ML20086R867
| ML20086R867 | |
| Person / Time | |
|---|---|
| Site: | Brunswick  |
| Issue date: | 12/18/1991 |
| From: | Vaughn G CAROLINA POWER & LIGHT CO. |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| NLS-91-323, TAC-M81296, TAC-M81297, NUDOCS 9201020276 | |
| Download: ML20086R867 (2) | |
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4 CA&L Carouna Power & Light Company P O Enoa 1551 e Rai.igh, N C 27602 DEC 181991 G. E. VAUGHN
- u. pr.co.ni SE RI Al. N1.S 41323 No., somn.. o.p.nm.ni
)ggpg5g,qg FAC Nos/hl29h and 81207 United States Nuclear Regulatory Commission ATFENTION: Document Control Desk Washington, DC 20555 llRUNSWICK STEAM ELECTRIC PLAN I, UNIT NUS.1 AND 2 DOCKET NOS. 50 325 & 50-324/ LICENSE NOS. DPR-71 & DPR-62 RESPONSE TO NRC SLtPPLEMENTAL SAFETY EVAL UATION OF CP&L RESPONSE TO STATION HLACKOUT RULii Gentlemen:
The purpose of this letter is to respond to the NRC Supplemental Safety Evaluation of the 13runswick Steam Electric Plant (HSEP), Units I and 2, Response -to the Station 131ackout Rule. This supplemental safety evaluation (dated October 2,1991) requested that Carolina Power & Light Company (CP&L) establish procedural controls to cnsure that the control room temperature of 78" F used in the heat-up analysis would not he exceedcd Juring normal power operation, [and cause the 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> temperature after an SBO event to be above 120"F], and required CP&L to submit confirmation of the resolution of this issue and present a schedule for its implementation in accordance with 10 CFR 50.63(c)(4).
As noted on page 3, Section 2.2.3 of this supplemental safety evaluation, CP&L had performed an analysis which indicated the HSEP control room temperature would remain below 118" F after one hour following an SHO event. This analysis assumed an initial control room temperature of 78" F, which was consistent with the guidance provided in NUREG-0700, " Guidelines for Control Room Design Reviews", Section 6.1.5.1. The analysis also contained a degree of conseivatism since the intent was to provide reasonable assurance of the operability of equipment needed to cope with a station blackout. CP&L has performed an analysis of the initial control room temperature which removes some of that conservatism. This analysis demonstrates that the initialization temperature could actually be as high as d5"F and the one hour temperature still remain below the specified NtJMARC 87-00, Section 2.7 value of 120 F.
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I Carolina Power & Light Company will monitor cantrol room temperature to verify that the Control _ Room temperature is below 78"F. When the temperature is above 78"E increased trending will commence as well as trouble shooting. If the temperature reaches 85 F then trouble shooting activities will take place around the clock and corrective actions will be implemented if necessary, The temperature will be measured with the unit at normal power operation and with the ilVAC system operating normally I
as allowed by NUMARC 87 00 Assumption 2.2.1(2).
Carolina Power & Light Company has previously verified by direct obserwition that the llVAC system is capable of maintaining the control room less than or equal to 78" F under normal power operation. The purpose of monitoring the temperature in the future is to identify potential malfunctions of the control room IIVAC system.
Please refer any questions regarding this submittal to Mr. S. D. Floyd at (919) 53 6901.
Yours very truly,
/
G. E. Vaug m GEV/JCP (cr-sho-r.wpf) cc:
Mr. Dayne 1-1, Brown Mr. S D. Ebneter Mr. N. B. Le Mr. R. L. Prevatte
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