ML19263D155

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During Flushing of Piping Sys,Facility Control Tank Was Inadvertently Overpressurized.Forwards Program to Be Followed If Insp Reveals Vessel Integrity Indications Unacceptable to ASME Code
ML19263D155
Person / Time
Site: Diablo Canyon Pacific Gas & Electric icon.png
Issue date: 02/09/1979
From: Crane P
PACIFIC GAS & ELECTRIC CO.
To: Carosella P, Engelken R, Sharp R
CALIFORNIA, STATE OF, NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V)
References
NUDOCS 7903220039
Download: ML19263D155 (2)


Text

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NRC PUBI,IC DOCUMENT ROQM PACIFIC GAS AND .E LE C T RI C C O M PANY IPG"G l 77 BE ALE STREET. 31ST FLOOR .

S AN FR ANCISCO. C ALIFORNI A 94106 (415) 781 4211

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Mr. P. J. Carosella, Premier Engineer State of California Chief Boiler Inspector Pressure Vessel Division 1390 Market Street, Room 71')

San Francisco, CA 94102 g 9

Mr. R. D. Sharp, Chief Inspector T[d Hartford Steam Boiler Insurance Cmpany { Na3 y $

350 Sansome Street 1 -s-16 San Francisco, CA 94104

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Mr. R. H. Engelken, Director epp ~

g j Office of Inspection and Enforcement Region V ^

  • U.S. Nuclear Regulatory Ccmnission Palnut Creek Plaza, Suite 202 1990 North California Boulevard Walnut Creek, CA 94596 Re: Docket No. 50-323-OL Diablo Canyon Unit 2 Gentlemen:

During flushing of a piping system, the Diablo Canyon Unit 2 volume control tank was inadvertently overpressurized. The Unit 2 volume control tank was designed and fabricated in accordance with the requirenents of the A9E Boiler and Pressure Vessel Code Section III, Class "C" - 1968 Edition. The volume control tank is ASME code symbol stamped "U" and "N", Division 1, dated 1970. It was manu -

factured by Joseph Oat & Sons, Inc., Philadelphia, Pennsylvania, Serial No. 1787-2D, National Board No. 384. The tank is now subject to ASME Code Section XI jurisdiction.

Prior to plant operation, PGandE propose 3 to certify the integrity of the vessel in accordance with the requirements of ASME Code Section XI,1975 Addendum.

AstE Section XI, Strmer 1975 Addendum, specified the requirenents for requalifying components for service through examination, evaluation, and repair. The PGandE 790322OON

Mr. P. J. Carosella Mr..R. D. Sharp' Mr. R. II. Engelken .

February 9, 1979 inspection program will consist of the following:

1. A visual exanination of the tank at 1.50 of design pressure (rchydrotest).
2. A liquid penetrant exanination from inside and outside of all structural discontinuities (weld nozzles, weld attach m nts, girth band, etc.) performed in accordance with AStE Code Section XI Rules.

If indications unacceptable to ASME Code Section are revealed, the following program will be followed for conducting repairs:

1. The indication will be remved by mechanical renoval of nuterial in increuents cf 30 mils depth. The repair area will be liquid penetrant exanined after each increamt to determine if the indication has been cmpletely removed.
2. khen the indication has been ccr.pletely remved, the repair area will be prepared for welding in accordance with lWB 4200 of the ASME Boiler and Pressure Vessel Code,Section XI, Sw mer 1978 Addendum.
3. Tne weld repair will be accomplished with austenitic stain-less steel filler metal using procedures and welders qualified in accordance with ASME Section IX.
4. The crvleted weld repair area will be exanined by the liquid penetrant method to establish a new pre-service record.
5. The services of an authorized inspector will be used for the repair.

If no indications are found or if indicatiens are found and are repaired in accordance with the aforemntioned program, the tank will be deemed qualified for service in accordance with the ASME Section XI code, Summer 1975 Addendum. This program is subnitted for your information and review as required by the Code.

f truly yours

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P A r a, or.

cc: Service List