ML20214E136
| ML20214E136 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 02/27/1986 |
| From: | Hukill H GENERAL PUBLIC UTILITIES CORP. |
| To: | Murley T NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| References | |
| 5211-86-2034, IEB-85-001, IEB-85-1, NUDOCS 8603070142 | |
| Download: ML20214E136 (2) | |
Text
y GPU Nuclear Corporation Nuclear
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Middletown, Pennsylvania 17057 0191 717 944 7621 TELEX 84 2386 Writer's Direct Dial Number:
February 27, 1986 5211-86-2034 Or. Thomas E. Murley Region I, Regional Administrator U.S. Nuclear Regulatory Commission 631 Park Avenue King of Prussia, PA 19406
Dear Dr. Murley:
Three Mile Island Nuclear Station, Unit 1 (TMI-1)
Operating License No. DPR-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-l which corresponds to the system described in the bulletin is the Emergency Feedwater System (EFW). The TMI-l EFW system is required for certain transients and accident mitigation. The EFW system is not required and not used for normal 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 binding caused by leakage from main feedwater is not possible.
TMI-l's EFW system uses a normally closed control valve (EF-V30A/B).
In addition, the line between the two Once Through Steam Generators (OTSGs) and each of the three EFW pumps are provided with two check valves (EF-Vll A/D, EF-V12A/B, and EF-V13) in series.
Triple isolation valves make a steam binding failure 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 procedures for monitoring fluid conditions within the EFW systen on a regular basis during times when the system is required to be opera bl e.
The Secondary Auxiliary Operator's Log Sheets require monitoring the temperature of the pipe upstream of each EFW pump discharge check valve on each shift. Temperature monitoring / recording has been in effect for the last several months with no increase above ambient temperature noted.
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GPU Nuclear Corporation is a subsidiary of the General Public Utilities Corporation
e 5211-86-20?4 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 i
was completed on July 31, 1985.
2.
Develop procedures for recognizing steam binding and restoring EFW, should steam binding occur.
Revision 42 to OP-1106-6 (EFW Operating Procedure) addresses restoration of EFW if steam binding were to occur. This revision, distributed on January 20, 1986, requires securing the affected pumps and draining cool condensate storage tank water through the pump to a pug discharge vent valve if pipe temperature indicates that steam binding would occur.
This completes 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.
Sincerely,
. D. I ill Director, TMI-l HDH/HRK/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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