ML20137B899
| ML20137B899 | |
| Person / Time | |
|---|---|
| Site: | Brunswick  |
| Issue date: | 08/12/1985 |
| From: | Cutter A CAROLINA POWER & LIGHT CO. |
| To: | Vassallo D Office of Nuclear Reactor Regulation |
| Shared Package | |
| ML20137B905 | List: |
| References | |
| NLS-85-069, NLS-85-69, NUDOCS 8508220170 | |
| Download: ML20137B899 (3) | |
Text
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CD&L Carolina Power & Light Company SERIAL: NLS-85-069 AUG 121985 Director of Nuclear Reactor Regulation Attention:
Mr. D. B. Vassallo, Chief Operating Reactors Branch No. 2 Division of Licensing United States Nuclear Regulatory Commission Washington, DC 20555
. BRUNSWICK STEAM ELECTRIC PLANT, UNIT NOS.1 AND 2 DOCKET NOS. 50-325 & 50-324/ LICENSE NOS. DPR-71 & DPR-62 REQUEST FOR LICENSE AMENDMENT RHR/ SUPPRESSION POOL-COOLING MODE
Dear Mr. Vassallo:
SUMMARY
In accordance wit.h the Code of Federal Regulations, Title 10, Parts 50.90 and 2.101, Carolina Power & Light Company (CP&L) hereby requests a revision to the Technical Specifications (TS) for the Brunswick Steam Electric Plant, Unit Nos. I and 2.
The
. proposed amendment revises the surveillance requirements for the suppression pool
. cooling mode of the Residual Heat Removal (RHR) System.
DISCUSSION The surveillance requirements for the suppression pool cooling mode of the RHR system, TS 4.6.2.2.b, currently require verification "that each RHR pump can be started from the control room and develops a flow of at least 10,300 gpm against a system head corresponding to a reactor pressure of greater than or equal to 20 psig on recirculation flow."
The current surveillance requirement is modeled after an In-Service Inspection requirement for a full-flow test. The system is tested during normal plant operation by taking suction from the suppression pool and returning the water to the pool through a test line.
Each pump must develop a. flow of.10,300 gpm to satisfy the test requirement. The RHR heat exchanger must be bypassed during this test as flow through the RHR heat exchanger is limited to 7,700 gpm to prevent damage to' the heat exchanger tubing.
A more accurate method of verifying operability of the RHR pumps in the suppression pool cooling mode is to route the recirculation flow through the RHR heat exchanger (as in actual operation). Since the flow path in this mode of operation is from the torus, through the RHR heat exchanger, and then back to the torus, any system pressure g
requirement is irrelevant.
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Mr. D. B. Vassallo NLS-85-069/Page 2 Therefore, the proposed TS requires that each RHR pump produces a recirculation flow of at least 7,700 gpm through the RHR heat exchanger to the suppression pool. The proposed TS follows the guidance provided by the GE BWR/4 Standard Technical Specifications (STS) by routing flow through the RHR heat exchanger during the surveillance test.
SIGNIFICANT HAZARDS ANALYSIS The Commission has provided standards for determining whether a significant hazards consideration exists (10 CFR 50.92(c)). A proposed amendment to an operating license for a facility involves no significant hazards consideration if operation of the facility in accordance with the proposed amendment wculd not: (1) involve a significant increase in the probability or consequences of an accident previously evaluated; (2) create the possibility of a new or different kind of accident from any accident previously evaluated; or (3) involve a significant reduction in a margin of safety. Carolina Power & Light Company has determined that the requested amendment per 10 CFR 50.92:
(1)
Does not involve a significant increase in the probability or consequences of an accident previously evaluated because the proposed amendment only modifies the surveillance requirement. No changes are made to the design, function, operating parameters, operating procedures or setpoints to any plant system.
(2)
Does not create the possibility of a new or different kind of accident than previously evaluated for the same reasons as already given in item (1) above.
(3)
Does not involve a significant reduction in a margin of safety.
The proposed surveillance requirement provides a better indication of actual system performance by including the RHR heat exchanger in the test loop. The modified requirement is j
more consistent with the guidance provided in the GE STS. Also, the requirements of the~ surveillance are more clearly stated. The margin of safety, therefore, is maintained.
l Based on the above, CP&L has determined that the proposed amendment meets the criteria of 10 CFR 50.92(c) and, therefore, does not involve significant hazards consideration.
ADMINISTRATIVE INFORMATION The proposed Brunswick-1 and Brunswick-2 TS pages are provided in Enclosures 1 and 2.
Carolina Power & Light Company has evaluated this request in accordance with the provisions of 10CFR170.12 and has determined that an application fee is required. A check for $150.00 is enclosed in payment of this fee.
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Mr. D. B. Vassallo NLS-85-069/Page 3 -
Please refer any questions concerning this submittal to Mr. Sherwood R. Zimmerman at (919) 836-6242.
Yours very tru y,
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A. B. Cutter - Vice President Nuclecr Engineering & Licensing GB/crs (1207NLU)
Enclosures cc:
Dr. J. Nelson Grace (NRC-Ril) s Mr. R. H. Ruland (NRC-BNP)
Mr. M. Grotenhuis (NRC)
Mr. Dayne H. Brown i
A. B. Cutter, having been first duly sworn, did depose and say that the information contained herein is true and correct to the best of his information, knowledge and belief; and the sources of his information are officers, employees, contractors, and agents of Carolina Power & Light Company.
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