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Forwards Supplementary Response to IE Bulletin 79-15 Deep Draft Pump Deficiencies. Pumps Will Be Able to Perform in Accident Situation or Inability to Perform Will Be Detected & Corrected Per Tech Specs
	ML20010H343
Person / Time
Site:	Browns Ferry
Issue date:	08/26/1981
From:	Mills L; TENNESSEE VALLEY AUTHORITY
To:	James O'Reilly; NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
References
	IEB-79-15, NUDOCS 8109240365
	Download: ML20010H343 (5)
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t TENNESSEE VALLEY AUTHORITY J l a f. 6 : s.', *y_.

CHATTANOOGA. TENNESSEE!37401 400 Chestnut Street Tower II P l

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Mr. Jamen P. O'Reilly, Director g

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Dear Mr. O'Reilly:

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[l'n OFFICE OF INSPECTION AND ENFORCEMENT BULLETIN 79 RII:JPO

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50-259, - 260, -296 - BROWNS FERRY NUCLEAR PLANT - SUPPLEMENTAL

RESPONSE

Our initial response to the subject bulletin was submitteJ on September 10,.1979.

As discussed with F. Cantrell and 2. Kellogg of your staff on July 16, 1981, we are enclosing additior.a1 information on the operating histories of the deep draf t pumps in use at Browns Ferry.

If you have any questions, please call Jim Domer at FTS -

857-2014.

To the best of my knowledge, I declare the statements contained herein are complete and true.

Very truly yours, ENNESSEE VALLEY AUTHORITY

. M. Mills, Mahager Nuclear Regulation and Safety Enclosure cc (Enclosure):

Mr. Victor Stello, Director Office of Inspection and Enforcement U.S. Nuclear Regulatory Commission Washington, Do 20555 Director of the Division of Operat '.ng Reactors hIf Office of Nuclear Reactor Regulation U.S. Nuclear Regulatory Commission Washington, DC 20555

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An Equal Opportunity Employer

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es ENCLOSURE OFFICE OF INSPECTIO'! AND ENFORCEMENT BULLETIN 79-15 fiII:JPG 50-250, 6

-2 0, -206 BROWS FERRY MUCLEAR PLANT SUPPLFENTAL RESPONSE

References:

Browns Ferry FSAR, section 4.8, 10.o, and 10.10 Browns Ferry Technical Specifications sections 3.5.B, 3.5.C, 4.5.B, and 4.5.C As stated in our previous response to the bulletin, there is considerable redundancy and flexibility built into the Browns Ferry RHRSW/EECW aystems. For this reason it is difficult to obtain exact assigned system run times on each pumo individua11v.

However, routine requirements such as one pump per header for EECW, RHRSW for shutdown cooling, and RHRSW for torus cooling, make the run time appaoximations listed in Attachment 1 possible.

It must be emphasized that these run times are considered conservative because they do not take into account any of the following:

(1) auto starts due to performance of the diesel generator and core spray tests required by technical specifications; (2) tests which require 2 EECW pumos to be aligned to one EECW header; (3) run times for required technical specification testing on all RHRSW pumps; and (4) run time accumulated on the pumps before January 1, 1977 (this date was picked i

tecause the RHRSW pump run time documentation is sketchy before this date).

l For this same period as the run time accumulation (January 1, 1977 to July 31, 1981) the major maintenance history for the RHASW/EECW pumps has been compiled in Atta:hment 2.

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It can be seen from the above information that the 12 deep draft pumps at Browns Ferry have consicerable operating tima even when conservatively approximated. Since these pumps are identical and no general preference is given as to which pump is used within their normally assigned system, consideration of the collective pump operating experience indicates that there is noproximately one maintenance period per punn vear of operation.

Mditionativ, these pump are required by technical specifications to be tested nonthly for total developed head, flowrate, motor current and vibration. The total developed head, flowrate, and vibration are compared to baseline values developed under the guidelines of Sect ion XI of the ASME Boiler and Pressure Vessel Code. The vibration data on these pumps has been expanded to other plant instructions to cover additional vibration surveillance points on the onmp as well as periodic vibration spectrum analysis. With these testing requirements and tne relative 1v infrequent incidence of maintenance, we believe that these pumps will be able to perform their function in an accident situation or that their inability to perform their function will be detected and corrected in accordance with the provisions of the technical specifications.

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ATTACIDIENT 1 PUMP OPERATING TIME J

RllRSW P!DfPS (1-1-77 to 7-31-81)

Al and A2 "536.78 hours9.027778e-4 days 0.0217 hours 1.289683e-4 weeks 2.9679e-5 months .

El and B2 6355.64 hours7.407407e-4 days 0.0178 hours 1.058201e-4 weeks 2.4352e-5 months C1 and C2 4789.88 hours0.00102 days 0.0244 hours 1.455026e-4 weeks 3.3484e-5 months

. D1 and D2 5110.40 hours4.62963e-4 days 0.0111 hours 6.613757e-5 weeks 1.522e-5 months e

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(1-1-77 to 7-31-81)

' A3 20,076 hours8.796296e-4 days 0.0211 hours 1.256614e-4 weeks 2.8918e-5 months B3 20,076 hours8.796296e-4 days 0.0211 hours 1.256614e-4 weeks 2.8918e-5 months f

C3 20,076 hours8.796296e-4 days 0.0211 hours 1.256614e-4 weeks 2.8918e-5 months 4

D3 20,076 hours8.796296e-4 days 0.0211 hours 1.256614e-4 weeks 2.8918e-5 months 3

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(1)These run times were determined from inservice times of RHR heat exchangers and, therfore, cannot be attributed to number 1 or number 2 pump individually.

1 (2)These run times are based on running at least one EECW pump per header at all times since Janu,.iry 1, 1977. There is generally no preference given as'to l _

which pumps are running at any particular time. Rather, it is usually dependent l

on completed or impending technical specification testing. Therefore, attributing 50% run time to each pump on a given header is not unreasonable.

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(1-1-77 f:o 7-31-81)

(1) Readjusted the coupling spacing on B1 pump.-

(2) Replace the Al pump.

(3)( ) Rebuilt the Al pump twice and the B1 -*sp three times.

1 (4)

Replaced cracked suction bell on the Al pump.

(5) Replaced a shaft section on B1 pump.

(6)

Replaced a broken coupling on the C2 pump.

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(1)( ) Rebuilt the A3 ar.d C3 pumps twice.

(2) Replaced bottom bearings on the D3 pump.

(3) Replaced broken shaf't on the A3 pump and realigned pump and motor (this includes one of the A3 pun;p rebuilda listed above).

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(A) Normal maintenance to these pumps as packing adjustment and replacement and suction strainer repair and replacement are not included in thesc I

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l (B) Rebuilding includes any or all of the following: now wear rings, new L

I 0-rings, new bottom bushings, new bearings, and new impellers),

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ML20010H343

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