ML20140E506

Requests Relief from ASME Code Requirements to Perform Full Volumetric Ultrasonic Test of HPCI Pump Studs.Ultrasonic Exams Will Be Completed During Next Refueling Outage Scheduled to Begin in Jan 1988.Fee Paid

ML20140E506
Person / Time
Site:	Brunswick
Issue date:	03/25/1986
From:	Cutter A CAROLINA POWER & LIGHT CO.
To:	Muller D Office of Nuclear Reactor Regulation
References
NLS-86-090, NUDOCS 8603280018
Download: ML20140E506 (3)

Text

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CD&L Carolina Power & Light Company MAR 'S 51986 SERIAL: NLS-86-090 Director of Nuclear Reactor Regulation Attention: Mr. Dan Muller, Director BWR Project Directorate #2 Division of BWR Licensing United States Nuclear Regulatory Commission Washington, DC 20555 BRUNSWICK STEAM ELECTRIC PLANT, UNIT NO. 2 DOCKET NO. 50-324/ LICENSE NO. DPR-62 ASME CODE RELIEF REQUEST HPCI PUMP STUDS

SUMMARY

Carolina Power & Light Company (CP&L) is currently performing the 10-year in-service inspection (151) on Brunswick-2. Table IWC-2500-1 of Section XI of the ASME Code requires a full-volumetric ultrasonic test of the high pressure coolant injection (HPCI) pump studs. Completion of the required ultrasonic testing during the current refueling outage is not feasible. Therefore, in accordance with the provisions of 10 CFR 50.55a, CP&L requests relief from the ASME Code requirements to perform this test during the 10-year in-service inspection outage. The required ultrasonic examinations will be completed during the next Brunswick-2 refueling outage currently scheduled to begin in January 1988.

DISCUSSION / HARDSHIP There are 17 HPCI pump r.tuds involved in this request. These studs connect the upper pump casing to the lower pump casing. A full-volumetric ultrasonic test of these~ studs requires removal of the stud cap nuts. Specialized equipment, not currently on site, is required to remove the stud cap nuts which are tensioned to 8,000 foot-pounds.

Rescheduling examination of the HPCI pump studs af ter this equipment could be ,

delivered to Brunswick would have a significant impact on the outage schedule. The required work scope increase would affect other critical path activities causing a delay in completion of the outage. In addition, expanding the current work scope would result in an increased man-rem exposure for tne outage. This is' inconsistent with the -

Company's'ALARA policies. .

ALTERNATE EXAMINATIONS  :

In lieu of the r.equired full-volumetric titrasonic. test on all 17 studs, CP&L has performed ansn-place ultfasonic examination of 9 studs. This examination encompassed approximately 80 percentsof the total. stud length. The stud cap nuts prevented ultrasonic examination from the top surface of the studs and the physical configuration of the pump prevented access to 8 of the 17 studs from the bottom surface. Figure 1 f provides the locations of the examined studs.. ,

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Mrs D:n Muller l NLS-86-090/Page 2 l

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The ultrasonic examination was performed using the cylindrically guided wave technique developed by EPRI. This examination is more sensitive to defects than conventional code techniques. No adverse indications were observed during the examination.

In addition, a visual (VT-2) inspection of the HPCI pump is performed at least once every 92 days during operation. This ensures timely detection of any significant degradation of the pump studs.

4 Finally, the required full-ultrasonic examinations will be performed during the next

-Brunswick-2 refueling outage.

CONCLUSION

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Carolina Power & Light Company believes that alternate testing proposed for the HPCI pump studs provides adequate assurance of pump integrity. The additional assurance of HPCI pump integrity resulting from a full-ultrasonic examination of the studs is outweighed by the hardships incurred in completing the examinations.

The Company has reviewed this request in accordance with the provisions of 10 CFR 170.12 and has determin.ed that an application fee is required. A check for $150 is enclosed in payment of this fee.

Please refer any questions regarding this matter to Mr. Sherwood R. Zimmerman at (919) 836-6242.

Your very t u ,

/M 4c m i A. B. Cutter - Vice President Nuclear Engineering & Licensing ABC/ MAT /ccc (3349 MAT)

Enclosures

• cc: Mr. W. H. Rutand (NRC-BNP)

Dr. J. Nelson Grace (NRC-RII)

Mr. M. Grotenhuis (NRC)

Mr. E. Sylvester (NRC) 4

• Enclosures with all cc's.

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