BSEP-85-1850, Part 21 & Deficiency Rept Re 12 of 16 Rockwell Edward Valves Exceeding Leak Rate Criteria as Specified by Procurement Documentation.Initially Reported on 850705. Valves Returned to Vendor for Cause Determination

Part 21 & Deficiency Rept Re 12 of 16 Rockwell Edward Valves Exceeding Leak Rate Criteria as Specified by Procurement Documentation.Initially Reported on 850705. Valves Returned to Vendor for Cause Determination

ML20209H853
Person / Time
Site:	Brunswick
Issue date:	10/18/1985
From:	Dietz C CAROLINA POWER & LIGHT CO.
To:	Grace J NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
References
REF-PT21-85, REF-PT21-85-444-000 BSEP-85-1850, PT21-85-444, PT21-85-444-000, NUDOCS 8511110243
Download: ML20209H853 (2)

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Cp&L Carolina Power & Light Company Brunswick Steam Electric Plant P. O. Box 10429 Southport, NC 28461-0429 m October 18, 1985 cm ca n

-4 FILE: B09-13520 ,

, y SERIAL: BSEP/85-1850 22 Dr. J. Nelson Grace,. Administrator em U.S. Nuclear Regulatory Commission i Suite 2900 CA 101 Marietta Street hV W Atlanta, GA 430323 BRUNSWICK STEAM ELECTRIC PLANT UNIT 1 DOCKET NO. 50-325 '

LICENSE NO. DPR-71 NOTIFICATION OF A 10CFR21 REPORTABLE EVENT

Dear Dr. Grace:

This submittal confirms the telephone conversation at 1400 on October 14, 1985, between Mr. L. Mellon, of your staff, and Mr. R. M. Poulk, Jr.. concerning a 10CFR21 reportable event.

While performing Plant Modification '(PM)84-297, Automatic Depressurization System (ADS) and Main Steam Isolation Valve (MSIV) accumulator check valve replacement, for Unit 1, bench testing at the Brunswick site indicated that 12 of 16 valves tested exceeded the leak rate criteria as specified by the procurement documentation. This was determined on approximately July 5, 1985. The following information is provided to address the requirements of 10CFR21:

1. The valves purchased to install under PMs84-297, 84-195, and 84-303 were Rockwell Edward forged-steel bolted bonnet and univalve check valves.

These valves were supplied with vespel seat washers on the valve disk.

The valves sizes, Rockwell figure numbers, and number ordered per unit are: , ,

Valve Size Rockwell Figure No. Ordered 3/4" 838JYT4 35 1" 838JYT4 16 2" 838JYT4 2 3/4" B36274JT4 2 i 8511110243 851018 PDR ADOCK 05000325 S PM ZE/9

r g 'Q CD&L Carolina Power & Light Company Brunswick Steam Electric Plant P. O. Box 10429 Southport, NC 28461-0429 m October 18, 1985 t, 1 21

-1 FILE: B09-13520 ro SERIAL: BSEP/85-1850 2:n Dr. J. Nelson Grace, Administrator c:)

U.S. Nuclear Regulatory Commission Suite 2000 cn 101 Marietta Street hV Cn Atlanta, GA 30323 BRUNSWICK STEAM ELECTRIC PLAhT UNIT 1 DOCKET NO. 50-325 LICENSE NO. DPR-71 NOTIFICATION OF A 10CFR21 REPORTABLE EVENT

Dear Dr. Grace:

This submittal confirms the telephone conversation at 1400 on October 14, 1985, between Mr. L. Mellon, of your staff, and Mr. R. M. Poulk, Jr., concerning a 10CFR21 reportable event.

While performing Plant Modification (PM)84-297, Automatic Depressurization System (ADS) and Main Steam Isolation Valve (MSIV) accumulator check valve replacement, for Unit 1, bench testing at the Brunswick site indicated that 12 of 16 valves tested exceeded the leak rate criteria as specified by the procurement documentation. This was determined on approximately July 5, 1985. The following information is provided to address the requiranents of 10CFR21:

1. The valves purchased to install under PMs84-297, 84-195, and 84-303 were Rockwell Edward forged-steel bolted bonnet and univalve check valves.

These valves were supplied with vespel seat washers on the valve disk.

The valves sizes, Rockwell figure numbers, and number ordered per unit are:

l Valve Size Rockwell Figure No. Ordered 3/4" 838JYT4 35 1" 838JYT4 16 2" 838JYT4 2 3/4" B36274JT4 2 8511110243 851018 PDR ADOCK 05000325 S PDR ZE/9

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Dr. J. Nelson Grace 2. Upon the realization that a high leakage rate did exist with the valves I (some ten-times specifications), the vendor was notified of the bench test results and the valves were returned to him for cause determination and correction. It was determined that the method of swaging the vespel seat washer to the disk allowed leakage to occur under the seat washer. The disk were reswaged, retested, and found acceptable prior to installation in the plant. Valves to be installed in Unit 2 and to be used for spares have also been corrected.

3. These valves were received from:

Rockwell International Flow Control Division P. O. Box 501 Sulphur Springs, TX 75482

4. The ADS valves and the MSIVs are air-operated valves which are supplied by air from two separate divisions. In addition, an accumulator is provided on each valve to assure an air supply is available should all station air be lost. The check valves in question are located on the air headers for each division to each valve and on the nitrogen backup system to these air headers. Their purpose is to prevent the loss on one division from bleeding down the other division and/or the accumulators, thus making the ADS and MSIV System inoperable. These check valves were also installed on the air system to containment isolation valves CAC-VS, 6, 7, 8, 9, 10, and 15. These valves were added to the system along with accumulators to ensure air would be available for closure on a loss of station air.

Should a failure of an air header occur with the excessive leakage check valves installed, the ADS function and manual operation of the safety relief valves (SRVs) could have been made inoperable. The safety relief function of these valves would still perform as designed, as air is not required for this function. A loss of air to the MSIVs would have caused them to shut, as air pressure is used to keep them open. Spring pressure is used to close these valves. This loss of the ADS and the closure of the MSIVs could have affected the ability of the plant to achieve and

' maintain a safe cold shutdown condition.

Very truly yours,

-hl  ?

C. R. Diatz, Genehal Manager Brunswick Steam Electric Plant RMP/mcg cc: NRC Document Control Desk Director - Office of Inspection and Enforcement (3)

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