ML19294C274

Supplements Response to IE Bulletin 80-01.Compressors Noted in Original Response Are Emergency Standby Compressors. Noninterruptable Instrument Air Sys Consists of Sys Which Supply Air to safety-related Equipment in Reactor Bldg

ML19294C274
Person / Time
Site:	Brunswick
Issue date:	02/14/1980
From:	Furr B CAROLINA POWER & LIGHT CO.
To:	James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
References
IEB-80-01, IEB-80-1, NUDOCS 8003100026
Download: ML19294C274 (3)

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FILE: NG-3513 (B)

SER M-80-206 Mr. James P. O'Reilly, Director U. S. Nuclear Regulatory Commission Region II 101 Marietta Street, Suite 3100 Atlanta, GA 30303 BRUNSWICK STEAM ELECTRIC PLANT, UNIT NOS.1 & 2 LICENSE NOS. DPR-71 AND DPR-62 DOCKET Nos. 50-325 AND 50-324 SUPPLEMENTAL RESPONSE TO IE BULLETIN 80-01

Dear Mr. O'Reilly:

In response to a request for clarification of several items contained in our initial response to IE Bulletin 80-01 by Mr. A. K.

Hardin of your staf f, we submit the following information.

The compressors referred to in the original response are our emergency standby compressors and not our three station compressors.

The Non-Interruptible Instrument Air (IAN) System consists of dual, independent, and seismic-analyzed systems which supply air to safety-related equipment in the Reactor Building.

During normal operation, non-interruptible instrument air (IAN) is supplied from our three station air comprer. sors in the main instrument air system through double spring check valves. A 96 cubic-foot air receiver is connected to each division of the IAN System. If the IAN System pressure drops below 95 psig, the independent emergency standby compressors are automatically started to maintain the IAN System pressure to >95 psig. The emergency standby compressors also feed the same 96 cubic-foot air receivers through spring check valves.

Periodic Test PT-31.3 is performed at refueling intervals to verify proper performance of these compressors.

Each ADS valve accumulator is connected to both divisions of the IAN System through spring check valves.

Each of the IAN System divisions are seismically analyzed, including the emergency standby compressors and receivers. These compressors are powered from our emergency bus and receive power from the Diesel Generatoes during a loss of off-site power.

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411 Fayetteville Street e P. O. Box 1551

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Mr. James P. O'Reilly February 14, 1980 Periodic Test PT-31.5 is performed on the ADS accumulator check valves each 92 days during a shutdown. During this test, one division of IAN feeding the ADS valves is isolated and vented. The operator verifies that the check valves in the division of IAN vented do not allow the other division, which is still pressurized, to leak through.

This verification is performed by the operator placing his hand over the vent line and verifying that no detectable leakage is present.

This test checks all seven check valves on one division at one time.

The test is repeated for the other division of the I AN System. The PT has been pe rfo rmed several times on each unit with satisf actory results each time.

As mentioned previously, Maintenance Instruction (M.I. 10-504B) also requires the disassembly and inspection of 85% of the accumulator check valves each refueling cycle.

Therefore, our air supply for the ADS valve accumulators is sufficiently redundant and tested to prevent any single failure from rendering the ADS valves inoperable as set forth in the FSAR.

As discussed by telephone recently, at our next refuelings we will perform a test sufficient to demonstrate that the ADS check valves / accumulators are capable of performing their intended function.

We trust that this information satisfies your concerns with our initial response.

Yours very truly, N

J. Furr Vice President Nuclear Operations RMP/CSB/klb*

Attachment cc:

Mr. N. C. Mcseley

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