 2 STATUS OF NRC BULLETIN 88 04:

POTENTIAL SAFETY-RELATED PUMP LOSS NRC Bulletin 88-04: " Potential Safety Related Pump Loss" identified concerns wi'h minimum flow designs and requested licensees to investigate these concerns and correct them where applicable. In our letter dated August 8,1988, we provided a list of corrective actions necessary to satisify these concerns. In response to a recent request from the NRC North Anna Project Manager, enclosed is a list of these corrective actions and their current status.

Should you have any questions, please contact us.

Very truly yours, h3A t

h L. Stewart snior Vice President Nuclear Attachment cc:

United States Nuclear Regulatory Commission Region 11 101 Marietta Street, N.W.

Suite 2900 Atlanta, GA 30323 Mr. M. S. Lesser NRC Senior Resident inspector North Anna Power Station gg62gggggggg3g f,(g a

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Status of NRC Bulletin 88 04 e

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NORTH ANNA RESPONSE TO NRCB 88-04 CORRECTIVE ACTIONS and CURRENT STATUS A.

Residual Heat Removal (RHR) 1.

Short term Appropriate procedures will be reviewed and revised, as necessary, by September 15, 1988 to mlnlmize operation in the recirculation mode.

Approved procedure deviations are currently in place to address this concern.

Appropriate procedures were reviewed and revised by September 8,1988.

2.

Lona term Technical Specification Change (Serial Number 90183) was submitted, in part to reduce pump testing on mini flow conditions.

B.

Low Head Safety inlaction (LHSI) 1.

Short term Applicable Emergency Operating Procedures (EOPs) will be reviewed by November 1,1988 to determine the need and feasibility of revising the procedures to reduce operation on minimum flow recirculation.

Applicable EOP's were reviewed by November 1,1988, No revised procedures were required.

2. Lona Term a.

If our EOP review Indicates that a procedure revision is necessary, we will provide these changes to Westinghouse for a generic review.

Not Applicable b.

An evaluation by the pump vendor has been requested to determine the adequacy of the recirculation system. We will consider this information in deciding if future modifications are required.

The pump vendor (Ingersoll Rand) completed an evaluation of the recirculation system on December 12,1988. As a result, appropriate procedures were revised.

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Auxillarv Feed Water (AFW) 1.

Shoit Term l

a. Appropriate procedures will be reviewed and revised, as L

necessary, by September 15, 1988 to minimize operation at low flow / minimum flow recirculation.

Appropriate procedures were reviewed and revised by September 8,1988.

b. Appropriate post maintenance test procedures will be revised by February 1,1989 (prior to the next refueling outage) to limit the J

use of these pumps for leak testing the steam generators.

Appropriate procedures were reviewed and revised by September 8,1988.

2.

Long Term

a. One or more auxillary feedwater pumps will be disassembled and Inspected for degradation during each refueling outage for each unit so that all three pumps are inspected at least once every 3 years, if any inspection results Indicate pump degradation, all of the affected unit's pumps will be Inspected during the same outage.

Appropriate procedures were revised to require all AFW pumps to be inspected at least once every 3 years. Some pump degradation was found during the initialinspection which resulted in the inspection of all of Auxiliary Feedwater pumps. However, based on a special test performed prior to, and after the inspection and repair, no degradation in performance had occurred.

b. Based on the results of the pump inspections and recommendations of the manufacturer, modifications to the minimum flow recirculation lines or an augmented pump Inspection program will be considered.

An inspection program was developed to require the appropriate pump Inspections (Item 2a. above).

Modifications to minimum flow recirculation lines is scheduled for implementation during the 1990/91 refueling outages. A full flow recirculation line will be added for pump testing and extended run during low flow conditions.

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