ML19261F363
| ML19261F363 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 06/01/1977 |
| From: | Herbein J METROPOLITAN EDISON CO. |
| To: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| References | |
| GQL-0757, GQL-757, NUDOCS 7910250825 | |
| Download: ML19261F363 (2) | |
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METROPOLITAN EDISON COMPANY :vasioisar or cc:.1?st pucticuri:.irits ccspacari:n !/
POST OFFICE BOX $42 READING, PENNSYLVANI A 19603 TE LEPHONE 215 - 929-3601 June 1, 1977 GQL 0757 Mr. J. P. O'Reilly, Director Office of Inspecticn & Enforcement, Regica I U.S. Nuclear Regulatory Commission 631 Park Avenue King of Prussia, Pa. 19h06
Dear Sir:
Three Mile Island Nuclear Station, Unit I Operating License No. LPR-50 Docket No.
50 ?89 On May 2, 1977, we received I E Bulletin No. (T-01 concerning pnaumatic time delay relay setpoint drift. Enclosed is our answer for Three Mile Island Nuclear Station, Unit I.
Sincerely,
~
J. G. Herbein Vice President JGH:njs cc:
U.S. Nuclear Regulatory Cc= mission Office of Inspection and Enforcement Division of Reactor Inspection Programs Washington, D.C.
20555 Enclosure 1482 10 s
7910250, n 6
There are no ITE Imperial J20T3/J13P20 or J20T3/J13P30 relays in use on safety related systems.
In addition, the pneu=atic time delay relays used for control purpcses have repeat accuracies of j; 105 cr better.
Pneumatic time delay relays with a repeat accuracy of f; 155 are used as the time delay for alarm functions. These rele.ys listed in table 1 have instan-taneous contacts which are used to open the pump discharge valve, start the discharge strainer, and start the lube water purp.
The time delay contact is only used for an alarm function.
Since no time delay contacts with repeat accuracies of + 15% or greater are used for centrol functions on safety related equipment, no further action is required.
Table 1 Relay Makej Repeat Time Delay Designatien Model Accuracy Function Screen Wash GE/
62/SWD2A & Sluice SysteaCR122A08322AA
+ 15%
Alarm Decay Heat Removal-62/DRDIAs river water Screen Wash &
62/SWD1A Sluice System Nuclear services cool-62/NRDIA ing - river water Nuclear Services cool-62/NRD13-R ing - river water Reactor building emere,-
62/RRDIA ency cooling-river water Screen Wash &
62/SWD23 Sluice System Decay Heat Removal-62/DRD13 river vater Screen Wash &
62/SWD13 Sluice System Secondary services 62/SRD13 cooline-river water Secondary services 62/SRDlC ecoling-river water Nuclear Services cool-.
62/NRDlC ing - river water Nuclear Services 62/NED13-T cooling-rive; wat;e:
Reactor building emersr y
p 62/KRDlB ency cocling-river water
" Instantaneous contacts are used to open discharge & start strainer.
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