ML14191A342
| ML14191A342 | |
| Person / Time | |
|---|---|
| Site: | Robinson  |
| Issue date: | 06/30/1988 |
| From: | Lo R Office of Nuclear Reactor Regulation |
| To: | Utley E Carolina Power & Light Co |
| References | |
| TAC-67822 NUDOCS 8807060504 | |
| Download: ML14191A342 (3) | |
Text
DISTRIBUTION Docket File NRC PDR Docket No. 50-261 Local PDR PD21 r/f S. Varga (14E4)
Mr. E. E. Utley G. Lainas Senior Executive Vice President E. Adensam Power Supply and Engineering & Construction P. Anderson Carolina Power & Light Company R. Lo Post Office Box 1551 OGC Raleigh, North Carolina 27602 E. Jordan (MNBB 3302)
B. Grimes (9A2)
Dear Mr. Utley:
P. Kang (8020)
ACRS (10)
SUBJECT:
REQUEST FOR ADDITIONAL INFORMATION -
EVALUATION OF THE ADEQUACY OF THE STATION ELECTRIC DISTRIBUTION SYSTEM VOLTAGES, H. B. ROBINSON STEAM ELECTRIC PLANT, UNIT NO. 2 (TAC NO. 67822)
References:
March 29, 1988 letter from L. I. Loflin (CP&L) to NRC.
January 13, 1988 letter from K. T. Eccleston (NRC) to E. E.
Utley (CP&L).
Your letter dated March 29, 1988 provides information on the adequacy of the "Station Electric Distribution System Voltages (MPA B-48)," H. B. Robinson Steam Electric Plant, Unit No. 2. Our review of this response to our earlier request for information concludes that further information is needed. In order for us to complete the assessment of the impact of the electrical system changes in regard to conformance to the staff's Branch Technical Position, PSB-1, we request that CP&L provide the additional information described in the Enclosure. Further, we request that the additional information be provided within 30 days of receipt of this letter.
The reporting and/or recordkeeping requirements contained in this letter affect fewer than ten respondents; therefore, OMB clearance is not required pursuant to Public Law 96-511.
Sincerely, 6807060504 880630 PDR ADOCK 05000261 Ronnie H. Lo, Senior Project Manager Project Directorate li-1 Division of Reactor Projects I/II
Enclosure:
Request for Additional Information cc w/enclosure:
See next page OFC
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NAME : PA 9
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EA am DATE 6/,a'/88
- 6/2 88 6 /88 OFFICIAL RECORD COPY
Mr. E. E. Utley Carolina Power & Light Company H. B. Robinson 2 cc:
Mr. R. E. Jones, General Counsel Mr. Owayne H. Brown, Chief Carolina Power & Light Company Radiation Protection Branch P. 0. Box 1551 Division of Facility Services Raleigh, North Carolina 27602 Department of Human Resources 701 Barbour Drive Raleigh, North Carolina 27603-2008 Mr. McCuen Morrell, Chairman Darlington County Board of Supervisors Mr. Robert P. Gruber County Courthouse Executive Director Oarlington, South Carolina 29535 Public Staff - NCUC P.O. Box 29520 Mr. H. A. Cole Raleigh, North Carolina 27626-0520 Special Deputy Attorney General State of North Carolina P.O. Box 629 Raleigh, North Carolina 27602 Mr. D. E. Hollar Associate General Counsel Carolina Power and Light Company P.O. Box 1551 Raleigh, North Carolina 27602 U.S. Nuclear Regulatory Commission Resident Inspector's Office H. B. Robinson Steam Electric Plant Route 5, Box 413 Hartsville, South Carolina 29550 Regional Administrator, Region II U.S. Nuclear Regulatory Commission 101 Marietta Street Suite 3100 Atlanta, Georgia 30323 Mr. R. Morgan General Manager H. B. Robinson Steam Electric Plant Post Office Box 790 Hartsville, South Carolina 29550 Mr. Avery Upchurch, Chairman Triangle J Council of Governments 100 Park Drive Post Office Box 12276 Research Triangle Park, NC 27709
REQUEST FOR ADDITIONAL INFORMATION THE ADEQUACY OF THE STATION ELECTRIC DISTRIBUTION SYSTEM VOLTAGES H. B. ROBINSON STEAM ELECTRIC STATION, UNIT NO. 2 DOCKET NO. 50-261 H. B. Robinson Unit 2's electrical system has undergone significant load and configuration changes. A new prcgram is being used to analyze the system, and the anticipated offsite system voltage extremes being considered differ significantly from those used in the previous voltage study. Therefore, it is deemed necessary to reassess the adequacy of the station electrical distri bution voltages to ensure their continueo conformance with staff position PSB-1.
The following additional information is required for this evaluation.
- 1. In LER (86-5), which was provided to report the Loss of Offsite AC event that occurred on january 28, 1986, it was stated that "Auxiliary load at Robinson has slowly increased over the years due to backfit modifica tions."
However, the liCenSEe's 50.59 evaluation dated November 11, 1985, (M-860-2) addressed only the addition of two new Station Service Trans formers (SST 2F & 2G).
We request CP&L to identify all the equipment added since the last voltage study (1982) and to provide the documentation describing how the additions of load (such as SST-2E, Bus No. 5, and MCC
- 17) would affect the overall station distribution system voltage.
CP&L should provide analysis to show that the present Robinson electrical system satisfies the station electrical distribution system voltage adequacy as required by Branch Technical Position PSB-1.
- 2.
We have been advised that CP&L no longer uses the EBASCO computer program which was used in the previous voltage study and validated through PSB-1.
Since a new program (Dynamic C) has been substituted, we believe that a validation of the computer program is necessary to demonstrate the two programs are equivalent and that the new program is adequate.
We under stand that the new program has been used extensively during the recent onsite distribution system modifications; theretore, CP&L should provide the program validation.
- 3. The original voltage (MPA-B48) study that was reviewed by the staff was performed based on the voltage extremes of 0.97 to 1.01 per unit. How ever, the voltage extremes used in the latest submittal are 1.013 and 1.022.
No justification or basis for this narrowed voltage range has been given. The intent of the PSB-1 study was to assess the onsite system based on the worst case expected offsite system voltages.
The study is not to be based on the scheduled voltages.
Therefore, provide justifica tion for the new voltage limits or perform the study based on the previous voltage extremes.