ML19320B672

Part 21 Rept Re Containment Electrical Penetrations Fault Current Protection Devices.Devices Would Not Limit Current to Values Below Thermal Limit.Devices Were Changed or Adjusted to Protect Penetrations

ML19320B672
Person / Time
Site:	North Anna
Issue date:	07/01/1980
From:	Wild P STONE & WEBSTER, INC.
To:
References
REF-PT21-80-239-000 NUDOCS 8007140585
Download: ML19320B672 (4)

Text

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WAsMihG70N To - 2 3 7-oo o Mr. Victor Stello, Director July 1, 1980 Office of Inspection and Enforcement U.S. Nuclear Regulatory Commission Washington, DC 20555

Dear Sir:

NOTIFICATION OF DEFECT, 10CFR21 NORTH ANNA UNIT 2 VIRGINIA ELECTRIC AND r0WER COMPANY Stone & Webster Engineering Corporation (S&W), pursuant to the provisions of 10CFR21, hereby provides notification of a " defect" concerning the Nor:A Anna Nuclear Power Station, Unit 2, owned by Virginia Electric and Power Company (VEPCO) and for which S&W provided both engineering and construction services.

In accordance with the reporting requirements of 7ection 21.21(b)(3),

the following information is submitted:

(i) Name and address of the individual informing the ' Commission:

Mr. P. A. Wild, Director of Engineering Stone & Webster En;;ineering Corporation P.O. Box 2325

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Boston, MA 02107 (ii) Identification of the facility, or the basic component supplied for such facility, which contains a defect:

North Anna Nuclear Power Station, Unit 2 Containment Electrical Penetraticas Fault Current Protection Devices (iii) Identification of firm constructing facility or supplying basic component which contains a defect:

Basic component supplied by Stone & Webster Engineering Corporation.

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VS 2 (iv) Nature of the defect and the safety hazard which could be created by such defect:

Review of the containment electrical penetration overcur-rent protection design indicated that General Design Criterion 50, as set forth in Appendix A to 10CFR50, may not have been fully met.

Analyses indicated that the design of the devices which protect the electrical circuits passing through the containment electrical penetrations would not limit the current in individual circuits to values below the thermal limit of the penetrations for all available values of currents. A test conducted by the penetration manufacturer indicated that exceeding the penetration thermal limit for extended periods could result in a degradation of the seals and hence diminish the ability of the penetration to seal against design basis event pressures. This would represent a major reduction in the protection provided to the public health and safety and could create a substantial safety hazard.

(v) Date on which information of such defect was obtained:

July 1, 1980 (vi) In the case of a basic component which contains a defect, the number and location of all such components in use at, supplied for, or being supplied for facilities subject to the regulations:

North Anna Unit 2 - 113 power circuits and 5 control circuits North Anna Unit 1 - 113 power circuits and 5 control circuits (vii) Corrective action which has been taken; name of individual or organization responsible; and length of time taken to complete the action:

Corrective action was taken by Virginia Electric Power Company and Stone & Webster Engineering Corpora-tion and completed by March 13, 1980.

Penetration limit curves were compared to the protec-tion device curves, and the protection devices were changed or adjusted so that the penetrations are protected.

VS 3 (viii) Advice related to the defect that has been given to purchasers or licensees:

No other actions, apart from the specified modifica-tions as detailed in the corrective action, were necessary to protect the penetrations.

Identification of this defect and the filing of this report are results.

of review of 10CFR50.55(e) reports and Licensee Event Reports filed by S&W clients since January 6, 1978. This review, committed to in our letter to NRC of September 6, 1979, resulted from the NRC special inspec-tion of May 1-4, 1979. NRC has been previously advised of the problem with the containment electrical penetrations fault current protection devices by the following notifications and reports made by VEPCO:

1. Twenty-four hour Reportable Event Follow-up Report received by NRC on August 27, 1979, for North Anna Unit 1.

2. Notification to NRC under 10CFR50.55(e) on August 28, 1979, for North Anna Unit 2.

3. 10CFR21 report contained in VEPCO letter Serial No. 717 dated August 31, 1979, on North Anna Unit 2, indicating similar components on North Anna Unit 1.

4. Licensee Event Report No. LER 79-104/01T-0 contained in VEPCO let.ter Serial No. 730 dated September 10, 1979, for North Anna Unit 1.

5. Written report under 10CFR50.55(e) contained in VEPCO letter Serial No. 717A dated September 27, 1979, for North Anna Unit 2.

If you require any further information, please contact Mr. S. B. Jacobs at 617-973-5264.

Very truly yours, V&PaOf P. A. Wild Director of Engineering JBS:mra n,a