ML20154F988

Provides Confirmation Requested in Generic Ltr 88-03 Re Resolution of Generic Issue 93, Steam Binding of Auxiliary Feedwater Pumps by Perpetuating Recommendations of IE Bulletin 85-001

ML20154F988
Person / Time
Site:	Three Mile Island
Issue date:	05/16/1988
From:	Hukill H GENERAL PUBLIC UTILITIES CORP.
To:	NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM)
References
REF-GTECI-093, REF-GTECI-NI, TASK-093, TASK-OR GL-88-03, IEB-85-001, NUDOCS 8805240160
Download: ML20154F988 (2)

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• Middletown, Pennsylvania 17057 0191 717 944 7621 TELEX 84 2386 Writer's Direct Olal Nurnbor:

C311-88-2053 May 16, 1988 U. S. Nuclear Regulatory Commission Attn: Document Control Desk Washington, DC 20555

Dear Sir:

Three Mile Island Nuclear Station, Unit 1 (TMI-1)

Operating Licensing No. DPR-50 Docket No. 50-289 GPUN Response to Generic Letter (GL) 88-03 The purpose of this letter is to provide the confirmation requested in GL 88-03. The stated purpose of GL 88-03, dated February 17, 1988 is to resolve Generic Issue 93 "Steam Binding of Auxiliary Feedwater Pumps" by perpetuating the recommendations of IE Bulletin 85-01. In particular, it was stated that all addressees should:

1. Maintain procedures to monitor fluid conditions within the AFW system each shift during times when the system is required to be operable. This monitoring should ensure that fluid temperature at the AFW pump discharge is maintained at about ambient levels.

2. Maintain procedures f or recogni::ing steam binding and for restoring the AFW system to operable status, should steam binding occur.

All addressees were requested to provide a letter of confirmation to the NRC indicating that the procedures discussed in GL 88-03 are in place and will be maintained.

GPUN's response to IE Bulletin 85-01, dated February, 27, 1986 (attached) describes TMI-l procedures which accomplish the purposes requested in 1 and 2 above. As of this date, those measures as described in our letter are still in effect and no temperature increase above ambient has been noted. These procedures will be maintained; however it should be noted that they are subject to 10 CFR 50.59 changes if necessary.

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GPU Nuclear Corsoration is a subsidiarn of the General Public Utilities Corsoration

C311-88-2053 May 16, 1988 Initial training was described in our earlier response. Training program materials are currently being upgraded to ensure adequate coverage of this condition and restoration from it. This response is being submitted in accordance with 10 CFR 50.54(f).

Sincerely,

}. 0 H. b. Huki 1 f lA W Vice President and Director, TMI-l HDH/MRK cc: J. Stolz R. Hernan R. Conte W. Russell Attachment sworn and subscribed to before me this /6N day of GT/4,j , 1988.

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GPU Nuclear Corporation Nuclear =e ra's" Middletown, Pennsylvania 17057 0191 717 944 7621 TELEX 84 2386 Writer's Direct Dial Numt:er:

February 27, 1986 5211-86-2034 Dr. Thoms E. Murley Region I, Regional Administrator U.S. Nuclear Regulatcry Commission 631 Park Avenue King of Prussia, PA 19406

Dear Dr. Murley:

Three Mile Island Nuclear Station, Unit 1 (THI-1)

Operating License No. OPR-50 Docket No. 50-289 Response to IE Bulletin 85-01 This is in response to IE Bulletin 85-01 entitled "Steam Binding of Auxiliary Feedwater Pumps." The system at THI-1 which corresponds to the system described in the bulletin is the Emergency Feedwater System (EFW). The TMI-1 EFW system is required for certain transients and accident mitigation. The EFW system is not required and not used for noral shutdown or cooldown as described in the bulletin for AFW (page 2, first paragraph). TMI-l 's EFW system is not cross-connected with the Main Feedwater System. Therefore, steam bir. ding caused by leakage from main feedwater is not possible.

THI-l's EFW system uses a nore11y closed control valve (EF-V30A/B). In l addition, the line between the two Once Through Steam Generators (OTSGs) and each of the three EFW pumps are providad with two check valves (EF-Vil A/B, EF-V12A/B, and EF-V13) in series. Triple isolation valves mke a steam binding f ailure highly unlikely. The measures listed below assure timely detection and corrective action if the event should occur.

The following is in response to the action items of the bulletin:

1. Develop precedures for monitoring fluid conditions within the EFW systen on a regular basis during times when the system is required to be operable.

The Secondary Auxiliary Operator's Log Sheets require monitoring the temperature of the pipe upstream of each EFW punp discharge check valve on each shif t. Temperature monitoring / recording has been in effect for the last several nonths with no increase above anbient temperature noted.

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GPU Nuqsar corporation is a subsidiary of the General Public Utilities Corporation

5211-86-2034 Training was initiated on July 5,1985 by memo 3210-85-0274 "Training Handout - Detection of Vapor Binding in EFW Pumps." This handout describes the potential for steam binding of the pumps and the monitoring requirements. Shif t supervisors, foremen, and crew briefing was completed on July 31, 1985.

2. Develop procedures for recognizing steam binding and restoring EFW, should steam binding occu.a.

Revision 42 to OP-1106-6 (EFW Operating Procedure) addresses restoration of EFW if steam binding were to occur. This revision, distributed on Ja nuary 20, 1986, requires securing the affected pumps and draining cool condensate storage tank water through the pun to a pu@ discharge vent valve if pipe temperature indicates that steam binding would occur.

This cor@1etes GPUN's response to IE Bulletin 85-01. This letter is being submitted one day late as discussed with the NRC Senior Resident inspector R. Conte on February 26, 1986.

Si nce rely,

. D. I ill Director, THI-1 HDH/MRK/spb:0504A cc: R. Conte J. Thoma Document Control Desk (Original) i Sworn and suberibed to before me this 27th day of February , 1986.

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