ML14184B047

Informs That Licensee 920629 Submittal Providing Summary of Results of EDG Static & Dynamic Analyses (Calculation RNP-8.016) Sufficient to Perform Intended Function

ML14184B047
Person / Time
Site:	Robinson
Issue date:	04/02/1993
From:	Mozafari B Office of Nuclear Reactor Regulation
To:	Watson R CAROLINA POWER & LIGHT CO.
References
TAC-M84940, NUDOCS 9304080187
Download: ML14184B047 (3)

Text

pjk REG UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D.C. 20555-0001 April 2, 1993 Docket No. 50-261 Mr. R. A. Watson Senior Vice President Nuclear Generation Carolina Power & Light Company Post Office Box 1551 Raleigh, North Carolina 27602

SUBJECT:

H. B. ROBINSON STEAM ELECTRIC PLANT, UNIT NO. 2 - REVIEW OF THE EMERGENCY DIESEL GENERATOR LOAD STUDY RESULTS (TAC NO. M84940)

The electrical Safety System Functional Inspection (SSFI) was performed at H. B. Robinson Steam Electric Plant, Unit No. 2 (HBR), in 1987. The SSFI team report identified a lack of documentation and engineering analyses to support the position that the emergency diesel generators (EDGs) have sufficient capacity and capability to perform their intended function. The staff has learned the Carolina Power & Light Company (CP&L) was reassessing EDG adequacy as a part of the electrical design basis reconstitution (DBR) effort. NRC, by letter dated October 31, 1988, requested that CP&L provide the results of their study to the staff when it was completed.

By letter dated June 29, 1992, the licensee submitted a summary of the results of the EDG static and dynamic analyses (Calculation RNP-8.016) which demonstrates that adequate EDG capacity is available for supplying the emergency loads under the worst case condition and that adequate bus and equipment voltages are maintained during motor starting transients.

The NRC has reviewed the submittal and finds that each EDG's maximum loading is within its continuous and short time ratings. Further, all bus transient voltages are maintained at or above minimum allowed values to ensure that running motors do not stall and energized contactors do not drop out, and that all of the motors on the safety buses receive sufficient voltage to accelerate their driven loads.

Based on our review of the licensee's submittal, we concur with the licensee that the EDGs have sufficient capacity and capability to perform their intended function. Therefore, we conclude that the concern about HBR's lack 9304008 93040;i 500 oo, NC FILE CENTER CP F

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-2 of documentation and analyses has been resolved. We also understand that those analyses will be modified and documented as a part of the electrical DBR effort when future plant modifications are made.

This completes our effort on TAC No. M84940.

Sincerely, Original signed by:

Brenda L. Mozafari, Project Manager Project Directorate II-1 Division of Reactor Projects -

I/II Office of Nuclear Reactor Regulation cc:

See next page DISTRIBUTION:

NRC/Local PDRs PD II-1 Reading File G. Lainas J. Mitchell B. Mozafari P. Anderson J. Richardson P. Kang C. Berlinger ACRS (10)

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-/93 Document Name:

ROB84940.LTR

H. B. Robinson Steam Electric Carolina Power & Light Company Plant, Unit No. 2 cc:

Mr. H. Ray Starling Mr. Dayne H. Brown, Director Manager -

Legal Department Department of Environmental, Carolina Power & Light Company Health and Natural Resources Post Office Box 1551 Division of Radiation Protection Raleigh, North Carolina 27602 Post Office Box 27687 Raleigh, North Carolina 27611-7687 Mr. H. A. Cole Special Deputy Attorney General Mr. Robert P. Gruber State of North Carolina Executive Director Post Office Box 629 Public Staff -

NCUC Raleigh, North Carolina 27602 Post Office Box 29520 Raleigh, North Carolina 27626-0520 U.S. Nuclear Regulatory Commission Resident Inspector's Office Mr. C. R. Dietz H. B. Robinson Steam Electric Plant Vice President Route 5, Box 413 Robinson Nuclear Department Hartsville, South Carolina 29550 H. B. Robinson Steam Electric Post Office Box 790 Regional Administrator, Region II Hartsville, South Carolina 29550 U.S. Nuclear Regulatory Commission 101 Marietta St., N.W., Ste. 2900 Mr. Heyward G. Shealy, Chief Atlanta, Georgia 30323 Bureau of Radiological Health South Carolina Department of Mr. Ray H. Chambers, Jr.

and Environmental Control Health General Manager 2600 Bull Street H. B. Robinson Steam Electric Plant Columbia, South Carolina 29201 Post Office Box 790 Hartsville, South Carolina 29550 Mr. R. B. Star-key Public Service Commission Vice President State of South Carolina Nuclear Services Department Post Office Drawer 11649 Carolina Power & Light Company Columbia, South Carolina 29211 Post Office Box 1551 Raleigh, North Carolina 27602 Mr. R. A. Watson Senior Vice President Nuclear Generation Carolina Power & Light Company Post Office Box 1551 Raleigh, North Carolina 27602