ML20235G797

Clarifies Response to 870824 RII-87-07-01-SL4 Notice of Violation.Corrective Actions:Procurement of 8-inch Schedule 160 Calibr Block Initiated

ML20235G797
Person / Time
Site:	Robinson
Issue date:	09/23/1987
From:	Morgan R CAROLINA POWER & LIGHT CO.
To:	NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM)
References
RNPD-87-4744, NUDOCS 8709300222
Download: ML20235G797 (4)

Text

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Form 244 Carolina Power & Light Company

. a ,w v..; n,w;. n +-amum Company Correspondence ROBINSON NUCLEAR PROJECT DEPARTMENT POST OFFICE BOX 790 HARTSVILLE, SOUTH CAROLINA 29550 SEP 2 31987 Robinson File No: 13510C Serial: RNPD/87-4744 (10 CPR 2.201)

United States Nuclear Regulatory Commission Attn: Document Control Desk Washington, D. C. 20555 H. B. ROBINSON STEAM ELECTRIC PLANT, UNIT NO. 2 DOCKET NO. 50-261

. LICENSE NO. DPR-23 AMENDED RESPONSE TO RII-87-07-01-SL4

Dear Sir:

This submittal is in response to your request of August 24, 1987. We appreciate this opportunity to clarify the original response to the Notice of Violation.

The eight NRC concerns are addressed by the enclosure. This information should be satisfactory in addressing the NRC comments and questions. If you have any questions, please contact Mr. J. M. Curley.

Very truly yours, Y

R. E. organ General Manager H. B. Robinson S. E. Plant DAS:1ko Enclosure cc: J. N. Grace H. E. P. Krug 8709300222 870923 gDR ADOCK 05000261 PDR \

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Enclosure to Serial: RNPD/87-4744 Page 1 of 3 H. B. ROBINSON STEAM ELECTRIC PLANT, UNIT NO. 2 DOCKET NO. 50-261 LICENSE NO. DPR-23 AMENDED RESPONSE TO RII-87-07-01-SL4

1. The response states that the footnote stating eight inch (8") Schedule 120 was to " Accommodate Possible Redesign of the piping by future Plant modification".

Question: How did "Possible Redesign" information get put on working inservice inspection isometric drawings?

Response

The NSSS supplier's piping specification recommends the 8" piping in question to be Schedule 120. However, the thicker Schedule 160 was used, as indicated on the piping spool piece drawings. The reference to accommodating "Possible Redesign" was noted only to indicate that future piping modifications must use at least Schedule 120 material to meet the design specification for the system. This footnote should have been corrected at the time the discrepancy between the design specification and the actual installation was discovered in August 1984. The affected ISI Isometric Sketch has been revised.

2. The response states that the footnote of the sketch was not the basis for block selection.

Questions: A. Who was responsible for selecting the calibration block for the examination?

B. What was the basis for the selection?

C. How was the information concerning what calibration block to use transmitted to the examiner?

Response

(2.A.) The CP&L on-shift ISI Coordinator was responsible for the block selection in this case as for all ultrasonic examinations.

(2.B.) The basis for the block selection was the plus or minus one quarter inch tolerance (+/-1/4") specified in ASME Code Case N-98.

The use of the block under this Code Case had been discussed and documented with the ANII in August 1984 and was considered to be applicable and allowed in this situation. This discussion formed the basis for continued use of the block.

(2.C.) The blocks were selected for use by the CP&L on-shift ISI Coordinator. Prior to each inspection outage, a listing of blocks for use on a given weld is prepared and given to the ISI Vendor Coordinator. This listing forms the basis for block selection as each weld is scheduled for inspection, a standard practice at H. B. Robinson.

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Enclosure to Serial: RNPD/87-4744 Page 2 of 3 l

I 3. The response states that the sketch was referred to only for other I

piping information.

Question: A. What other piping information from the sketch was I

used during the examination?

B. Based on the validity of the 8" Schedule 120 note, what has been done to verify the validity of other piping information on the sketches?

Response

(3.A.) The ISI isometric sketches were used to provide information on the piping configuration and location of examination areas, i.e., weld and support locations with respect to the piping run. No other information was used from these isometric sketches during the examination.

(3.B.) Prior to issuance of the Notice of Violation, the ISI isometric sketches that form the basis for the ISI Program were in the process of being verified for conversion to a computerized data management program. All pertinent information has been assembled and the sketches have been scheduled for revision prior to the next refueling outage.

One additional drawing discrepancy has been identified in reviews performed since the 87-07 inspection. This involved Sketch CPL-210.

The drawing indicated a shell diameter of 14 inches and a thickness of 0.250 inches for the seal water filter. The component is actually 16 inches in diameter with a measured shell thickness of 0.20 inches.

The exams performed have been reviewed and have been determined to be in compliance with applicable code requirements. Sketch CPL-210 has been revised.

4. The response lists corrective actions which have been taken and which will be taken. These corrective actions involve the subject drawings but do not address the validity of inspections conducted using the wrong calibration block.

Question: A. How many welds were inspected using the wrong calibration block?

B. When will nonconforming inspections be repected?

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Enclosure to Serial: -RNPD/87-4744 Page 3 of.3

Response

(4.A.) With the exception of five Schedule 160 welds inspected using the subject 8" Schedule 120 calibration block, all ultrasonic exams performed in the second 10 year ISI interval have been performed using the appropriate calibration blocks.

(4.B) CP&L has initiated procurement of a replacement 8" Schedule 160 calibration block. The five welds in question have been scheduled for i re-examination using this replacement block during the next refueling  !

outage.

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